I connected a HT sensor AM2301 to a Nano 33 IoT but the values returned are always wrong. I correctly connect the 3V3 pin, the GND pin and the DATA pin but the values returned from the sensor are wrong (temp: -3275.1, humy: 49.9). Blowing on the sensor these values change (remaining wrong) so I think the sensor is anyway good. I use another, identical sensor but the result remains the same. The software part is correct but I'm not sure about the wires connection. Some online examples report the use of a 10K resitor between VCC and DATA pins. What am I doing wrong? The sensor red wire (VCC) in connected with Arduino 3V3 pin The sensor black wire (GND) in connected with Arduino GND pin The sensor yellow wire (DATA) in connected with Arduino D6 pin (digital GPIO [1727804525716] [1727805073679]

Always show us a good schematic of your proposed circuit. Show us good images of your ‘actual’ wiring. Give links to components.

I'll echo what Larry says [image] How to make a schematic you can post. Introductory Tutorials When you submit a question on the forum you will usually need to add a schematic (circuit diagram). The tutorial that follows will explain some ways to create a useful image; however lets start by explaining how to add the image to your post. Its easy. Having created the image all you need to do is : Save the image somewhere convenient - maybe your desktop Start your post, and place the cursor (insertion point) where you want the image to be shown; [upload image to forum] 3: click th… and dont assume we keep data sheets in our heads, so please post links [image] DHT21 AM2301 Temperature & Humidity Sensor The DHT21 digital temperature sensor is one of the commonest from the range of DHT temperature sensors and boasts a relatively high temperature measurement accuracy of 0.5oC in 0.1oC steps with a relative humidity accuracy of +/- 3%. It has only 3... Price: GBP 4.49

Humidity is in the normal range, but the temp looks very wrong, maybe a bad sensor. Of course without a wiring diagram and code it's difficult to know.

Despite you being sure that "the software part is correct", until you show us the sketch, there's no way we can know that.

@michelallara , Your other topic on the same subject deleted. Please do not duplicate your questions as doing so wastes the time and effort of the volunteers trying to help you as they are then answering the same thing in different places. Please create one topic only for your question and choose the forum category carefully. If you have multiple questions about the same project then please ask your questions in the one topic as the answers to one question provide useful context for the others, and also you won’t have to keep explaining your project repeatedly. Repeated duplicate posting could result in a temporary or permanent ban from the forum. Could you take a few moments to Learn How To Use The Forum [image] How to get the best out of this forum IDE 1.x See also FAQ - Arduino Forum for general rules on forum behavior and etiquette. Hello, Welcome to the Arduino Forum. This guide explains how to get the best out of this forum. Please read and follow the instructions below. Being new here you might think this is having rules for the sake of rules, but that is not the case. If you don’t follow the guidelines all that happens is there is a long exchange of posts while we try to get you to tell us what we need in order to help you, which is frus… It will help you get the best out of the forum in the future. Thank you.

I didn't want to duplicate the post. I would have liked to write a new, updated one and delete the old one but I can't delete my posts (and I really don't understand why). I wrote my first post and everyone told me I needed to put more information. Well, I put them on but no one seems to have noticed.

The sketch is correct, believe me (it's not the first I wrote). :wink:

I've written hundreds if not thousands of programs over the years. And I still make mistakes. If you think you don't, you're just kidding yourself. Good luck and good bye.

You didn't need a new topic, you just needed to add the required information in this one. The forum is a free service provided by Arduino and supported by volunteers working for free. The forum rule is that topics and posts cannot usually be deleted, with the exception of spam and abuse. The reason is that once a volunteer has offered help then deleting your topic wastes the time of the volunteers trying to help. Also, the forum provides a resource for others seeking answers to similar questions already asked and answered.

It was only to say that my question is about the wire connection and the usage of a 10K resistor. Anyway thank you.

DHT sensor connection

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johnerrington October 1, 2024, 5:05pm 3

I'll echo what Larry says

and dont assume we keep data sheets in our heads, so please post links

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DHT sensor connection

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