speeduino-ardugauge

An OLED gauge for the Speeduino ECU. Uses UART (secondary serial) for communication. See demo video. See screenshots.

NOTE: The gauge shares the same Serial port for communcations with Speeduino ECU and USB connection for programming. Disconnect from the ECU if you wish to upload the Arduino sketch.

Parts List

1. Arduino Nano - should work with most 328P arduino boards
2. Monochrome OLED display - 128x64 px, SSD1306 driver, I2C interface
3. Push button - with optional pull-up resistor.
4. Connector of your choice.

Basic Pinout

Arduino Pin	Connects To
5V	Speeduino 5V
D0-RX	Speeduino TX3
D1-TX	Speeduino RX3
GND	Speeduino GND
5V	OLED 5V
A5	OLED SCL
A4	OLED SDA
GND	OLED GND
D2	Push Button
GND	Push Button

Speeduino Settings

Enable Secondary Serial only. Speeduino Manual

Customizable Pages

The pages displayed and the data within each page are customizable in the ardugauge.ino sketch file. The following is a quick guide on how to modify the pages.

1. The complete dataset is fetched at the start of each loop iteration and stored in a buffer. To get appropriate data, use:

   • getByte(address); - returns numeric value for single byte.
   • getWord(address); - returns numeric value for 2 bytes. Use LB address.
   • getBit(address, bit); - returns bit value for status bytes.

   See Speeduino Manual for the specific address.

   NOTE: The temperature values are in °C and are offset by 40 to maximize single byte range. Subtract 40 from raw value then use appropriate conversion to °F if needed.

2. Create new case for new page. Inside, use one of the following commands:

   • showNumeric(label,value,min,max,decimal); - displays a single numeric value.
   • showBar(label,value,min,max,decimal); - displays a single numeric value with a bar graph.
   • show2Bar(label1,value1,min1,max1,decimal1,...); - displays 2 bar graphs.
   • show4Numeric(label1,value1,min1,max1,decimal1,...); - displays up to 4 numeric values.
   • showFlags(label1,value1,...); - displays up to 8 boolean flags.

   Do not forget to include a break command at the end of each case statement.

3. Update the NUM_PAGES constant in line 5.