HEAD-AID CRASH SENSOR
Instant SMS Communication Upon Crash
Objectives:
Create a functional prototype for a helmet-mounted crash detection sensor
Transmit GPS coordinates to pre-designated contacts upon crash detection
hardware
ESP32 Microcontroller
ESP32 Microcontroller
ESP32 Microcontroller
Chosen for its versatility and was the focus of the semester-long course ME100 - Electronics for IoT.
LSM6DSO IMU
ESP32 Microcontroller
ESP32 Microcontroller
Accelerometer/gyroscope & temperature sensor included in the ME100 electronics kit. For these purposes, the accelerometer is the only useful function, as gyroscope and temperature data would not be helpful for crash detection.
SIM800L GPRS Module
ESP32 Microcontroller
SIM800L GPRS Module
Module with GPRS and cellular data connectivity (with SIM card). Useful to send the text message to contacts in the case of a crash and for fetching location data. I chose to purchase this module because a) it was inexpensive and b) covered two needs at once with GPS and SMS capabilities built in.
breadboard layout
Breadboard contains ESP32, LSM6DSO IMU, SIM800L GPRS Module, external 5V/3A power source, diode, and 100uF capacitor.
Capacitor across Vin and GND of SIM800L to avoid voltage drops because the module draws large current during SMS delivery and GPRS connection.
Diode between V_in of IMU and V_out of ESP32 to protect ESP32 from backwards flowing current.
micropython code
