The device is built around a ESP8266 (ESP-12E actually) and a SSD1306 I2C OLED display. It is battery powered (using a 18650 cell from a dead laptop battery). 2 buttons are used to navigate the interface and activate functions.
I also plan to use an "utility socket" to expand capabilities : https://hackaday.io/project/11869/log/38691-the-utility-socket-explained
Right now, working functions are :
- some nice navigation menus
- analog and digital clock
- gets real temperature using a DS1621 I2C sensor
- connects to known networks
- checks internet connectivity
- gets current time via NTP
- gets weather forecast on timed intervals (using a php script hosted on my home server)
- posts real temperature and voltage to my emoncms server on timed intervals
- shows my 3d printer status : on / off / disconnected, running state, hotend temperature
- gives details about the ESP chip : connectivity, ESSID, IP, free ram, battery voltage...
- On demand "WiFi smart config" : starts an AP and a webserver during 30s, allowing to add new WiFi credentials using a web interface.
- OTA firmware updates
Circuit board still needs some work : it is a prototype on a perfboard, and while it is working, I now want to move to a real PCB. Problem is : I can't find how to export a working gerber from Designspark software...