Imagine that I found a bunch of mistakes I don't like and I'm redesigning this power on circuit. For now I'll use simple logic but later rev. I'll probably use a pic
A related issue I found w pi power... Sometimes the pi has an internal failure and stops doing what you want. In my case, it crashed while running a kiln, causing run away heating and melting. On a farm system it could fail to shut off water etc
The solution I found was a pi hat that monitors a heartbeat pulse on a particular gpio. If the pulse fails. It kills power to the power strip, and pi. If valves/relays are wire properly valves close and relays open on power loss.
The power controller I just finished (next rev of the hardware) can do this , the Pi also can run it;s own WDT -- good idea if you need extra reliability
Note -- I updated this logic -- read here --https://www.vinthewrench.com/p/chasing-raspberry-pi-power-management
Imagine that I found a bunch of mistakes I don't like and I'm redesigning this power on circuit. For now I'll use simple logic but later rev. I'll probably use a pic
A related issue I found w pi power... Sometimes the pi has an internal failure and stops doing what you want. In my case, it crashed while running a kiln, causing run away heating and melting. On a farm system it could fail to shut off water etc
The solution I found was a pi hat that monitors a heartbeat pulse on a particular gpio. If the pulse fails. It kills power to the power strip, and pi. If valves/relays are wire properly valves close and relays open on power loss.
I will go hunt for that board
The power controller I just finished (next rev of the hardware) can do this , the Pi also can run it;s own WDT -- good idea if you need extra reliability
https://www.tindie.com/products/omzlo/piwatcher-the-best-watchdog-for-your-raspberry-pi/ piWatcher but apparently out of stock. If you are still working the redesign, you might consider this feature