You have an ESP8266 board like the Wemos D1, a Li-Ion battery, you want to build a small battery-powered sensor that wakes up every few minutes to do something, and you don’t want to delve into ...

Connecting your shiny new ESP8266 to WiFi can be as simple ... The trick is to keep ambient light out of the mix. The test sensor shown here places the LDR in a black cap, but [Eduardo] 3D-Printed ...