ESP32 3-Channel Power Logger

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Description

Were you ever working on a battery or solar powered project and wanted to know exactly how much current your prototype was using?

The easiest way to measure is to use one of the INA219 or INA3221 modules which can be found for cheap. Unfortunately the modules are flawed and often require modifications in order to work as intended.

This is why i have decided to design and create my own power logger which has way more features than any commercial product. On top of that it is fun and easy to build.

Details

Here are some of the hardware features:

- 3 channel monitoring, with one of the channels having a "USB C to USB A" power monitor (for monitoring a usb device charging for example)

- ESP32 C3 Mini powered, makes it easy to program and interface with

- USB C interface for programming and power

- Micro SD card support for saving logging data (useful for solar power monitoring projects for example)

- Battey support. Contains all necessary components for safe operation on 3.7V battery (overcurrent, over/under charge, LDO for 3.3V).

- TFT Display and buttons for programable interface. This allows the device to be used without needing a serial connection to a laptop in order to read values.

I am writing the software myself in ArduinoIDE and although the final version is not ready yet. here are some of the software features i'd like it to have:

- Easy to use menu to enable/disable channels, set sampling rates, etc.

- The possibility to use 2 channels together to monitor efficiency of devices (for example monitor the input and output of a 5v boost converter)

- Record accurate date/time and values to a microSD card for later review

- Monitor battery level of the power logger itself and alert when low (maybe send an email or MQTT notification)

- Monitor voltage and current levels on any of the 3 channels and send notifications

- Display a bar graph instead of instant values for the past 1/5/15 min

Files

INA3221.h

plain - 9.42 kB - 12/20/2022 at 07:52

Download

ESP32_Power_Meter_SMD_V2.1.rar

Arduino IDE code V2.1 Known bugs: - If you hook the wires in reverse, negative values will be displayed of the screen (which are not aligned properly) - If you monitor a battery and charge it 100mAh and then discharge 100mAh, the calculated energy transfer will be 0

RAR Archive - 15.07 kB - 10/02/2022 at 13:56

Download

BOM_PCB_Power Logger SMD.csv

Power Logger EasyEDA BOM V1

Comma-Separated Values - 7.14 kB - 09/28/2022 at 18:58

Download

PCB_Power Logger SMD.json

Power Logger EasyEDA PCB File V1

JavaScript Object Notation (JSON) - 1.04 MB - 09/28/2022 at 18:18

Download

SCH_Power Logger SMD.json

Power Logger EasyEDA Schematic File V1

JavaScript Object Notation (JSON) - 191.07 kB - 09/28/2022 at 18:16

Download

Components

31 × SMD Resistors Various values

10 × SMD Capacitors Various values

6 × SMD LEDs Various colors

2 × USB-C Female Connector

1 × USB-A Female Connector

Project Logs

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Added Arduino IDE firmware

Ovidiu • 10/02/2022 at 14:00 • 0 comments

Hi guys, please see the attached Arduino IDE firmware.

Use the "ESP32 Lolin C3 Mini" board to program

Added overall steps

Ovidiu • 09/28/2022 at 18:45 • 0 comments

Since this is a DIY project, you may decide to skip of add steps when building this. Just use my general steps as a guide!

Added Schematic and PCB files

Ovidiu • 09/28/2022 at 18:20 • 0 comments

Hi guys, i've just uploaded the easyEDA files which will alow you to reproduce this project

Added Parts List

Ovidiu • 09/28/2022 at 18:12 • 0 comments

Added the most important parts list to the project components.

Build Instructions

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Download and install EasyEDA software

Use the provided schematic and PCB files and import them in EasyEDA

Make any changes if needed

If you'd like to add your own features you could rewire the pins of the ESP32

Order PCB and components

Now is the time to decide if you want to order the PCB with the components already soldered to it.

Discussions

Ethan Johnston wrote 11/16/2023 at 22:49

I have fixed the code to my liking. There were many bugs. Even in the INA3221 driver. Just read the README and modify the code accordingly before use.

https://github.com/ethanajohnston/PowerLoggerPCB_Hackaday

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Jon wrote 04/26/2023 at 09:53

Hmmm, I love the project and building one similar... just one question though, I'm looking at the datasheet and you have an NPN transistor with the collector tied to EN, the emitter to 3.3V, and the base to ground!?

I see that it's not populated in the picture, but can you please explain why that was put in the schematic to begin with? Was it meant to be used for something at some point, or just an oversight that can be removed??

Thanks!

Are you sure? yes | no

spamme wrote 03/30/2023 at 03:09

How many amps and volts can this handle?

Are you sure? yes | no

Ofir wrote 01/28/2023 at 19:23

Hi,

I built the project and it works great! thank you for sharing the design.

I was able to find one issue, If I understand the design correctly you can connect a power source to channel 3 USB C connector and a load to the other channel 3 USB connector but this doesn't seem to work, I think you forgot to connect the - pins of the USB C connector to the ground plane, once I connected them it started working.

thanks again for the great design!

Are you sure? yes | no

artdanion wrote 01/22/2023 at 18:33

Hi, Thank you for This project, I build one and i like it a lot.

btw. ported your code to a platformio project and included a link to this hackaday article in the readme...

artdanion/PowerLogger: ESP32 INA3221 Powerlogger (github.com)

Are you sure? yes | no

Andrea Milocco wrote 01/13/2023 at 15:15

Hi Ovidiu, I need your suggestion. I've found this ESP32-C3-MINI-1-N4 (85 °C version) instead of H4 (105 °C version) from LCSC. Temperature seems to be the only difference. Do you think the 85 °C version could work as well?

Are you sure? yes | no

Ovidiu wrote 01/13/2023 at 15:27

Hello, as far as i remember the only reason i chose the first one was because of the small price difference. So i believe both will work just fine.

If you want to be extra sure just compare the footprint size and pin locations for both versions.

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Andrea Milocco wrote 01/13/2023 at 16:08

Thank you for your suggestion, I'm going to carefully compare both versions!

Are you sure? yes | no

Andrea Milocco wrote 01/08/2023 at 13:12

Hi, I have a question about the PCB: I think it should be better to use spoke pads for GND for better solderability but you didn't, is there a reason for this?

Are you sure? yes | no

Ovidiu wrote 01/08/2023 at 14:07

Hello. Yes there is a reason, i am a beginner and didn't know that 😁

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Andrea Milocco wrote 01/08/2023 at 14:13

this is a good reason :) , but you did an impressive design for a beginner! well done.

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Robin wrote 01/06/2023 at 11:36

I might be missing something but isn't this schematic lacking a power path switch for the battery? The TP4056 module output shall not be connected to the load because that will bypass CC charging detection according to this analysis: https://www.best-microcontroller-projects.com/tp4056.html

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Ovidiu wrote 01/08/2023 at 14:08

Yes you are right, most of the time i use it without a battery anyway.

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jbezza123 wrote 01/04/2023 at 03:41

think i fixed the bugs but will have to check it out as i don't have one,
http://alphaomega.rf.gd/files/ESP32_Power_Meter_SMD_V2.1.ino

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Miklos Vagosr wrote 12/22/2022 at 09:29

Would you attach the compiled .bin file?

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Per Jensen wrote 12/20/2022 at 19:47

For the love of god, fix that typo in the silkscreen "LOGER" :)

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Spehro wrote 11/12/2023 at 15:39

"Lager"

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Ovidiu wrote 09/28/2022 at 18:22

Hello!

Please feel free to download, modify and reproduce this project.

If you don't mind please send some love when you are using my files

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Miklos Vagosr wrote 12/19/2022 at 22:29

Would you attach the INA3221.h file?

Are you sure? yes | no

Ovidiu wrote 12/20/2022 at 07:53

I just did. You can just download the library from the library manager and that would be a lot easier

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ESP32 3-Channel Power Logger

Description

Details