GP8403 on I2C, no response

boneIO ESP
1

Hi,

This is a continuation of the topic on Discord.

I want to control the GP8403 component (Dfrobot - Gravity: 2-Channel I2C DAC Module (0-10V)) via BoneIO ESP 32x10 Lights.

The board is connected as follows:

  • VDD → 3V3 from the OneWire
  • GND, SCL, SDA from I2C

I’m still having difficulty getting the GP8403 connected over I2C.

  • The I2C resistors are removed on the GP4803 board (R6 and R7).
  • It works on a standalone ESP32 dev kit
  • The address is not showing up during initial scan.

Are there any known issues with I2C, going out of the board?
What voltage is the I2C bus running on?

kind regards,
Jasper

2

Cześć,
GP4803 ma swoją przetwornicę DC prawdopodobnie podanie 3.3V DC jest za małym napięciem aby uruchomić GP4803, spróbuj podać 5V DC z zasilacza.

3

I got it working, I tried a 5v source, but that didn’t work either.
In the end I tried switching the SDA & SCL, which worked (also on 3v). The Dfrobot wiki mentions SDA → SDA & SCL → SCL. But here I had to switch them around.