The sensor AHT3001 cannot be recognized by Arduino Uno

Other Hardware Sensors
1

The temperature and humidity sensor's information can be found at AHT3001 Temperature and Humidity Sensor

My circuit details:

  1. The pullup resistor for SDA & SCL is 4.7kΩ(I also tried 10 kΩ).
  2. The RC for VCC is 106 and 100 Ω.

The code for scanning:

#include <Wire.h>

void setup() {
  Wire.begin();
  Wire.setClock(100000);
  Serial.begin(9600);
  Serial.println("\nI2C Scanner");
}

void loop() {
  byte error, address;
  int nDevices = 0;

  Serial.println("Scanning...");

  for (address = 1; address < 127; address++) {
    Serial.print("Scanning address: 0x");
    if (address < 16) Serial.print("0");
    Serial.println(address, HEX);
    Wire.beginTransmission(address);
    error = Wire.endTransmission();

    if (error == 0) {
      Serial.print("I2C device found at address 0x");
      if (address < 16) Serial.print("0");
      Serial.println(address, HEX);
      nDevices++;
    } else if (error == 4) {
      Serial.print("Unknown error at address 0x");
      if (address < 16) Serial.print("0");
      Serial.println(address, HEX);
    }
  }

  if (nDevices == 0) {
    Serial.println("No I2C devices found\n");
  } else {
    Serial.println("done\n");
  }

  delay(5000);
}

BTW, the sensor AHT30 works fine, so Arduino Uno has no problem.

2

I see no link to the appropriate data sheet.

3

Hi robtillaart,

Very appreciate your quick reply.
Actually, I didn't find a datasheet in English and the picture below is the pin definitions missing.

image
image843×621 70.7 KB

And its technical parameter is like below
image

My circuit diagram is like

image
image916×371 82.4 KB

I have tried different R1 values like 10Ω,100Ω, 330Ω with VCC 3.3V and 5 V and no one works.

  • VCC 5V + R1 10Ω, the scanning will be stuck
  • VCC 5V + R1 100Ω, normally, the scanning won't find the sensor. Occasionally, it will get stuck or tell me the sensor found at 0x01(I think this is wrong).
  • VCC 5V + R1 330Ω, the scanning won't find the sensor.

Besides, this is its official website: http://www.aosong.com/en/products-114.html

4

Any language is OK,

try 1K pullups, especially when VCC is 2.2 or 3.3 volt the 4K7 can be too weak.

5

Hello robtillaart,

Very appreciate it.
Oh, my VCC is 5V and let me try 3.3V with 1K pullups.
Besides, as a new user, I cannot upload the doc.

6

Any link is OK

7

Hi robtillaart,
Thank u.
I just snapshot it. It is an only 1 page file.

image
image685×833 127 KB

Besides, 3.3V with 1K also cannot be recognized.

8

Thanks, it provides no new information (google translate: Chinese => English)

On the website you linked to in post #1, is an email address.

Maybe you should contact them for a more detailed datasheet which includes registers to access for temp / humidity etc.

9

Hi robtillaart,

Thanks a lot. They said they will contact me tomorrow. Hope we can get something useful.

10

I believe it uses the AHT30 sensor.
Here is the datasheet:
good-pdf-12751003-1.pdf (1.1 MB)

The I2C address is 0x70
Vdd should be 5V

I think the device you have already has R1/C1 on it

1 Like
11

Hi jim-p,

Thanks a lot.
Actually, it is AHT3001 instead of AHT30. I have tested AHT30 with my Arduino Uno and it works fine. Besides, the circuit diagram above is from the AHT30 data sheet.

12

I don't see an AHT3001 sensor only the AHT30.
AHT3001 is the part number of customized product using the FPC cable which I believe uses the AHT30

1 Like
13

Hi jim-p,

They told me this is a new sensor designed by themselves. I don't know the details and maybe your understanding is correct. Hope tomorrow they can give me more details. Besides, I am using a converter to use it.

image
image1027×447 35.4 KB

14

That would be a big help

15

Hi jim-p,

I looked at it very carefully, and I think you are right that there is C1 & R1. But if I don't add C1 & R1 in my circuit, the scanning will get stuck.

16

You may have it wired backwards.
Pin 1 of the AHT3001 is on the top in your picture. That may be connected to pin 4 on the header
image

17

Hi jim-p,

I think you mean I should wire it like this way, right?

image
image1296×451 57.6 KB

I just tried it with 4.7Ω pull-ups, and it is still not recognized.

18

No, the FPC cable orientation in you first picture is correct.
If your board looks like the one I show, then it's the connections on the pin header that need to be reversed.
See how pin 1 of the FPC connects to pin 4 on the header.

19

image
image1534×551 65.9 KB

I just changed it back and exchanged pin 1 and pin 4 as above. Then scanning program get stuck.
image

20

It may have been damaged when you connected it wrong.

1 Like