This board has two relays, along with the necessary circuitry to drive the relays. Each channel has it's own LED indicator to indicate when the relay is activated. The relays have both normally-open and normally-closed contacts on screw terminals, and are rated for 10A at 250V AC or 30V DC.
Dimensions : 51mm L x 39mm W x 20mm H.
Ordering and Postage.
Orders received before 2pm on normal weekdays will be posted the same day. Orders received later or on public holidays/weekends will be posted the next business day. We will post Royal Mail 2nd Class at no charge. If you want faster delivery, please ensure you select Royal Mail 1st Class - or if you are really in a hurry there is an option for guaranteed delivery by 1pm the next business day.
Orders totalling over 12 pounds will be upgraded to 1st Class at no extra cost - this is the total of all items you order from us, so check out our shop for other items you might need.
Technical information.
Please note: the relays are activated by a low voltage. The output pin on your micro-controller should be set to low/off to activate the relay and high/on to turn it off.
Each relay requires around 50-60mA when activated, but this is drawn from the VCC connection : the switching lines (IN1 etc.) need much lower current (a few mA) and can be driven directly by the micro-controller. In normal operation, with a 5V Arduino, the jumper is left in place and the Arduino can supply all power from it's 5V output. If using a 3.3V device (Raspberry Pi or ESP8266) or if power supply is limited, the jumper should be removed, and a separate 5V supply used for the relays by connecting it to JD-VCC.
Thanks for your interest!