Timeline for How to determine if DHT22 is working?
Current License: CC BY-SA 3.0
10 events
| when toggle format | what | by | license | comment | |
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| Apr 13, 2017 at 12:56 | history | edited | CommunityBot |
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| Feb 17, 2017 at 16:22 | comment | added | Derek Wildstar | @joan I could only get a single "dent" nothing more... I've tried both 3.3V and 5V so guess something in my wiring is failing. I should retry connecting directly to GPIO instead of using the breadboard but that would rule out the other sensor I've connected and that works | |
| Feb 17, 2017 at 9:49 | comment | added | Derek Wildstar | @goobering apparenlty the sensor works well when connected with short cable so guess 3.3 is just enough on very short distance (10cm) but my cable + breadbord + cable seems to drop the current under minimum voltage... | |
| Feb 17, 2017 at 9:48 | comment | added | joan | Try abyz.co.uk/rpi/pigpio/piscope.html and look at the data travelling on the GPIO. It should look like abyz.co.uk/images/DHT22.png | |
| Feb 17, 2017 at 9:40 | comment | added | Derek Wildstar | @joan the reference was fine... I'm using a cable cobbler where there's GPIO number :) | |
| Feb 14, 2017 at 12:23 | comment | added | joan | You used DHTXXD with -g6 which is Broadcom GPIO 6 which is connected to expansion header pin 31. Are you sure the data line is connected to the GPIO you think it is? See abyz.co.uk/rpi/pigpio/index.html#Type_3 for the mapping between GPIO and pins. | |
| Feb 14, 2017 at 12:10 | comment | added | goobering | If you've a couple of resistors knocking about you could try your hand at making a voltage divider? | |
| Feb 14, 2017 at 12:09 | comment | added | Derek Wildstar | @goobering AH... cannot believe I did not realized that was saying 3.5 V :( however I do not have a logic level converter at hand so guess I need to wait (unless there's another safe way to do it, I'm a newbie) | |
| Feb 14, 2017 at 12:00 | comment | added | goobering | The listings I can find for that part show a required voltage input of 3.5V - 6V. Have you tried hooking it up to the 5V pin, rather than the 3.3V pin, and using a logic level converter (to make sure you don't exceed the Pi's 3.3V input limit) for the return signal? | |
| Feb 14, 2017 at 8:33 | history | asked | Derek Wildstar | CC BY-SA 3.0 |
