Hello
I have the 4G module and it works with Waterproof Ultrasonic Sensor (AJ-SR04M) using many of the digital pins.
But when the same code is added to your BharatPi_4G_based_HTTP_Post_Call_ThingSpeak_Samplecode sample, it doesnt read the distance.
Could you tell me which are the most safe Pins for TRIGGER_PIN and ECHO_PIN ?
I even tried to measure before the modemPowerOn() function is executed. But no success.