Breakout machine limit switch signals

[rauhul]

Find the limit switch signal wires in Merch, spilt them so the rPi can observe this values.

[pwk2]

Y-limit was wrong, correct one has been labeled.

Will now be splitting the wires, does ACM have inline splices or should i join them manually?

I observed the voltage on the two limit switches to be 4.94 on the "20" setting for the multimeter. I don't know if this means ~5 volts or ~10 volts but in either case that voltage will be too much for the RPi, will need help in dealing with that issue.

[abrandemuehl]

Chances are that the limit switch is just a continuity line. Either it is pulled to ground when it is pressed, or it is pulled to power.

You'd have to do some more continuity testing for the limit switches.

[pwk2]

I tested the voltage in the x and y limit switch wires(from motor board to control board) when the motors pull the merch picker to its home position (bottom left). They give no volt reading until the picker reaches the base x or base y (for their respected wires), and then once it is at x=0 or y=0 it gives a constant reading of 4.94 even when the motors are released. So constant voltage indicates that the picker is home, this is sufficient to tracking machine state. Should I split the wires now?

[abrandemuehl]

Just curious, when you say "even when the motors are released", what do you mean?

[pwk2]

When they aren't turning, when the machine isn't giving them power, sorry I'm bad at putting names on things.

[abrandemuehl]

Okay. Makes sense then. The limit switches get pressed when the machine moves to 0,0 and stay pressed until the machine moves away. The limit switches don't really push back, so they won't push the machine off of them.