Publishing messages to MQTT topic using an ESP32

In this example we will connect to an MQTT topic, I used a Wemos Lolin32 - you can use any ESP32 development board We used...

ESP32 and RFID-RC522 module example

In this example we will connect an RFID-RC522 module and connect to an ESP32 Wemos LOLIN32 The microcontroller and card reader uses SPI for communication...

Subscribing to MQTT topic using an ESP32

In this example we will subscribe to an MQTT broker and topic. Again we use the same CloudMQtt, arduino libraries and MQTTlens chrome app that...
ESP32 and AHT20

AHT20 Integrated temperature and humidity Sensor and ESP32 board example

Another day another sensor hits the workshop. In this example we connect a AHT20 Integrated temperature and humidity Sensor to an ESP32 First lets look at...

ESP32 and ADXL345 sensor example

The ADXL345 is a small, thin, low power, 3-axis accelerometer with high resolution (13-bit) measurement at up to ±16g. Digital output data is formatted...

ESP32 and TMP175 digital temperature sensor example

The TMP75 and TMP175 devices are digital temperature sensors ideal for NTC and PTC thermistor replacement. The devices offer a typical accuracy of ±1°C...

ESP32 and RGB led example

In this example we will connect an RGB led to our Wemos MIni, lets look at RGB leds first RGB LEDs consist of one red,...

LOLIN D32 Pro and Barometric Pressure Shield example

In this article we connect a HP303B Barometic shield to a LOLIN D32 Pro, using the new board you can connect them using a...

LPS22HB absolute pressure sensor and ESP32 example

In this article we look at a pressure sensor - this time its the LPS22HB and we will see how we can get this...
esp32 and veml7700 layout

An ESP32 and VEML7700 lux sensor example using the Arduino IDE

In this article we look at the VEML7700  which is an ambient light digital 16-bit resolution sensor - we will take a look at...

ESP32 and OLED display example

This example uses an OLED display these typically come in a couple of different sizes 128x32 and 128x64, this particular example will use the...

ESP32 and CCS811 gas sensor data to Thingspeak example

In this example we connect a CCS811 gas sensor to an ESP32 and then we will upload the data to Thingspeak The CCS811 is a...