Simple project to implement universal DRL(daytime running lights) and automatic headlights controller using simple MODBUS-RTU 4 way relay module with STM8 MCU which was bought here. Descripton says about STM8S103, but I got STM8S003, it doesn't matter for our purposes. That board has SWIM interface to reprogram board and use for any other purposes. Presence of STM8 MCU, 12V power input and relays makes this board perfect for automotive use.
S1 switch - reset mcu
S2 switch - PA3
LED - PD4
IN1 - PD3
IN2 - PD2
IN3 - PC7
IN4 - PC6
Relay 1 (low is on) - PB4
Relay 2 (low is on) - PC3
Relay 3 (low is on) - PC4
Relay 4 (low is on) - PC5
UART TX - PD5
UART RX - PD6
brew install sdcc
git clone https://github.com/vdudouyt/stm8flash.git
cd stm8flash
make
sudo make install
STM8S003F3P6
Unlock chip:
stm8flash -c stlinkv2 -p stm8s003?3 -u
There is a need to add resstors and protective diods to board input.
sdk project directory is a part of official SDK for microcontroller, see files inside for license information
See LICENSE file for everything else.