ESP32 and CC1101: how to find pinout of ESP32?

ESPHome
1

Dear community,

I use the “AI on the edge”-project to read our water consumption. This works okayish. There are some miss-readings from time to time. I would like to try something else.

I stumbled accross this post by @pazzotranquillo: M-Bus (Meter-Bus) on Raspberry Pi Integration - #16 by pazzotranquillo and I would like to build it myself.

I just found an ESP32 board that I have bought a year ago. Unfortunately, there is no discription of the pinout. I am struggling the find the right pins to use for the CC1101 antenna board.

The antenna board needs the following pins:

  • GND
  • VCC (1.6-3.6V)
  • GD00 (Module information output pin)
  • CSN (Module chip selects the pin used to start an SPI channel)
  • SCK (Module SPI bus clock)
  • MOSI (Module SPI data input pin)
  • MISO/GD01 (Module SPI data output pin)
  • GD02 (Module information output pin)
    (I have found a pinout schema for the antenna.)

This is the board. Can anybody recommend, which pins to connect to?

IMG20251026201637
IMG202510262016371920×3413 560 KB

Any help is very much appreciated.

2

Esp32 board has pins labeled.
Cc1101 doesn’t but it’s like this:

image
image513×362 37.4 KB

For normal esp32 “default” sck=18, mosi=23, miso=19, csn=5.
Gdo0 and gdo2 can be whatever.

3

Hi @Karosm,

thank you for your help. I was able to connect everything. Unfortunately, when compiling my ESPHome yaml, I get errors because of missing dependencies. The owner of the git repository does not has the time ot fix this.

I could try to fix the repo with a little help from an artificial friend - or I could try to build it from scratch based on arduino. Both not an option at the moment.

I will pause my project for now and pick it up some months from now.

Chris

4

Hi,
Thanks for quoting me in your post.

Please find below the link to my Esphome configuration, that I’m running on Esphome 2025.7.5. I believe the component is incompatible with newer versions of Esphome.

I hope that helps.

5

Hi @pazzotranquillo,

thank you for your input. I finally got the code compiled. The main difference was this:

  framework:
    type: arduino

This compiles, but used 97.7% of the available space on the board.

Unfortunately, I just realised that my water meter is “mBus” - and not “wmBus”. :see_no_evil:
To read mBus, I would need some infrared device… so I stick to my AI-on-the-edge project and will redesign my case to reduce reflections.

Chris