Out of the box

Do it.

Using the ESP32 ESP32S Universal Purple Expansion Board module compatible with 38 pins ESP32 development board

Posted on 2025-04-05 by einsamsoldat

Based on the previous post https://chow.karmeng.my/2025/03/28/programming-esp32-wrover-with-dht22-am2302-humidity-and-temperature-sensor/ , the breadboard that I had purchased has very unreliable connectivity. Resulting in signals from sensor not able to reach the ESP32 microcontroller board.

Upon hours of browsing, discovered expansion board module that is compatible with ESP32 and based on the price it does not break my pocket.

Gotten this cheap from an ecommerce site available in Malaysia

At the time of this post the price point offered is very affordable. I had order 2 pieces of the hardware.

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programming esp32-wrover with DHT22 (AM2302) humidity and temperature sensor

Posted on 2025-03-28 by einsamsoldat

Referring to the original material at ESP32 with DHT11/DHT22 Temperature and Humidity Sensor using Arduino IDE | Random Nerd Tutorials

The reference is straight forward; however, it is not for the esp32-wrover.

Based on the from the reference, using educated guess without reading the specification, it is a hindsight that the original wiring will not work.

Original wiring on the breadboard for the ESP32-wrover, spoiler this is wrong for many reasons

It didn’t work, was getting the error “Failed to read from DHT sensor!” from the sample code.

DHTPIN were used is 4, which I had wrongly assumed it to be the physical pin number. Little did I know that, the reference is referring to GPIO4 instead of the physical pin number.

Based on the reference, ESP32-wrover spec sheet page 9, the physical pin 4 is the SENSOR_VP.

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