Traffic Light Project
The 555 astable circuit provides clock pulses for the 4017 counter which has ten outputs (Q0 to Q9).
Each output becomes high in turn as the clock pulses are received.
Appropriate outputs are combined with diodes to supply the amber and green LEDs.
The red LED is connected to the ÷10 output which is high for the first 5 counts (Q0-Q4 high),
this saves using 5 diodes for red and simplifies the circuit.
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