Abstract

The Heagle project is an attempt to design and build an electric tractor. For this project I am designing an interface between the existing dashboard and the electric motor drive.

Pin out dashboard electric tractor

16 Pin connector

Pin	Color	Function
1
2
3	Yellow/Blue	Temperature
4	Violet	Fuel Gauge
5	Blue/Red	BAT +VE
6	Green	RPM
7	Black	Neutral
8	Black/Yellow	IGN +VE
9
10
11	Green/White	Air filter
12	Yellow/White	Bat. Dischr
13
14
15
16

8 Pin connector

Pin	Color	Function
1	Yellow	Service
2
3
4	Brown/Yellow	Low Oil
5
6
7	Brown	Glow plug
8

RPM meter

The RPM meter can be controlled by applying a square wave signal (0V/5V) with a frequency between 50Hz and 600Hz to pin 6 of the 16 pin dashboard connector.

The tabel below gives the measured values.

RPM (1/min)	Frequency (Hz)
250	55
500	116
750	176
1000	234
1250	294
1500	356
1750	416
2000	476
2250	533
2500	596

There is a linear correlation between RPM and frequency given by the formula:

y = 0.24x - 4

Where y is frequency in Hz and x is RPM

This formula can be simplified to:

frequency = RPM / 4

RPM = 4 x frequency.

Fuel gauge

The fuel gauge is a mechanical balanced coil type meter. With a simple adapter it can be controlled directly by the EMUS G1 BMS. The inverting jumper needs to be installed.

PDF file

License

https://meezenest.nl/mees/

All software is published as open-source software (GPL). All hardware is published as open-source hardware (OSH).

Software

This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

Hardware and documentation

This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.