Crowtail- Relay
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Contents
Description
The Crowtail- Relay module is a digital normally-open switch. Through it, you can control circuit of high voltage with low voltage, say 5V on the controller.
Model: CT0008RE
Features
- High Switching Current
Specification
Dimensions(mm):40.0(L)x20.0(W)x17.2(H)
| Parameter | Description |
|---|---|
| Operating Voltage | 5V |
| Operating Current | 90mA |
| Relay Life | 100,000 Cycle |
| Max Switching Voltage | 120VAC/24VDC |
| Max Switching Current | 3A |
Usage
Intelligent Temperature Control Fan
1.Hardware Connection
2.Copy the demo code to your sketch, then upload to Arduino or Crowduino board.You can set a threshold temperature value to control the realy ON or OFF, then control the fan work or not.
/*
Temperature sensor connect to AO
Relay connetct to D5
*/
#include <math.h>
int a;
float temperature;
int B=3975; //B value of the thermistor
float resistance;
// Connect the Relay to digital pin D5.
// give it a name:
int Relay = 5;
void setup()
{
// initialize the digital pin as an output.
pinMode(Relay, OUTPUT);
Serial.begin(9600);
}
void loop()
{
a=analogRead(0);
resistance=(float)(1023-a)*10000/a; //get the resistance of the sensor;
temperature=1/(log(resistance/10000)/B+1/298.15)-273.15;//convert to temperature via datasheet ;
delay(1000);
Serial.print("Current temperature is ");
Serial.println(temperature);
if(temperature>20)
{
digitalWrite(Relay, HIGH); //if temperature >20 degree,turn the Relay on,fan working
}
else
{
digitalWrite(Relay, LOW);//if temperature <=20 degree,turn the Relay off,fan not working
}
}
3.When the temperature above 20 degrees,the fan will working.
