Ili9341 screen flicker

1

I have an ili9341 screen attached to an ESP32 which works fine with no other sensors connected.
But as soon as I connect the MHZ19c the ili9341 screen flickers (dims a little) each time the co2 flashes/updates.

This is how I connected the co2 sensor:

uart:
  rx_pin: GPIO3
  tx_pin: GPIO1
  baud_rate: 9600

sensor:
  - platform: mhz19
    id: master_bedroom_mhz19e
    co2:
      name: "Master Bedroom CO2"
    temperature:
      name: "Master Bedroom MH-Z19E Temperature"
      filters:
      - offset: -3.0
    update_interval: 60s
    automatic_baseline_calibration: true

The screen:

display:
  - platform: ili9341
    model: TFT 2.4
    rotation: 90
    cs_pin: GPIO14 # (Pin on display - CS)
    dc_pin: GPIO27 # (Pin on display - DC)
    led_pin: GPIO32 # (Pin on display - LED)
    reset_pin: GPIO33 # (Pin on display - RESET)
    update_interval: 30s
    id: my_display
    pages: 
      - id: page1....

Anyone have a fix for this?

2

Tried 3 different types of esp32 all the same.
I also tried connecting the vin/gnd from the co2 sensor to a separate esp32 and that fixes it, seems like it only flickers when sharing the 3.3v port on the same esp32

3

Fixed it by connecting the co2 sensor to 5v instead of 3.3v if anyone stumps across the same.