# KS0266 keyestudio Eight-channel Solid State Relay Module

![](media/image-20260112111414993.png)

## 1. Introduction

Keyestudio eight-channel solid state relay is **active at HIGH** level, that is to say, the input control signal is the high level (3.3-5 V), the relay is on; while the input control signal is low level (0-2.5 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.

![](media/image-20260112111725983.png)

## 2. Performance Parameters

- Electrical parameters:

|           | Voltage | Static Current | Working Current | Trigger Voltage | Trigger Current |
| :-------: | :-----: | :------------: | :-------------: | :-------------: | --------------- |
| Channel 1 |  DC 5V  |      0mA       |     13.8mA      |     3.3-5V      | 2mA             |
| Channel 2 |  DC 5V  |      0mA       |     26.8mA      |     3.3-5V      | 2mA             |
| Channel 3 |  DC 5V  |      0mA       |      37mA       |     3.3-5V      | 2mA             |
| Channel 4 |  DC 5V  |      0mA       |      48mA       |     3.3-5V      | 2mA             |
| Channel 5 |  DC 5V  |      0mA       |      59mA       |     3.3-5V      | 2mA             |
| Channel 6 |  DC 5V  |      0mA       |      70mA       |     3.3-5V      | 2mA             |
| Channel 7 |  DC 5V  |      0mA       |      81mA       |     3.3-5V      | 2mA             |
| Channel 8 |  DC 5V  |      0mA       |      90mA       |     3.3-5V      | 2mA             |

- Output port： AC 100V/2A

## 3. Connection Diagram

![](media/image-20260112111909620.png)

## 3. Sample Code

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

```c
int BASE = 3 ;  //The first relay I/O port
int NUM = 8 ;  //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, HIGH);    //Set the digital I/O port outputs to "HIGH", that is, gradually open relay
     delay(200);        //delay
   }
   for (int i = BASE; i < BASE + NUM; i ++) 
   {
     digitalWrite(i, LOW);    //Set the digital I/O port outputs to "LOW", that is, gradually close relay
     delay(200);        //delay
   }  
}
```

## 4. Result

Wiring as the above image, after powered-on, eight-channel solid state relays are first connected and then broken successively,repeating alternately.