On-line shopping has changed the way goods are acquired. For most packages it is not necessary to be around for the dropoff. But... for the important stuff it is. Those packages always seem to show up right when you are in the backyard for mere seconds causing that frustrating "Personal Signature Required for Delivery" note on the door. This is our DIY effort to solve that problem.
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Needed:
- ESP8266 (microcontroller with WiFi)
- 1M ohm resistor
- reed switch
- IFTTT account (using the WebHook applet)
- wire and stuff
- fundamental knowledge on Arduino sketches (simple code edits).
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The connections are simple:
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And the rig will look something like this:
A 1M ohm resister connected from 3.3V to the A0 [ADC] input on the ESP8266 keeps the A0 reading at maximum value. The normally open reed switch is placed right on top of the coils that activate the doorbell. These coils act like that electromagnet you build in grade school to ring the doorbell and cause the reed switch to close. This drops the impedance to the 1M resistor and changes the ADC value on the A0 pin for detection of the doorbell. Then the SMS is sent to your phone and a Google Drive Sheet is updated.
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The sketch you need to upload to the the ESP8266 looks like this:
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/*
* FEB2020
* Door Bell Monitoring
* WhiskeyTangoHotel.Com
*
* Build details at:
* http://www.whiskeytangohotel.com/2020/02/esp8266-doorbell-sends-sms-and-updates.html
*
* On Doorbell ring:
* Logs to Google Drive (as an appending spreadsheet)
* Sends SMS to cell phone
*
* ESP8266 uC
*/
// For the Wireless
#include <ESP8266WiFi.h>
// WiFi Connection Information
const char* ssid = "yourssid"; // PRIVATE: Enter your personal setup information.
const char* password = "yourwifipassword"; // PRIVATE: Enter your personal setup information.
// IFTTT Information for WebHook widget
String MAKER_SECRET_KEY = "yourIFTTTprivatekey"; // PRIVATE: Enter your personal setup information. Your IFTTT Webhook key here
String TRIGGER_NAME_google_drive = "googlebell"; // this is the Maker IFTTT trigger name for google drive spreadsheet logging
String TRIGGER_NAME_SMS = "doorbell"; // this is the Maker IFTTT trigger name to send SMS.
const char* host = "maker.ifttt.com";
String url_SMS; // url that gets built for the IFTTT Webhook sending SMS
String url_google_drive; // url that gets built for the IFTTT Webhook logging to google drive spreadsheet
String Status ="**_Starting_on:"; // Status payload for Google Sheet. We log all starts and reboots
// Define and set up some variables
int sensorValue = 0; // reading from A0. This pin detects the doorbell (ADC reading between 0-1024)
// Define pins
const int led = 2; // Blue on board LED is on PIN2. Active LOW. Blinks it between reads
const int bell = A0; // analog input for the doorbell transducer. 1MOhm on board in // with 1MOhm from the reed switch pickup
// Program control variables
int Seconds_dwell_after_detect = 8; // Prevents logging flood and debounce. Sensor reads, LED flashing, etc.
int logging = 1; // If 1 then SMS and log to cloud. Any other value (0) turns it off.
void setup(){ // This is run once.
pinMode(led, OUTPUT); // set up the onbaord LED pin as an output.
Serial.begin(115200); // turn on the serial monitor for debug
// wait until serial port opens for native USB devices
while (! Serial) {
delay(10);
}
// Is the WiFi working?
WiFi.begin(ssid, password);
Serial.println("");
// Wait for connection
while (WiFi.status() != WL_CONNECTED) {
Serial.print("Trying to connect to ");
Serial.print(ssid);
Serial.print(" on ");
Serial.println(WiFi.localIP());
for (int x = 0; x < 20; x++) { //
digitalWrite(led, !digitalRead(led)); // toggle state of the on board blue LED. Shows program is trying to WiFi connect
//Serial.println("Server Start blink loop....");
delay(5); // Delay so short the LED looks like it is always on
} // endfor WiFi blink connect
}
Serial.print("Connected to ");
Serial.println(ssid);
Serial.println(WiFi.localIP());
for (int x = 0; x < 10; x++) { // 5 slow LED blinks to slow WIFI Connected.
digitalWrite(led, !digitalRead(led)); // toggle state of the on board blue LED.
Serial.println("WIFI is Connected....");
delay(500); } // endif for WIFI Connected blink
// Use WiFiClient class to create TCP connections for WiFi logging
WiFiClient client;
const int httpPort = 80;
if (!client.connect(host, httpPort)) {
Serial.println("connection failed"); // Boo!!!
return;
}
// Trigger the IFTTT Webhook Channel to update a Google sheet with the activity of the server starting/restarting
// This can help log power outs, etc. For first run we defined String Status for identify a startup condition.
// Create the request for IFTTT google drive
url_google_drive = "https://maker.ifttt.com/trigger/" + TRIGGER_NAME_google_drive + "/with/key/" + MAKER_SECRET_KEY + "?value1=" + String(Status);
Serial.println (url_google_drive);
Serial.println(" ");
// This sends the request to the IFTTT server
client.print(String("POST ") + url_google_drive + " HTTP/1.1\r\n" +
"Host: " + host + "\r\n" +
"Connection: close\r\n\r\n");
delay(500); // Delay for web traffic; maybe not required.
// Read all the lines of the reply from server and print them to Serial
while(client.available()){
String line = client.readStringUntil('\r'); }
String Status = "Payload_String_for_Google_Sheet";
}
void loop(){ // Loop forever or until the Dallas Cowboys win a Super Bowl
// Read the A0 pin and post based on the delay values set above.
// The blue onboard LED will fast blink while polling
sensorValue = analogRead(bell);
//Serial.println (sensorValue); //debug only
// Fast Blink Blue LED while waiting for doorbell press
digitalWrite(led, !digitalRead(led)); // toggle state of the on board blue LED. Shows program is running
Serial.println("Waiting for DoorBell....");
delay(50);
// Use WiFiClient class to create TCP connections for IFTT
WiFiClient client;
const int httpPort = 80;
if (!client.connect(host, httpPort)) {
Serial.println("connection failed");
return;
}
if (sensorValue < 200 || sensorValue > 300) { // A0 values between 200-300 are normal. Increases (apprx doubles) when DB is pressed
Serial.println("----------Doorbell Dectected----------");
if (logging == 1) { // is logging turned on? Non "1" is for debug... Typically would be set = 1
Serial.println("***** Logging is ON *****");
// Build the IFTTT Webhoo Channel for SMS url
url_SMS = "https://maker.ifttt.com/trigger/" + TRIGGER_NAME_SMS + "/with/key/" + MAKER_SECRET_KEY;
client.print(String("POST ") + url_SMS + " HTTP/1.1\r\n" +
"Host: " + host + "\r\n" +
"Connection: close\r\n\r\n");
Serial.println(" ");
Serial.println("SMS payload to IFTTT is:");
Serial.println(url_SMS);
Serial.println(" ");
// This must be run before any IFTTT webhook
const int httpPort = 80;
if (!client.connect(host, httpPort)) {
Serial.println("connection failed");
return;
}
// Set up IFTTT Webhook Channel to update a Google sheet with the activity.
Status ="__Doorbell_on:";
url_google_drive = "https://maker.ifttt.com/trigger/" + TRIGGER_NAME_google_drive + "/with/key/" + MAKER_SECRET_KEY + "?value1=" + String(Status);
client.print(String("POST ") + url_google_drive + " HTTP/1.1\r\n" +
"Host: " + host + "\r\n" +
"Connection: close\r\n\r\n");
Serial.println(" ");
Serial.println("IFTTT url payload to Google Drive is:");
Serial.println(url_google_drive);
Serial.println(" ");
} else { // We are not sending to IFTTT. Debug mode
Serial.println("Logging is OFF.");
Serial.println(" ");
} // endif/else logging
for (int x = 0; x < Seconds_dwell_after_detect*2; x++) { // DoorBell dectected. Pause and LED flash for visual acknowledgement
digitalWrite(led, !digitalRead(led)); // toggle state of the on board blue LED
Serial.println("Doorbell dectected, Now in BLINK Loop....");
delay(500); } // endfor DoorBell Dwell loop
} // end doorbell A0 pressed
} // end of endless loop
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That's it and thanks for stopping by!!!
