stm32samples/F1/Timelapse_keyboard

Time-lapse as USB HID keyboard

This tool allow to get precision time of events: pressing switch, changing distance measured by ultrasonic or infrared sensor, laser light disappearing on photoresistor

Just connect board to any device with USB keyboard support, after some time (needed to establish GPS connection and precision timer setup) it will simulate keyboard on which somebody types time of sensors' state changing

Sensors supprorted

• SHARP GP2Y0A02YK - infrared distance-meter
• HCSR04 - ultrasonic distance-meter
• simple switch-button
• photoresistor + laser

To get precision time this tool use GPS module (NEO-6M)

Connection diagram

Pin	Function
PA0	Infrared sensor data
PA1	Laser photoresistor data
PA2	GPS Rx (MCU Tx)
PA3	GPS Tx (MCU Rx)
PA4	GPS PPS signal
PA5	Trigger (button) switch
PB10	Ultrasonic "TRIG" pin
PB11	Ultrasonic "ECHO" pin

Powering devices

• To power up GPS module you can use +5V or +3.3V.
• Ultrasonic & Infrared sensors need +5V power.
• Photoresistor should be connected to +3.3V by one pin, another pin (data) should be pulled to ground by 1kOhm resisror