hi blynkers,
I need to detect the room temperature and turn on the fan and need detect the smoke and give a notification included I need to detect the motion and turn on the lights I am also using the eventer to turn on the buzzer all this happen with the blynk app but the code runs well separately but they are not working altogather at the same time temperature works fine only once but it does not show the reading when the temperature is rised
for gas sensor the notification is not coming I am using Arduino uno dht11 t temperature sensor and mq 6 gas sensor the code is here
//code for serial usb
#define BLYNK_PRINT SwSerial
#include <SoftwareSerial.h>
SoftwareSerial SwSerial(10, 11); // RX, TX
#include <BlynkSimpleStream.h>
char auth[] = "dfe8ce156c5a4a1990fb55bb91326ded";
//temperature system initiallization
#define Gate 9
#include <DHT.h>
#define DHTPIN 2
#define DHTTYPE DHT11
DHT dht(DHTPIN, DHTTYPE);
//gas system initialization
int D1 = 7;
int gas_value;
int gas_avalue;
//medical and sprinkler system
BlynkTimer timer;
boolean flag = true;
//lighting system
int led = 13;
int sensor = 3;
int state = LOW;
int val = 0;
//initialization part completed
//temperature operation function
void sendSensor()
{
float h = dht.readHumidity();
float t = dht.readTemperature(); // or dht.readTemperature(true) for Fahrenheit
if (isnan(h) || isnan(t)) {
SwSerial.println("Failed to read from DHT sensor!");
return;
}
// You can send any value at any time.
// Please don't send more that 10 values per second.
Blynk.virtualWrite(V5, h);
Blynk.virtualWrite(V6, t);
}
void fancontrol()
{ float t = dht.readTemperature();
if(t <26 )
{
analogWrite(Gate,0);
}
else if(t==26)
{
analogWrite(Gate, 51);
}
else if(t==27)
{
analogWrite(Gate, 100);
}
else if(t==28)
{
analogWrite(Gate, 800);
}
else if(t==29)
{
analogWrite(Gate, 900);
}
else if(t>29)
{
analogWrite(Gate, 1000);
}
}
//gas operating function
void getsensordata()
{
gas_avalue = digitalRead(7);
if (gas_avalue < 1)
{
Blynk.notify("Danger LPG leak detected");
}
}
//medical and sprinkler system operating function
void sendFlagToServer() {
if (flag) {
Blynk.virtualWrite(V0, 1);
} else {
Blynk.virtualWrite(V0, 0);
}
flag = !flag;
}
BLYNK_WRITE(V1) {
//here you'll get 0 or 255
int ledValue = param.asInt();
}
// pir system working funtion
void lighting()
{
val = digitalRead(sensor); // read sensor value
if (val == HIGH) { // check if the sensor is HIGH
digitalWrite(led, HIGH); // turn LED ON
// delay 100 milliseconds
Serial.println("Motion detected!");
delay(1000);
}
else {
digitalWrite(led, LOW); // turn LED OFF
Serial.println("Motion stopped!");
}}
// working function completed
void setup()
{
// setup
pinMode(Gate,OUTPUT);
digitalWrite(Gate,LOW);
analogWrite(Gate, 0);
pinMode(7, INPUT);
pinMode(led, OUTPUT);
pinMode(sensor, INPUT);
//common
Serial.begin(9600);
SwSerial.begin(9600);
Serial.begin(9600);
Blynk.begin(Serial, auth);
dht.begin();
// Setup a function to be called every second
timer.setInterval(1000L, sendSensor);//temperature function wiil be called
timer.setInterval(1000L, fancontrol);// with temp input fan willl be controlled
timer.setInterval(1000L, getsensordata );//with the the gas sensor input notification will be sent
timer.setInterval(1000L, sendFlagToServer);//with timer in blynk we can set the time for the sprinkler and medicine buzzer
timer.setInterval(1000L,lighting);//pir works
}
void loop()
{
Blynk.run();
timer.run();
}```
Thanks for the reply gunner,
I have made changes to the timer yet the same result. I have to upload the code every single time to see the change in room temperature and still not getting the notification from gas sensor part.
#define BLYNK_PRINT SwSerial
#include <SoftwareSerial.h>
SoftwareSerial SwSerial(10, 11); // RX, TX
#include <BlynkSimpleStream.h>
char auth[] = "dfe8ce156c5a4a1990fb55bb91326ded";
//temperature system initiallization
#define Gate 9
#include <DHT.h>
#define DHTPIN 2
#define DHTTYPE DHT11
DHT dht(DHTPIN, DHTTYPE);
//gas system initialization
int D1 = 7;
int gas_value;
int gas_avalue;
//medical and sprinkler system
BlynkTimer timer;
boolean flag = true;
//lighting system
int led = 13;
int sensor = 3;
int state = LOW;
int val = 0;
//initialization part completed
//temperature operation function
void sendSensor()
{
float h = dht.readHumidity();
float t = dht.readTemperature(); // or dht.readTemperature(true) for Fahrenheit
if (isnan(h) || isnan(t)) {
SwSerial.println("Failed to read from DHT sensor!");
return;
}
// You can send any value at any time.
// Please don't send more that 10 values per second.
Blynk.virtualWrite(V5, h);
Blynk.virtualWrite(V6, t);
}
void fancontrol()
{ float t = dht.readTemperature();
if(t <26 )
{
analogWrite(Gate,0);
}
else if(t==26)
{
analogWrite(Gate, 51);
}
else if(t==27)
{
analogWrite(Gate, 100);
}
else if(t==28)
{
analogWrite(Gate, 800);
}
else if(t==29)
{
analogWrite(Gate, 900);
}
else if(t>29)
{
analogWrite(Gate, 1000);
}
}
//gas operating function
void getsensordata()
{
gas_avalue = digitalRead(7);
//Blynk.notify("danger");
if (gas_avalue < 1)
{
Blynk.notify("Danger LPG leak detected");
}
}
//medical and sprinkler system operating function
void sendFlagToServer() {
if (flag) {
Blynk.virtualWrite(V0, 1);
} else {
Blynk.virtualWrite(V0, 0);
}
flag = !flag;
}
BLYNK_WRITE(V1) {
//here you'll get 0 or 255
int ledValue = param.asInt();
}
// pir system working funtion
void lighting()
{
val = digitalRead(sensor); // read sensor value
if (val == HIGH) { // check if the sensor is HIGH
digitalWrite(led, HIGH); // turn LED ON
// delay 100 milliseconds
Serial.println("Motion detected!");
delay(1000);
}
else {
digitalWrite(led, LOW); // turn LED OFF
Serial.println("Motion stopped!");
}}
// working function completed
void setup()
{
// setup
pinMode(Gate,OUTPUT);
digitalWrite(Gate,LOW);
analogWrite(Gate, 0);
pinMode(7, INPUT);
pinMode(led, OUTPUT);
pinMode(sensor, INPUT);
//common
Serial.begin(9600);
SwSerial.begin(9600);
Serial.begin(9600);
Blynk.begin(Serial, auth);
dht.begin();
// Setup a function to be called every second
timer.setInterval(1000L, sendSensor);//temperature function wiil be called
timer.setInterval(1000L, fancontrol);// with temp input fan willl be controlled
timer.setInterval(2000L, getsensordata );//with the the gas sensor input notification will be sent
timer.setInterval(2500L, sendFlagToServer);//with timer in blynk we can set the time for the sprinkler and medicine buzzer
timer.setInterval(1000L,lighting);//pir works
}
void loop()
{
Blynk.run();
timer.run();
}```
You can’t use your hardware serial for both your Blynk connection and debug messages.
In other areas you’re using software serial for your debugging.
but the motion sensor works properly without any disturbance only the temperature reading is not getting refreshed and when the gas is detected the notification is not coming. but I am able to get the notification for the gas sensor when I tried the program separately.
Both of these functions take a temperature reading, and both are being called at exactly the same time. The DHT sensors are quite slow, and don’t like to be polled that often, so this may be the issue.
Are you getting any “Failed to read from DHT sensor!” messages in your serial monitor?
You should try adding more SwSerial.println commands to track the flow of your program and the variable values at each stage of the process.
@Ashwin_Vvz I guess you didn’t read or understand my linked post… changing a couple of timers from 1000 to 2000 or 2500 still causes them to interfere with each other every 2nd and 5th iteration
