I recently started playing with ESP8266 and really like it. So I decided to make a simple OpenSenseMap temperature and pressure ( and humidity with BME280 ) stand-alone device. The idea was to have it run off battery for a long period of time and if needed, to charge it via solar panel(s). I decided to go with ESP-12S, which is bare-bone ESP and does not have usb input or any other schematics like Wemos D1 or similar. That’s the …