iPAS / Mbed_LoRa_Loadcell

Read weight values from popular different loadcell ADCs: HX711, ADS1232, and ADS1220, then transmit via LoRaWAN network.

Introduction

This project is meant to test low-power embedded system over wireless communication such LoRaWAN. Based on Mbed platform and EmOne's STM32L151x controller, modules: HX711, ADS1232, and ADS1220 have been used for recording and streaming weights over the network.

Wiring Diagram

• Download (EaglePCB Schematic)

Using

All helper scripts are placed in scripts directory.

• To compile code: scripts/compile.sh
• To flash firmware, it depends on your programmer:

  • ST-Link: use the scripts/flash_stlink.sh which commands with the ST-Flash software.

  • SEGGER's J-Link V2: use the scripts/flash_jlink.sh which commands with the SEGGER's J-Flash software.

Experiment

The result

Notes

Mbed Framework

• After mbed import a library into the project, please command mbed deploy consecutively.

• Tracking Memory Usage in Mbed-OS

LoRaWAN & Gateway

• SSH to the Gateway
• Connect Gateway to the Internet
• Using Built-in ChirpStack
• Firmware of the node
  • Edit the configuration in mbed_app.json file.