I've been trying to power uxcell bipolar Hall Effect Sensors from the 5v ports of an 18650 Battery Shield (2 battery, v8)
The sensors work perfectly fine when I power from the 5v/GND ports on an Arduino Nano, but I need to power off of the 18650 for my team's project to work. Does anyone know of any differences between the 18650 5v output and the A.N. 5v output ports, or what the 18650s lack that is causing this problem?
(Side note for the HE sensor: the amazon link says unipolar but they are bipolar/latching, and I added the necessary 10k pull up resistor between the 5v and signal wires)
There are multiple circuit designs for the V8. Mine doesn't output 5V properly if the V8 is connected to USB. Are you saying it doesn't work when USB is not connected and the V8 is just running on battery? It should produce 5V under those conditions. But I agree with groundFungus - we need to see the schematic.
Tom, it's not 8V. He's got version 8 of the shield, hence V8. V8 uses two 18650s in parallel. V3 uses just one. And I believe there's a 4-cell version. Anyway, the shield outputs 5V via a USB Type-A connector, and 3.3V and 5V via headers.
I can't find a schematic for the 18650, but here's what the HE wiring looks like. The battery shield is upside down so it's hard to see, but the green things are screw terminals on the other side (the problem isn't bad soldering/bad wire connection).
To your question Sherman - yes the V8 is just running on battery, we aren't using the USB ports.
No I don't have them connected - should I? And yes I checked all the connections with a multimeter and nothing seems off. My coworker suggested this problem could be related to the battery possibly having a high frequency output, but honestly I don't know enough to test if he's correct nor how to fix that.
