Turtle Robot

A simple turtle crawler robot.

Used:
* 2x FS90R continuous rotation servos
* 3.7v LiPo
* ESP8266
* ESP8266 battery charging module

Servos wired to D5 and D6 on ESP8266. All power rails wired to 5v. Code creates an open wireless network called turtle ESP8266 opens on ws://192.168.4.1:81 websocket connection for commands. Refer to code for details, but supported commands are:
* f - move forward
* r - right turn
* l - left turn
* s - stop
* h - print help text
* c - show configuration
* rs - set right flipper speed
* ls - set left flipper speed
* rt - set right flipper stop location
* lt - set left flipper stop location
* save - save current configuration

Servo horn is adapted from https://www.thingiverse.com/thing:2132087 by Julesnoble