31 Oct '17, 5am

Learn how to build an #Arduino controlled #USB power supply!

The switches that control the circuit are mounted onto a separate breadboard for simplicity. Two momentary pushbuttons are used to adjust the output of the power supply. One end of each switch is connected to GND. The opposite end is connected digital pins 10 and 11. These digital pins are also connected to the 5V with 100 kohm resistors. These act as pull-up resistors and set the digital pins HIGH until the buttons are pressed. The third switch is a single pole double throw toggle switch. This switch sets the output mode. The two end pins of the switch are connected to GND and 5V. The center pin is connected to digital pin 12. When pin 12 is connected to 5V the system is set to output a constant voltage. When pin 12 is connected to GND the system is set to output a constant current.

Full article: https://www.allaboutcircuits.com/projects/arduino-control...

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