Description

The LVRM, BPSM, DDRM, UHFM, RRM, SM and GPSM boards are DIN rail modules of the DINFox project. They embed the following features:

• LVRM: relay with configurable coil voltage and controlled by the MCU.
• BPSM: backup power supply for the DINFox system.
• DDRM: DC-DC converter with configurable output voltage and controlled by the MCU.
• UHFM: 433 / 868 MHz modem for radio monitoring and remote control.
• RRM: rectifier and regulator with configurable output voltage and controlled by the MCU.
• SM: sensors module with embedded temperature/humidity sensor, 4 analog inputs, 4 digital I/Os and external shield support (with I2C and I/Os).
• GPSM: GPS module with active antenna support.
• Analog measurements such as input voltage, output voltage and output current.
• RS485 communication.

Hardware

The boards were designed on Circuit Maker V2.0. Below is the list of hardware revisions:

Hardware revision	Description	Status
LVRM HW1.0	Initial version with monostable relay.	✅
LVRM HW2.0	Initial version with bistable relay.	✅

Hardware revision	Description	Status
BPSM HW1.0	Initial version.	✅

Hardware revision	Description	Status
DDRM HW1.0	Initial version.	✅

Hardware revision	Description	Status
UHFM HW1.0	Initial version.	✅

Hardware revision	Description	Status
RRM HW1.0	Initial version.	✅

Hardware revision	Description	Status
SM HW1.0	Initial version.	✅

Hardware revision	Description	Status
GPSM HW1.0	Initial version.	✅

Embedded software

Environment

The embedded software is developed under Eclipse IDE version 2023-09 (4.29.0) and GNU MCU plugin. The script folder contains Eclipse run/debug configuration files and JLink scripts to flash the MCU.

Target

The boards are based on the STM32L011F4U6, STM32L031G6U6 and STM32L041K6U6 microcontrollers of the STMicroelectronics L0 family. Each hardware revision has a corresponding build configuration in the Eclipse project, which sets up the code for the selected board.

Structure

The project is organized as follow:

• inc and src: source code split in 7 layers:
  • registers: MCU registers adress definition.
  • peripherals: internal MCU peripherals drivers.
  • utils: utility functions.
  • components: external components drivers.
  • sigfox: Sigfox EP library low level implementation.
  • nodes : Nodes descriptors.
  • applicative: high-level application layers.
• lib: Sigfox EP and ADDON-RFP libraries submodules.
• startup: MCU startup code (from ARM).
• linker: MCU linker script (from ARM).

Sigfox library

The UHFM board uses Sigfox technology to perform the system remote monitoring (and light remote control). The project is based on the Sigfox end-point open source library which is embedded as a Git submodule.