A montage of projects on various topics
Introduction Honeywell HPMA115SO-XXX and the Plantower PMS1003/5003 particulate matter sensors are nearly identical products. The underlying principal of operation is laser light scattering and its analysis. An internal fan sucks air into a chamber...
Introduction Hardware Programming >>>>>>Main Program >>>>>>Communication With Sensor Via UART Conclusion Introduction I recently came across this interesting CO2 sensor that uses photoacoustic spectroscopy and is not too expensive. The evaluation board that I...
Introduction Hardware Software Results Introduction I have been focussing efforts on building and testing interesting and useful sensors with data sent to the cloud by either esp8266 or ESP32 devices (in one case I...
Elsewhere at this site I have described the GATT Client MQTT Gateway project. There a BLE (Bluetooth Low Energy) server (peripheral device) communicates data to a BLE client (central device) that also acts as...
The ESP8266 SDK comes with a very useful set of examples in the directory IoT_Demo. With it I built and operated some useful devices, namely the DHT11 and DHT22 temperature and humidity sensor and...
With GATT Server Having ADC Sensing The Espressif ESP32-WROOM device has both WIFI and Bluetooth Low Energy (BLE) capability and the ESP-SDK is rich with example code and contains all the libraries necessary to...
