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ATX monitor

What is that ?

ATX monitor is a cheap way to build a work bench power supply from an old ATX block. It uses an arduino and a LCD display to monitor and display output values (both voltage and current) from 3.3V, 5V and 12V rails.

Hardware

  • 1 x ATX power supply
  • 1 x Arduino (pro mini)
  • 1 x An LCD display compatible with LiquidCrystal (YB2004A 20x4 lines)
  • 6 x Some resistor to build voltage divider, value is not important as you avoid more that 5V output
  • 3 x ACS 712 current sensor modules (you can also build yourself with a raw ACS712 and a couple of resistor and capacitor)

Electronic wiring

I used an Arduino pro mini.

LCD

  • LCDRs -> Arduino pin 4
  • LCDEn -> Arduino pin 5
  • LCDDb4 -> Arduino pin6
  • LCDDb5 -> Arduino pin7
  • LCDDb6 -> Arduino pin8
  • LCDDb7 -> Arduino pin9

Voltage input

  • 12V ATX output -> voltage divider -> Arduino pin A5
  • 5V ATX output -> voltage divider -> Arduino pin A4
  • 3.3V ATX output -> Arduino pin A3

Current sensor

  • 12V rail ACS712 -> Arduino pin A0
  • 5V rail ACS712 -> Arduino pin A1
  • 3.3V rail ACS712 -> Arduino pin A2

Software

Adjust values from DEFINE section to match your hardware.