Maybe this (almost quarter size)? https://hackaday.com/2016/05/10/new-part-day-a-beaglebone-on-a-chip/ https://hackaday.com/2016/05/10/new-part-day-a-beaglebon

Maybe this (almost quarter size)? https://hackaday.com/2016/05/10/new-part-day-a-beaglebone-on-a-chip/ https://hackaday.com/2016/05/10/new-part-day-a-beaglebone-on... But, no wifi. Pair it with a ESP8266? Maybe you can get away with just the ESP8266 and NodeMCU? http://nodemcu.com/index_en.html http://nodemcu.com/index_en.html