“The limited number (4) of GPIO pins on the ESP8266-01 may seem like an obstacle, for any serious application. Yet if one uses the pins in a smart way it is very well possible to do a lot with only those 4 pins. In some of my recent postings, I have shown the use of a DHT11 a DS18B20, an OLED, an RTC and a BMP180 with the ESP8266-01. In this posting I set out to use 4 sensors and a display, while also uploading the acquired data to Thingspeak. It actually is expanding on a project of monitoring the atmosphere in and around my chicken coop. Yes, you could call this a weatherstation, but it is just to illustrate the use of the 4 pins, you could easily make something else this way”