: Created: 12 May 2019; Last Updated: 05 January 2020

Introduction

This article improves the design earlier shown in "Motion detector with ESP8266 and HC-SR501". The purpose of this device is to allow full usage of the activate and deactivate signal provided by the HC-SR501. This meant that when the status of the HC-SR501 changes (either from active → inactive or inactive → active) the ESP8266 needs to be woken up and transmits the status of the HC-SR501.

Step 1: Designing the trigger electronics

Repeat Trigger (as long as there is motion, the output will be kept high)
Time delay variable
Wakeup needs to occur when output changes
On wakeup state of output needs to be transmitted

The circuit is simulated using: http://www.falstad.com/circuit/circuitjs.html

Code used:

$ 1 0.000001 19.867427341514983 69 5 50
r 336 352 336 448 0 47000
g 336 448 336 464 0
w 528 272 336 272 0
d 176 272 336 272 3 default
r 336 352 432 352 0 47000
w 528 272 528 352 0
I 176 352 272 352 0 0.5 3.3
I 432 352 528 352 0 0.5 3.3
I 96 352 176 352 0 0.5 3.3
w 176 352 176 272 0
c 272 352 336 352 0 1e-7 0.006907472761369231
x -144 332 50 335 4 16 Output\sPIR\sto\sinput\sInverter
x 781 425 921 428 4 16 ESP8266\s\s(RESET)
x 781 446 1001 449 4 12 Do\snot\suse\sGPIO16\s(else\sit\swill\snot\swork)
L 96 352 48 352 0 0 false 3.3 0
x 121 399 167 402 4 12 74HC14
x 573 491 619 494 4 12 74HC08
c 272 592 336 592 0 1e-7 3.293092345850044
w 176 592 176 512 0
I 432 592 528 592 0 0.5 3.3
I 176 592 272 592 0 0.5 3.3
w 528 512 528 592 0
r 336 592 432 592 0 47000
d 176 512 336 512 3 default
w 528 512 336 512 0
g 336 688 336 704 0
r 336 592 336 688 0 47000
w 96 352 96 592 0
w 96 592 176 592 0
150 528 432 672 432 0 2 3.3 3.3
w 528 352 528 416 0
w 528 512 528 448 0
w 96 352 96 224 0
w 96 224 672 224 0
w 672 224 672 320 0
x 776 318 904 321 4 16 ESP8266\sGPIOxx
207 672 432 752 432 0 Reset
207 672 320 752 320 0 Data
x 776 338 883 341 4 12 For\sexample\sGPIO4
o 37 64 0 4099 5 0.00009765625 0 2 37 3
o 36 64 0 4099 5 0.00009765625 0 2 36 3

Step 2: Setting up Domoticz

Same as in previous article.

Step 3: The ESP8266 code

/* PIR Advanced motion Detection with deep-sleep mode */

ADC_MODE(ADC_VCC); //vcc read

#include <ESP8266WiFi.h>
#include <ESP8266HTTPClient.h>

// WiFi credentials & Domoticz API IDX.
const char* WIFI_SSID = "<YOUR_WIFI_SSID>";
const char* WIFI_PASS = "<YOUR_WIFI_PASS>";
const char* DOMOTICZ_SRV = "http://192.168.123.100:8080";
const char* DOMOTICZ_SWITCH_IDX = "45";
const char* DOMOTICZ_VOLT_IDX = "22";
const int PIRSignalPin = 14; //Using GPIO14 for PIR Data

void setup() {
  HTTPClient http;      // HTTP object
  String api;           // Holds full API string for Domoticz
  int httpCode;         // Return HTTP code
  String response;      // Response from HTTP GET request
  float vdd;            // Internal voltage
  String s_vdd;         // Internal voltage (formatted as string)
  
  Serial.begin(115200);
  Serial.setTimeout(2000);

  while (!Serial) { }   // Wait for serial to initialize.
  
  Serial.println("");
  Serial.println("-------------------------------------");
  Serial.println("PIR Motion Detection Firmware!");
  Serial.println("-------------------------------------");

  // Connect to Wifi.
  Serial.print("Connecting to ");
  Serial.print(WIFI_SSID);
  WiFi.begin(WIFI_SSID, WIFI_PASS);

  while (WiFi.status() != WL_CONNECTED) {
    // Check to see if
    if (WiFi.status() == WL_CONNECT_FAILED) {
      Serial.println("");
      Serial.println("Failed to connect to WiFi. Please verify credentials!");
      delay(10000);
    } else {
      delay(500);
      Serial.print(".");
    } 
  }

  Serial.println("");
  Serial.print("WiFi connected with IP address: ");
  Serial.println(WiFi.localIP());

  // Send post request to Domoticz
  Serial.println("");
  
  Serial.println("Sending On signal to Domoticz.");
  //Build API command
  api = DOMOTICZ_SRV;
  api += "/json.htm?type=command&param=switchlight&idx=";
  api += DOMOTICZ_SWITCH_IDX;
  if (digitalRead(PIRSignalPin)==HIGH) {
    api += "&switchcmd=On";
  } else {
    DEBUGPRINTLN0("Sending 'Off' signal to Domoticz.");
    api += "&switchcmd=Off";
  }    
  http.begin(api);                        //Specify request destination
  httpCode = http.GET();                  //Send the request and set return code
  Serial.print("Return code: ");
  Serial.println(httpCode);
  if (httpCode > 0) {                     //Check the returning code  
    response = http.getString();          //Get the request response
    Serial.println("Response:");
    Serial.println(response);
  } 
  http.end();                             //Close connection

  delay(200);

  Serial.print("Sending voltage to Domoticz: ");
  vdd = ESP.getVcc() / 1024.0f;
  s_vdd = String(vdd, 3);
  Serial.println(s_vdd);
 
  api = DOMOTICZ_SRV;
  api += "/json.htm?type=command&param=udevice&idx=";
  api += DOMOTICZ_VOLT_IDX;
  api += "&nvalue=0&svalue=";
  api += s_vdd;
  http.begin(api);                        //Specify request destination
  httpCode = http.GET();                  //Send the request and set return code
  Serial.print("Return code: ");
  Serial.println(httpCode);
  if (httpCode > 0) {                     //Check the returning code  
    response = http.getString();          //Get the request response
    Serial.println("Response:");
    Serial.println(response);
  } 
  http.end();                             //Close connection
  
  Serial.println("");
  Serial.println("Going into deep sleep!");
  ESP.deepSleep(0); // forever

}

void loop() {
  // Never reached!
}

When there is motion detected, the ESP8266 is awoken. It switch on/off command and the voltage is send to the Domoticz server.

Advanced motion detector with ESP8266 and HC-SR501

Introduction

Step 1: Designing the trigger electronics

Step 2: Setting up Domoticz

Step 3: The ESP8266 code

Working device: