diff --git a/SI7005_HTU21D/Makefile b/SI7005_HTU21D/Makefile
new file mode 100644
index 0000000..530d862
--- /dev/null
+++ b/SI7005_HTU21D/Makefile
@@ -0,0 +1,57 @@
+# run `make DEF=...` to add extra defines
+PROGRAM := sihtu
+LDFLAGS := -fdata-sections -ffunction-sections -Wl,--gc-sections -Wl,--discard-all
+LDFLAGS += -lusefull_macros -lm
+SRCS := $(wildcard *.c)
+DEFINES := $(DEF) -D_GNU_SOURCE -D_XOPEN_SOURCE=1111
+OBJDIR := mk
+CFLAGS += -O2 -Wall -Wextra -Wno-trampolines -std=gnu99
+OBJS := $(addprefix $(OBJDIR)/, $(SRCS:%.c=%.o))
+DEPS := $(OBJS:.o=.d)
+TARGFILE := $(OBJDIR)/TARGET
+CC = gcc
+#TARGET := RELEASE
+
+ifeq ($(shell test -e $(TARGFILE) && echo -n yes),yes)
+	TARGET := $(file < $(TARGFILE))
+else
+	TARGET := RELEASE
+endif
+
+ifeq ($(TARGET), DEBUG)
+	.DEFAULT_GOAL := debug
+endif
+
+release: $(PROGRAM)
+
+debug: CFLAGS += -DEBUG -Werror
+debug: TARGET := DEBUG
+debug: $(PROGRAM)
+
+$(TARGFILE): $(OBJDIR)
+	@echo -e "\t\tTARGET: $(TARGET)"
+	@echo "$(TARGET)" > $(TARGFILE)
+
+$(PROGRAM) : $(TARGFILE) $(OBJS)
+	@echo -e "\t\tLD $(PROGRAM)"
+	$(CC) $(OBJS) $(LDFLAGS) -o $(PROGRAM)
+
+$(OBJDIR):
+	@mkdir $(OBJDIR)
+
+ifneq ($(MAKECMDGOALS),clean)
+-include $(DEPS)
+endif
+
+$(OBJDIR)/%.o: %.c
+	@echo -e "\t\tCC $<"
+	$(CC) $< -MD -c $(LDFLAGS) $(CFLAGS) $(DEFINES) -o $@ 
+
+clean:
+	@echo -e "\t\tCLEAN"
+	@rm -rf $(OBJDIR) 2>/dev/null || true
+
+xclean: clean
+	@rm -f $(PROGRAM)
+
+.PHONY: clean xclean
diff --git a/SI7005_HTU21D/Readme b/SI7005_HTU21D/Readme
new file mode 100644
index 0000000..0354091
--- /dev/null
+++ b/SI7005_HTU21D/Readme
@@ -0,0 +1,2 @@
+Code to work with I2C T/RH sensors SI7005 or HTU21D (can't work together due to identical 
+addresses)
diff --git a/SI7005_HTU21D/htu21d.c b/SI7005_HTU21D/htu21d.c
new file mode 100644
index 0000000..e594571
--- /dev/null
+++ b/SI7005_HTU21D/htu21d.c
@@ -0,0 +1,166 @@
+/*
+ * This file is part of the sihtu project.
+ * Copyright 2022 Edward V. Emelianov <edward.emelianoff@gmail.com>.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <stdio.h>
+#include <usefull_macros.h>
+
+#include "htu21d.h"
+#include "i2c.h"
+
+// read with no hold master!
+// REGISTERS/COMANDS:
+#define HTU21_READ_TEMP     (0xF3)
+#define HTU21_READ_HUMID    (0xF5)
+#define HTU21_READ_USERREG  (0xE7)
+#define HTU21_WRITE_USERREG (0xE6)
+#define HTU21_SOFT_RESET    (0xFE)
+// status mask & val
+#define HTU21_STATUS_MASK   (0x03)
+#define HTU21_HUMID_FLAG    (0x02)
+// user reg fields
+#define HTU21_REG_VBAT      (0x40)
+#define HTU21_REG_D1        (0x80)
+#define HTU21_REG_D0        (0x01)
+#define HTU21_REG_HTR       (0x04)
+#define HTU21_REG_ODIS      (0x02)
+#define HTU21_REG_VBAT      (0x40)
+#define HTU21_REG_DEFVAL    (0x02)
+
+static HTU21D_status htustatus = HTU21D_RELAX;
+static float Tmeasured, Hmeasured;
+static double lastw = 0.; // last time of measurements start
+
+HTU21D_status HTU21D_get_status(){
+    return htustatus;
+}
+
+static int writecmd(uint8_t cmd){
+    if(1 != write(i2c_getfd(), &cmd, 1)) return FALSE;
+    return TRUE;
+}
+
+/**
+ * @brief HTU21D_read_ID - read user register and compare with default
+ * @return TRUE if all OK
+ */
+int HTU21D_read_ID(){
+    if(htustatus != HTU21D_RELAX) return FALSE;
+	uint8_t ID;
+    if(!i2c_read_reg8(HTU21_READ_USERREG, &ID)){
+        DBG("Can't read HTU_REG_ID");
+        return FALSE;
+    }
+    DBG("HTU, reg: 0x%02x", ID);
+    if(ID != HTU21_REG_DEFVAL){
+        DBG("Not HTU21D or need reloading\n");
+        writecmd(HTU21_SOFT_RESET);
+        return FALSE;
+    }
+    return TRUE;
+}
+
+int HTU21D_startmeasure(){
+    htustatus = HTU21D_BUSY;
+    if(!writecmd(HTU21_READ_TEMP)){
+        htustatus = HTU21D_ERR;
+        return FALSE;
+    }
+    DBG("Wait for T\n");
+    lastw = dtime();
+    return TRUE;
+}
+
+static void HTU21D_cmdH(){
+    htustatus = HTU21D_BUSY;
+    if(!writecmd(HTU21_READ_HUMID)){
+        htustatus = HTU21D_ERR;
+        return;
+    }
+    DBG("Wait for H, dt=%g", dtime() - lastw);
+    lastw = dtime();
+}
+
+int HTU21D_getTH(float *T, float *H){
+    if(htustatus != HTU21D_RDY) return FALSE;
+    if(T) *T = Tmeasured;
+    if(H) *H = Hmeasured;
+    htustatus = HTU21D_RELAX;
+    return TRUE;
+}
+
+#define SHIFTED_DIVISOR 0x988000    //This is the 0x0131 polynomial shifted to farthest left of three bytes
+// check CRC, return 0 if all OK
+static uint32_t htu_check_crc(uint8_t *crc){
+    DBG("HTU check CRC\n");
+    uint32_t remainder = (crc[0] << 16) | (crc[1] << 8) | crc[2];
+    uint32_t divsor = (uint32_t)SHIFTED_DIVISOR;
+    int i;
+    for(i = 0; i < 16; i++) {
+        if (remainder & (uint32_t)1 << (23 - i))
+            remainder ^= divsor;
+        divsor >>= 1;
+    }
+    return remainder;
+}
+
+void HTU21D_process(){
+	uint8_t d[3];
+    if(htustatus != HTU21D_BUSY) return;
+    if(3 != read(i2c_getfd(), d, 3)){ // NACK'ed - not ready
+        if(dtime() - lastw > HTU21D_CONVTIMEOUT){
+            DBG("Wait too long -> err");
+            htustatus = HTU21D_ERR;
+            return;
+        }
+        return;
+    }
+    DBG("Got: 0x%02x, 0x%02x, 0x%02x", d[0], d[1], d[2]);
+    if(htu_check_crc(d)){
+        htustatus = HTU21D_ERR;
+        DBG("CRC failed\n");
+        return;
+    }
+    uint16_t TH = (uint16_t)((d[0]<<8) | d[1]);;
+    if(!(TH & HTU21_HUMID_FLAG)){ // temperature measured
+        Tmeasured = -46.85 + 175.72*(TH & 0xFFFC)/65536.;
+        DBG("T=%.1f", Tmeasured);
+        HTU21D_cmdH();
+    }else{ // humidity measured
+        Hmeasured = -6.f + 125.f*(TH & 0xFFFC)/65536.;
+        DBG("H=%.1f", Hmeasured);
+        htustatus = HTU21D_RDY;
+    }
+}
+
+int HTU21D_heater(int ON){
+    if(htustatus != HTU21D_RELAX) return FALSE;
+    uint8_t val;
+    if(!i2c_read_reg8(HTU21_READ_USERREG, &val)){
+        DBG("Can't read userreg");
+        return FALSE;
+    }
+    DBG("REG: 0x%02x", val);
+    if(ON) val |= HTU21_REG_HTR;
+    else val &= ~HTU21_REG_HTR;
+    DBG("REG -> 0x%02x", val);
+    if(!i2c_write_reg8(HTU21_WRITE_USERREG, val)){
+        DBG("Can't write write userreg");
+        return FALSE;
+    }
+    return TRUE;
+}
diff --git a/SI7005_HTU21D/htu21d.h b/SI7005_HTU21D/htu21d.h
new file mode 100644
index 0000000..59404f0
--- /dev/null
+++ b/SI7005_HTU21D/htu21d.h
@@ -0,0 +1,38 @@
+/*
+ * This file is part of the sihtu project.
+ * Copyright 2022 Edward V. Emelianov <edward.emelianoff@gmail.com>.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+#include <stdint.h>
+
+#define HTU21D_CONVTIMEOUT (2.0)
+
+typedef enum{
+    HTU21D_BUSY,        // measurement in progress
+    HTU21D_ERR,         // error in I2C
+    HTU21D_RELAX,       // relaxed state
+    HTU21D_RDY,         // data ready - can get it
+} HTU21D_status;
+
+HTU21D_status HTU21D_get_status();
+
+int HTU21D_read_ID();
+void HTU21D_process();
+int HTU21D_startmeasure();
+int HTU21D_getTH(float *T, float *H);
+int HTU21D_heater(int ON);
+
diff --git a/SI7005_HTU21D/i2c.c b/SI7005_HTU21D/i2c.c
new file mode 100644
index 0000000..3f4bd64
--- /dev/null
+++ b/SI7005_HTU21D/i2c.c
@@ -0,0 +1,257 @@
+/*
+ * This file is part of the sihtu project.
+ * Copyright 2022 Edward V. Emelianov <edward.emelianoff@gmail.com>.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <fcntl.h>
+#include <sys/ioctl.h>
+#include <asm/ioctl.h>
+#include <linux/i2c.h>
+#include <linux/i2c-dev.h>
+#include <usefull_macros.h>
+
+static uint8_t lastaddr = 0;
+static int I2Cfd = -1;
+
+int i2c_getfd(){return I2Cfd;}
+
+/**
+ * @brief i2c_read_reg8 - read 8-bit addressed register (8 bit)
+ * @param regaddr - register address
+ * @param data - data read
+ * @return state
+ */
+int i2c_read_reg8(uint8_t regaddr, uint8_t *data){
+    if(I2Cfd < 1) return FALSE;
+    struct i2c_smbus_ioctl_data args;
+    union i2c_smbus_data sd;
+    args.read_write = I2C_SMBUS_READ;
+    args.command    = regaddr;
+    args.size       = I2C_SMBUS_BYTE_DATA;
+    args.data       = &sd;
+    if(ioctl(I2Cfd, I2C_SMBUS, &args) < 0){
+        WARN("i2c_read_reg8, ioctl()");
+        return FALSE;
+    }
+    if(data) *data = sd.byte;
+    return TRUE;
+}
+
+/**
+ * @brief i2c_write_reg8 - write to 8-bit addressed register
+ * @param regaddr - address
+ * @param data - data
+ * @return state
+ */
+int i2c_write_reg8(uint8_t regaddr, uint8_t data){
+    if(I2Cfd < 1) return FALSE;
+    struct i2c_smbus_ioctl_data args;
+    union i2c_smbus_data sd;
+    sd.byte = data;
+    args.read_write = I2C_SMBUS_WRITE;
+    args.command    = regaddr;
+    args.size       = I2C_SMBUS_BYTE_DATA;
+    args.data       = &sd;
+    if(ioctl(I2Cfd, I2C_SMBUS, &args) < 0){
+        WARN("i2c_write_reg8, ioctl()");
+        return FALSE;
+    }
+    uint8_t t;
+    if(!i2c_read_reg8(regaddr, &t)) return FALSE;
+    if(t != data){
+        WARNX("Read not same thing that write: 0x%02x instead of 0x%02x", t, data);
+        return FALSE;
+    }
+    return TRUE;
+}
+
+/**
+ * @brief i2c_read_reg16 - read 16-bit addressed register (to 16-bit data)
+ * @param regaddr - address
+ * @param data - data
+ * @return state
+ */
+int i2c_read_reg16(uint16_t regaddr, uint16_t *data){
+    if(I2Cfd < 1) return FALSE;
+    struct i2c_msg m[2];
+    struct i2c_rdwr_ioctl_data x = {.msgs = m, .nmsgs = 2};
+    m[0].addr = lastaddr; m[1].addr = lastaddr;
+    m[0].flags = 0;
+    m[1].flags = I2C_M_RD;
+    m[0].len = 2; m[1].len = 2;
+    uint8_t a[2], d[2] = {0};
+    a[0] = regaddr >> 8;
+    a[1] = regaddr & 0xff;
+    m[0].buf = a; m[1].buf = d;
+    if(ioctl(I2Cfd, I2C_RDWR, &x) < 0){
+        WARN("i2c_read_reg16, ioctl()");
+        return FALSE;
+    }
+    if(data) *data = (uint16_t)((d[0] << 8) | (d[1]));
+    return TRUE;
+}
+
+/**
+ * @brief i2c_write_reg16 - write 16-bit data value to 16-bit addressed register
+ * @param regaddr - address
+ * @param data - data to write
+ * @return state
+ */
+int i2c_write_reg16(uint16_t regaddr, uint16_t data){
+    if(I2Cfd < 1) return FALSE;
+    union i2c_smbus_data d;
+    d.block[0] = 3;
+    d.block[1] = regaddr & 0xff;
+    d.block[2] = data >> 8;
+    d.block[3] = data & 0xff;
+    struct i2c_smbus_ioctl_data args;
+    args.read_write = I2C_SMBUS_WRITE;
+    args.command    = regaddr >> 8;
+    args.size       = I2C_SMBUS_I2C_BLOCK_DATA;
+    args.data       = &d;
+    if(ioctl(I2Cfd, I2C_SMBUS, &args) < 0){
+        WARN("i2c_write_reg16, ioctl()");
+        return FALSE;
+    }
+/*    printf("Block: ");
+    for(int i = 0; i < 4; ++i) printf("0x%02x ", d.block[i]);
+    printf("\n");*/
+    return TRUE;
+}
+
+/**
+ * @brief i2c_set_slave_address - set current slave address
+ * @param addr - address
+ * @return state
+ */
+int i2c_set_slave_address(uint8_t addr){
+    if(I2Cfd < 1) return FALSE;
+    if(ioctl(I2Cfd, I2C_SLAVE, addr) < 0){
+        WARN("i2c_set_slave_address, ioctl()");
+        return FALSE;
+    }
+    lastaddr = addr;
+    return TRUE;
+}
+
+/**
+ * @brief i2c_open - open I2C device
+ * @param path - full path to device
+ * @return state
+ */
+int i2c_open(const char *path){
+    if(I2Cfd > 0) close(I2Cfd);
+    I2Cfd =  open(path, O_RDWR);
+    if(I2Cfd < 1){
+        WARN("i2c_open, open()");
+        return FALSE;
+    }
+    return TRUE;
+}
+
+void i2c_close(){
+    if(I2Cfd > 0) close(I2Cfd);
+}
+
+#if 0
+// Don't work :(
+/**
+ * @brief read_regN8 - read up to I2C_SMBUS_BLOCK_MAX bytes from 8-bit addressed register
+ * @param regaddr - address
+ * @param data - data to read
+ * @param N - amount of bytes
+ * @return state
+ */
+static int read_regN8(uint8_t regaddr, uint8_t *data, uint16_t N){
+    if(I2Cfd < 1 || N > I2C_SMBUS_BLOCK_MAX || N == 0 || !data) return FALSE;
+    struct i2c_smbus_ioctl_data args = {0};
+    union i2c_smbus_data sd = {0};
+    sd.block[0] = N;
+    DBG("block: %d, %d, %d", sd.block[0], sd.block[1], sd.block[2]);
+    DBG("Try to get %d bytes from 0x%02x", N, regaddr);
+    args.read_write = I2C_SMBUS_READ;
+    args.command    = regaddr;
+    args.size       = I2C_SMBUS_BLOCK_DATA;
+    args.data       = &sd;
+    if(ioctl(I2Cfd, I2C_SMBUS, &args) < 0){
+        WARN("read_regN8, ioctl()");
+        return FALSE;
+    }
+    DBG("block: %d, %d, %d", sd.block[0], sd.block[1], sd.block[2]);
+    memcpy(data, sd.block+1, N);
+    return TRUE;
+}
+#endif
+
+/**
+ * @brief read_data16 - read data from 16-bit addressed register
+ * @param regaddr - address
+ * @param N - amount of bytes
+ * @param array - data read
+ * @return state
+ */
+int i2c_read_data16(uint16_t regaddr, uint16_t N, uint8_t *array){
+    if(I2Cfd < 1 || N == 0 || !array) return FALSE;
+    struct i2c_msg m[2];
+    struct i2c_rdwr_ioctl_data x = {.msgs = m, .nmsgs = 2};
+    m[0].addr = lastaddr; m[1].addr = lastaddr;
+    m[0].flags = 0;
+    m[1].flags = I2C_M_RD;
+    m[0].len = 2; m[1].len = N;
+    uint8_t a[2];
+    a[0] = regaddr >> 8;
+    a[1] = regaddr & 0xff;
+    m[0].buf = a; m[1].buf = array;
+    if(ioctl(I2Cfd, I2C_RDWR, &x) < 0){
+        WARN("i2c_read_data16, ioctl()");
+        return FALSE;
+    }
+    return TRUE;
+}
+
+/**
+ * @brief read_data8 - read data from 8-bit addressed register
+ * @param regaddr - address
+ * @param N - amount of bytes
+ * @param array - data read
+ * @return state
+ */
+int i2c_read_data8(uint8_t regaddr, uint16_t N, uint8_t *array){
+    if(I2Cfd < 1 || N < 1 || N+regaddr > 0xff || !array) return FALSE;
+#if 0
+    uint16_t rest = N;
+    do{
+        uint8_t l = (rest > I2C_SMBUS_BLOCK_MAX) ? I2C_SMBUS_BLOCK_MAX : (uint8_t)rest;
+        if(!read_regN8(regaddr, array, l)){
+            DBG("can't read");
+            return FALSE;
+        }
+        rest -= l;
+        regaddr += l;
+        array += l;
+    }while(rest);
+#endif
+    for(uint16_t i = 0; i < N; ++i){
+        if(!i2c_read_reg8((uint8_t)(regaddr+i), array++)){
+            DBG("can't read @%dth byte", i);
+            return FALSE;
+        }
+    }
+    return TRUE;
+}
diff --git a/SI7005_HTU21D/i2c.h b/SI7005_HTU21D/i2c.h
new file mode 100644
index 0000000..8dd1c41
--- /dev/null
+++ b/SI7005_HTU21D/i2c.h
@@ -0,0 +1,40 @@
+/*
+ * This file is part of the sihtu project.
+ * Copyright 2022 Edward V. Emelianov <edward.emelianoff@gmail.com>.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include <stdint.h>
+
+#ifndef FALSE
+#define FALSE 0
+#endif
+#ifndef TRUE
+#define TRUE 1
+#endif
+
+int i2c_getfd();
+int i2c_open(const char *path);
+void i2c_close();
+int i2c_set_slave_address(uint8_t addr);
+int i2c_read_reg8(uint8_t regaddr, uint8_t *data);
+int i2c_write_reg8(uint8_t regaddr, uint8_t data);
+int i2c_read_data8(uint8_t regaddr, uint16_t N, uint8_t *array);
+int i2c_read_reg16(uint16_t regaddr, uint16_t *data);
+int i2c_write_reg16(uint16_t regaddr, uint16_t data);
+int i2c_read_data16(uint16_t regaddr, uint16_t N, uint8_t *array);
+
diff --git a/SI7005_HTU21D/main.c b/SI7005_HTU21D/main.c
new file mode 100644
index 0000000..2622eb8
--- /dev/null
+++ b/SI7005_HTU21D/main.c
@@ -0,0 +1,129 @@
+/*
+ * This file is part of the sihtu project.
+ * Copyright 2022 Edward V. Emelianov <edward.emelianoff@gmail.com>.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <math.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <usefull_macros.h>
+
+#include "htu21d.h"
+#include "si7005.h"
+#include "i2c.h"
+
+#define DEVADDR     (0x40)
+
+typedef struct{
+    char *device;
+    int help;
+    int heater;
+} glob_pars;
+
+static glob_pars G = {.device = "/dev/i2c-3", .heater = -1};
+
+static myoption cmdlnopts[] = {
+    {"help",    NO_ARGS,    NULL,   'h',    arg_int,    APTR(&G.help),      _("show this help")},
+    {"device",  NEED_ARG,   NULL,   'd',    arg_string, APTR(&G.device),    _("I2C device path")},
+    {"heater",  NEED_ARG,   NULL,   'H',    arg_int,    APTR(&G.heater),    _("turn on (>0) or off (0) heater")},
+   end_option
+};
+
+static void showd(float T, float H){
+// Sonntag1990
+#define dB  17.62f
+#define dC  243.12f
+    if(T < -273.15f || H < 0.f) return;
+    float gamma = logf(H/100.f) + dB*T/(dC + T);
+    float Tdp = dC * gamma / (dB - gamma);
+    printf("T=%.1fC, H=%.1f%%, Tdp=%.1fC\n", T, H, Tdp);
+    static int i = 0;
+    if(++i > 3) signals(0);
+}
+
+static void processSI(){
+    static double t0 = 0.;
+    si7005_process();
+    si7005_status s = si7005_get_status();
+    if(s == SI7005_RELAX){
+        if(dtime() - t0 > 1.){
+            DBG("need to start measure");
+            if(si7005_startmeasure()) t0 = dtime();
+        }
+    }else if(s == SI7005_RDY){ // humidity can be shown
+        DBG("Got data");
+        float T, H;
+        if(!si7005_getTH(&T, &H)) return;
+        showd(T, H);
+        t0 = dtime();
+    }else if(s == SI7005_ERR){
+        DBG("got error");
+        if(si7005_startmeasure()) t0 = dtime();
+    }
+}
+static void processHTU(){
+    static double t0 = 0.;
+    HTU21D_process();
+    HTU21D_status s = HTU21D_get_status();
+    if(s == HTU21D_RELAX){
+        if(dtime() - t0 > 1.){
+            DBG("need to start measure");
+            if(HTU21D_startmeasure()) t0 = dtime();
+        }
+    }else if(s == HTU21D_RDY){ // humidity can be shown
+        DBG("Got data");
+        float T, H;
+        if(!HTU21D_getTH(&T, &H)) return;
+        showd(T, H);
+        t0 = dtime();
+    }else if(s == HTU21D_ERR){
+        DBG("got error");
+        if(HTU21D_startmeasure()) t0 = dtime();
+    }
+}
+
+int main(int argc, char **argv){
+    initial_setup();
+    parseargs(&argc, &argv, cmdlnopts);
+    if(G.help) showhelp(-1, cmdlnopts);
+    if(!i2c_open(G.device)) ERR("Can't open %s", G.device);
+    if(!i2c_set_slave_address((uint8_t)DEVADDR)){
+        WARN("Can't set slave address 0x%02x", DEVADDR);
+        goto clo;
+    }
+    //if(!i2c_read_reg8(0, NULL)) ERR("Can't connect!");
+    int si = 1; // == 0 if htu
+    if(!si7005_read_ID()){
+        DBG("Don't see SI7005");
+        si = 0;
+        if(!HTU21D_read_ID()){
+            ERRX("Neither SI7005 nor HTU21D not found");
+        }else while(!HTU21D_startmeasure()) usleep(1000);
+    }else while(!si7005_startmeasure()) usleep(1000);
+    if(G.heater > -1){
+        int ans = FALSE;
+        if(si) ans = si7005_heater(G.heater);
+        else ans = HTU21D_heater(G.heater);
+        if(!ans) WARNX("Can't turn on heater");
+    }
+    while(1){
+        if(si) processSI();
+        else processHTU();
+    }
+clo:
+    i2c_close();
+    return 0;
+}
diff --git a/SI7005_HTU21D/si7005.c b/SI7005_HTU21D/si7005.c
new file mode 100644
index 0000000..e9e7b3e
--- /dev/null
+++ b/SI7005_HTU21D/si7005.c
@@ -0,0 +1,168 @@
+/*
+ * This file is part of the sihtu project.
+ * Copyright 2022 Edward V. Emelianov <edward.emelianoff@gmail.com>.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <stdio.h>
+#include <usefull_macros.h>
+#include <unistd.h>
+
+#include "i2c.h"
+#include "si7005.h"
+
+#define SI7005_REGSTATUS    0
+#define SI7005_STATUSNRDY   1
+#define SI7005_REGDATA      1
+#define SI7005_REGCONFIG    3
+#define SI7005_CONFFAST     (1<<5)
+#define SI7005_CONFTEMP     (1<<4)
+#define SI7005_CONFHEAT     (1<<1)
+#define SI7005_CONFSTART    (1<<0)
+#define SI7005_REGID        0x11
+
+#define SI7005_ID       0x50
+
+static si7005_status sistatus = SI7005_RELAX;
+
+static float Tmeasured, Hmeasured;
+static double lastw = 0.; // last time of measurements start
+
+si7005_status si7005_get_status(){
+    return sistatus;
+}
+
+/**
+ * @brief si7005_read_ID - read device ID
+ * @return TRUE if all OK
+ */
+int si7005_read_ID(){
+    if(sistatus != SI7005_RELAX) return FALSE;
+    //i2c_write_reg8(SI7005_REGCONFIG, 0);
+	uint8_t ID;
+    if(!i2c_read_reg8(SI7005_REGID, &ID)){
+        DBG("Can't read SI_REG_ID");
+        return FALSE;
+    }
+    DBG("SI, device ID: 0x%02x", ID);
+    if(ID != SI7005_ID){
+        DBG("Not SI7005\n");
+        return FALSE;
+    }
+    return TRUE;
+}
+
+/*
+ * start themperature reading @return TRUE if all OK
+ */
+int si7005_startmeasure(){
+    sistatus = SI7005_BUSY;
+    if(!i2c_write_reg8(SI7005_REGCONFIG, SI7005_CONFTEMP | SI7005_CONFSTART)){
+        DBG("Can't write start Tmeas");
+        sistatus = SI7005_ERR;
+        return FALSE;
+    }
+    DBG("Wait for T\n");
+    lastw = dtime();
+    return TRUE;
+}
+
+/*
+ * start humidity reading @return TRUE if all OK
+ */
+static void si7005_cmdH(){
+    sistatus = SI7005_BUSY;
+    i2c_write_reg8(SI7005_REGCONFIG, SI7005_CONFSTART);
+    if(!i2c_write_reg8(SI7005_REGCONFIG, SI7005_CONFSTART)){
+        DBG("Can't write start Hmeas");
+        sistatus = SI7005_ERR;
+        return;
+    }
+    DBG("Wait for H, dt=%g", dtime() - lastw);
+    lastw = dtime();
+}
+
+int si7005_getTH(float *T, float *H){
+    if(sistatus != SI7005_RDY) return FALSE;
+    DBG("dt=%g", dtime() - lastw);
+    DBG("Measured T=%.1f, H=%.1f", Tmeasured, Hmeasured);
+    // correct T/H
+#define A0 (-4.7844f)
+#define A1 (0.4008f)
+#define A2 (-0.00393f)
+    if(H){
+        *H = Hmeasured - (A2*Hmeasured*Hmeasured + A1*Hmeasured + A0);
+    }
+    if(T) *T = Tmeasured;
+    sistatus = SI7005_RELAX;
+    return TRUE;
+}
+
+/*
+ * process state machine
+ */
+void si7005_process(){
+	uint8_t c, d[3];
+    if(sistatus != SI7005_BUSY) return;
+    if(3 != read(i2c_getfd(), d, 3)){
+        DBG("Can't read status");
+        sistatus = SI7005_ERR;
+        return;
+    }
+    DBG("Status: 0x%02x, H: 0x%02x, L: 0x%02x", d[0], d[1], d[2]);
+    if(!i2c_read_reg8(SI7005_REGCONFIG, &c)){
+        DBG("Can't read config");
+        sistatus = SI7005_ERR;
+        return;
+    }
+    DBG("Config: 0x%02x", c);
+    if(d[0] & SI7005_STATUSNRDY){ // not ready yet
+    //if(c & SI7005_CONFSTART){
+        if(dtime() - lastw > SI7005_CONVTIMEOUT){
+            DBG("Wait too long -> err");
+            sistatus = SI7005_ERR;
+            return;
+        }
+        usleep(20000);
+        return;
+    }
+    uint16_t TH = (uint16_t)((d[1]<<8) | d[2]);
+    if(c & SI7005_CONFTEMP){ // temperature measured
+        TH >>= 2;
+        Tmeasured = TH/32.f - 50.f;
+        DBG("T=%.1f", Tmeasured);
+        si7005_cmdH();
+    }else{ // humidity measured
+        TH >>= 4;
+        Hmeasured = TH/16.f - 24.f;
+        DBG("H=%.1f", Hmeasured);
+        sistatus = SI7005_RDY;
+    }
+}
+
+/**
+ * @brief si7005_heater - turn on/off heater
+ * @param ON == 1 to turn on
+ * @return FALSE if failed
+ */
+int si7005_heater(int ON){
+    if(sistatus != SI7005_RELAX) return FALSE;
+    uint8_t reg = (ON) ? SI7005_CONFHEAT : 0;
+    if(!i2c_write_reg8(SI7005_REGCONFIG, reg)){
+        DBG("Can't write write regconfig");
+        return FALSE;
+    }
+    return TRUE;
+}
diff --git a/SI7005_HTU21D/si7005.h b/SI7005_HTU21D/si7005.h
new file mode 100644
index 0000000..b9084a9
--- /dev/null
+++ b/SI7005_HTU21D/si7005.h
@@ -0,0 +1,41 @@
+/*
+ * This file is part of the sihtu project.
+ * Copyright 2022 Edward V. Emelianov <edward.emelianoff@gmail.com>.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include <stdint.h>
+
+// conversion timeout (s)
+#define SI7005_CONVTIMEOUT  2.0
+
+typedef enum{
+    SI7005_BUSY,        // measurement in progress
+    SI7005_ERR,         // error in I2C
+    SI7005_RELAX,       // relaxed state
+    SI7005_RDY,         // data ready - can get it
+} si7005_status;
+
+si7005_status si7005_get_status();
+
+int si7005_read_ID();
+void si7005_process();
+int si7005_startmeasure();
+int si7005_getTH(float *T, float *H);
+int si7005_heater(int ON);
+
+
diff --git a/SI7005_HTU21D/sihtu.cflags b/SI7005_HTU21D/sihtu.cflags
new file mode 100644
index 0000000..68d5165
--- /dev/null
+++ b/SI7005_HTU21D/sihtu.cflags
@@ -0,0 +1 @@
+-std=c17
\ No newline at end of file
diff --git a/SI7005_HTU21D/sihtu.config b/SI7005_HTU21D/sihtu.config
new file mode 100644
index 0000000..e0284f4
--- /dev/null
+++ b/SI7005_HTU21D/sihtu.config
@@ -0,0 +1,2 @@
+// Add predefined macros for your project here. For example:
+// #define THE_ANSWER 42
diff --git a/SI7005_HTU21D/sihtu.creator b/SI7005_HTU21D/sihtu.creator
new file mode 100644
index 0000000..e94cbbd
--- /dev/null
+++ b/SI7005_HTU21D/sihtu.creator
@@ -0,0 +1 @@
+[General]
diff --git a/SI7005_HTU21D/sihtu.creator.user b/SI7005_HTU21D/sihtu.creator.user
new file mode 100644
index 0000000..6603b8e
--- /dev/null
+++ b/SI7005_HTU21D/sihtu.creator.user
@@ -0,0 +1,174 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE QtCreatorProject>
+<!-- Written by QtCreator 6.0.0, 2022-09-28T21:44:32. -->
+<qtcreator>
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+ </data>
+</qtcreator>
diff --git a/SI7005_HTU21D/sihtu.cxxflags b/SI7005_HTU21D/sihtu.cxxflags
new file mode 100644
index 0000000..6435dfc
--- /dev/null
+++ b/SI7005_HTU21D/sihtu.cxxflags
@@ -0,0 +1 @@
+-std=c++17
\ No newline at end of file
diff --git a/SI7005_HTU21D/sihtu.files b/SI7005_HTU21D/sihtu.files
new file mode 100644
index 0000000..0772f21
--- /dev/null
+++ b/SI7005_HTU21D/sihtu.files
@@ -0,0 +1,7 @@
+htu21d.c
+htu21d.h
+i2c.c
+i2c.h
+main.c
+si7005.c
+si7005.h
diff --git a/SI7005_HTU21D/sihtu.includes b/SI7005_HTU21D/sihtu.includes
new file mode 100644
index 0000000..9c558e3
--- /dev/null
+++ b/SI7005_HTU21D/sihtu.includes
@@ -0,0 +1 @@
+.