Controlling model tram

[michaelasc]

@MicroBahner

P.S. what kind of sensor do you plan to recognize when the tram has reached or left a block?

I'm planning on IR sensors. Can't use power detection as only running DC.

@anon57585045

You can use one power bridge as long as everything has the same polarity. Relays can be used as simple switches to connect/disconnect the output from the bridge, to different blocks. The wiring is extremely simple, just use the relay as a switch. However, if you're using this to control train speed, you can't start or stop them with momentum (slowly).

Regarding relays and a bridge, would the following understanding be correct?

1. Arduino controls an H-bridge (298N) with two motor outputs
2. The 298N controls separate momentum and direction for each tram, one going CW (Clockwise) and one going CCW (Counter Clockwise)
3. If I now take the output from each side of the bridge and feed that in as input to relays, are you saying all I need to do is control the LOW/HIGH states for the relays?

If I do the above, how do I selectively choose to turn on output from one side of the bridge to a block, then later choose to the output from the other side of the bridge to the same block, such that tram1 runs CW over the block, and tram2 runs CCW?