This is a 5V, 10A 2-Channel Relay interface board. It can be used to control various appliances, and other equipments with large current. It can be controlled directly with 3.3V or 5V logic signals from a microcontroller (Arduino, 8051, AVR, PIC, DSP, ARM, ARM, MSP430, TTL logic).
It has a 1×4 (2.54mm pitch) pin header for connecting power (5V and 0V), and for controlling the 2 relays. The pins are marked on the PCB:
- GND – Connect 0V to this pin.
- IN1 – Controls relay 1, active Low! Relay will turn on when this input goes below about 2.0V
- IN2 – Controls relay 2, active Low! Relay will turn on when this input goes below about 2.0V
- VCC – Connect 5V to this pin. Is used to power the opto couplers
There is a second 1×3 (2.54mm pitch) pin header for supplying the “relay side” of the board with 5V. At delivery, a jumper is present on this header selecting the 5V signal from the 1×4 pin header to power the relays. For default operation, don’t change this jumper!
The pins of the 1×3 pin header are marked on the PCB:
- RY-VCC – This is the 5V required for the relays. At delivery, a jumper is present on this and the adjacent (VCC) pin.
- VCC – This is the 5V VCC supplied on the 1×4 pin connector
- GND – Connected to 0V pin of 1×4 pin header
If opto isolation is required, an isolated 5V supply should be used. For normal operation, a jumper bewtween pins 1 and 2 selects the 5V signal from the 1×4 pin header. This means both the “input side”, and “relay side” use the same 5V supply, and there is no opto-isolation.
- High current relay, AC250V 10A, DC30V 10A
- 2 LEDs to indicate when relays are on
- Works with logic level signals from 3.3V or 5V devices
- Opto isolation circuitry
- PCB size: 50×45 mm