diff --git a/.gitignore b/.gitignore
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diff --git a/stepper/interrupts.c b/stepper/interrupts.c
index 9f6ebac..ae73304 100644
--- a/stepper/interrupts.c
+++ b/stepper/interrupts.c
@@ -22,6 +22,7 @@
 #include "ports_definition.h"
 #include "main.h"
 #include "stepper.h"
+#include "soft_i2c.h"
 
 // Top Level Interrupt
 INTERRUPT_HANDLER(TLI_IRQHandler, 0){}
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diff --git a/voltmeters/kicad/5-digit/5digit_voltmeter.pro b/voltmeters/kicad/5-digit/5digit_voltmeter.pro
index 4f9f8c0..e953760 100644
--- a/voltmeters/kicad/5-digit/5digit_voltmeter.pro
+++ b/voltmeters/kicad/5-digit/5digit_voltmeter.pro
@@ -1,6 +1,6 @@
-update=Сб 31 янв 2015 21:44:03
+update=Вт 17 фев 2015 00:34:33
 version=1
-last_client=kicad
+last_client=eeschema
 [cvpcb]
 version=1
 NetIExt=net
@@ -40,13 +40,8 @@ LibName11=valves
 version=1
 [eeschema]
 version=1
-PageLayoutDescrFile=
-SubpartIdSeparator=0
-SubpartFirstId=65
-LibDir=/Data/documents/00__Electronics/STM8/voltmeters/kicad
+LibDir=/home/eddy/Docs/ELECTRONICS/STM8/voltmeters/kicad/5-digit;/home/eddy/Docs/ELECTRONICS/STM8/voltmeters/kicad
 NetFmtName=
-SpiceForceRefPrefix=0
-SpiceUseNetNumbers=0
 RptD_X=0
 RptD_Y=100
 RptLab=1
diff --git a/voltmeters/kicad/5-digit/5digit_voltmeter.sch b/voltmeters/kicad/5-digit/5digit_voltmeter.sch
index bde17cb..ddb1fe4 100644
--- a/voltmeters/kicad/5-digit/5digit_voltmeter.sch
+++ b/voltmeters/kicad/5-digit/5digit_voltmeter.sch
@@ -35,13 +35,13 @@ LIBS:mcp3421
 LIBS:seven_segm
 LIBS:stm8s003
 LIBS:5digit_voltmeter-cache
-EELAYER 24 0
+EELAYER 27 0
 EELAYER END
 $Descr A4 11693 8268
 encoding utf-8
 Sheet 1 1
 Title ""
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+Date "16 feb 2015"
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-F 1 "C3" H 3606 5365 40  0000 L CNN
+F 0 "C3" H 3600 5550 40  0000 L CNN
+F 1 "0.68u" H 3606 5365 40  0000 L CNN
 F 2 "" H 3638 5300 30  0000 C CNN
 F 3 "" H 3600 5450 60  0000 C CNN
 	1    3600 5450
@@ -616,10 +616,10 @@ Wire Wire Line
 Wire Wire Line
 	3600 4950 3800 4950
 $Comp
-L GND #PWR10
+L GND #PWR014
 U 1 1 54CDA4A6
 P 3600 5750
-F 0 "#PWR10" H 3600 5750 30  0001 C CNN
+F 0 "#PWR014" H 3600 5750 30  0001 C CNN
 F 1 "GND" H 3600 5680 30  0001 C CNN
 F 2 "" H 3600 5750 60  0000 C CNN
 F 3 "" H 3600 5750 60  0000 C CNN
diff --git a/voltmeters/kicad/seven_segm.lib b/voltmeters/kicad/seven_segm.lib
index c772063..fdf92f1 100644
--- a/voltmeters/kicad/seven_segm.lib
+++ b/voltmeters/kicad/seven_segm.lib
@@ -1,13 +1,77 @@
-EESchema-LIBRARY Version 2.3  Date: Сб 31 янв 2015 18:14:19
+EESchema-LIBRARY Version 2.3
 #encoding utf-8
 #
+# 4-digit,common_cathode
+#
+DEF 4-digit,common_cathode DIS 0 40 Y Y 1 F N
+F0 "DIS" 0 500 60 H V C CNN
+F1 "4-digit,common_cathode" 0 -450 60 H V C CNN
+F2 "" -450 0 60 H V C CNN
+F3 "" -450 0 60 H V C CNN
+DRAW
+C -520 -320 20 0 1 0 F
+C -70 -320 20 0 1 0 F
+C 380 -320 20 0 1 0 F
+C 830 -320 20 0 1 0 F
+S -1150 400 1150 -400 0 1 0 N
+P 6 0 1 0  -850 -20  -550 -20  -600 -320  -900 -320  -850 -20  -850 -20 N
+P 6 0 1 0  -800 320  -500 320  -550 20  -850 20  -800 320  -800 320 N
+P 6 0 1 0  -400 -20  -100 -20  -150 -320  -450 -320  -400 -20  -400 -20 N
+P 6 0 1 0  -350 320  -50 320  -100 20  -400 20  -350 320  -350 320 N
+P 6 0 1 0  50 -20  350 -20  300 -320  0 -320  50 -20  50 -20 N
+P 6 0 1 0  100 320  400 320  350 20  50 20  100 320  100 320 N
+P 6 0 1 0  500 -20  800 -20  750 -320  450 -320  500 -20  500 -20 N
+P 6 0 1 0  550 320  850 320  800 20  500 20  550 320  550 320 N
+X E 1 -1450 250 300 R 50 50 1 1 I
+X D 2 -1450 150 300 R 50 50 1 1 I
+X DP 3 -1450 50 300 R 50 50 1 1 I
+X C 4 -1450 -50 300 R 50 50 1 1 I
+X G 5 -1450 -150 300 R 50 50 1 1 I
+X DIG4 6 -1450 -250 300 R 50 50 1 1 I
+X B 7 1450 -250 300 L 50 50 1 1 I
+X DIG3 8 1450 -150 300 L 50 50 1 1 I
+X DIG2 9 1450 -50 300 L 50 50 1 1 I
+X F 10 1450 50 300 L 50 50 1 1 I
+X A 11 1450 150 300 L 50 50 1 1 I
+X DIG1 12 1450 250 300 L 50 50 1 1 I
+ENDDRAW
+ENDDEF
+#
+# ARK-SN410362N
+#
+DEF ARK-SN410362N DIS 0 40 Y Y 1 F N
+F0 "DIS" 0 500 60 H V C CNN
+F1 "ARK-SN410362N" 0 -450 60 H V C CNN
+F2 "" 0 0 60 H V C CNN
+F3 "" 0 0 60 H V C CNN
+DRAW
+C -70 -320 20 0 1 0 F
+C 430 -320 20 0 1 0 F
+S 550 -400 -550 450 0 1 0 N
+P 6 0 1 0  -400 -20  -100 -20  -150 -320  -450 -320  -400 -20  -400 -20 N
+P 6 0 1 0  -350 320  -50 320  -100 20  -400 20  -350 320  -350 320 N
+P 6 0 1 0  100 -20  400 -20  350 -320  50 -320  100 -20  100 -20 N
+P 6 0 1 0  150 320  450 320  400 20  100 20  150 320  150 320 N
+X G 1 -850 300 300 R 50 50 1 1 I
+X DP 2 -850 150 300 R 50 50 1 1 I
+X A 3 -850 0 300 R 50 50 1 1 I
+X F 4 -850 -150 300 R 50 50 1 1 I
+X DIG2 5 -850 -300 300 R 50 50 1 1 I
+X D 6 850 -300 300 L 50 50 1 1 I
+X E 7 850 -150 300 L 50 50 1 1 I
+X C 8 850 0 300 L 50 50 1 1 I
+X B 9 850 150 300 L 50 50 1 1 I
+X DIG1 10 850 300 300 L 50 50 1 1 I
+ENDDRAW
+ENDDEF
+#
 # ARK-SP410361N
 #
 DEF ARK-SP410361N DIS 0 40 Y Y 1 F N
 F0 "DIS" 0 500 60 H V C CNN
 F1 "ARK-SP410361N" 0 -450 60 H V C CNN
-F2 "~" -250 0 60 H V C CNN
-F3 "~" -250 0 60 H V C CNN
+F2 "" -250 0 60 H V C CNN
+F3 "" -250 0 60 H V C CNN
 DRAW
 C -320 -320 20 0 1 0 F
 C 130 -320 20 0 1 0 F
@@ -34,34 +98,4 @@ X DIG1 12 1050 250 300 L 50 50 1 1 I
 ENDDRAW
 ENDDEF
 #
-#
-# ARK-SN410362N
-#
-DEF ARK-SN410362N DIS 0 40 Y Y 1 F N
-F0 "DIS" 0 500 60 H V C CNN
-F1 "ARK-SN410362N" 0 -450 60 H V C CNN
-F2 "~" 0 0 60 H V C CNN
-F3 "~" 0 0 60 H V C CNN
-DRAW
-C -70 -320 20 0 1 0 F
-C 430 -320 20 0 1 0 F
-S 550 -400 -550 450 0 1 0 N
-P 6 0 1 0  -400 -20  -100 -20  -150 -320  -450 -320  -400 -20  -400 -20 N
-P 6 0 1 0  -350 320  -50 320  -100 20  -400 20  -350 320  -350 320 N
-P 6 0 1 0  100 -20  400 -20  350 -320  50 -320  100 -20  100 -20 N
-P 6 0 1 0  150 320  450 320  400 20  100 20  150 320  150 320 N
-X G 1 -850 300 300 R 50 50 1 1 I
-X DP 2 -850 150 300 R 50 50 1 1 I
-X A 3 -850 0 300 R 50 50 1 1 I
-X F 4 -850 -150 300 R 50 50 1 1 I
-X DIG2 5 -850 -300 300 R 50 50 1 1 I
-X D 6 850 -300 300 L 50 50 1 1 I
-X E 7 850 -150 300 L 50 50 1 1 I
-X C 8 850 0 300 L 50 50 1 1 I
-X B 9 850 150 300 L 50 50 1 1 I
-X DIG1 10 850 300 300 L 50 50 1 1 I
-ENDDRAW
-#
-ENDDEF
-
 #End Library
diff --git a/voltmeters/src/5-digit/interrupts.c b/voltmeters/src/5-digit/interrupts.c
index 9ec8b45..d9fd39f 100644
--- a/voltmeters/src/5-digit/interrupts.c
+++ b/voltmeters/src/5-digit/interrupts.c
@@ -21,6 +21,7 @@
 
 #include "stm8l.h"
 #include "interrupts.h"
+#include "soft_i2c.h"
 
 // Top Level Interrupt
 INTERRUPT_HANDLER(TLI_IRQHandler, 0){}
@@ -85,26 +86,15 @@ INTERRUPT_HANDLER(TIM5_CAP_COM_IRQHandler, 14){}
 INTERRUPT_HANDLER(TIM2_UPD_OVF_BRK_IRQHandler, 13){}
 
 // Timer2 Capture/Compare Interrupt
-// store the current counter value and wait for next pulse
+// process soft I2C
 INTERRUPT_HANDLER(TIM2_CAP_COM_IRQHandler, 14){
-	/*
-	TIM2_CR1 = 0; // stop timer
-	if(TIM2_SR2){ // overcapture: noice etc.
-		TIM2_SR2 = 0;
-		TIM2_SR1 = 0;
-		ZW_off();
-		return;
+	if(TIM2_SR1 & TIM_SR1_UIF){
+		TIM2_SR1 &= ~TIM_SR1_UIF; // take off flag
+		tick_counter++;
+		process_soft_I2C();
 	}
-	ZW_catch_bit();
-	TIM2_SR1 = 0;
-	TIM2_CNTRH = 0;
-	TIM2_CNTRL = 0;
-	*/
 }
-/*
-	TIM2_CCMR2 = 1; // IC2 is mapped on TI2FP2
-	TIM2_CCMR1 = 2; // IC1 is mapped on TI2FP1
-*/
+
 #endif // STM8S903
 
 #if defined (STM8S208) || defined(STM8S207) || defined(STM8S007) || defined(STM8S105) || \
diff --git a/voltmeters/src/5-digit/main.c b/voltmeters/src/5-digit/main.c
index e9ffcd6..719e9b0 100644
--- a/voltmeters/src/5-digit/main.c
+++ b/voltmeters/src/5-digit/main.c
@@ -22,6 +22,7 @@
 #include "main.h"
 #include "interrupts.h"
 #include "led.h"
+#include "soft_i2c.h"
 
 U32 Global_time = 0L; // global time in ms
 eeprom_data *saved_data = (eeprom_data*)EEPROM_START_ADDR;
@@ -66,7 +67,8 @@ void eeprom_default_setup(){
 int main() {
 	U32 T_LED = 0L;  // time of last digit update
 	U32 T_time = 0L; // timer
-
+	long voltage = 0L;
+	U8 cntr = 0;
 	// Configure clocking
 	CLK_CKDIVR = 0; // F_HSI = 16MHz, f_CPU = 16MHz
 	// Configure pins
@@ -103,18 +105,46 @@ int main() {
 	TIM2_IER = TIM_IER_CC2IE;
 	*/
 	eeprom_default_setup();
+	soft_I2C_setup();
+	soft_I2C_write_config(0xd0, 0x1c); // write configuration
 	// enable all interrupts
 	enableInterrupts();
 	set_display_buf("-----"); // on init show -----
 	// Loop
 	do {
-		if(((unsigned int)(Global_time - T_time) > 1000) || (T_time > Global_time)){ // once per 3 seconds we start measurement
+		// onse per 300ms refresh displayed value
+		if(((unsigned int)(Global_time - T_time) > 300) || (T_time > Global_time)){
 			T_time = Global_time;
-			display_long(testtimer++,0);
+			switch (soft_I2C_state){
+				case SOFT_I2C_NO_DEVICE:
+					set_display_buf(" EEE "); // error
+				break;
+				default: // refresh data
+					voltage /= cntr;
+					display_long(voltage, 1);
+					cntr = 0;
+					voltage = 0;
+			}
+
+			//display_long(testtimer++,0);
 		}
 		if((U8)(Global_time - T_LED) > LED_delay){
+			if(soft_I2C_state == SOFT_I2C_DATA_READ_OK){
+				if((readed_data & 1<<7) == 0){ // !RDY == 0
+					readed_data >>= 8;
+					// prepare data for rounded output
+					voltage += (long)(readed_data & 0x3ffff);
+					cntr++;
+				}
+			}
 			T_LED = Global_time;
 			show_next_digit();
+			// refresh data
+			if(soft_I2C_state == SOFT_I2C_NO_DEVICE){ // try to repeat writing config after an error
+				soft_I2C_write_config(0xd0, 0x1c);
+			}else{
+				soft_I2C_read4bytes(0xd0);
+			}
 		}
 	} while(1);
 }
diff --git a/voltmeters/src/5-digit/main.h b/voltmeters/src/5-digit/main.h
index 3227695..556c13f 100644
--- a/voltmeters/src/5-digit/main.h
+++ b/voltmeters/src/5-digit/main.h
@@ -18,6 +18,9 @@
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
  * MA 02110-1301, USA.
  */
+#pragma once
+#ifndef __MAIN_H__
+#define __MAIN_H__
 
 #include "stm8l.h"
 
@@ -31,3 +34,7 @@ typedef struct{
 	U32 max_ADU;
 }eeprom_data;
 
+#define CONCAT(a,b)		a##_##b
+#define PORT(a,b)		CONCAT(a,b)
+
+#endif // __MAIN_H__
diff --git a/voltmeters/src/5-digit/soft_i2c.c b/voltmeters/src/5-digit/soft_i2c.c
new file mode 100644
index 0000000..3b6b9db
--- /dev/null
+++ b/voltmeters/src/5-digit/soft_i2c.c
@@ -0,0 +1,203 @@
+/*
+ * soft_i2c.c - functions emulating I2C
+ *
+ * Copyright 2015 Edward V. Emelianoff <eddy@sao.ru>
+ *
+ * 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 2 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, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+ * MA 02110-1301, USA.
+ */
+
+#include "soft_i2c.h"
+#include "main.h"
+
+// data to transmit: MSB is devaddr, LSB is configuration byte
+U16 transmit_cmd;
+// == 0 when transmission is in progress
+U8 transmission_over = 1;
+// tick counter: two ticks for one bit writting and two ticks for empty
+U8 tick_counter;
+soft_I2C_errors soft_I2C_state = SOFT_I2C_BUSY;
+
+U16 tr_mask = 0; // mask that would be &`ded with transmit_cmd
+U32 readed_data; // data readed by I2C
+U32 rd_counter = 0; // counter of readed bits == 64 in start of reading; decrements in each readed bit
+
+/*
+ ********************* GPIO (page 111) ********************
+ * Px_ODR - Output data register bits
+ * Px_IDR - Pin input values
+ * Px_DDR - Data direction bits (1 - output)
+ * Px_CR1 - DDR=0: 0 - floating, 1 - pull-up input; DDR=1: 0 - pseudo-open-drain, 1 - push-pull output [not for "T"]
+ * Px_CR2 - DDR=0: 0/1 - EXTI disabled/enabled; DDR=1: 0/1 - 2/10MHz
+ *
+ */
+/**
+ * configure pins: SDA - open-drain output
+ * SCL - push/pull
+ * configure timer2 as CLK (default speed is 100kHz)
+ */
+void soft_I2C_setup(){
+	PORT(I2C_SCL_PORT, DDR) |= I2C_SCL_PIN;
+	PORT(I2C_SDA_PORT, DDR) |= I2C_SDA_PIN;
+	PORT(I2C_SDA_PORT, CR1) |= I2C_SDA_PIN;
+	// Configure timer 2 to generate signals for CLK
+	TIM2_PSCR = 0; // 16MHz
+	TIM2_IER = TIM_IER_UIE; // update interrupt enable
+	TIM2_CR1 |= TIM_CR1_APRE | TIM_CR1_URS; // auto reload + interrupt on overflow
+	TIM2_ARRH = 0; // set 2.5ms period (100kHz)
+	TIM2_ARRL = 10;
+}
+
+/**
+ * Set speed of soft I2C
+ * @param Pulse_len - period (in us) of one pulse
+ */
+void soft_I2C_set_speed(U16 Pulse_len){
+	Pulse_len << 2; // multiply on 4 as we have four pulses for each bit, each pulse is 62.5ns
+	TIM2_ARRH = Pulse_len >> 8; // set speed
+	TIM2_ARRL = Pulse_len & 0xff;
+}
+
+/*
+ * The data transmission runs only when SCL==1 & SDA have constant level,
+ * otherwice, if SCL==1 and SDA changes, this is: START(1->0) or STOP(0->1)
+ */
+void i2c_transmit(){
+	soft_I2C_state = SOFT_I2C_BUSY;
+	transmission_over = 0;
+	tick_counter = 0;
+	rd_counter = 0;
+	readed_data = 0;
+	TIM2_CR1 |= TIM_CR1_CEN; // turn on timer
+}
+
+/**
+ * write a byte to config register of device dev
+ * @param dev  - device address
+ * @param conf - configuration byte data
+ */
+U8 soft_I2C_write_config(U8 dev, U8 conf){
+	if(!transmission_over || (TIM2_CR1&TIM_CR1_CEN)) return SOFT_I2C_BUSY;
+	dev &= 0xfe; // make sure that r/!w clear
+	transmit_cmd = dev<<8 || conf;
+	i2c_transmit();
+	return SOFT_I2C_OK;
+}
+
+/**
+ * prepare to read 4 bytes of data
+ * @param dev - device address
+ */
+U8 soft_I2C_read4bytes(U8 dev){
+	if(!transmission_over || (TIM2_CR1&TIM_CR1_CEN)) return SOFT_I2C_BUSY;
+	dev |= 1; // make sure that r/!w is set
+	transmit_cmd = dev<<8;
+	i2c_transmit();
+	return SOFT_I2C_OK;
+}
+
+void process_soft_I2C(){
+	U8 nbit, bitinbyte, tick; // bit number
+	if(transmission_over){
+		TIM2_CR1 &= ~TIM_CR1_CEN; // turn off timer
+		// return line to NOT BUSY state
+		PORT(I2C_SCL_PORT, ODR) |= I2C_SCL_PIN;
+		PORT(I2C_SDA_PORT, ODR) |= I2C_SDA_PIN;
+		return;
+	}
+	nbit = tick_counter >> 2; // divide by 4
+	if(nbit == 0){ // start
+		switch (tick_counter){
+			case 1: // 2nd half of start pulse
+				PORT(I2C_SDA_PORT, ODR) &= ~I2C_SDA_PIN; // clear SDA - Start bit
+			break;
+			case 3: // turn to zero both SCL & SDA
+				PORT(I2C_SCL_PORT, ODR) &= ~I2C_SCL_PIN; // clear SCL, SDA is already cleared
+			break;
+			default: // keep current state
+				;
+		}
+		tr_mask = 1<<15; // MSB first
+		return;
+	}
+	bitinbyte = (nbit-1) % 9; // bit counter in each byte
+	tick = tick_counter % 4; // this is a tick inside bit
+	// now prepare data
+	if(bitinbyte == 8){ // ACK
+		switch (tick){
+			case 0: // ACK bit
+				if(nbit == 9) // check line - set ACK to 1
+					PORT(I2C_SDA_PORT, ODR) |= I2C_SDA_PIN;
+				else // set ACK to 0 - we are in reading mode
+					PORT(I2C_SDA_PORT, ODR) &= ~I2C_SDA_PIN;
+			break;
+			case 1: // check ACK
+				if(nbit == 9 && (PORT(I2C_SDA_PORT, ODR) & I2C_SDA_PIN)){ // not zero - very bad
+					transmission_over = 1;
+					soft_I2C_state = SOFT_I2C_NO_DEVICE;
+					return;
+				}
+			break;
+			default: // do nothing
+				;
+		}
+	}else{//data transmision; or STOP
+		if((tr_mask == 0) && (rd_counter == 0)){ // data sent, now we should send STOP in write mode
+			// in reading mode - send STOP only when rd_mask == 0
+			if(tick == 1){ // STOP is 0->1 when CLK is high
+				PORT(I2C_SDA_PORT, ODR) |= I2C_SDA_PIN;
+				transmission_over = 1;
+				if(transmit_cmd & 1<<8) // reading mode
+					soft_I2C_state = SOFT_I2C_DATA_READ_OK;
+				else // writting mode
+					soft_I2C_state = SOFT_I2C_DATA_SEND_OK;
+			}
+		}
+		if(tick == 0){ // start of bit
+			if(tr_mask){ // transmission
+				if(transmit_cmd & tr_mask){ // send one
+					PORT(I2C_SDA_PORT, ODR) |= I2C_SDA_PIN;
+				} // if we need to send 0, we already have data in zero state
+				tr_mask >>= 1;
+				// stop transmission after first byte in read mode
+				if((tr_mask == 1<<7) && (transmit_cmd & 1<<8)){ // go to reading mode
+					tr_mask = 0;
+					rd_counter = 64;
+				}
+			}
+		}else if(tick == 1){ // capture readed data
+			if((tr_mask == 0) && (transmit_cmd & 1<<8)){ // we are waiting for data
+				rd_counter--;
+				readed_data <<= 1;
+				if(PORT(I2C_SDA_PORT, IDR) & I2C_SDA_PIN) // read 1
+					readed_data |= 1;
+			}
+		}
+	}
+	// and at last - set level of SCL
+	switch (tick){ // set proper value of SCL
+		case 0: // high pulse
+			PORT(I2C_SCL_PORT, ODR) |= I2C_SCL_PIN;
+		break;
+		case 3: // low pulse & clear SDA
+			PORT(I2C_SDA_PORT, ODR) &= ~I2C_SDA_PIN;
+			PORT(I2C_SCL_PORT, ODR) &= ~I2C_SCL_PIN;
+		break;
+		default: // do nothing
+			;
+	}
+
+}
+
diff --git a/voltmeters/src/5-digit/soft_i2c.h b/voltmeters/src/5-digit/soft_i2c.h
new file mode 100644
index 0000000..a52e261
--- /dev/null
+++ b/voltmeters/src/5-digit/soft_i2c.h
@@ -0,0 +1,52 @@
+/*
+ * soft_i2c.h
+ *
+ * Copyright 2015 Edward V. Emelianoff <eddy@sao.ru>
+ *
+ * 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 2 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, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+ * MA 02110-1301, USA.
+ */
+
+#pragma once
+#ifndef __SOFT_I2C_H__
+#define __SOFT_I2C_H__
+
+#include "stm8l.h"
+
+// SDA - PC7, SCL - PD1
+#define I2C_SDA_PORT	PC
+#define I2C_SDA_PIN		GPIO_PIN7
+#define I2C_SCL_PORT	PD
+#define I2C_SCL_PIN		GPIO_PIN1
+
+typedef enum{
+	 SOFT_I2C_OK            // all OK
+	,SOFT_I2C_BUSY          // previous transmission is active
+	,SOFT_I2C_NO_DEVICE     // no device found
+	,SOFT_I2C_DATA_SEND_OK  // data transmitted without errors
+	,SOFT_I2C_DATA_READ_OK  // data readed without errors
+} soft_I2C_errors;
+
+extern soft_I2C_errors soft_I2C_state;
+extern U32 readed_data;
+extern U8 tick_counter;
+
+void soft_I2C_setup();
+void soft_I2C_set_speed(U16 Pulse_len);
+void process_soft_I2C();
+U8 soft_I2C_write_config(U8 dev, U8 conf);
+U8 soft_I2C_read4bytes(U8 dev);
+
+#endif // __SOFT_I2C_H__
diff --git a/voltmeters/src/5-digit/testproj.bin b/voltmeters/src/5-digit/testproj.bin
index b355932..383485d 100644
Binary files a/voltmeters/src/5-digit/testproj.bin and b/voltmeters/src/5-digit/testproj.bin differ