In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Electronegativity wrote:

Hi Steve, right now both SXs are running off the same power supply and share a common ground.

There's no actual schematic of the whole project, and it's pretty involved.

Basically it's an SX28 on a PCB with a MAX7219 display driver, a LTC1298 ADC, 8 digits of 7-segment LED, a potentiometer, and 4 dip switches.
All the remaining pins go out to headers as general purpose I/O. I'll try to get a picture tonight if you want.

Right now it can measure resistance, capacitance, or voltage and display the result.

The plan is to use it as a readout for what other projects are doing so I can see the effects of different hardware or software.
In the current case I want to connect a Memsic accelerometer to the SX52 protoboard and find out how much difference it makes if I sample the 100 Hz duty cycle at 4 or 50 MHz clock speeds, and how much improvement does a crystal give over the built in oscillator.
By displaying the raw data (number of clock cycles that the duty cycle is high) I will be able to directly see the signal to noise ratio.

I think Bean figured it out; the diodes were a mistake and they are causing the voltage to float off the ground because it can't go backwards through the diode.

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