ESP32-S3 Retrofit for Safer OpenTherm Control
A LOLIN S3 Mini adds Wi-Fi, HTTP, REST, MQTT, and browser control to a PIC-based NodoShop OpenTherm Gateway. This guide checks the hardware, flashes the right firmware, verifies heating data on the local network, and adds optional remote HTTP access only after local testing is complete.
Read the build on localtonet.com: ESP32-S3 Retrofit for Safer OpenTherm ControlFeatured in TinkerNews Issue 37 ·
More ESP32 builds
90 buildsA 3D-Printed Planter That Monitors Indoor CO₂
Behind its geometric planter shell, murCO uses an ESP32-based controller and SCD40 sensor to send local CO₂, temperature, and humidity readings to Home Assistant. LEDs, optional speech, and Bluetooth proxy features make ventilation information useful without depending on a dashboard. The open-source repository and project documentation provide implementation details.
Read the build on openelab.io: A 3D-Printed Planter That Monitors Indoor CO₂Build an ESP32 Sparkle Motion Light
Tiny points of colored light can feel surprisingly alive when they move, fade, and sparkle independently. This project pairs an ESP32-based Adafruit board with addressable LEDs and CircuitPython, giving makers a hands-on way to build an animated display, then adjust its colors, timing, brightness, and physical form.
Read the build on cdn-learn.adafruit.com: Build an ESP32 Sparkle Motion LightReliable ESP-NOW RC Car With ESP32 and ESP8266
At 2.02 volts, a battery pack exposed the gap between firmware’s “protected” message and real electrical safety. This ESP-NOW RC car pairs an ESP32 controller with an ESP8266 vehicle board, then adds packet checks, acknowledgements, failsafes, pairing, and hard-won debugging lessons from actual hardware faults.
Read the build on learniot.in: Reliable ESP-NOW RC Car With ESP32 and ESP8266Build an ESP32 MAX30102 Vital Signs Sensor
Three useful readings come from one fingertip module: heart rate, SpO2, and temperature. This ESP32 project covers the wiring, Arduino sketches, and optical sensing behind each value. It is a practical introduction to I2C and physiological data, but the results are experimental and not suitable for medical diagnosis.
Read the build on randomnerdtutorials.com: Build an ESP32 MAX30102 Vital Signs SensorBuild an ESP32 Cooker Whistle Counter
Pressure-cooker whistles are easy to miss when the kitchen gets busy. This ESP32 project uses a MAX4466 microphone to count sound events, then sends a WhatsApp message through CircuitDigest Cloud when the selected count is reached. It needs careful calibration, reliable Wi-Fi, and continued supervision around the cooker.
Read the build on circuitdigest.com: Build an ESP32 Cooker Whistle CounterESP32 Touchscreen Sonos Wall Panel
On a desk or wall, SonosESP turns a 4-inch or 7-inch touchscreen and ESP32-P4 into a dedicated music remote. It browses libraries, controls speakers across rooms, shows album art and lyrics, displays weather and clocks, and receives firmware updates without being removed from its mounting.
Read the build on github.com: ESP32 Touchscreen Sonos Wall Panel