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An arduino program to toggle power and reset buttons on standard ATX PC's, and to read the status of the machine (Powered on or off, Power present @ PSU).
I was building a 3-node cluster to test some cluster-filesystems for a client, and used 'wake-on-lan' to remotely boot the various cluster nodes when needed. This worked somewhat, but I was unable to reboot a hanging system, or see if a wake-on-lan packet actually arrived at the system.
Doing some tests with a firmata sketch on an arduino proved that I could easily toggle the powerbutton and resetbutton on an ATX mainboard, bringing this project to life.
The code can be found on https://github.com/sigio/remotereset-arduino
- Connect the arduino to a usb port on a working system (I used a openwrt based router).
- Connect the digital pins to the power and reset lines on an ATX mainboard.
- Make a serial connection to the arduino (115200 baud)
- Configure the pin-numbers (see 'help' command, use 'config' command)
- Toggle reset and/or power buttons with commands 'reset #', 'power #' or 'force #'
- Force will hold the (power) button for 4 seconds, reset and power only simulate a short press
- Use the 'check #' command to see if a system is powered on
Usage Session Example
> RemoteReset-Arduino started > help Help: config Edit configuration config [0-7] resetpin pwrpin name reset # Toggle reset switch on config # power # Toggle power switch on config # force # Long-Press power switch on pc number # erase # Erase config number # state Check power state dump Dump configuration to serial save Save configuration to EEPROM load Load configuration from EEPROM wipe Wipe onfiguration and update EEPROM > dump Config Config: 0 Data: 0 / 255 / 255 / unused Config: 1 Data: 1 / 7 / 6 / gluster1 Config: 2 Data: 1 / 3 / 2 / gluster2 Config: 3 Data: 1 / 4 / 5 / gluster3 Config: 4 Data: 0 / 255 / 255 / unused Config: 5 Data: 0 / 255 / 255 / unused Config: 6 Data: 0 / 255 / 255 / unused Config: 7 Data: 0 / 255 / 255 / unused > power 1 Sending power signal to pin: 6