ADC board work #4
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Failed to order the correct surface mount electrolytics, and put the first one on without even noticing. So now some through holes are bodged in. +5V Power is being injected through the header for that purpose. One op amp's worth of the analog area is populated on the left, so I can check the TIA configuration. fingers crossed on that front. If it doesn't work, we'll go to rev 2 on this rather quickly. |
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An end-to-end test of all of the analog work. The LED power board is driving a CNY70 IR LED + 21 reds. The IR is bouncing off the most IR-reflective thing I could find on my bench, being picked up by the phototransistor, and amplified by the transimpedance amplifier on the ADC board. The multimeter is displaying the measured voltage. distance =~ signal =~ 2V - measured There will be some fine tuning that has to happen as it is installed into a piano/action, but there shouldn't be anything to stop it, now. |
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A rev 1 that's populated enough to confirm everything works. |
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The LEDs are actually pulsing nicely under microcontroller control, but you can't tell, because it isn't video:
Waiting on the arrival of op amps that match the footprint I used, so I can pop a set in over on the left.
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