The idea here is to use as less components as possible to do something useful, for two reasons:
- concentrate on software (you can do almost everything)
- reduce power consumption at a minimum level: 50 uA while deep sleeping and 120 mA for just 2-5 seconds during WiFi transmission.
In my case I got:
- WiFi hostspot to configure WiFi
- WiFi web server
- temperature measurement using DS18B20
- power supply voltage measurement by the internal ADC