1. Low Voltage Indicator shows up during boot. This could happen for several reasons – usually poor wiring or power supply quality. Be aware that by adding ATXRaspi to your setup you insert a lot of extra cabling and this can be a factor. During ATXRaspi load tests this indicator can show up intermittently (usually during boot, and varies with load and supply quality) but it’s usually not a problem and there was no instability.
- Use the best power supply you can get – we recommend using something like the CanaKit 2.5A supply which was load tested with ATXRaspi and is performing great
- Use good quality jumper wires if you power via GPIO
- Try to keep wires/cables short
- According to official Pi release notes, the warning shows when the 5V voltage rail drops below 4.65V. In our load tests this 4.65V condition could not be recorded with any of the supplies tested, either with an oscilloscope (roll 128ksps) or with the Fluke87V in Voltage Peak Detect Mode (1ksps+).
2. Disconnecting ATXRaspi and powering up the Pi directly will cause it to shutdown soon after boot up. This is because the signal ATXRaspi was using is setup as an input without a pull-up/pulldown resistor which might be floating and be picked up by the shutdowncheck script. To eliminate this problem – comment out or remove the line you added in the /etc/rc.local file before you disconnect ATXRaspi (otherwise you might not have another chance to do it with ATXRaspi disconnected – because of repeated shutdowns).
3. ATXRaspi does not cut off power to RaspberryPi after a shutdown is initiated. This can happen if the shutdown process takes longer than the “shutdown time window”. In this time of about 50 seconds, the power LED pulses and ATXRaspi waits for the BOOTOK signal to go LOW. If that does not happen, ATXRaspi assumes something prevents the Pi from shutting down properly, or the shutdown script is no longer running. It will therefore keep power ON if the BOOTOK is still HIGH after this time window. This was discussed in this forum thread, and the user was able to speed up the Pi by using a faster SD card.