Review on Lystin 4 Channel Relay Module Control Board for UNO R3 MEGA 2560 1280 DSP ARM PIC AVR TTL Logic STM32 Raspberry Pi - DC 5V DC 230V with Optocoupler by Steve Guillen
Yours may be easily scratched.
Everything is scratched. In my analysis they stack them on top of each other and the solder joints below have hollowed out this board.
- Relay output status LEDs. Widely used to control all microcontrollers, industrial sector, PLC control, smart home control.
- A few little things
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