$5 Wemos D1 mini Pro ESP8266 Board includes 16MB Flash
http://www.cnx-software.com/2016/09/05/5-wemos-d1-mini-pro-esp8266-board-includes-16mb-flash/
$5 Wemos D1 mini Pro ESP8266 Board includes 16MB Flash
http://www.cnx-software.com/2016/09/05/5-wemos-d1-mini-pro-esp8266-board-includes-16mb-flash/