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Extra Sensor Board

Overview

The Extra Sensor Board contains an Atmel AVR AT90S8535 running at 8MHz which just samples up to eight ADC inputs and packages them up into data packets which are sent to the Master Board. The ADC samples the battery voltage as well as temperature sensors and is also capable of handling the tacho signal to relive the master board of this task.

The board is isolated from the Master Board's voltage supply so that it can run with ground at battery earth (as much as possible of the car's system run isolated from both the battery and the chasis for safety).

• CPU Circuit Diagram - including the AT90S8535, reset, SPI, AVcc
• IO Circuit Diagram - including isolating opamps (6N137) and power(NME1205D)
• AREF Circuit Diagram - including the LT1009 2.5V voltage reference
• PCB Picture - a picture of the partially completed board
• PCB Layout - showing the layout of the PCB
• PCB Film - single sided film needed to etch your own board
• Protel Files - all the protel files associated with the board