I have two codes, one for temperature and humidity and another for a buzzer ; both work fine, but how can I combine them so that when the temperature rises, the buzzer activates? i use : esp8266 DHT11 buzzer passive and active

Read this https://forum.arduino.cc/t/beginners-combining-two-codes-doesnt-work/599945 and this [image] How to get the best out of this forum IDE 1.x See also FAQ - Arduino Forum for general rules on forum behaviour and etiquette. Hello, Welcome to the Arduino Forum. This guide explains how to get the best out of this forum. Please read and follow the instructions below. Being new here you might think this is having rules for the sake of rules, but that is not the case. If you don’t follow the guidelines all that happens is there is a long exchange of posts while we try to get you to tell us what we need in order to help you, which is fru…

Hi, Welcome so that we can help you better, I suggest that, using the tags, post both codes that work and your attempt to put the codes together, even if it doesn't work.

[image] nouf9080: another for a buzzer sensor Please explain. What is a "buzzer sensor"? Unless, it will be obvious from the code that you post.

its a passive and active buzzer this is buzzer code on arduino : #define CAYENNE_DEBUG // Uncomment to show debug messages #define CAYENNE_PRINT Serial // Comment this out to disable prints and save space #include // WiFi network info. char ssid[] = "---"; char wifiPassword[] = "---"; // Cayenne authentication info. This should be obtained from the Cayenne Dashboard. char username[] = "---"; char password[] = "---"; char clientID[] = "---"; const unsigned char Passive_buzzer = 2; const unsigned char Active_buzzer = 14; const unsigned char built_in_led = 16; void setup () { pinMode (Passive_buzzer,OUTPUT) ; pinMode (Active_buzzer,OUTPUT) ; pinMode (built_in_led,OUTPUT) ; } void loop () { digitalWrite(built_in_led,LOW) ; //Turn on the built in led digitalWrite(Active_buzzer,HIGH) ; //Turn on active buzzer delay (1000); digitalWrite(built_in_led,HIGH) ; //Turn off the built in led digitalWrite(Active_buzzer,LOW) ; //Turn off active buzzer delay (1000); tone(Passive_buzzer, 523) ; //DO note 523 Hz delay (1000); tone(Passive_buzzer, 587) ; //RE note ... delay (1000); tone(Passive_buzzer, 659) ; //MI note ... delay (1000); tone(Passive_buzzer, 783) ; //FA note ... delay (1000); tone(Passive_buzzer, 880) ; //SOL note ... delay (1000); tone(Passive_buzzer, 987) ; //LA note ... delay (1000); tone(Passive_buzzer, 1046) ; // SI note ... delay (1000); noTone(Passive_buzzer) ; //Turn off the pin attached to the tone() }

and this is DHT11 sensor code: /* Cayenne DHT11 Sensor Project */ #define CAYENNE_PRINT Serial // Comment this out to disable prints and save space #define DHTPIN 0 // D3 // Uncomment whatever type you're using! In this project we used DHT11 #define DHTTYPE DHT11 // DHT 11 //#define DHTTYPE DHT22 // DHT 22, AM2302, AM2321 //#define DHTTYPE DHT21 // DHT 21, AM2301 #include #include // WiFi network info. char ssid[] = "---"; char wifiPassword[] = "---"; // Cayenne authentication info. This should be obtained from the Cayenne Dashboard. char username[] = "---"; char password[] = "---"; char clientID[] = "---"; DHT dht(DHTPIN, DHTTYPE); //Variables for DHT11 values float h; float t; bool humidity = false; bool Temperature = false; void setup() { Serial.begin(9600); Serial.print("Setup"); Cayenne.begin(username, password, clientID, ssid, wifiPassword); humidity = false; Temperature = false; } void loop() { //Run Cayenne Functions Cayenne.loop(); } CAYENNE_OUT(V0){ //Serial.println("humidity"); //Check if read failed and try until success do { //Read humidity (percent) h = dht.readHumidity(); delay(1000); } while (isnan(h)); Serial.print("humidity: "); Serial.println(h); Serial.print(" %\t"); //Set Humidity to true so we know when to sleep humidity = true; //Write to Cayenne Dashboard` Cayenne.virtualWrite(V0, h); } CAYENNE_OUT(V1){ //Serial.println("temperature"); //Check if read failed and try until success do { //Read temperature as Celsius t = dht.readTemperature(); delay(1000); } while (isnan(t)); Serial.print("temperature: "); Serial.println(t); Serial.println(" *C"); //Set Temperature to true so we know when to sleep //Temperature = true; //Write to Cayenne Dashboard Cayenne.virtualWrite(V1, t); }

i need to put if else condition on buzzer code I want to the buzzer to alarm when temp hits a min and a max. It doesn't appear to be reading the temp sensor. all it does is alarm.. this is buzzer code\ :point_down: #define CAYENNE_DEBUG // Uncomment to show debug messages #define CAYENNE_PRINT Serial // Comment this out to disable prints and save space #include // WiFi network info. char ssid[] = "----"; char wifiPassword[] = "---"; // Cayenne authentication info. This should be obtained from the Cayenne Dashboard. char username[] = "--"; char password[] = "---"; char clientID[] = "--"; const unsigned char Passive_buzzer = 2; const unsigned char Active_buzzer = 14; const unsigned char built_in_led = 16; void setup () { pinMode (Passive_buzzer,OUTPUT) ; pinMode (Active_buzzer,OUTPUT) ; pinMode (built_in_led,OUTPUT) ; } void loop () { digitalWrite(built_in_led,LOW) ; //Turn on the built in led digitalWrite(Active_buzzer,HIGH) ; //Turn on active buzzer delay (1000); digitalWrite(built_in_led,HIGH) ; //Turn off the built in led digitalWrite(Active_buzzer,LOW) ; //Turn off active buzzer delay (1000); tone(Passive_buzzer, 523) ; //DO note 523 Hz delay (1000); tone(Passive_buzzer, 587) ; //RE note ... delay (1000); tone(Passive_buzzer, 659) ; //MI note ... delay (1000); tone(Passive_buzzer, 783) ; //FA note ... delay (1000); tone(Passive_buzzer, 880) ; //SOL note ... delay (1000); tone(Passive_buzzer, 987) ; //LA note ... delay (1000); tone(Passive_buzzer, 1046) ; // SI note ... delay (1000); noTone(Passive_buzzer) ; //Turn off the pin attached to the tone() } [image] anon57585045: Read this https://forum.arduino.cc/t/beginners-combining-two-codes-doesnt-work/599945 and this How to get the best out of this forum and this is DHT11 sensor code :point_down: /* Cayenne DHT11 Sensor Project */ #define CAYENNE_PRINT Serial // Comment this out to disable prints and save space #define DHTPIN 0 // D3 // Uncomment whatever type you're using! In this project we used DHT11 #define DHTTYPE DHT11 // DHT 11 //#define DHTTYPE DHT22 // DHT 22, AM2302, AM2321 //#define DHTTYPE DHT21 // DHT 21, AM2301 #include #include // WiFi network info. char ssid[] = "--"; char wifiPassword[] = "--"; // Cayenne authentication info. This should be obtained from the Cayenne Dashboard. char username[] = "---"; char password[] = "---"; char clientID[] = "---"; DHT dht(DHTPIN, DHTTYPE); //Variables for DHT11 values float h; float t; bool humidity = false; bool Temperature = false; void setup() { Serial.begin(9600); Serial.print("Setup"); Cayenne.begin(username, password, clientID, ssid, wifiPassword); humidity = false; Temperature = false; } void loop() { //Run Cayenne Functions Cayenne.loop(); } CAYENNE_OUT(V0){ //Serial.println("humidity"); //Check if read failed and try until success do { //Read humidity (percent) h = dht.readHumidity(); delay(1000); } while (isnan(h)); Serial.print("humidity: "); Serial.println(h); Serial.print(" %\t"); //Set Humidity to true so we know when to sleep humidity = true; //Write to Cayenne Dashboard` Cayenne.virtualWrite(V0, h); } CAYENNE_OUT(V1){ //Serial.println("temperature"); //Check if read failed and try until success do { //Read temperature as Celsius t = dht.readTemperature(); delay(1000); } while (isnan(t)); Serial.print("temperature: "); Serial.println(t); Serial.println(" *C"); //Set Temperature to true so we know when to sleep //Temperature = true; //Write to Cayenne Dashboard Cayenne.virtualWrite(V1, t); }

[image] nouf9080: i need to put if else condition on buzzer code Then make an attempt and post it in a new message. Here is the reference for the 'if' statement: https://www.arduino.cc/reference/en/language/structure/control-structure/if/

[image] nouf9080: I want to the buzzer to alarm when temp hits a min and a max. why not something as simple as this #include #define DHTPIN 0 // D3 #define DHTTYPE DHT11 // DHT 11 DHT dht (DHTPIN, DHTTYPE); const unsigned char Active_buzzer = 14; const float TempMin = 20.0; const float TempMax = 24.0; void setup () { pinMode (Active_buzzer,OUTPUT) ; } void loop () { float t = dht.readTemperature (); if (t < TempMin || TempMax < t) digitalWrite(Active_buzzer, HIGH); // on else digitalWrite(Active_buzzer, LOW); // off }

Hi, try this code: /* Cayenne DHT11 Sensor Project */ const unsigned char Passive_buzzer = 2; const unsigned char Active_buzzer = 14; const unsigned char built_in_led = 16; #define CAYENNE_PRINT Serial // Comment this out to disable prints and save space #define DHTPIN 0 // D3 // Uncomment whatever type you're using! In this project we used DHT11 #define DHTTYPE DHT11 // DHT 11 //#define DHTTYPE DHT22 // DHT 22, AM2302, AM2321 //#define DHTTYPE DHT21 // DHT 21, AM2301 #include #include // WiFi network info. char ssid[] = "--"; char wifiPassword[] = "--"; // Cayenne authentication info. This should be obtained from the Cayenne Dashboard. char username[] = "---"; char password[] = "---"; char clientID[] = "---"; DHT dht(DHTPIN, DHTTYPE); //Variables for DHT11 values float h; float t; float tOld; // Save initial or old read temp. bool humidity = false; bool Temperature = false; //---------------------------------------------------------------------------- void setup() { Serial.begin(9600); Serial.print("Setup"); pinMode (Passive_buzzer, OUTPUT) ; pinMode (Active_buzzer, OUTPUT) ; pinMode (built_in_led, OUTPUT) ; Cayenne.begin(username, password, clientID, ssid, wifiPassword); humidity = false; Temperature = false; tOld = dht.readTemperature(); } //---------------------------------------------------------------------------- void loop() { //Run Cayenne Functions Cayenne.loop(); } CAYENNE_OUT(V0) { //Serial.println("humidity"); //Check if read failed and try until success do { //Read humidity (percent) h = dht.readHumidity(); delay(1000); } while (isnan(h)); Serial.print("humidity: "); Serial.println(h); Serial.print(" %\t"); //Set Humidity to true so we know when to sleep humidity = true; //Write to Cayenne Dashboard` Cayenne.virtualWrite(V0, h); } CAYENNE_OUT(V1) { //Serial.println("temperature"); //Check if read failed and try until success do { //Read temperature as Celsius t = dht.readTemperature(); if ( tOld < t) // If new ra is high then old call buzzer { sound(); // Sound buzzer } tOld = t; // Save new read delay(1000); } while (isnan(t)); Serial.print("temperature: "); Serial.println(t); Serial.println(" *C"); //Set Temperature to true so we know when to sleep //Temperature = true; //Write to Cayenne Dashboard Cayenne.virtualWrite(V1, t); } //---------------------------------------------------------------------------- void sound() { digitalWrite(built_in_led, LOW) ; //Turn on the built in led digitalWrite(Active_buzzer, HIGH) ; //Turn on active buzzer delay (1000); digitalWrite(built_in_led, HIGH) ; //Turn off the built in led digitalWrite(Active_buzzer, LOW) ; //Turn off active buzzer delay (1000); tone(Passive_buzzer, 523) ; //DO note 523 Hz delay (1000); tone(Passive_buzzer, 587) ; //RE note ... delay (1000); tone(Passive_buzzer, 659) ; //MI note ... delay (1000); tone(Passive_buzzer, 783) ; //FA note ... delay (1000); tone(Passive_buzzer, 880) ; //SOL note ... delay (1000); tone(Passive_buzzer, 987) ; //LA note ... delay (1000); tone(Passive_buzzer, 1046) ; // SI note ... delay (1000); noTone(Passive_buzzer) ; //Turn off the pin attached to the tone() }

Connect buzzer to temperature sensor arduino

Projects Programming

anon57585045 January 14, 2023, 1:47pm 2

Read this
https://forum.arduino.cc/t/beginners-combining-two-codes-doesnt-work/599945
and this

Topic		Replies	Views
Help! I'm just a beginner, can someone help me take a look? Thank you! General Guidance	6	196	July 15, 2026
Problème pour brancher 7 sondes DS18B20 sur le même bus Français	107	1738	March 21, 2026
Arduino Temperature and Humidity sensor on LCD and Buzzer General Guidance	7	1073	February 22, 2025
Where do I insert a buzzer code? Programming	8	367	March 5, 2025
At a glance Led temperature gauge DHT11 project Programming	15	709	September 18, 2023

Connect buzzer to temperature sensor arduino

Related topics