4 ms·
> Might be the long cables I use The long cables where? I think I know what you're getting at but I would really love some more explanation if possible.
by peatfreak 8y ago
> Might be the long cables I use
The long cables where? I think I know what you're getting at but I would really love some more explanation if possible.
- hoosieree 8y agoI'll take a guess at what they meant, and offer an explanation. All wires have resistance, and all else being equal, a 2x longer wire will have 2x more resistance. Due to Ohm's law, there is a voltage drop in the cable when you are powering a load (such as the RPi), and this drop will eventually go below the minimum for the load. Example: the RPi needs 5 volts at 2 amps. If your cable is 0.1 ohms, then the voltage at the Pi will be 5 - (2 * 0.1) == 4.8 volts. If your cable is 1 ohms, the voltage at the Pi will be 5 - (2 * 1) == 3 volts. But because the Pi doesn't always need the full 2 amps, that 1 ohm cable will work sometimes, making debugging harder. Only when you try to do something compute and/or RAM intensive will you notice the board randomly die.
- ganeshkrishnan 8y agoThis is right. The way I have setup my home office I need a 3x wire cables for my raspberry pis and this is probably causing an undervolt. I might have to connect a display/vnc and check for warnings. The LED light does go steady red which is an indication that it has conked off and needs a hard reboot