Send a text (SMS) when the button is pressed

After creating a while loop that checks for a button press, add sending an SMS to your code. Instead of printing Button pressed! to the screen, this code sends Button pressed to a cell phone as a text (SMS) message.

To accomplish this, use the sms_send() method, which sends a string to a given phone number. It takes the arguments in the following order:

1. <phone number>
2. <message-to-be-sent>

Before you run this part of the example, you must create a variable that holds the phone number of the cell phone or mobile device you want to receive the SMS.

1. To do this, at the MicroPython >>> prompt, type the following command, replacing 1123456789 with the full phone number (no dashes, spaces, or other symbols) and press Enter:

ph = 1123456789

2. After you create this ph variable with your phone number, copy the code below and enter it into MicroPython using paste mode (Ctrl+E) and then run it.

from machine import Pin
import network # Import network module
import time


c = network.Cellular() # initialize cellular network parameter
dio0 = Pin("D0", Pin.IN, Pin.PULL_UP)
while not c.isconnected():  # While no network connection.
    print("Waiting for connection to cell network...")
    time.sleep(5)
print("Connected.")
# Give feedback to inform user a button press is needed.
print(Waiting for DIO0 press...")
while (True):
    if (dio0.value() == 0):
        
        # When DIO0 is pressed, the module will send an SMS
        # message saying "Button pressed" to the given target cell phone number.
        try:
            c.sms_send(ph, 'Button Pressed')
            print("Sent SMS successfully.")
        except OSError:
            print("ERROR- failed to send SMS.")
        # Exit the WHILE loop.
        break

Note You can easily copy and paste code from the online version of this guide. Use caution with the PDF version, as it may not maintain essential indentations.

Note If you have problems pasting the code, see Syntax error at line 1. For SMS failures, see Error Failed to send SMS.