Output pin override switch

[Pointy]

Hi,

My project is going to be switching relays via a relay module which is active low. I would like to have manual override switch for each output. Can I simply put a switch between the output pin and ground?

Regards,

Les

 

[Frank B]

Hi,

My project is going to be switching relays via a relay module which is active low. I would like to have manual override switch for each output. Can I simply put a switch between the output pin and ground?

Regards,

Les

You now that you're shorting the pin to ground, otherwise you wouldnt ask..
Maybe you want to add a resistor.

 

[Pointy]

You now that you're shorting the pin to ground, otherwise you wouldnt ask..
Maybe you want to add a resistor.

Sorry, that post was a bit rushed.

I should have said I am using a Teensy 3.1 and should have asked what value resistor to use with the switch.

Regards,

Les

 

[Frank B]

Do you have a datasheet of this module or a schematic ?

 

[Frank B]

Without Resistor:

 

[Pointy]

Do you have a datasheet of this module or a schematic ?

Thanks for your help Frank.

This is the module I am using. It is using Songle SRD-05VDC-SL-C relays.

Here's a schematic I made with my limited eyesight and skills...(not relevant now thanks to your other answer, but it's nice to work how how something is working)

Without Resistor:
View attachment 4521

Thanks, that was the obvious answer, why didn't I think of it?

Regards,

Les

 

[Frank B]

Thanks, that was the obvious answer, why didn't I think of it?

Regards,

Les

I did'nt think of it too, at first.
The variant with the resistor would not work, because the current through the optocoupler would be too low. Maybe with removing/shorting R1 and place it to the other side (input)