ESP32 wroom development board. temperature sensor and relay board.

[joelgerardi]

I am trying to make a custom relay board for my pool. I need 30amp relays and a temperature sensor. I have a relay board witch has a 115-5v power supply. I can use this power supply to power the esp32. Doing this i can control all 4 relays with various GPIOs. I also have a ds18b20 temperature sensor connected. GPIO27. It will not work when powering from the relay boards 5v output. I does however work fine when i power the esp32 with a usb. But using the usb, i can not get the relay board to work. The relay board i am using is https://www.amazon.com/dp/B077YLQ6DL?ref_=ppx_hzsearch_conn_dt_b_fed_asin_title_6

[valdus2]

I have almost the same setup and everything works fine...
                                       ->ESP32
                                    /
But, Power Supply ->
                                    \ -> Relay Board

And ds18b20 getting 3.3v from esp32.
(And don't forget to connect a 4.7K pullup resistor from data to 3.3V)