Arduino Relay Module Pinout
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The following figure shows the relay module pinout.
Arduino relay module pinout. A normally open configuration works the other way in which the relay is always open until you send a signal from the arduino to the relay module to close the circuit. Learn to interface one channel relay module with arduino along with relay working hardware overview pinout wiring and arduino code. The arduino can be programmed to turn on the relay when a certain event occurs for example when the temperature of a thermistor gets higher than 30 c. In pin is used to control the relay.
So connect the 5v and the ground of the arduino with the 5v and the ground of the relay module. The relay module allows you to use a separate power supply to drive the relay coils. In this example we will connect the relay module with arduino in the normally open state. The connections for connecting the relay module with arduino are very simple.
Jd vcc 5vdc 200ma external power supply relay coils vcc versus jd vcc. Or when the resistance of a photoresistor drops below 400 ohms. We just programmed the arduino to make the relay pin a0 high and low with a delay of 1 second. Almost any sensor can be used to trigger the relay to turn on or off.
The arduino can be programmed to turn on the 4 channel relay module when a certain event occurs for example when the temperature of a thermistor gets higher than 30 c. We saw that arduino boards are programmed using a language derived from c and c in arduino s integrated development environment ide and learned a few basic debugging methods in this post we ll be taking a closer look at the arduino hardware and more specifically the arduino uno pinout. 3 3v 1 channel relay module. The six pins on the left side of the relay module connect high voltage and the pins on the right side connect the component that requires low voltage the arduino pins.
It is an active low pin meaning the relay will be activated when you pull the pin low and it. Learn how to use relay with arduino how relay works how to connect relay to arduino how to code for relay how to program arduino step by step. An arduino digital i o pin can drive 40ma max and around 20ma nominal. Arduino uno pinout guide.
Optocouplers are in use to isolate the arduino output pins from the. Since the arduino operates at 5v it can t control these higher voltage devices directly but you can use a 5v relay to switch the 120 240v current and use the arduino to control the relay. In this configuration the relay is always closed and remains closed until you send a signal from the arduino to the relay module to open the circuit. A relay coil requires 20ma to open.
Let s have a look at the pinout of one channel relay module. Then connect the signal pin of the relay module with the pin 12 of the arduino.
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