Drive relay with AVR microcontroller

Posted on Feb 5, 2014

To drive relay you need more than 20mA the current can one pin drive. This is why you cannot connect relay directly to microcontrollers pin. To drive relay you need to connect simple amplifier made of one transistor. This circuit is more general as instead relay you can connect any other load like lamps, DC motors if you need to control more t

Drive relay with AVR microcontroller
Click here to download the full size of the above Circuit.

han one relay, you might consider using ICs like ULN2003 or ULN2803. These ICs haveDarlingtontransistors inside and can drive up to 500mA each. We aim to transmit more information by carrying articles. Please send us an E-mail to wanghuali@hqew. net within 15 days if we are involved in the problems of article content, copyright or other problems. We will delete it soon.

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