Techometer for E-Bike

Basic overview of the tachometer controlled by arduino nano. It shows Speed (kmh), Motor Temperature (°C), Distance driven (km), (kmh), time elapsed and Battery Percentage. It also shows some raw output from the VESC.

With the button you can switch between the different information displayed.

Libraries used

• https://github.com/lexus2k/ssd1306 (MIT License)
• https://github.com/SolidGeek/VescUart (GNU v3.0 License)

The ssd1306 is great, becuase it needs very little RAM.

Hardware used

• Arduino Nano (Atmega328p)
• SSD1306 (128x64) Display
• Button

Connections

The used protocol for communicating with the display is SPI. A and B are the opposite connctions on the button.

Display - Arduino

GND  -->  GND
VDD  -->  3v3
SCK  -->  SCK (D13)
SDA  -->  MOSI (D11)
RES  -->  SS (D10)
DC   -->  D9
CS   -->  D8

Vesc - Arduino

5v   -->  5v
GND  -->  GND
TX   -->  RX (D1)
RX   -->  TX (D0)

Button - Arduino

A1   -->  GND (with 10k resistance)
A2   -->  D4
B1   -->  5v5