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  • Author Author: gtrplyer16
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Arduino Controlled Power Supply

Thoughts on a power supply with three relays in it controlled by an arduino to set the output voltage. Say 3.3v, 5v. and 0 - 15v.

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  • in reply to gadget.iom

    I left my schematic at school but tomorrow I can post a picture. But there is a input voltage (120V @ 60Hz) which goes through a step down transformer (17.5V AC) which then goes through a full wave rectifier. After that I designed my own voltage regulator circuit but for the voltage divider output I have three relays to select one of three resistors and/or pot. So the arduino biases one of three transistors on based on the one of three options picked (3.3, 5, or  to 15) which then turns one of the three relays on therefore selecting an output voltage which is neatly displayed on a 16x2 LCD display which two momentary buttons for flipping through the options and selecting one of the outputs. I can post a picture of the schematic tomorrow there is one error in it that I haven't had time to redraw yet though.