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Hello Luke,
Is it possible you are trying to read more pulses than the PIC can keep up with? What is your OSC speed? The wheel I counted had 36 slots . . . 36 * 8,000 = 288,000. Maybe the pulse width is too narrow at high RPM? Also try keeping the sensor in the dark so ambiant light does not weaken your pulse and 60 HZ does not affect it. The 7414 hex inverter has schmitt trigger inputs, probably why they used it.
Last edited by Archangel; - 10th December 2007 at 01:57.
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