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ESPUSB is a software-only USB device stack that adds low-speed USB capability to ESP8266 and ESP8285 microcontrollers. It implements the USB protocol primarily in software instead of relying on dedicated USB hardware. The design needs only a small amount of external circuitry and uses adjacent GPIO pins for the D+ and D- signals. It operates at USB low speed, making it suitable for human-interface devices and control-oriented peripherals.

...It is equipped with a large B/W screen, two buttons, accelerometer, magnitometer, current and voltage sensors, light sensor, internal temperature sensor, battery-backed real-time clock, a buzzer and has connection ports for external speed sensor (motor Hall, phase or reed switch), a Bluetooth SPP dongle, up to three temperature sensors (TMP36, LM35, KTY83 etc), cadence sensor, throttle handle, output to controller throttle input. The project includes: The hardware (schematics & drawings) The firmware (microcontroller program) The software (for mobile phones and PC) Project developement is being tracked (in Russian) here: http://electrotransport.ru/ussr/index.php?...