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555 Optical toy car circuit

2017-01-15 01:35  
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555 Optical toy car circuit
As shown in Figure 11-2, IC (555) is connected as dual stable trigger. RG1, RG2 are photoresistors, which are packed in the car's left window and right window (or front and back), when the RG1 is suffered illumination, its resistance declines sharply, pin 6 is in high level, 555 resets, pin 3 is in low level, the motor M reversing and turning right; or turning left.