How to power TCS3472 with ESP32 devkit?

Other Hardware Sensors
1

Hi,
I have a TCS3472 Color sensor board and I want to connect it to ESP32 board.

My ESP32 board is powered with external 5V at 5V input pin.

I know, I could use 3.3V output pin as power supply for TCS3472.
But the ESP32's 3.3V output current is restricted. I need to supply some more sensors!

Now my question:
If I would power the TCS3472 with external 5V at VIN pin, which voltage level will have SDA and SCL? Are they are working at 3.3V in any case or with 5V, when the board is supplied with 5V?

The GPIO pins of ESP32 are just 3.3V. I would damage the ESP32, if SDA/SCL will have 5V.

Many Thanks
Richard

2

If the module has onboard level shifters for 3V3 then 3V3 out otherwise 5V out.

A ESP32 developer module Vreg is rated at 250mA and is to supply the current for the entire ESP32 with every function of the ESP32 enabled.

Are you enabling every ESP32 API function to use 250mA?

The ESP32's GPIO is 3V3, internally the ESP32 runs on 1.8V.

How much current does the TCSthingy module require?

3

Unfortunately I do not know the power consumption of the TCS3472 module.
the "data sheet" is like a joke! :frowning:

5

I measured now.
when I supply 5V to TCS3472's VIN, SDA and SCL have 5V too.
So it seems, I need to use 3.3V from ESP32 board

7

Just search for a better datasheet and you'll get more info.

Looks like the device I/O is 3V3 and takes 5V in but has a 3V3 regulator onboard.

8

I found this schematics now:

but I am not very good in reading schematics! :frowning:

9

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