This modules contains 8 relays, rated at 5V and 10A. Each relay has a LED indicator. It can be used to control various appliances, and other equipment 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). Each relay has an Optocoupler, providing optical isolation. Each relay also have a freewheeling diode protection. This module has a 10 pin header(standard 2.54mm pitch) for connecting power (5V and GND), and controlling the 8 relays. These pins have the following functions:
- IN1 to IN8: Controls relays 1 to 8, active Low! Relay will turn on when this input goes below about 2.0V
- GND: Connect 0V to this pin. Is used to power the board (optocouplers and relays)
- VCC: Connect 5V to this pin. Is used to power the board (optocouplers and relays)
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 main 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:
- JD-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 main pin connector
- GND – Connected to 0V pin of main pin header
If opto isolation is required, an isolated 5V supply should be used. For normal operation, a jumper between pins 1 and 2 selects the 5V signal from the main pin header. This means both the “input side”, and “relay side” use the same 5V supply, and there is no opto-isolation.
For liability and safety reasons we DO NOT recommend using this module with voltages above 24V. Any use of this module is at your own risk! Always take necessary safety precautions when working with high voltages to prevent electrical shock! We will take no responsibility for any damage, personal injury or death incurred due to using this unit with high voltages!
Please note: The relays used are normally Songle or Tongling, which are both good quality and have the same specifications. During shipping to us from Asia, these modules some times get small scratches on top of the relays (from the other boards rubbing against them).
Please note these are VERY LOW cost boards from China. If you expect a premium product, this is NOT for you. These boards might have scratches on them, might not be the cleanest, and the packaging might have scratches or small tears. For example, if the board has pin headers, they are often ship to us from China all together in a bag, and the pins might be slightly bent or protrude through the bag. If this is not acceptable, please look for a more premium product. After all our costs (10% GST, over 10% eBay/PayPal fee and "Free" shipping we have to pay for), you can appreciate that there is very, very little profit margin left for us. We bring you these products at a very good price, but keep in mind it is a very low cost, cheap and nasty cheap product - exactly the same as similar price products sold by other sellers.
- Channels: 8 Relays
- Relay Voltage: 5V
- Relay Coil Current: 72mA at 5V per relay
- Relay Output Current: 10A at 250VAC, 10A at 30VDC
- Board Supply: 5V supply voltage
- Input Type: Opto Isolated inputs
- Power LED: 1 LED for power indication
- Channel LEDs: 8 LEDs to indicate state of each relay
- Module dimension: 134mm x 52mm
4 x Relay Module 8ch 5V