Frustrated UDOO - DHT22

My UDOO spec :
1. UDOO Dual
2. 8 gb MicroSD
3. Ubuntu 12.04
4. Compile from other PC
5. DHT22

I've test this DHT22 with Arduino Mega and It works smoothly. Showing humidity and temperature.
This is example code just copy and paste :
#include "DHT.h"
DHT dht;

void setup()
{
Serial.begin(9600);
Serial.println();
Serial.println("Status\tHumidity (%)\tTemperature (C)\t(F)");

dht.setup(2); // data pin 2
}

void loop()
{
delay(dht.getMinimumSamplingPeriod());

float humidity = dht.getHumidity();
float temperature = dht.getTemperature();

Serial.print(dht.getStatusString());
Serial.print("\t");
Serial.print(humidity, 1);
Serial.print("\t\t");
Serial.print(temperature, 1);
Serial.print("\t\t");
Serial.println(dht.toFahrenheit(temperature), 1);
}


and then I put this DHT22 on UDOO port. Same code, same DHT22. But the result is always showing "nan".
I really frustrated using UDOO.
Please help me, is there something I missed ?

 

Hi,
The good news is the DHT22 works great with UDOO. I have it working where it is providing TEMP and HUMIDITY for my bedroom and communicating that data real time to a web interface via NODE.JS. As I have seen different libraries for the DHT22, I am not sure which one you are using. I will be able to provide additional data once I am at home. But it does work.

 

ariadrianto: Remember that the Udoo is 3.3V on the pins, Arduino Mega is 5V. Make sure you're providing the proper V-in to the DHT22 and that it's set up for 3.3V data IO.

 

Dantavious, can you share with us how you setup that? It's sound great!

 

I have the same problem, I've tried different libraries but with no sucess.
Has anyone found a library that works properly?
Dantavious?

 

Hi berta17,
first of all follow the mkopack's suggestion:

If you're not experienced with wiring, here is a simple guide to solve your problem: http://udoo.org/tutorial/arduino-shields-with-udoo/
If your problem regards the communication with the server instead, I hope Dantavious is going to share his solution, 'cause it will be surely helpful for the other users.

 

Hi Andrea, the datasheet says that power supply can be 3.3-5.5V so i think the problem is in the libraries.
I'm quite a beginner but I'll share the solution if I can find it

 

Hi there berta17,
I was talking about UDOO I/O pins.
According to the datasheet that you can find on the page about UDOO Dual/Quad (http://udoo.org/udoo-dual-and-quad/) the standard power supply is 12v.
Regarding UDOO I/O pins: are 3.3V only compliant. Providing shields with higher voltage, like 5V, could damage the board. Use only shields Arduino DUE compatible (3.3V). Otherwise, just do a bit of wiring (http://udoo.org/tutorial/arduino-shields-with-udoo/).

 

ok, I supply the sensor with 3.3V so it shouldn't be the problem.
Thank you again for the support

 

Your welcome!