Ecumaster EMU Classic HD44780 display

Simple "dash" for EMU Classic based on Arduino and HD44780 screen. Connects to EMU serial output on the expansion port.

It is a super inexpensive design, parts in total (without case) should cost less than 50PLN (12 USD).

Preview

Assembled dash

Dash in a car

Elements

• Arduino Nano

  

• HD44780 with I2C interface

  

• MAX3232 RS232<>TTL converter

  

• GX16 5-pin connector

  

Arduino IDE setup

• Install LiquidCrystal_I2C library
• Install EMUSerial library (Note: On Linux You need to modify ~/Arduino/libraries/EMUSerial/src/EMUSerial.h file and replace #include "arduino.h" with #include "Arduino.h")

Hardware connections

Arduino <> Display

Arduino	Display
5V	VCC
GND	GND
A4	SDA
A5	SCL

Arduino <> MAX3232

Arduino	MAX3232 (TTL side)
TX	IN
RX	OUT

EMU <> MAX3232

EMU	MAX3232 (RS232 side)
RXD (pin 1)	OUT
TXD (pin 2)	IN
+3.3V (pin 3)	unused
GND (pin 4)	GND
+5V (pin 5)	VCC

Wiring diagram

Flashing assembled board

You won't be able to flash a fully assembled board due to the way in which TX and RX pins are wired on Arduino.

Before flashing the board, You need to disconnect TX and RX pins from the board.

Case

Case is a FreeCad project that can be 3D printed.

It is designed to fit around a 40 mm roll-cage tube, but this can be easily modified in FreeCad.

Preview

Required hardware

• 4 M4x50 bolts
• 4 M4 nuts