ESP8266 powered by a solar panel and a 18650 battery

On my setup described in here I've added this solar panel from Banggood. If in the past the maximum of battery operated was around 48 ...

BMP180 and wemos D1 reading temperature, pressure and altitude

To read the pressure, temperature and altitude you can use an BMP180 cheap i2c breakout. 1. Materials: Wemos D1 USD 3.99 BMP180 USD 1.97 Tot...