Static relay control with GPIO pin

Rodrigue Richalland

Hello,

I want control a static relay with GPIO pin.

My goal is to manage a magnetic lock.

-The input signal is two switch
-I need to define some conditions to power supply the lock
-Meaby a delay a well

I want know if it's possible to do this on my duex 5 and how ?

Thanks
Rodrigue

Phaedrux

Have you seen this? https://docs.duet3d.com/en/User_manual/Connecting_hardware/IO_GPIO

Rodrigue Richalland

@phaedrux Yes i've seen this. But i dont understand how use digital inpout/outpout. Do you have a simple exemple ?

Phaedrux

First you need to choose which pin you want to use. Then define it with the M950 command. Then you can switch it on and off with M42.

There are simple examples on that page.

If you then want to add some conditional logic on how it is controlled you'll have to see here: https://docs.duet3d.com/en/User_manual/Reference/Gcode_meta_commands

Rodrigue Richalland

@Phaedrux

Thanks for your help. I going to try.

Rodrigue Richalland

@Phaedrux
The M950 & M42 need to be writted in config.g ? Or in a standalone config file ?

Phaedrux

@rodrigue-richalland M950 would go in config.g to define the pin you want to use. And then you would use M42 to control the pin in whatever macro you want to use to activate the relay.

Rodrigue Richalland

@phaedrux

I've write this in config.g

M950 P1 C"duex.gp1" Q500
if <"ystop" = 1 >
M98 P"Fermeture_Porte"
else
M98 P"Ouverture_Porte"

The macros are

"Fermeture_Porte"
M42 P1 S1

"Ouverture_Porte"
M42 P1 S0

I think my program is dont correct in config.g. Because the macros works one by one.

I use the ystop for the test. I will change for a other stop after.

Thanks

Phaedrux

@Rodrigue-Richalland said in Static relay control with GPIO pin:

I've write this in config.g

If you want your expression to be checked continuously you need to put it in the daemon.g file which gets run every 10 seconds in the background.

dc42

@Rodrigue-Richalland alternatively, as it looks like you wan to open/close the door depending on the state of the Y endstop pin, use a M581 trigger to monitor the state of that pin.

Rodrigue Richalland

@dc42 @Phaedrux Tanks for your help. I will try

Rodrigue Richalland

@dc42 @Phaedrux
Do you know how it's possible to make infinite loop ?

Phaedrux

I think you'd be better off using a trigger and M581

https://docs.duet3d.com/User_manual/Reference/Gcodes#m581-configure-external-trigger

When the endstop status changes, execute a macro.

T3P3Tony

@Rodrigue-Richalland I agree with @Phaedrux that a trigger is a much better way to do this. If you want something that runs continously then

while 1
...

is sufficient

Rodrigue Richalland

Ok thanks for your reply.
Can you explain me how configure my trigger for :

do "duex.fan3" outpout = 1 when "e2stop" enstop = 1 ?

with "duex.fan3" outpout, i will manage door of the chamber. So this program need to be usable during print as well.

I've dont understand how to do it with trigger.let me know is what file is needed to writte the code. Config.g ? macros ? others ?

Thanks,
Rodrigue

Phaedrux

First you would need to define the pin you want to monitor with an M950 command.

https://docs.duet3d.com/User_manual/Reference/Gcodes#m950-create-heater-fan-spindle-or-gpioservo-pin

Then you would need an M581 command to tell it to watch that pin, and define what to do when it triggers.

https://docs.duet3d.com/User_manual/Reference/Gcodes#m581-configure-external-trigger

In config.g you would have something like

M950 J1 C"e2stop" ; define trigger 1 on e2stop pin
M581 P1 T2 ; watch trigger 1, execute trigger2.g

Then you would need a macro file called trigger2.g in the sys folder. In that macro you would have the commands you want executed when the switch is triggered.

I don't know exactly what you want to happen when the switch is triggered.

Rodrigue Richalland

@Phaedrux

thanks for this quality reply. I going to try this evening.