I have designed a circuit and it is working. However, I think it is too complicated and can be changed or simplified. I might be missing something. I am finding hard to create a 1 second delay.
A locomotive has to run, without attention, backwards and forwards along a length of track. At each end it is to stop for about a second before starting in the reverse direction. light dependent resistors (LDR) are used as sensors and they are under the track. The H-bridge has two logic inputs, X and Y, to control the polarity of the track; X high Y low makes the engine move in one direction, X low Y high makes it move the other way. X and Y in the same state disconnect the supply from the track and stops the engine.
I have access to:
- 4016 quad bilateral switch
- 4027 dual J-K master/slave flip-flop
- 4093 quad 2-input Schmitt NAND
- 4520 dual 4-bit up counter
- 4538 dual re-triggable monostable
- DG211 and DG212 quad analogue switch
- 555 timer
Best Answer
That actually looks pretty good, except that you need to add reference designators to your schematic so that we can talk about it.
The main improvement you could make would be to replace your timer circuit (in the bottom center) with one half of a dual monostable.