Out of the box

Do it.

Using ESP32 to upload data into ThingSpeak

Posted on 2026-02-26 by einsamsoldat

ESP32-Wrover does have SPI or SDMMC, that will require additional purchase of modules for the microSD or other SD physical card module.

The need to create proper data acquisition (DAQ) using ESP32-Wrover will be easier by leveraging free service offered by ThingSpeak from Mathlab.

From the previous project https://chow.karmeng.my/2025/03/28/programming-esp32-wrover-with-dht22-am2302-humidity-and-temperature-sensor/ , I am intent to make use of the light sensor. L1B01 light module to collect data of ambience light.

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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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