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One very interesting application for the Propeller is 1-bit Sigma-Delta
ADC (analog to digital conversion). This is made possible by the high
clock speed.
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1-bit Sigma-Delta (ΣΔ) uses two Prop pins,
one for input, one for output. You also need two resistors and two
capacitors (for DC coupled inputs). |
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Here's a typical setup:
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This
applet can help pick resistor values. |
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I've made an object and VGA demo that utilizes both counters of a cog to
do simultaneous ΣΔ ADC of two inputs:
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Screenshots:
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Download here. |
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