Have two Zumos Robots with Shields 1.2 on both. Have connected two 3.7V LiPo in series to the Charge connector (with no internal batteries) to both and they have been working nicely since the modification (last year).
Yesterday, something odd happened to one of the robots:
With power button OFF and without any Arduino connected:
As soon I connect the LiPo batteries to the charge connector:
[ul] - the two LEDs (red and blue) next to the (-) battery connector (in the right bottom side of the shield), will slowly power up (~2 seconds)
- the same happen to the red LED next to the (-) battery connector (in the left bottom side)
- they aren’t as bright as in normal operation
- Voltage from LiPo = 8.2V
- V BAT connector = 1.3V
- V in from Arduino connector = 6.3V[/ul]
You can see similar reaction from the 3 LEDs (lightened LEDs slowing fading out) when you switch the power button from ON to OFF of the robot that is working normally.
I’ve connect the LiPo directly to the batteries pads (instead of the charge connector), but with the same results. Maybe the Q1 or/and Q2 mosfets have same problem?
Can you help me identify the problem? ^_^’
Thank you very much.