Physical button

PointPubMedia

Hey guys…

Anyone use physical button on a Raspberry Pi … if yes… which one you buy?

lolobyte

Some old reset buttons from scrapped computer.

Works well an they are small.

yawns

@PointPubMedia said in Physical button:

Hey guys…

Anyone use physical button on a Raspberry Pi … if yes… which one you buy?

Try searching for “push button” on ebay or other online shops. Just make sure it is a momentary push putton which does not latch

PointPubMedia

@lolobyte said in Physical button:

Some old reset buttons from scrapped computer.

Works well an they are small.

So that means the maximum is only 1 button ?

Jopyth

@PointPubMedia You can connect multiple buttons to the PI.

PointPubMedia

I got some momentary push button… which pin I need to connect the other cable from the button If I’m using pin 24 ?

EDIT: Should I need to enable something else under raspi-config / interfacing options ?

EDIT2: Make it working fine with one button!

If I’m using more than 1 button, like 24 and 25… can I use the same GND for both ?

lucallmon

@Jopyth how do you control multiple buttons? I have 2 connected but I can only get one to work.

lucallmon

@Jopyth @KirAsh4 I have two buttons set up–1 to shutdown the pi, and another I was hoping to set it up to run “pm2 restart mm” to restart the MM. I have 2 separate .py scripts, 1 for each. And I edited the /etc/rc.local file to run the scripts at startup. I’m not sure what I’m doing wrong though. Here’s my rc.local file:

#!/bin/sh -e
#
# rc.local
#
# This script is executed at the end of each multiuser runlevel.
# Make sure that the script will "exit 0" on success or any other
# value on error.
#
# In order to enable or disable this script just change the execution
# bits.
#
# By default this script does nothing.

# Print the IP address
_IP=$(hostname -I) || true
if [ "$_IP" ]; then
  printf "My IP address is %s\n" "$_IP"
fi

python /home/pi/.sd_button.py,

python /home/pi/.rs_button.py

exit 0

the files .sd and .rs_button.py files are the ones. here is the .py for the shutdown that works on GPIO pin 25 and ground:

#!/bin/python
#This script was authored by AndrewH7 and belongs to him (www.instructables.com/member/AndrewH7)
#You have permission to modify and use this script only for your own personal usage
#You do not have permission to redistribute this script as your own work
#Use this script at your own risk

import RPi.GPIO as GPIO
import os

gpio_pin_number=25
#Replace YOUR_CHOSEN_GPIO_NUMBER_HERE with the GPIO pin number you wish to use
#Make sure you know which rapsberry pi revision you are using first
#The line should look something like this e.g. "gpio_pin_number=7"

GPIO.setmode(GPIO.BCM)
#Use BCM pin numbering (i.e. the GPIO number, not pin number)
#WARNING: this will change between Pi versions
#Check yours first and adjust accordingly

GPIO.setup(gpio_pin_number, GPIO.IN, pull_up_down=GPIO.PUD_UP)
#It's very important the pin is an input to avoid short-circuits
#The pull-up resistor means the pin is high by default

try:
    GPIO.wait_for_edge(gpio_pin_number, GPIO.FALLING)
    #Use falling edge detection to see if pin is pulled
    #low to avoid repeated polling
    os.system("sudo shutdown -h now")
    #Send command to system to reboot
except:
    pass

GPIO.cleanup()
#Revert all GPIO pins to their normal states (i.e. input = safe)

and here is the one that doesn’t work:

#!/bin/python
#This script was authored by AndrewH7 and belongs to him (www.instructables.com/member/AndrewH7)
#You have permission to modify and use this script only for your own personal usage
#You do not have permission to redistribute this script as your own work
#Use this script at your own risk

import RPi.GPIO as GPIO
import os

gpio_pin_number=18
#Replace YOUR_CHOSEN_GPIO_NUMBER_HERE with the GPIO pin number you wish to use
#Make sure you know which rapsberry pi revision you are using first
#The line should look something like this e.g. "gpio_pin_number=7"

GPIO.setmode(GPIO.BCM)
#Use BCM pin numbering (i.e. the GPIO number, not pin number)
#WARNING: this will change between Pi versions
#Check yours first and adjust accordingly

GPIO.setup(gpio_pin_number, GPIO.IN, pull_up_down=GPIO.PUD_UP)
#It's very important the pin is an input to avoid short-circuits
#The pull-up resistor means the pin is high by default

try:
    GPIO.wait_for_edge(gpio_pin_number, GPIO.FALLING)
    #Use falling edge detection to see if pin is pulled
    #low to avoid repeated polling
    os.system("sudo reboot")
    #Send command to system to reboot
except:
    pass

GPIO.cleanup()
#Revert all GPIO pins to their normal states (i.e. input = safe)

it’s essentially the same but it’s in GPIO 18 and ground. Also, I’ve alternated the pin and that didn’t change anything.

Here’s what my pi currently looks like: https://goo.gl/photos/eJrMh8i9ZZHC4RCr8

Any thoughts?

lucallmon

you guys were no help. lol.

This is what fixed it: https://www.raspberrypi.org/forums/viewtopic.php?t=68183&p=497867

Jopyth

@lucallmon said in Physical button:

you guys were no help. lol.

This is what fixed it: https://www.raspberrypi.org/forums/viewtopic.php?t=68183&p=497867

@lucallmon That is just rude and unnecessary in my opinion. Keep in mind that everyone here is doing this voluntarily and (usually) in their free time. Maybe you should not crosspost next time, only discuss problems related to the MagicMirror project and keep a friendly and respectful attitude towards everyone around here.