Humidity/Temp Sensor Issues

[FUZNUTS]

This is my second humidity sensor.

I keep getting the same error.
Failed reading temperature from DHT
Failed reading humidity from DHT

1. I have tried 4 different DHT22 and even the one off my working Humidity sensor
2. I have tried 5 different mini pros with only my original working..
3. My original has a blue LED but the others were ordered in a ten pack and have red LED.
4. Some of the red LED mini pro will only connect @ 57600 while others and blue LED connect @ 115200
5. Changing the input pin for the DHT22 makes no difference.

Do I just have a bunch of bad Mini Pros or am I missing something?

[Dean]

Mine was doing the same thing when I had it plugged into my laptop while viewing the serial monitor. Once I connected it to my Gateway and into Vera, all is working. I got really frustrated at this, but it just seemed like it wanted to be connected to something first.
Sorry, probably not much help, but thought I would share my experience.

[Jan Gatzke]

Perhaps your minis are 3.3v 8 Mhz and you selected 5v 16 Mhz in the IDE?

[FUZNUTS]

these are all 5.5v 16mhz or at least that's what they say..lol
ill try leaving it set up on the gateway and see what happens with fingers crossed

[Salmoides]

When you apply voltage to the RAW pin, do you get 5v out of Vcc?

[FUZNUTS]

@Salmoides 5v regulated into raw comes out 4.52v on vcc

[BulldogLowell]

@FUZNUTS

have you tried to put a cap on the DHT's Vcc and ground??

[FUZNUTS]

@BulldogLowell Yes. I put one 4.7uf for the radio and one for the DHT22 with no change. Over two days I did get it to read the DHT22 once out of 1000 or so reads and that was with out any capacitors.. Reading every 5 seconds

[ludoarchi]

I have a similar problem with a pack of 10 pro mini 3,3v bought at the ebay link from mysensor ?
But every think is ok with pro mini 5.5v ...
I tried many things but it still do not work ?
Other people with same problem ?
Ideas ?
Thinks

[hek]

@ludoarchi said:

I have a similar problem with a pack of 10 pro mini 3,3v bought at the ebay link from mysensor ?

Only problem with humidiy sensor or a more general problem?

Googling 3.3v dht22 giver a lot of results. E.g.
http://forum.arduino.cc/index.php?topic=269216.0

[ludoarchi]

Problem with dht22 and ds18b20.
It looks likes a programmation beceause i just switch from arduino pro 3.3 to a 5.5 on my mys1.1 board and it works fine.
Or it s really a problem of manufacturing ...

[TimO]

I've a sensor running with naked 328p, 3.3V, 8 MHz internal Osz and DHT22. Maybe I'm lucky?!