Comments on: How to Set Up the DHT11 Humidity Sensor on an Arduino http://www.circuitbasics.com/how-to-set-up-the-dht11-humidity-sensor-on-an-arduino/ Raspberry Pi, Arduino, and DIY Electronics Projects and Tutorials Tue, 23 Jan 2018 14:42:23 +0000 hourly 1 By: Jeremy http://www.circuitbasics.com/how-to-set-up-the-dht11-humidity-sensor-on-an-arduino/#comment-17224 Sun, 07 Jan 2018 09:40:14 +0000 http://www.circuitbasics.com/?p=251022#comment-17224 Hi, is it possible to control a servo motor using the DHT11 humidity sensor?

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By: Ethan http://www.circuitbasics.com/how-to-set-up-the-dht11-humidity-sensor-on-an-arduino/#comment-16574 Sat, 30 Dec 2017 16:19:21 +0000 http://www.circuitbasics.com/?p=251022#comment-16574 Hello,
May I ask why is there a decimal point but the numbers after it are always .00?
Also, I get that every other temp and humidity is -999 if I check at a rate of 1 sec, why is that so and how may I fix it?
Thanks in advance,
Ethan

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By: Matthew http://www.circuitbasics.com/how-to-set-up-the-dht11-humidity-sensor-on-an-arduino/#comment-16440 Fri, 29 Dec 2017 20:23:13 +0000 http://www.circuitbasics.com/?p=251022#comment-16440 Why does my LCD display switch back a forth between 999.000 and the correct measurement?

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By: Jack http://www.circuitbasics.com/how-to-set-up-the-dht11-humidity-sensor-on-an-arduino/#comment-15839 Mon, 25 Dec 2017 02:53:38 +0000 http://www.circuitbasics.com/?p=251022#comment-15839 When I try to compile the sketch, I get the following error messages:
/Resources/Java/libraries/DHTLib/dht.cpp: In member function ‘int dht::_readSensor(uint8_t, uint8_t)’:
/Resources/Java/libraries/DHTLib/dht.cpp:114: error: ‘digitalPinToBitMask’ was not declared in this scope
/Resources/Java/libraries/DHTLib/dht.cpp:115: error: ‘digitalPinToPort’ was not declared in this scope
/Resources/Java/libraries/DHTLib/dht.cpp:116: error: ‘portInputRegister’ was not declared in this scope
Any ideas on how to correct this?
Thanks

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By: Arjun http://www.circuitbasics.com/how-to-set-up-the-dht11-humidity-sensor-on-an-arduino/#comment-13296 Tue, 28 Nov 2017 12:40:40 +0000 http://www.circuitbasics.com/?p=251022#comment-13296 hello, i need some help, i want code for, if i m sending message from mobile (e.g. ABC) to arduino via gsm module then the values of temperature and humidity receiving specific number

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By: Jussi h http://www.circuitbasics.com/how-to-set-up-the-dht11-humidity-sensor-on-an-arduino/#comment-13135 Sat, 25 Nov 2017 21:03:18 +0000 http://www.circuitbasics.com/?p=251022#comment-13135 Hi LM
Sorry, no answer, but I am having the same problem. My board is a Chinese clone of a MEGA2560 that came with a 20$ kit.

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By: aaran http://www.circuitbasics.com/how-to-set-up-the-dht11-humidity-sensor-on-an-arduino/#comment-12456 Tue, 14 Nov 2017 10:54:49 +0000 http://www.circuitbasics.com/?p=251022#comment-12456 Where should I add a float line to get the temp and humidity to read out to 2 decimal places?
What should the line of code be… float…

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By: TEDDY http://www.circuitbasics.com/how-to-set-up-the-dht11-humidity-sensor-on-an-arduino/#comment-12013 Mon, 06 Nov 2017 14:50:49 +0000 http://www.circuitbasics.com/?p=251022#comment-12013 Hi,

I copy the code and the library, but cannot seem to work. Please help. Below are the error.

Arduino: 1.6.6 (Windows 10), Board: “Arduino/Genuino Uno”

WARNING: Spurious .github folder in ‘DHT sensor library’ library
Multiple libraries were found for “dht.h”
Used: C:\Users\Teddy\Documents\Arduino\libraries\DHTLib
Not used: C:\Program Files (x86)\Arduino\libraries\DHTLib

Sketch uses 4,714 bytes (14%) of program storage space. Maximum is 32,256 bytes.
Global variables use 98 bytes (4%) of dynamic memory, leaving 1,950 bytes for local variables. Maximum is 2,048 bytes.
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 1 of 10: not in sync: resp=0xb1
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 2 of 10: not in sync: resp=0xb1
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 3 of 10: not in sync: resp=0xb1
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 4 of 10: not in sync: resp=0xb1
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 5 of 10: not in sync: resp=0xb1
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 6 of 10: not in sync: resp=0xb1
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 7 of 10: not in sync: resp=0xb1
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 8 of 10: not in sync: resp=0xb1
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 9 of 10: not in sync: resp=0xb1
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 10 of 10: not in sync: resp=0xb1
Problem uploading to board. See http://www.arduino.cc/en/Guide/Troubleshooting#upload for suggestions.
WARNING: Spurious .github folder in ‘DHT sensor library’ library
WARNING: Spurious .github folder in ‘DHT sensor library’ library

This report would have more information with
“Show verbose output during compilation”
enabled in File > Preferences.

Regards,
Teddy

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By: MIKI http://www.circuitbasics.com/how-to-set-up-the-dht11-humidity-sensor-on-an-arduino/#comment-10634 Fri, 20 Oct 2017 20:02:39 +0000 http://www.circuitbasics.com/?p=251022#comment-10634 the reason is:

// Make sure we don’t poll the sensor too often
// – Max sample rate DHT11 is 1 Hz (duty cicle 1000 ms)
// – Max sample rate DHT22 is 0.5 Hz (duty cicle 2000 ms)

I’ve managed to pool without -999.00 using 1200ms delay.

See more details at the following link:
http://tsuts.tskoli.is/hopar/ROB2B_H4/arduino-DHT-master/DHT.cpp

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By: mIKI http://www.circuitbasics.com/how-to-set-up-the-dht11-humidity-sensor-on-an-arduino/#comment-10633 Fri, 20 Oct 2017 19:55:10 +0000 http://www.circuitbasics.com/?p=251022#comment-10633 Hi,
I solved the “999” problem by changing the “delay” from 1000 to 2000.
Currently, I am looking for the reason but I think that has something with the reading resolution of the sensor…

BR
Miki

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By: Lars Gimse http://www.circuitbasics.com/how-to-set-up-the-dht11-humidity-sensor-on-an-arduino/#comment-10586 Fri, 20 Oct 2017 07:38:14 +0000 http://www.circuitbasics.com/?p=251022#comment-10586 How to fix this?
Temperature = -999.00
Humidity = -999.00
Temperature = 23.00
Humidity = 27.00

repeating…..

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By: David http://www.circuitbasics.com/how-to-set-up-the-dht11-humidity-sensor-on-an-arduino/#comment-8779 Thu, 28 Sep 2017 11:24:43 +0000 http://www.circuitbasics.com/?p=251022#comment-8779 Is it possible to connect line 3 with dht11?

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By: Hamza http://www.circuitbasics.com/how-to-set-up-the-dht11-humidity-sensor-on-an-arduino/#comment-8313 Tue, 19 Sep 2017 12:21:50 +0000 http://www.circuitbasics.com/?p=251022#comment-8313 Excuse me, what’s the work of line 3 ? “dht DHT;”

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By: Eman Adel Elbehiry http://www.circuitbasics.com/how-to-set-up-the-dht11-humidity-sensor-on-an-arduino/#comment-8138 Mon, 11 Sep 2017 14:52:10 +0000 http://www.circuitbasics.com/?p=251022#comment-8138 How to connect 3 form dht11 together with arduino?

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By: Eman http://www.circuitbasics.com/how-to-set-up-the-dht11-humidity-sensor-on-an-arduino/#comment-7603 Sun, 10 Sep 2017 19:07:02 +0000 http://www.circuitbasics.com/?p=251022#comment-7603 can you connect with me please i need your help
emy_elbehiry@yahoo.com

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By: Maarten http://www.circuitbasics.com/how-to-set-up-the-dht11-humidity-sensor-on-an-arduino/#comment-7593 Sun, 10 Sep 2017 16:36:37 +0000 http://www.circuitbasics.com/?p=251022#comment-7593 Thanks Chetan! That did the trick for me as well! And a big 10Q to Circuit Basics in the first place for all these wonderful tutorials.

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By: LM http://www.circuitbasics.com/how-to-set-up-the-dht11-humidity-sensor-on-an-arduino/#comment-7580 Sun, 10 Sep 2017 14:00:20 +0000 http://www.circuitbasics.com/?p=251022#comment-7580 DId you fix this? I am getting -999 for one second, then the correct readings for another second, flashing between the two.

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By: LM http://www.circuitbasics.com/how-to-set-up-the-dht11-humidity-sensor-on-an-arduino/#comment-7579 Sun, 10 Sep 2017 13:56:28 +0000 http://www.circuitbasics.com/?p=251022#comment-7579 I copied this exactly and got it to display temperature and humidity, but it flashes -999 for temp and -999 for humidity every other second. For example, it will display correct readings for one second, then the -999 for both readings the next second.. Flashing between the two. Any ideas why it might be doing this. I have been playing with the code, rechecking pins, etc, but I cant seem to pinpoint the problem. Any input is appreciated.

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By: gervase http://www.circuitbasics.com/how-to-set-up-the-dht11-humidity-sensor-on-an-arduino/#comment-7120 Sun, 03 Sep 2017 18:35:09 +0000 http://www.circuitbasics.com/?p=251022#comment-7120 I also need to know how to change from celsius to farehneit. As an older generation person, i still don’t always think metric!

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By: Gaganpreet http://www.circuitbasics.com/how-to-set-up-the-dht11-humidity-sensor-on-an-arduino/#comment-7050 Sat, 02 Sep 2017 22:23:17 +0000 http://www.circuitbasics.com/?p=251022#comment-7050 I connected the LCD and the DHT11 and copied and pasted the code. It uploaded and then I look at my LCD and all I see are white boxes on the top of the display. Can anyone help me?

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By: Falah http://www.circuitbasics.com/how-to-set-up-the-dht11-humidity-sensor-on-an-arduino/#comment-7018 Sat, 02 Sep 2017 17:17:14 +0000 http://www.circuitbasics.com/?p=251022#comment-7018 Hello.. can i know how to programme dht11 with basic stamp 2 ?

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By: ulisse http://www.circuitbasics.com/how-to-set-up-the-dht11-humidity-sensor-on-an-arduino/#comment-6770 Wed, 30 Aug 2017 12:24:54 +0000 http://www.circuitbasics.com/?p=251022#comment-6770 How can storage them date on sd-card?

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By: luc.taesch http://www.circuitbasics.com/how-to-set-up-the-dht11-humidity-sensor-on-an-arduino/#comment-6196 Sat, 19 Aug 2017 17:06:42 +0000 http://www.circuitbasics.com/?p=251022#comment-6196 thank you

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By: Dale Bridgford http://www.circuitbasics.com/how-to-set-up-the-dht11-humidity-sensor-on-an-arduino/#comment-5641 Tue, 08 Aug 2017 01:43:35 +0000 http://www.circuitbasics.com/?p=251022#comment-5641 Hi Kevin,

When the DHT11 triggers, do you have your code setting a different pin HI?

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By: kevin f cunningham http://www.circuitbasics.com/how-to-set-up-the-dht11-humidity-sensor-on-an-arduino/#comment-5624 Mon, 07 Aug 2017 18:39:19 +0000 http://www.circuitbasics.com/?p=251022#comment-5624 I have the dht11 reading and printing to lcd and serial monitor.I have the dht11 controlling two relays one for temp and one for humidity.When the relay turns on the dht11 stops sending readings and freezes and stops reading? Any way I can fix that ?thanks

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By: skyfox66 http://www.circuitbasics.com/how-to-set-up-the-dht11-humidity-sensor-on-an-arduino/#comment-4993 Thu, 27 Jul 2017 00:18:32 +0000 http://www.circuitbasics.com/?p=251022#comment-4993 Libraries: dht.h, LiquidCrystal.h

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By: skyfox66 http://www.circuitbasics.com/how-to-set-up-the-dht11-humidity-sensor-on-an-arduino/#comment-4992 Thu, 27 Jul 2017 00:17:16 +0000 http://www.circuitbasics.com/?p=251022#comment-4992 #include
#include

LiquidCrystal lcd(12, 11, 5, 4, 3, 2);

dht DHT;

#define DHT11_PIN 7

void setup(){
lcd.begin(16, 2);
}

void loop()
{
delay(1000); //wait a sec (recommended for DHT11)
int chk = DHT.read11(DHT11_PIN);
switch (chk)

lcd.clear(); //Clears any previous message on LCD
lcd.setCursor(0,0);
lcd.print(“Temp: “);
//lcd.print(DHT.temperature);
//lcd.print(“C”);
lcd.print(DHT.temperature * 1.8 + 32); //Fahrenheit conversion
lcd.print((char)223);
lcd.print(“F”);
lcd.setCursor(0,1);
lcd.print(“Humidity: “);
lcd.print(DHT.humidity);
lcd.print(“%”);

delay(15000); //Shows data for 15 sec then refreshes screen with next line
lcd.clear(); //Clears any previous message on LCD
}

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By: sAM RUFESH http://www.circuitbasics.com/how-to-set-up-the-dht11-humidity-sensor-on-an-arduino/#comment-4202 Tue, 04 Jul 2017 12:29:04 +0000 http://www.circuitbasics.com/?p=251022#comment-4202 Is there any way to change it from Celsius to Fahrenheit?

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By: ishanudayanga http://www.circuitbasics.com/how-to-set-up-the-dht11-humidity-sensor-on-an-arduino/#comment-3531 Mon, 05 Jun 2017 06:51:49 +0000 http://www.circuitbasics.com/?p=251022#comment-3531 please help me.. i won’t get Alarm temperature and humidity..and show in lcd display 16×2.. and changeing temperature, humidity alarm set point HOW IS DO… PLEASE HELP ME.

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By: alon http://www.circuitbasics.com/how-to-set-up-the-dht11-humidity-sensor-on-an-arduino/#comment-2761 Thu, 27 Apr 2017 12:40:33 +0000 http://www.circuitbasics.com/?p=251022#comment-2761 why do you need the pull-up resistor?
let me know if i understant it correctly:
when thre is no communication between the arduino and the dht,the data line is HIGH
to star the communication the arduino will put LOW is the data line,after the transmiting is over the kine will return to HIGH
IS THAT CORRECT???

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By: alon http://www.circuitbasics.com/how-to-set-up-the-dht11-humidity-sensor-on-an-arduino/#comment-2760 Thu, 27 Apr 2017 12:35:06 +0000 http://www.circuitbasics.com/?p=251022#comment-2760 why is the pull-up resistor needed?
let me konw if i understand it correctly:
the logic level on the data pin is HIGH, and that means the arduino and the dht are not communicating.
to start the cummunication the ardduino will give LOW to the data line,after the dht finished the transmition of data,the line will return to HIGH,IS THAT CORRECT???

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By: lala http://www.circuitbasics.com/how-to-set-up-the-dht11-humidity-sensor-on-an-arduino/#comment-2734 Wed, 26 Apr 2017 12:57:16 +0000 http://www.circuitbasics.com/?p=251022#comment-2734 how about the new coding if i add another sensor which is smoke sensor (mq-2). Could you please show me the coding

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By: zoom http://www.circuitbasics.com/how-to-set-up-the-dht11-humidity-sensor-on-an-arduino/#comment-2685 Sun, 23 Apr 2017 08:48:29 +0000 http://www.circuitbasics.com/?p=251022#comment-2685 hey can you pls help me how to use rf module with the above project. i am using two arduino uno, DHT11, LCD, RF transmitter and receiver. please can u give me a code to display temperature and humidity on the receiver side lcd…

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By: viji http://www.circuitbasics.com/how-to-set-up-the-dht11-humidity-sensor-on-an-arduino/#comment-2603 Tue, 18 Apr 2017 13:39:26 +0000 http://www.circuitbasics.com/?p=251022#comment-2603 sir please can you say me why it is responding as board COM1 unvailable

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By: CHETHAN B R http://www.circuitbasics.com/how-to-set-up-the-dht11-humidity-sensor-on-an-arduino/#comment-2571 Sat, 15 Apr 2017 13:38:52 +0000 http://www.circuitbasics.com/?p=251022#comment-2571 hi guys.. i found the bug.. u need to pull up data/out/signal line with 10K to +ve line,

Please do chk with multimeter.. u should get 10K between these two lines.. (S & +)

IN MY CASE IN THE DHT-11 BOARD WRONG RESISTOR WAS SOLDERED, WITHOUT KNOWING TAT I HAD TRIED ALL STUFF, GIVEN 10K PULL UP ADDITIONALLY.. DIDN’T WORKED FINALLY TRACED THE RESISTANCE BETWEEN PINS IT WAS 5 OHMS.. THEN BACK TRACED & REMOVED TAT & PULLED UP WITH 10k SOLVED MY ISSUE.. GUESS U TOO HAVE THE SAME ISSUE.. JUST CHK OUT..

CHETHAN BR

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By: Muhammad Aldrin http://www.circuitbasics.com/how-to-set-up-the-dht11-humidity-sensor-on-an-arduino/#comment-2439 Tue, 04 Apr 2017 23:10:13 +0000 http://www.circuitbasics.com/?p=251022#comment-2439 I have programmed sensor DHT 11 using microcontroller, but i have not tried program this sensor using Arduino

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By: abcd http://www.circuitbasics.com/how-to-set-up-the-dht11-humidity-sensor-on-an-arduino/#comment-2434 Tue, 04 Apr 2017 17:49:38 +0000 http://www.circuitbasics.com/?p=251022#comment-2434 the area of land it measures? approximately

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By: John (@John__Burns) http://www.circuitbasics.com/how-to-set-up-the-dht11-humidity-sensor-on-an-arduino/#comment-2356 Tue, 28 Mar 2017 19:08:17 +0000 http://www.circuitbasics.com/?p=251022#comment-2356 Excellent article! I have a DHT11 on order and will refer to this when I test it out. Thank you so much. Oh.. and have followed on Twitter too!

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By: Robin Cole http://www.circuitbasics.com/how-to-set-up-the-dht11-humidity-sensor-on-an-arduino/#comment-2319 Wed, 15 Mar 2017 19:44:19 +0000 http://www.circuitbasics.com/?p=251022#comment-2319 Would be great to see similar articles featuring MicroPython ?

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By: Mohamed http://www.circuitbasics.com/how-to-set-up-the-dht11-humidity-sensor-on-an-arduino/#comment-2216 Sun, 05 Mar 2017 15:38:09 +0000 http://www.circuitbasics.com/?p=251022#comment-2216 Can someone help me to burn a light if the DHT11 detect something?

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By: Manikanta http://www.circuitbasics.com/how-to-set-up-the-dht11-humidity-sensor-on-an-arduino/#comment-2210 Sat, 04 Mar 2017 17:31:55 +0000 http://www.circuitbasics.com/?p=251022#comment-2210 bro i need some help .i want code for uploading the values read by sensor to web server.

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By: Anna http://www.circuitbasics.com/how-to-set-up-the-dht11-humidity-sensor-on-an-arduino/#comment-2187 Wed, 01 Mar 2017 20:46:43 +0000 http://www.circuitbasics.com/?p=251022#comment-2187 Hi there,

I had en error when I run the first sketch.

Arduino: 1.8.0 (Mac OS X), Board: “Arduino/Genuino Uno”

humidity:22: error: redefinition of ‘dht DHT’
dht DHT;
^
/Users/anna/Documents/Arduino/humidity/humidity.ino:3:5: note: ‘dht DHT’ previously declared here
dht DHT;
^
/Users/anna/Documents/Arduino/humidity/humidity.ino: In function ‘void setup()’:
humidity:26: error: redefinition of ‘void setup()’
void setup(){
^
/Users/anna/Documents/Arduino/humidity/humidity.ino:7:6: note: ‘void setup()’ previously defined here
void setup(){
^
/Users/anna/Documents/Arduino/humidity/humidity.ino: In function ‘void loop()’:
humidity:30: error: redefinition of ‘void loop()’
void loop()
^
/Users/anna/Documents/Arduino/humidity/humidity.ino:11:6: note: ‘void loop()’ previously defined here
void loop()
^
exit status 1
redefinition of ‘dht DHT’

This report would have more information with
“Show verbose output during compilation”
option enabled in File -> Preferences.

What can I do?

Thanks!

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By: Boulossss http://www.circuitbasics.com/how-to-set-up-the-dht11-humidity-sensor-on-an-arduino/#comment-2184 Wed, 01 Mar 2017 10:39:54 +0000 http://www.circuitbasics.com/?p=251022#comment-2184 Hi, Is there a way to send alerts to an email address if the temperature and humidity is above a certain value?

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By: D r SOLANKE http://www.circuitbasics.com/how-to-set-up-the-dht11-humidity-sensor-on-an-arduino/#comment-2175 Mon, 27 Feb 2017 09:30:12 +0000 http://www.circuitbasics.com/?p=251022#comment-2175 I AM GETTING ERROR WHILE COMPILING THE PROGRA CODE

“avrdude: stk500_getsync(): not in sync: resp=0x00”

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By: Circuit Basics http://www.circuitbasics.com/how-to-set-up-the-dht11-humidity-sensor-on-an-arduino/#comment-2174 Mon, 27 Feb 2017 09:24:34 +0000 http://www.circuitbasics.com/?p=251022#comment-2174 We have a tutorial on that too: http://www.circuitbasics.com/how-to-set-up-the-dht11-humidity-sensor-on-the-raspberry-pi/

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By: Circuit Basics http://www.circuitbasics.com/how-to-set-up-the-dht11-humidity-sensor-on-an-arduino/#comment-2173 Mon, 27 Feb 2017 09:23:36 +0000 http://www.circuitbasics.com/?p=251022#comment-2173 Hi Kachi, I believe this is a problem with an updated version of the DHTLib library (version 0.1.21). If you download the library from this post (it’s version 0.1.14) instead of from github it should work.

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By: D r SOLANKE http://www.circuitbasics.com/how-to-set-up-the-dht11-humidity-sensor-on-an-arduino/#comment-2172 Mon, 27 Feb 2017 08:30:08 +0000 http://www.circuitbasics.com/?p=251022#comment-2172 where should i 11 get dht11 library version 0.1.14?

pls reply..

thanks

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By: Circuit Basics http://www.circuitbasics.com/how-to-set-up-the-dht11-humidity-sensor-on-an-arduino/#comment-2171 Mon, 27 Feb 2017 05:55:43 +0000 http://www.circuitbasics.com/?p=251022#comment-2171 Try using the library in the zip file from the post (version 0.1.14). It sounds like you’re using the newer version (0.1.21) that is having some problems…

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By: Circuit Basics http://www.circuitbasics.com/how-to-set-up-the-dht11-humidity-sensor-on-an-arduino/#comment-2170 Mon, 27 Feb 2017 05:53:03 +0000 http://www.circuitbasics.com/?p=251022#comment-2170 Did you use the library in the zip file from the post, or did you download it from the Arduino.cc page? Version 0.1.21 has some issues and doesn’t appear to work. The zip file in the post is version 0.1.14, and it does work. Also, are you using the Uno, or another board? I couldn’t get the library to work on my Arduino 101…

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By: Circuit Basics http://www.circuitbasics.com/how-to-set-up-the-dht11-humidity-sensor-on-an-arduino/#comment-2169 Mon, 27 Feb 2017 05:49:09 +0000 http://www.circuitbasics.com/?p=251022#comment-2169 Yes it can, actually we have another tutorial on how to set it up on the Raspberry Pi: http://www.circuitbasics.com/how-to-set-up-the-dht11-humidity-sensor-on-the-raspberry-pi/

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