External 5Vdc Switch

[testyourdesign]

@cncnutz

Thanks for sharing that external control circuit for the output pins. Where do you tie in the -ve from the external 5v dc supply?

Quote from @cncnutz " The switch can be either momentary or latching for things like dust collection and coolant pump as you wanted.
The Diode is there to block voltage from going into the Masso TTL output and basically acts as a logic OR gate.
The 5 volt supply can be from a 5 volt voltage regulator, plug in 5 volt power supply or derived from a simple 2 resistor potential divider using the existing Masso Power supply.
When the switch is operated it turns on the TTL device and when off the Masso TTL output will control the device as normal."

Cheers, Stephen Brown

 

[cncnutz]

Hi Shephen

The -ve of the 5 volt supply connects to the -ve of the main power supply.
The diode is critical and protects the Masso TTL output but allows the 5 volt from the output to pass through.

Cheers Peter

 

[testyourdesign]

Thank you, sir. Much appreciated. The new G3 machine control I am building now has seven motor drives, mist, coolant, probe, tool setter, a ten tool umbrella ATC, tower lights, eight external buttons, touch screen, and robot arm controls. I need all the external output buttons you can muster!

Cheers, Stephen Brown

 

[cncnutz]

Hi Shephen

The circuit doesn't give you more outputs but simply allows you to externally turn on an existing output that is off in Masso. eg you have dust collection which turns on while machining but when you finish you want to turn it on again to clean up some more. Instead if using MDI and Gcode to turn it on you can flick a switch to do it. The same applies if you forgot to program dust collection to turn on while running your program you can flick a switch and manually turn it on. Something to note is that if the switch is on Masso cannot turn it off as the switch overrides Masso when turned on.

Cheers Peter

 

[testyourdesign]

I realize that this circuit provides a manual override option to your outputs. I enjoy learning the different types of solutions that can be accomplished using low voltage circuits. This might be old hat to you and Arie but for some of us this is information is gold. You provided an interesting little circuit that could be very beneficial. I appreciate all that you have done for us.

Cheers, Stephen Brown