Open alanp-sporelab opened 4 years ago
The lower limitation voltage of DCDC converter(※1) for using AA battery is 2.2V, so that if the batteries voltage go below 2.2V, the board won't work normally.
In case of you connect directly to nRF52 without using DCDC converter(※2), nRF52 is possible works properly unless the battery voltage goes below 1.7V.
We are scheduled to implement shutdown sequence by nrf52 POFCON when AA batteries voltage dropped to 2.2V.
※1: Short-circuit: JP1.1 <-> JP1.2; Short-circuit: JP2.1 <-> JP2.2 ※2: Short-circuit: JP1.1 <-> JP2.1; Short-circuit: JP1.2 <-> JP2.2, input voltage is up to 3.6V
After letting the Degu unit run on battery power for an extended period, the Degu unit shuts itself down itself due to low battery (output says ~2.2V, read using the battery example code). Battery discharge:
After replacing the battery of the degu unit, main.py file is found to be corrupted. Details:
After replacing corrupted main.py, the Degu unit is still unable to connect to the gateway (A6). Suspect that the network information partition is also corrupted. After using “dd” to clear network information partition and re-register unit on gateway, it started to work again.
We've been running two Degu units on batteries. This issue has happened twice on the same Degu unit so far, but hasn't occurred on the other which was also battery powered, and also ran down the batteries to the point of power failure, but with no corruption.