The microcontroller-based concept was chosen because I wanted to scale the sensor system later to suit other applications. Here is the diagram of my Arduino ... Now is the time to see the sample code ...

Nano Sensor Interface * Arduino Nano (v3) in Sleep Mode * T.K.Hareendran/2018 */ #include <avr/sleep.h> #include <avr/power.h> int tgrPin = 2; // Trigger Input_Interrupt 0 Pin int drvPin = 13; // ...

Like the Nano, the Micro's size and male pin headers ... environment sensor, RC522 RFID module, and TFT display module. The I2C/TWI pins on the Micro are on D2 and D3. For Arduino beginners ...