LED glowing instead of blinking and Serial.println issue

Projects Programming
1

I don't know how to get the led light to blink instead of glowing. =(
I don't know how to get the serial.println to print " Outside of the normal body temperature " when the temperature it's outside the stated range. Any help or resources would be appreciated. Thanks :slight_smile: :slight_smile: :slight_smile: :). Below is the code :

#include <OneWire.h>
#include <DallasTemperature.h>
 
// Data wire is plugged into pin 2 on the Arduino
#define ONE_WIRE_BUS 2
 
// Setup a oneWire instance to communicate with any OneWire devices 
// (not just Maxim/Dallas temperature ICs)
OneWire oneWire(ONE_WIRE_BUS);
 
// Pass our oneWire reference to Dallas Temperature.
DallasTemperature sensors(&oneWire);

const uint8_t ledPin = 13;                 // LED connected to digital pin 13 

void setup(void)
{
  pinMode(ledPin, OUTPUT);      // sets the digital pin as output

  // start serial port
  Serial.begin(9600);
  Serial.println("Dallas Temperature IC Control Library Demo");

  // Start up the library
  sensors.begin();
}
 
 
void loop(void)
{
  // call sensors.requestTemperatures() to issue a global temperature
  // request to all devices on the bus
  Serial.print(" Celsius Requesting temperature...");
  sensors.requestTemperatures(); // Send the command to get temperatures
  Serial.println("DONE");

  float temp = sensors.getTempCByIndex(0);

  Serial.print(" Core Body Temperature: ");
  Serial.print(temp); 
    // You can have more than one IC on the same bus. 
    // 0 refers to the first IC on the wire

  if (temp < 35 || temp > 39.4)
    digitalWrite(ledPin, HIGH);
  else
    digitalWrite(ledPin, LOW); 
}

[code]

[/code]

2

Try this:

  if (temp < 35 || temp > 39.4){
    digitalWrite(ledPin, HIGH);
Serial.println ("Within range");
}
  else{
    digitalWrite(ledPin, LOW); 
Serial.println ("Outside of range");
}

Where is the blinking to occur?

3

Thanks :slight_smile: , I just want it to blink when the temperature is below 35 or above 39.4

4

To get the LED to blink you need to turn it off also. to adjust the blink rate delay time

if (temp < 35 || temp > 39.4)
    digitalWrite(ledPin, HIGH);
delay(100);
	digitalWrite(ledPin, LOW);
  else
    digitalWrite(ledPin, LOW);
5

Thank you for all your help.
The light is not blinking

#include <OneWire.h>
#include <DallasTemperature.h>
 
// Data wire is plugged into pin 2 on the Arduino
#define ONE_WIRE_BUS 2
 
// Setup a oneWire instance to communicate with any OneWire devices 
// (not just Maxim/Dallas temperature ICs)
OneWire oneWire(ONE_WIRE_BUS);
 
// Pass our oneWire reference to Dallas Temperature.
DallasTemperature sensors(&oneWire);

const uint8_t ledPin = 13;                 // LED connected to digital pin 13 

void setup(void)
{
  pinMode(ledPin, OUTPUT);      // sets the digital pin as output

  // start serial port
  Serial.begin(9600);
  Serial.println("Dallas Temperature IC Control Library Demo");

  // Start up the library
  sensors.begin();
}
 
 
void loop(void)
{
  // call sensors.requestTemperatures() to issue a global temperature
  // request to all devices on the bus
  Serial.print(" Celsius Requesting temperature...");
  sensors.requestTemperatures(); // Send the command to get temperatures
  

  float temp = sensors.getTempCByIndex(0);

 
  Serial.print(temp); 
    // You can have more than one IC on the same bus. 
    // 0 refers to the first IC on the wire

  if (temp < 35 || temp > 39.4){
    digitalWrite(ledPin, HIGH);
    delay(100);
Serial.println ("Celsius, outside normal body temperature range");
}
  else{
    digitalWrite(ledPin, LOW); 
Serial.println ("Celsius, within of normal body temperature range");
}}
[code]

[/code]

6

So turn it on & off a couple times:

else{ 
Serial.println ("Outside of range");
for (byte x=0; x<5; x=x+1){
    digitalWrite(ledPin, HIGH);
delay (100);
    digitalWrite(ledPin, LOW);
delay(100);
}
7

you added the delay but not the line to turn it off.

8

[code][code]whats the line to turn it off????. The following code is not working: [/code]

#include <OneWire.h>
#include <DallasTemperature.h>
 
// Data wire is plugged into pin 2 on the Arduino
#define ONE_WIRE_BUS 2
 
// Setup a oneWire instance to communicate with any OneWire devices 
// (not just Maxim/Dallas temperature ICs)
OneWire oneWire(ONE_WIRE_BUS);
 
// Pass our oneWire reference to Dallas Temperature.
DallasTemperature sensors(&oneWire);

const uint8_t ledPin = 13;                 // LED connected to digital pin 13 

void setup(void)
{
  pinMode(ledPin, OUTPUT);      // sets the digital pin as output

  // start serial port
  Serial.begin(9600);
  Serial.println("Dallas Temperature IC Control Library Demo");

  // Start up the library
  sensors.begin();
}
 
 
void loop(void)
{
  // call sensors.requestTemperatures() to issue a global temperature
  // request to all devices on the bus
  Serial.print(" Requesting temperature...");
  sensors.requestTemperatures(); // Send the command to get temperatures
  
  float temp = sensors.getTempCByIndex(0);

  Serial.print(temp); 
    // You can have more than one IC on the same bus. 
    // 0 refers to the first IC on the wire

  if (temp < 35 || temp > 39.4){
    digitalWrite(ledPin, HIGH);
    delay(1000);
    digitalWrite(ledPin, LOW);    // sets the LED off
   delay(1000);                  // waits for a second
}
    
Serial.println (" Celsius,outside the normal body temperature range");
}
  else{
    digitalWrite(ledPin, LOW); 
Serial.println (" Celsius, within the normal body temperature range");
}
}

[/code]
I get the following error :
message:50: error: expected unqualified-id before 'else'
message:54: error: expected declaration before '}' token

9 
  else{
    digitalWrite(ledPin, LOW); 
Serial.println (" Celsius, within the normal body temperature range");
}
}

This code is outside of the loop() function.