5v / 12v 8-channel Arduino Relay Module Control Board With Optocoupler Isolation

5v 12v 8 channel Arduino Relay Module control board with optocoupler isolation , demo code

Specifications:

8-channel relay module
1, the relay using the Song Yue relay, the output contact capacity 10A 250VAC, 10A 30VDC, easily used in home appliances, or industrial.

2, relay 5V, 12V, 2, default 5V, 12V, please contact the store or message.

3,8 Road are high, namely high relay.

Each relay has normally open and normally closed contact.

5,8 Road, optically isolated, safe, reliable, high noise immunity.

6, can be selected by jumper relay and TTL or ground.

7, with a power indicator. 8-way road has a status indicator.

8, with the relay coil to absorb the diode protection.

9, the circuit board size 140mm X-55mm mounting hole size 133mm X-40mm

8-channel relay module and  4-channel relay works basically the same, but more several outputs.
 the code is quite simple,
Arduino test code:
int BASE = 2; / / first a relay connected to I / O pins
int NUM = 8; / / the total number of relay
void setup ()
{
for (int i = BASE; i <BASE + NUM; i + +)
{
pinMode (i, OUTPUT); / / set the digital I / O pin as an output
}
}
void loop ()
{
for (int i = BASE; i <BASE + NUM; i + +)
{
digitalWrite (i, LOW); / / set the digital I / O pin output is "low", that is gradually closed relay
delay (200); / / delay
}
for (int i = BASE; i <BASE + NUM; i + +)
{
digitalWrite (i, HIGH); / / set the digital I / O pin output is "low", that gradually open relay
delay (200); / / delay
}
}

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