Relay Module

This tutorial will show you how to connect a generic relay module, flash specific firmware, and launch the additional user's interface.


Items needed

  • Leo Rover
  • 1-4 channels relay module
  • IDC plug 2x3
  • a ribbon cable (6 core)

Connect the module

In case of powering and controlling a relay module, we highly recommend using the hSense1 port.

By default hSense2 and hSense3 are reserved for a GPS and an IMU module.

Connect the relay board to the hSens1 port using the IDC plug. Pins 1-4 are dedicated for signals, pin 5 is +5V and the last one is GND.

hSens pin
Module pin
2 CH2
3 CH3
4 CH4
5 +5V

Flash the dedicated firmware

We developed a version of the leo_firmware with added features for controlling the relays.

Make sure you have the git tool installed on your system, then clone firmware repository to any folder on your computer and change the branch to feature/relay:

git clone https://github.com/LeoRover/leo_firmware.git 
cd leo_firmware 
git checkout feature/relay


Now, you need to build the firmware and flash it to the Rover. For instructions on how to do it, please follow the Firmware development tutorial:

Firmware development

Restart the leo service to be sure that new topics are registered properly.

sudo systemctl restart leo

Configure the additional UI

The first step of adding the new interface is to clone UI's repository from GitHub to the home directory.

git clone https://github.com/LeoRover/leo_ui_sample_relay.git

In case of launching the additional UI reconfiguration of the nginx service is needed. Follow the tutorial below:

Include an additional UI

Launch the additional UI

The new interface is available on port 90. To launch it in your WEB browser just type LeoRover's IP address colon port number.


Need help? Contact us - contact@fictionlab.pl