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=== current state === I have the 555 circuit modelled for a nice rate of flash for the rear LEDs, using 3V. The photoresistor registers about 140k ohms in inside natural light, held under the bike seat. In the bathroom with the door mostly shut, simulating nighttime, it registers 22M. Tentative initial ON value: 20Mohm. Learned a bit of comparator chip circuit theory from David... Have the op amp circuit breadboarded out such that it turns on one LED when the photoresistor is occluded. Circuit includes a pot for calibration, forming the second voltage divider. Notes on my pots: blue pot ranges from 0 ohms to about 2.35k ohms. the pair of leads swap resistance levels compared to the single lead, such that the total resistance is always about 2.35k ohms. When the pot is turned all the way to one side, resistance between the single lead and one of the doubles is 0, and from the single lead to the other of the doubles is 2.35. When it's turned all the way to the other side, the resistances on the double leads, against the single lead, is swapped. Have the 2 circuit bits combined with a transistor, fully functional. Drew circuit diagram & breadboarded additional version from diagram to test diagram; made a couple small corrections. Diagram is correct (possible resistor values s/b changed for optimality as NB supply hadn't anything smaller than 100 ohm).
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