Just opened the arduino mega and 8 channel relay board. All you need is apply power via the vcc and gnd and give it a pulse at in to turn on the relay.
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The example well build shows how to control a relay module with an arduino and a pir motion sensor.
Arduino 8 relay module wiring. This is a 8 channel low level trigger relay and it can be applied to arduino and raspberry pi. The modules three pins are vcc in and gnd. The arduino bluetooth relay 8 channels app supports controlling an 8 channel relay module via bluetooth hc 05 hc 06 hc 07 ect modules.
This 8 channel relay module can adopt most common range of microcontrollers such as arduino raspberry pi avr pic arm with digital outputs to control larger loads devices like ac or dc motors electromagnets soleniod incandescent light bulbs actuators and any another devices that you want to drive with in the relay. We connect the ir motion sensor out to pin 4 and the relay in1 to pin 8. Here the in pin of the module is attached to d3 of the arduino uno.
This relay module allows you to combine the processing power of the arduino to devices that use higher current and voltage. Setting d3 therefore turns on the relay and turns on the lamp. Here is a wiring diagram you can use.
We make a brief introduction to the relay module and build a simple project example with the arduino. It does so by providing four relays that are rated for 7a at either 28vdc or 10a at 125vac. One of the most useful things you can do with an arduino buy it on amazon ebay is control higher voltage 120 240v devices like fans lights heaters and other household appliancessince the arduino operates at 5v it cant 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.
Didnt realize the relay board is active low but sorted it in the end. The relays will. The light bulb has one of the 120v wire spliced to connect the end connected to the power plug to the comcommon pin of the relay module and the one going to the lamp is connected to the ncnormally closed pin.
A relay can be used to control high voltages with a low voltage by connecting it to an mcu. By the end of this tutorial you should be able to control any electronics appliances with your arduino using a relay module. Relays are suitable for driving high power electronic devices such as lights electric fans and air condition.
Simple blinking sketch to check everything works.
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