First shot at the main box, just been reminded I haven't added a type K thermocouple amplifier yet (Useful enough to dedicate a channel I think). Also remembered I haven't added an audio warning.
So, one of the general purpose 0-5V channels below will become EGT with a typeK thermocouple amplifier.
https://dl.dropbox.com/u/8316230/dash/DigiDashA.pdfThe spec is:
Display 2 line of 16 character alphanumeric (Can arrange a bargraph or 2 on one line) Contrast & backlight adjustable via software.
http://uk.rs-online.com/web/p/lcd-monoc ... s/5326379/SD card (if fitted) - Since these must be 3.3V I added an extra cheap processor to interface to I2C
Built in eeprom logging memory (doesn't get lost if power fails) (alternative to SD)
4x buttons integrated with front panel membrane. Up/down & enter/back.
Box, near single din stereo (same height, 20mm narrower). May also be available in smaller din case but not sure yet.
USB connection to PC.
CANBUS connection for steering display & expansion I/O units (see
viewtopic.php?f=13&t=6277 ) This should also be capable of providing OBD2 to allow use of android / torque or alternatively reading a modern ECU directly without the need to wire all the sensors.
Inputs:
Built in 3 axis G sensor.
Built in battery voltage measurement.
'Breakout loom' connector for vehicle specific loom to standard functions:
SPEED. (5V pulse)
RPM (5V pulse)
FUEL (0-12V analogue)
TEMP (0-5V analogue) - will read ECU sensor, ECU has pullup resistor already
TEMP2 (0-5V analogue) - will read ECU sensor, ECU has pullup resistor already
TEMP3 (0-5V analogue) - will read ECU sensor, ECU has pullup resistor already
BOOST (0-5V analogue) - will read ECU sensor
Expansion connector
5xGeneral purpose 0-5V, can be linked with individual pullup for temperature or resistance measurement.
2xGeneral purpose 0-12V, can be linked with individual pullup for temperature or resistance measurement.
Duplication for speed input (5V pulse)
Duplication for fuel input (0-12V)
Duplication for TEMP3
Duplication for BOOST
4xPullup resistors which can be linked to read resistance or thermistors directly on the 'breakout loom' sensors.
+12V out (protected)
+5V out
So a total of 12 analogue inputs, 3 of which are 0-12V, remainder 0-5V. Configurable to read resistance or thermistors.
A total of 2x Digital inputs.
Software wise, every input will be configurable with name & unit text, scaling values (possibly look up table format). 2 levels of alarm low & high and which level alarm each triggers (low = show on display, med = flash display, sound alarm, high = relay operation)
Selling price for this module looks like it will be somewhere £150 - £250, excluding looms & sensors depending on spec. (+VAT)
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