How to connect button to MIO module?

[curious-eng]

I would like to connect a button/switch to RevPi MIO module. How to wire it properly?

[dirk]

Great idea, you can start by this helpful knowledge base article that guides you wring and commissioning:
Commissioning RevPi MIO
And have a look at this video tutorial where we connect a button to a DIO Module - just adapt the steps according to your MIO Module.
Tutorial 12 – Digital IO Modules application example

[curious-eng]

This is helpful. I need additional help with understanding wiring.

To which pins of the MIO module can I safely connect a button or switch? I am looking for a simple diagram similar to this one for Raspberry Pi: https://projects.raspberrypi.org/en/pro ... omputing/5

Can I connect a switch to one of Digital Inputs and the Ground as shown on the attached image?

[dirk]

Hi take a look at this I hope it helps you

May the source be with you

Code: Select all

# toggle RevPi MIO digital output 1
import revpimodio2
import time
rpi = revimodio2.RevPiModIO(autorefresh=True)
OutputValue=True
while True
    rpi.io.DigitalOutput_1.value=OutputValue
    time.sleep(0.5)
    OutputValue = not OutputValue

[dirk]

Hi curious-eng, sorry I forgot to answer your question as I did not have a button around but an LED.

EDIT: However, you have to be aware that your circuit will not work like that. Use 24V between the switch and input 1. So like this:
[24V] - [Switch] - [Input 1]

Open PiCtory and configure the variable of the MIO module "IO_Mode_1" as digital input.
Then save the PiCtory configuration.

Finally, open a shell and type

Code: Select all

piTest -x                # reset piControl
piTest -r DigitalInput_1 # read continously input 1

The value 1/0 should reflect the circuit state closed/opened of your button.

[ptthomps]

Hi, I’d like to add a momentary button in order to trigger a shutdown of the module. Following the information in this thread, does the image below look like it’s wired correctly?

[dirk]

Hello ptthomps, if you have a hardware revision 1.2 then yes, otherwise no. See excerpt from datasheet:

This page describes how to find the serial number. In addition, the revision number: https://revolutionpi.com/en/find-serial ... tem-number

You can find the complete data sheet in the download area
https://revolutionpi.com/en/support/downloads

[ptthomps]

Hello ptthomps, if you have a hardware revision 1.2 then yes, otherwise no. See excerpt from datasheet:
chrome_4jQLaGs2QG.png

This page describes how to find the serial number. In addition, the revision number: https://revolutionpi.com/en/find-serial ... tem-number

You can find the complete data sheet in the download area
https://revolutionpi.com/en/support/downloads

Thanks Dirk. It looks like I DO have revision 1.2 of the MIO module. Out of curiosity, what is the correct configuration for earlier revisions?