Iliuta Ovidiu Dragos asked 2 days ago
My PIR sensor does not detects motion, in unit 7.4 Motion Detector with Notifications, from Smart_Home ebook.
I used the code provided in ebook. I use the GPIO 4 from ESP 32 for PIR out, VCC to 3v3 ESP PIN, GND to GND. I tried to test the sensor on other simple example and it worked.
Sara Santos Staff answered 1 day ago
Hi.
Can you share with me the example that worked?
Regards,
Sara
Iliuta Ovidiu Dragos answered 1 day ago
Hi, this is the code that works.
Start your code here
#include <Arduino.h>
#include <WiFi.h>
extern "C" {
#include "freertos/FreeRTOS.h"
#include "freertos/timers.h"
}
#include <AsyncMqttClient.h>
#include <Wire.h>
#include <Adafruit_Sensor.h>
#include <Adafruit_BME280.h>
// WiFi
#define WIFI_SSID ""
#define WIFI_PASSWORD ""
// MQTT
#define MQTT_HOST IPAddress()
#define MQTT_PORT 1883
#define BROKER_USER ""
#define BROKER_PASS ""
#define MQTT_PUB_TEMP "esp/bme280/temperature"
#define MQTT_PUB_HUM "esp/bme280/humidity"
#define MQTT_PUB_PRES "esp/bme280/pressure"
#define MQTT_PUB_MOTION "esp/motion/notification"
// PIR
const int PIR_PIN = 4;
// BME280
Adafruit_BME280 bme;
// MQTT
AsyncMqttClient mqttClient;
TimerHandle_t mqttReconnectTimer;
TimerHandle_t wifiReconnectTimer;
// Publish interval
unsigned long previousMillis = 0;
const long interval = 10000;
// PIR debounce
volatile bool pirFlag = false;
volatile unsigned long lastPirTime = 0;
const unsigned long PIR_DEBOUNCE = 2500;
// ===== ISR PIR =====
void IRAM_ATTR detectsMovement() {
unsigned long now = millis();
if (now - lastPirTime > PIR_DEBOUNCE) {
pirFlag = true;
lastPirTime = now;
}
}
// ===== WIFI =====
void connectToWifi() {
Serial.println("Connecting to Wi-Fi...");
WiFi.begin(WIFI_SSID, WIFI_PASSWORD);
}
void WiFiEvent(WiFiEvent_t event) {
Serial.printf("[WiFi-event] event: %d\n", event);
switch(event) {
case ARDUINO_EVENT_WIFI_STA_GOT_IP:
Serial.println("WiFi connected");
Serial.println("IP address: ");
Serial.println(WiFi.localIP());
mqttClient.connect();
break;
case ARDUINO_EVENT_WIFI_STA_DISCONNECTED:
Serial.println("WiFi lost connection");
xTimerStop(mqttReconnectTimer, 0);
xTimerStart(wifiReconnectTimer, 0);
break;
}
}
// ===== MQTT =====
void connectToMqtt() {
Serial.println("Connecting to MQTT...");
mqttClient.connect();
}
void onMqttConnect(bool sessionPresent) {
Serial.println("Connected to MQTT.");
}
void onMqttDisconnect(AsyncMqttClientDisconnectReason reason) {
Serial.println("Disconnected from MQTT.");
if (WiFi.isConnected()) {
xTimerStart(mqttReconnectTimer, 0);
}
}
// ===== SETUP =====
void setup() {
Serial.begin(115200);
Serial.println();
Serial.println();
pinMode(PIR_PIN, INPUT_PULLDOWN);
attachInterrupt(digitalPinToInterrupt(PIR_PIN), detectsMovement, RISING);
if (!bme.begin(0x77)) {
Serial.println("Could not find a valid BME280 sensor!");
while (1);
}
mqttReconnectTimer = xTimerCreate("mqttTimer", pdMS_TO_TICKS(2000), pdFALSE, 0, (TimerCallbackFunction_t)connectToMqtt);
wifiReconnectTimer = xTimerCreate("wifiTimer", pdMS_TO_TICKS(2000), pdFALSE, 0, (TimerCallbackFunction_t)connectToWifi);
WiFi.onEvent(WiFiEvent);
mqttClient.onConnect(onMqttConnect);
mqttClient.onDisconnect(onMqttDisconnect);
mqttClient.setServer(MQTT_HOST, MQTT_PORT);
mqttClient.setCredentials(BROKER_USER, BROKER_PASS);
connectToWifi();
}
// ===== LOOP =====
void loop() {
// ======= PIR MQTT =======
if (pirFlag) {
uint16_t packetIdPub = mqttClient.publish(MQTT_PUB_MOTION, 1, true, "Motion Detected!");
Serial.printf("Publishing on topic %s at QoS 1, packetId: %i Motion Detected! \n", MQTT_PUB_MOTION, packetIdPub);
pirFlag = false;
}
// ======= BME280 MQTT =======
unsigned long currentMillis = millis();
if (currentMillis - previousMillis >= interval) {
previousMillis = currentMillis;
float t = bme.readTemperature();
float h = bme.readHumidity();
float p = bme.readPressure() / 100.0F;
uint16_t id1 = mqttClient.publish(MQTT_PUB_TEMP, 1, true, String(t).c_str());
Serial.printf("Publishing on topic %s at QoS 1, packetId: %iMessage: %.2f \n", MQTT_PUB_TEMP, id1, t);
uint16_t id2 = mqttClient.publish(MQTT_PUB_HUM, 1, true, String(h).c_str());
Serial.printf("Publishing on topic %s at QoS 1, packetId %i: Message: %.2f \n", MQTT_PUB_HUM, id2, h);
uint16_t id3 = mqttClient.publish(MQTT_PUB_PRES, 1, true, String(p).c_str());
Serial.printf("Publishing on topic %s at QoS 1, packetId: %iMessage: %.3f \n", MQTT_PUB_PRES, id3, p);
}
}
Sara Santos Staff answered 5 hours ago
Hi.
That’s weird… because the only thing that you changed seems to be adding a debounce timer to the PIR sensor, and changing the GPIO.
Maybe that GPIO doesn’t work as the one we use in our code (GPIO 26)??…
I’m not sure exactly why the other example didn’t work for you…
Regards,
Sara