My new project consists of HW with cost under 20€. It is able to accurately measure electric power consumption and sends data via WiFi. Great source of knowledge is openenergymonitor.org which includes also Arduino library.
ESP8266 WiFiManager EEPROM My next addition to previous projects battery-wifi-iot-temp-hum-soil-moisture-sensors and battery-powered-esp8266-iot-logger is to make wifi configuration smooth and fast.
I successfully run DHT22 battery ESP8266 temperature/humidity IoT sensor so my next project is a simple IoT Door Sensor. It is up and running and sending a simple event to my HTTP server via wifi[…]