[Still need help] Splitting USB power from wall adapter

Projects General Guidance
1

Hi,

Explanation (Questions are at end of post)

I'm planning my first project (I'm a complete beginner with electronics). The idea is to have 2 temperature sensors (BME280), one inside our server cabinet and one outside. I'll be using an ESP32 (for WiFi) which will be outside the server cabinet. But I want to power it from our UPS which is inside the server cabinet and get I2C to the sensor inside the cab. Ideally the power source would be a 5V USB wall adapter (2 to 3 amps).

My plan is to use some USB breakout boards and Adafruit EYESPI FPC cable breakouts so I can feed the flat FPC/ribbon cable through the side of the server cabinet. The EYESPI breakouts are designed for SPI but as far as I can see there are no additional components, just a breakout of the connector so I'm hoping I can use it for this purpose.

I need to take power direct from the power source as well as powering the ESP32 via USB because I want to power up to 4 displays, 2 sensors and a few LEDs which needs too much current.

Here's a basic diagram of what I'm trying to do which will hopefully make more sense.

image
image1920×884 159 KB

Hardware I plan to use:

  1. https://wiki.dfrobot.com/FireBeetle_Board_ESP32_E_SKU_DFR0654 - ESP32
  2. https://learn.adafruit.com/adafruit-bme280-humidity-barometric-pressure-temperature-sensor-breakout - BME280
  3. https://www.adafruit.com/product/5599 - 7 Segment Display
  4. https://www.adafruit.com/product/2717 TCA9548A I2C Multiplexer
  5. https://www.adafruit.com/product/5613 - Adafruit EYESPI Breakout Board - 18 Pin FPC Connector
  6. https://www.adafruit.com/product/5240 - Adafruit 18 pin FPC Cable
  7. https://www.sparkfun.com/products/12700 - SparkFun USB Type A Female Breakout

Questions:

  1. Can I split the power from the USB breakouts like this and still power the ESP32 with a USB A to C cable?
  2. Can I use the EYESPI breakout boards and FPC cables for this purpose?
  3. Are there any other problems which I've missed?

Thanks

2

Could You filter out the question?
Too much material for a cell phone...

3

I've cut it down as much as I can and it's displaying ok on my phone, so hopefully that's better. Thanks.

4

Still no question...
The second picture looks either overdoing things, or a mess.
Focus on what should be done. How to do it can't be that complicated.

EDIT

I2C is a bus. Why 2 of them?

5

The question is will this work? There’s 2 sets of SCL and SDA connections because they’re connected to either end of the FPC breakouts. I.e. two ends of the same connection.

6

I have no opinion.

It doesn't look like "the same connection" to me. Maybe some other helper will get it.

7

I've completely re-written the post. Hopefully it's a lot clearer now. Thanks.

8

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