Setup

Published October 2, 2019 © GPL3+

Control the GPIO of a Raspberry Pi using SMS from a mobil...

This is an example of how to use a SMS from a mobile phone to control the GPIO on a Raspberry Pi

IntermediateProtip1 hour27

Control the GPIO of a Raspberry Pi using SMS from a mobil...

Things used in this project

Hardware components

Raspberry Pi Zero

BerryGPS-GSM

Breadboard (generic)

LED (generic)

Story

In this guide we will show you how to control the GPIO pins of a Raspberry pi by send a SMS to the Raspberry Pi from a mobile phone.

For this guide, the GSM modem we are using to receive the SMS is the BerryGPS-GSM.

On the software side, we will be using Gammu, which is specifically designed to control phones and GSM modules. It also has a daemon which will monitor the GSM modem for incoming SMSs.

We will configure Gammu to trigger a python script when a new SMS is received. We will use the contents of the SMS to control what happens in Python

LEDs are used here as an example, but you can do anything you like Eg. Open a garage door, turn on some lights, etc..

Wiring

We will be using the three bottom right GPIO pins on the Raspberry Pi header. These are GPIO 16, 20 and 21.Each is connected to a different color LED as shown above. TheThe resistors used are 330 Ohm and the GND pin (shorter pin) of the LEDs is connected to the GND power rail.

Setup

Install Gammu and python bindings;

 sudo apt-get update
 sudo apt-get install gammu-smsd python-gammu

Edit the config file;

sudo nano /etc/gammu-smsdrc

Find the below lines and add port and speed.For the BerryGPS-GSM, use /dev/ttyACM1 for port and at115200 for speed

port = /dev/ttyACM1 connection = at115200

At the bottom of the file, add the line below. This is the python script which will run when a new SMS is received.

RunOnReceive = sudo python /home/pi/smsReceived.py

We will do a quick test. Restart the gammu service so the new config takes effect;

sudo /etc/init.d/gammu-smsd restart

Send a test SMS to a mobile number. The mobile number below is an example, you will need to update this;

 echo "This is a test from a Raspberry Pi" | /usr/bin/gammu --sendsms TEXT +614123456789

Python Script

This python script will run every time a new SMS is received. Create a new file.

 nano ~/smsReceived.py

Copy in the code attached to this guide.

To troubleshoot you can view the syslog

tail -f /var/log/syslog

Control GPIO pins using SMS and Python

import RPi.GPIO as GPIO
import time
import sys
import re


RED_LED =  21
GREEN_LED =  20
BLUE_LED =  16

GPIO.setmode(GPIO.BCM)
filename=str(sys.argv[1])                               #Gammu will pass the filename of the new SMS as an argument
complete_filename="/var/spool/gammu/inbox/"+filename    #we create the full path to the file here

GPIO.setup(RED_LED , GPIO.OUT)
GPIO.setup(GREEN_LED , GPIO.OUT)
GPIO.setup(BLUE_LED , GPIO.OUT)

sms_file=open(complete_filename,"r")
#read the contents of the SMS file
message=sms_file.read(160) #note that a not-parted SMS can be maximum 160 characters

#search the contents and perform an action. Rather than use 'find',
# we will use regular expression (re) so we can ignore case.
#Most smartphones will have the first letter capitalised
if re.search('red', message, re.IGNORECASE):
        GPIO.output(RED_LED , GPIO.HIGH)
        time.sleep(2)
        GPIO.output(RED_LED , GPIO.LOW)
elif re.search('green', message, re.IGNORECASE):
        GPIO.output(GREEN_LED , GPIO.HIGH)
        time.sleep(2)
        GPIO.output(GREEN_LED , GPIO.LOW)
elif re.search('blue', message, re.IGNORECASE):
        GPIO.output(BLUE_LED , GPIO.HIGH)
        time.sleep(2)
        GPIO.output(BLUE_LED , GPIO.LOW)



GPIO.cleanup()

Control the GPIO of a Raspberry Pi using SMS from a mobil...

Things used in this project

Hardware components

Story

Setup

Code

Control GPIO pins using SMS and Python

Credits

OzzMaker

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Control the GPIO of a Raspberry Pi using SMS from a mobil...

Control the GPIO of a Raspberry Pi using SMS from a mobil...

Things used in this project

Hardware components

Story

Setup

Code

Control GPIO pins using SMS and Python

Credits

OzzMaker

Comments

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