# KS0264 keyestudio Two-channel Solid State Relay Module

![](media/wps1.png)

## 1. Introduction

Keyestudio two-channel solid state relay is **active at LOW** level, that is to say, the input control signal is the low level (0-1.5 V), the relay is on; while the input control signal is high level (3-5 V), the relay is off.

Solid State Relay is a new kind of contactless switching device, which is composed of all solid state electronic components.

Compared with the electromagnetic relay, it has higher reliability, with the features of non-contact, long service life, fast speed and less outside interference.

The output control terminal of keyestudio solid-state relay must be connected to the circuit, **can only be AC (Alternating Current)** , so that the solid state relay can be disconnected normally.

![image-20260112105927825](media/image-20260112105927825.png)

## 2. Performance Parameters

- Electrical parameters:

|  Voltage  | Static Current | Working Current | Trigger Voltage | Trigger Current |      |
| :-------: | :------------: | :-------------: | :-------------: | :-------------: | ---- |
| Channel 1 |     DC 5V      |       0mA       |     12.5mA      |     0-1.5V      | 2mA  |
| Channel 2 |     DC 5V      |       0mA       |     12.5mA      |     0-1.5V      | 2mA  |

- Output port： AC 100V/2A

## 3. Connection Diagram

![](media/wps2.jpg)

## 4. Sample Code

Download code :  [Code](./Code.7z)

```c
 int BASE = 3 ;  //The first relay I/O port
int NUM = 2;   //Total number of relay

void setup()
{
   for (int i = BASE; i < BASE + NUM; i ++) 
   {
     pinMode(i, OUTPUT);   //Set the digital I/O port to output
   }
}

void loop()
{
   for (int i = BASE; i < BASE + NUM; i ++) 
   {
     digitalWrite(i, LOW);    //Set the digital I/O port outputs to "low", that is, gradually open relay
     delay(200);        //delay
   }
   for (int i = BASE; i < BASE + NUM; i ++) 
   {
     digitalWrite(i, HIGH);    //Set the digital I/O port outputs to "high", that is, gradually close relay
     delay(200);        //delay
   }  
}
```

## 5. Result

Wiring as the above diagram, after powered-on, the two-channel solid state relay is first connected and then disconnected successively, repeating alternately.