ESP32-POE-EA Baterry Monitor on Pin 35

Started by jamin, November 23, 2020, 07:17:59 am

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jamin

Hey,

I need help trying to monitor my battery voltage levels on this board. In the pin out guide it suggests I can jumper the "SENS_BAT_E1" connection to get an analog voltage on gpi35. I don't see this jumper on the board, can someone point me to it?

LubOlimex

What revision of the board do you have? The jumper you seek should be called "BAT_SENS_E1", but it was added in hardware revision D boards and newer. It is a small PTH jumper. It is located near the CHRG1 LED.

It seems to be opened by default, meaning battery sense is not enabled. To have the readings to pin GPI35 - first find the PTH jumper pads, then solder the two pads together to close it (or place 0R resistor between the pads).
Technical support and documentation manager at Olimex

jamin

Thanks for the response! The board is a rev C. Is this still possible to do? There is no jumper by the charge light.

LubOlimex

There is no battery measurement circuitry in revision C boards, you would have to implement own circuit. Maybe look at the schematics of revision D and revision E and try to implement something similar.
Technical support and documentation manager at Olimex

jamin

Ok thank you! I have one more question. When the battery is plugged in and I disconnect the POE power everything shuts off. Does this mean there is an issue with my board? Also do you have a link to the Rev C. schematic so I can review?

LubOlimex

Schematics are available here:

https://github.com/OLIMEX/ESP32-POE/tree/master/HARDWARE

Are you sure everything shuts down or just the LEDs? The design is made so when you operate on battery the LEDs are left unpowered to conserve power. Use another method to determine if the board works on battery.
Technical support and documentation manager at Olimex

jamin

You are correct. I had a couple relays that shut down as well which was something I didn't foresee as I lost the 5 volt section. Thanks for all you help and quick replies!!!!

LubOlimex

Oh yes, for relays on 3.7V battery you might need to think of step-up converter.
Technical support and documentation manager at Olimex

mathewss

I have rev D boards but I am not able to find this jumper. Any chance you can send a picture highlighting it.

Best
 SM