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Measure.ino
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Measure.ino
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#include <ESP8266WiFi.h>
#include <Ticker.h>
#include <AsyncMqttClient.h>
#include "HX711.h"
#define WIFI_SSID "home_wg"
#define WIFI_PASSWORD "omisoksbwn"
#define MQTT_HOST IPAddress(192, 168, 0, 7)
#define MQTT_PORT 1883
//Calibration factor for HX711
#define CAL_FACTOR 11280.00 //This value is obtained using the caliberation sketch
#define CONV_FACTOR 0.453592
#define DOUT 13
#define CLK 15
#define RED_L 12
#define YELLOW_L 14
#define _CON_DELAY 20000
#define _THRESHOLD_WEIGHT 20
#define _DETECTION_DELAY 7000
AsyncMqttClient mqttClient;
Ticker mqttReconnectTimer;
WiFiEventHandler wifiConnectHandler;
WiFiEventHandler wifiDisconnectHandler;
Ticker wifiReconnectTimer;
HX711 scale(DOUT, CLK);
int detection_time = 0;
double lastWeight;
char publishValue[10];
double measured_weight ;
boolean break_weight_loop=true;
IPAddress ip(192, 168, 0, 114);
IPAddress gateway_dns(192, 168, 0, 1);
void connectToWifi() {
Serial.println("Connecting to Wi-Fi...");
WiFi.config(ip, gateway_dns, gateway_dns);
WiFi.begin(WIFI_SSID, WIFI_PASSWORD);
}
void onWifiConnect(const WiFiEventStationModeGotIP& event) {
Serial.println("Connected to Wi-Fi.");
connectToMqtt();
}
void onWifiDisconnect(const WiFiEventStationModeDisconnected& event) {
Serial.println("Disconnected from Wi-Fi.");
mqttReconnectTimer.detach(); // ensure we don't reconnect to MQTT while reconnecting to Wi-Fi
wifiReconnectTimer.once(2, connectToWifi);
}
void connectToMqtt() {
Serial.println("Connecting to MQTT...");
mqttClient.connect();
}
void onMqttConnect(bool sessionPresent) {
Serial.println("Connected to MQTT.");
Serial.print("Session present: ");
Serial.println(sessionPresent);
}
void onMqttDisconnect(AsyncMqttClientDisconnectReason reason) {
Serial.println("Disconnected from MQTT.");
if (WiFi.isConnected()) {
mqttReconnectTimer.once(2, connectToMqtt);
}
}
void setup() {
scale.set_scale(CAL_FACTOR);
scale.tare();
scale.power_down();
pinMode(RED_L,OUTPUT);
pinMode(YELLOW_L,OUTPUT);
Serial.begin(115200);
Serial.println();
Serial.println();
wifiConnectHandler = WiFi.onStationModeGotIP(onWifiConnect);
wifiDisconnectHandler = WiFi.onStationModeDisconnected(onWifiDisconnect);
mqttClient.onConnect(onMqttConnect);
mqttClient.onDisconnect(onMqttDisconnect);
mqttClient.setServer(MQTT_HOST, MQTT_PORT);
// mqttClient.setCredentials("user_name","pwd"); //If your <QTT connection needs credentials
connectToWifi();
//Caliberation of HX711
}
void loop() {
scale.power_up();
measured_weight = scale.get_units(10) * CONV_FACTOR; //If you want average weight you can pass the num of iterations in get_units()
if (measured_weight > _THRESHOLD_WEIGHT && ((millis() - detection_time) > _CON_DELAY)) { //Checking millis to avoid repeated publish
// mqttClient.disconnect();
break_weight_loop=true;
Serial.println("Weight detected.");
digitalWrite(RED_L, HIGH);
detection_time = millis();
while (break_weight_loop) {
delay(40);
lastWeight = scale.get_units()* CONV_FACTOR;
if (lastWeight < _THRESHOLD_WEIGHT) {
break_weight_loop = false;
digitalWrite(RED_L, LOW);
}
else
measured_weight=lastWeight;
if (((millis() - detection_time) > _DETECTION_DELAY)) {
break_weight_loop = false;
digitalWrite(RED_L, LOW);
digitalWrite(YELLOW_L, HIGH);
sprintf(publishValue, "%f", measured_weight);
yield();
mqttClient.publish("home/bathroom/scale/weight", 1, true, publishValue);
}
}
}
scale.power_down();
delay(2000);
analogWrite(YELLOW_L, 50);
if(((millis() - detection_time) > _CON_DELAY)) {
delay(500);
digitalWrite(YELLOW_L, LOW);
}
}