Hi. I have a GroveWeatherPi that I've been testing. Everything seemed to be working Then I connected the TP3 point on the USB Power Control to the Watchdog Arduino Reset pin (JP4) and let it run. It was fine for a day or so, then got some heavy cloud and the battery ran down and the power was cut from the USB Power Control (as expected from a low battery). But when the sun came out the next day and charged the battery, the computer did not restart. The day after that, I opened it up and the only led on was the green one in the top right corner of the SunAirPlus board. I pulled the lead from the TP3 point off the Watchdog and all the leds lit up and the Pi restarted. Do I have the TP3 connected to the correct pin? Or is there something wrong with the board? Since everything was working fine before connecting that lead, I should have everything else connected correctly. I get good numbers and graphs when it is running. It just won't restart after a low battery.
Yes. I am aware of the hysteresis function. As stated in the first post, the restart seems to go fine. . . after I disconnect the TP3 lead from the Watchdog. This tells me that the battery is charging to or beyond 3.9V, otherwise it should not restart. Correct? What I don't know is why is the TP3 link not allowing that to happen?