This whitepaper is for historical reference only. Some content might be outdated and some links might not be available.
Use a Pycom LoPy4 ESP32 development board equipped with a Semtech SX1276 LoRa transceiver to simulate the river level sensor.
Figure 12 –
The microcontroller is awakened every ten minutes from deep sleep using its real-time clock (RTC), and configured to run a short MicroPython application which retrieves a distance reading to the water surface using the HC-SR04 ultrasonic distance sensor. The captured distance is thereafter reorganized into two bytes – the first byte houses the distance in meters, and the second byte houses the remainder in centimeters.
This data is then broadcast out using LoRaWAN.
This paper provides a MicroPython application example which demonstrates the application running on generic MicroPython for ESP32 firmware. When running, the console displays the distance recorded by the HC-SR04 ultrasonic distance sensor, LoRaWAN OTAA join status, and the bytes sent.
The following is a running sample MicroPython application:
Distance recorded (0.1722414m)
Waiting to join LoRaWAN using OTAA...
Waiting to join LoRaWAN using OTAA...
Waiting to join LoRaWAN using OTAA...
Joined LoRaWAN
Bytes sent (bytearray(b'\x00\x11'))
Sleeping... (600000ms)
