Install CircuitPython Code
In the embedded code element below, click on the Download: Project Zip link, and save the .zip archive file to your computer.
Then, uncompress the .zip file, it will unpack to a folder named FONA_SMS_Sensor.
# SPDX-FileCopyrightText: 2020 Brent Rubell for Adafruit Industries
#
# SPDX-License-Identifier: MIT
# pylint: disable=unused-import
import time
import board
import busio
import digitalio
from adafruit_fona.adafruit_fona import FONA
from adafruit_fona.fona_3g import FONA3G
import adafruit_bme280
print("FONA SMS Sensor")
# Create a serial connection for the FONA connection
uart = busio.UART(board.TX, board.RX)
rst = digitalio.DigitalInOut(board.D4)
# Use this for FONA800 and FONA808
fona = FONA(uart, rst)
# Use this for FONA3G
# fona = FONA3G(uart, rst)
# Initialize BME280 Sensor
i2c = busio.I2C(board.SCL, board.SDA)
bme280 = adafruit_bme280.Adafruit_BME280_I2C(i2c)
# Initialize Network
while fona.network_status != 1:
print("Connecting to network...")
time.sleep(1)
print("Connected to network!")
print("RSSI: %ddB" % fona.rssi)
# Enable FONA SMS notification
fona.enable_sms_notification = True
print("Listening for messages...")
while True:
sender, message = fona.receive_sms()
if message:
print("New Message!")
print("FROM: ", sender)
print("MSG: ", message)
# Read BME280 sensor values
temp = bme280.temperature
humid = bme280.humidity
pres = bme280.pressure
# Sanitize message
message = message.lower()
message = message.strip()
if message in ["temp", "temperature", "t"]:
response = "Temperature: %0.1f C" % temp
elif message in ["humid", "humidity", "h"]:
response = "Humidity: %0.1f %%" % humid
elif message in ["pres", "pressure", "p"]:
response = "Pressure: %0.1f hPa" % pres
elif message in ["status", "s"]:
response = "Temperature: {0:.2f}C\nHumidity: {1:.1f}%Pressure: {2:.1f}hPa".format(
temp, humid, pres
)
elif message in ["help"]:
response = "I'm a SMS Sensor - txt me with a command:\
TEMP - Read temperature\
HUMID - Read humidity\
PRES - Read pressure\
STATUS - Read all sensors.\
HELP - List commands"
else:
response = "Incorrect message format received. \
Text HELP to this number for a list of commands."
# Send a response back to the sender
print("Sending response...")
if not fona.send_sms(int(sender), response):
print("SMS Send Failed")
print("SMS Sent!")
Copy the contents of the FONA_SMS_Sensor directory to your PyPortal's CIRCUITPY drive.
This is what the final contents of the CIRCUITPY drive will look like:
Obtain FONA's Number
Next, you'll need your SIM card's phone number. This should be available from your carrier's website. Here's an example of the Ting devices page displaying the FONA's number
After saving the code.py to your board, open the REPL. After the FONA registers with the network, it will output its received signal strength indicator (RSSI) level and display that the FONA is ready to receive messages from your phone.
Text HELP to your device's phone number.
The FONA should reply with a SMS listing all possible commands.
Let's try texting one of the commands. You can read the temperature by texting TEMP to the FONA.
Try this by texting TEMP to the FONA. The FONA will reply with the BME280's temperature reading.
Page last edited January 21, 2025
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