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Help for first project with Beetle ESP32-C3 + touchscreen + other sensors

userHead Raphael38000 2025-08-29 14:09:35 96 Views1 Replies

Hi,

 

I have a project in which I would like to connect to https://www.dfrobot.com/product-2566.html :

 - This screen (using FPC) : https://wiki.dfrobot.com/3.5inches_480_320_TFT_LCD_Capacitive_Touchscreen_SKU_DFR0669 - Accelerometer + Magnetometer via I2C - Battery voltage check via analog input (using 2 resistor to divide tension)

 

My question(s) : 

 - Using the expansion board, which pins does SDA and SCL on expansion board uses ? 8/9 or 21/22? (Because FPC maps SDA/SCL on 21/22…)

 - Will it work to connect Accelerometer + Magnetometer on SDA/SCL expansion board?

 - Which Pin can I use for analog read for my battery voltage check?

 

Thank you very much!

Raphael

2025-08-29 15:06:38

Just found out, by looking at the plate diagram, that plate expansion board connects SDA/SCL and FPC SDA/SDL to pins 8 and 9

So that answers my first question!

 

Still remaining questions : 

 - Will it work to connect Accelerometer + Magnetometer on SDA/SCL expansion board?

    ==> I guess that will work because they have different adresses

 - Which Pin can I use for analog read for my battery voltage check?

userHeadPic Raphael38000