Arduino TinkerKit Relay Module
Overview
A relay is an electrically operated switch that allows you to turn on or off a circuit using voltage
and/or current much higher than the Arduino could handle. There is no connection between the low
voltage circuit operated by Arduino and the high power circuit. The relay protects each circuit from each
other.
Warning: We don't recommend you operate circuits powered at more than 24V without the supervision
of an expert.
Input: The relay is a simple mechanical on/off switch. It activates when the input reaches 5v and tu rns
off when the input is 0v. You can control it t hough the digitalWrite() funct ion on Arduino.
The module provides three connections labeled COM, NC and NO. NC stands for "NORMALLY CLOSED".
This means that when the relay has no signal (LOW or 0V from an Arduino), the connected circuit wil be
active; conversely, if you apply 5V or pull the pin HIGH, it will turn the connected circuit off. NO stands
for "NORMALLY OPEN", and functions in the opposite way; when you apply 5V the circuit turns on, and
at 0V the circuit turns off. Relays can replace a manual switch. Remove the switch and connect its wires
to COM and NO. When the relay is activated the circuit is closed and current can flow to the device you
are controlling.
Module Description: this module features an 250v 10A mounted on a 2 module TinkerKit board, one
standard TinkerKit 3pin connector, one transistor, a green LED that signals that the module is correctly
powered and an yellow LED th at indicates when the relay is active.
This module is an ACTUATOR. The connector is an INPUT which must be connected to one of the
OUTPUT connectors on the TinkerKit Shield.
you avoid unexpected errors.
Code Example
/*
based on Blink, Arduino's "Hello World!"
Turns on a Relay on for one second, then off for one second, repeatedly.
The Tinkerkit Relay Module is hooked up on O1
This example code is in the public domain.
*/
#define O0 11
#define O1 10
#define O2 9
#define O3 6
#define O4 5
#define O5 3
#define I0 A0
#define I1 A1
#define I2 A2
#define I3 A3
#define I4 A4
#define I5 A5
void setup() {
// initialize the digital pin as an output.
pinMode(O1, OUTPUT);
}
void loop() {
digitalWrite(O1, HIGH); // turn the relay on
delay(1000); // wait for a second
digitalWrite(O1, LOW); // turn the relayoff
delay(1000); // wait for a second
}
