Montana Mendy Montana Mendy - 2 months ago 25
Python Question

Python (Arduino motion sensor, with SMS notification)

I'm doing a small project I found on GitHub, I have an Arduino Mega 2560, and I'm trying to get an SMS when it detects motion, but I keep getting an error in Python, when I try running the server.

Here's the code:

#!/usr/bin/env python

import serial
import requests
from datetime import datetime, timedelta

# Set the serial port to the same serial port you uploaded the arduino sketch to
# In the Arduino IDE, click "Tools > Serial Port"
# SERIAL_PORT = "/dev/tty.usbserial-A70064Mh"
SERIAL_PORT = "/dev/cu.usbmodem1421"
SERIAL_BAUD = 115200

# Don"t send more than one message every 30 minutes
SENSOR_INTERVAL = timedelta(minutes=30)

SMS_FROM = "" # Make sure this is a number on or you'll get charged extra for spoofing
SMS_TO = ""
SMS_BODY = "ALERT! Your Arduino just detected motion!"

# Try to import TELAPI_ACCOUNT_SID and such from, if it exists
from settings_local import *
except ImportError:


# Start the server
if __name__ == "__main__":
print "Starting SMS motion detector server at",
last_sent_time = None

# Open a serial connection to the Arduino
with serial.Serial(SERIAL_PORT, SERIAL_BAUD) as arduino:
while True:
print "Polling Arduino..."

# Listen for the Arduino to send a byte
byte_received =

print "Received byte:", byte_received

# Motion was detected
if byte_received == "1":
print "Motion detected at",

# If we haven"t sent an SMS in the last 30 minutes, send one now
if not last_sent_time or ( - last_sent_time) > SENSOR_INTERVAL:
last_sent_time =
print "Sending SMS..."

# Send request to TelAPI to send SMS
data = {
"From": SMS_FROM,
"To": SMS_TO,
"Body": SMS_BODY,
}, data=data, auth=(TELAPI_ACCOUNT_SID, TELAPI_TOKEN))

print "** SMS Sent! **"

except Exception as e:
print "Some error occurred while sending SMS:", e

So when I run "python" it gives me this error

Traceback (most recent call last):
File "", line 28, in <module>
TypeError: not all arguments converted during string formatting

Now it looks like TELAPI is no more, but Zang has taken it's place, any help would be appreciated, thank you so much!


I fixed this by replacing the Zang API, with the following


Then of course running, Arduino was able to detect motion and send SMS.