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Post by raspi2017 on Aug 22, 2019 20:59:05 GMT -8
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.
Thanks
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Post by SDL on Aug 24, 2019 6:42:06 GMT -8
Remember that there is Hysteresis involved with the USB PowerControl board. It will shut off around 3.5V or so, but will not turn on until you get to about 3.9V. This is to prevent the Raspberry Pi getting into a cycle of on/off/on/off/on/off.  BP
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Post by raspi2017 on Sept 1, 2019 16:58:44 GMT -8
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?
Thanks again.
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Post by SDL on Sept 3, 2019 16:45:44 GMT -8
I'm pretty sure you have the wrong line going to TP3. Show me what you are connecting to on the WatchDog timer.
If you connect the wrong one, it won't turn on. Has to be the tristate output (I think it is called Arduino Reset on JP4 (top most pin).
BP
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