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AM2320 temperature and humidity sensor and ESP32 example

by shedboy71

Temperature and humidity combined sensor AM2320 digital temperature and humidity sensor is a digital signal output has been calibrated. Using special temperature and humidity acquisition technology, ensure that the product has a very high reliability and excellent long-term stability. Sensor consists of a capacitive moisture element and an integrated high-precision temperature measurement devices, and connected with a high-performance microprocessor .

AM2320 communication using a single bus, two communication modes standard I2C. Standard single-bus interface, the system integration becomes easy and quick. Ultra-small size, low power consumption, signal transmission distance up to 20 meters, making all kinds of applications and even the most demanding applications the best choice. I2C communication using standard communication sequence, the user can directly linked to the I2C communication bus without additional wiring, simple to use.

Two communication modes are used as humidity, temperature, and other digital information directly CRC checksum temperature-compensated output, users do not need to calculate the secondary digital output, and no need for temperature compensation of the humidity, temperature and humidity can be accurately information. Two communication modes are free to switch, the user can freely choose, easy to use, wide range of applications.

Specifications

• Operating Voltage: 3.1 VDC to 5.5 VDC
• Operating Temperature Range: -40 ° C to + 80 ° C
• Humidity Range: 0 to 99.9% RH
• Accuracy ( 25 ° C environment)
Temperature: ± 0.5 ° C
Humidity: ± 3%
• RH (10 … 90% RH)
Resolution: Temperature: 0.1 ° C
Resolution: Humidity: 0.1% RH
• Attenuation values
Temperature: <0.1 ℃ / Year
Humidity: <1% RH / Year
• Response time: Temperature: 5s
• Response Time: Humidity: 5s 1 / e (63%)
• Output signal: single bus / IIC signal
• Housing material: PC plastic

 

Parts List

Name Link
ESP32
AM2302
Connecting cables

Layout

AM2302 sensor ESP32 – Wemos Lolin32
SDA 21 (SDA)
SCL 22 (SCL)
+ 3v3
– GND

 

Code

I used this library – https://github.com/EngDial/AM2320

 

#include <AM2320.h>

AM2320 th(&Wire);

void setup() {
  Serial.begin(9600);
  Wire.begin();
}

void loop() {
  Serial.println(F("Chip = AM2320"));
  switch(th.Read()) {
    case 2:
      Serial.println(F("  CRC failed"));
      break;
    case 1:
      Serial.println(F("  Sensor offline"));
      break;
    case 0:
      Serial.print(F("  Humidity = "));
      Serial.print(th.Humidity);
      Serial.println(F("%"));
      Serial.print(F("  Temperature = "));
      Serial.print(th.cTemp);
      Serial.println(F("*C"));
      Serial.println();
      break;
  }
  delay(2000);
}

 

Output

Open the serial monitor

Chip = AM2320
Humidity = 49.10%
Temperature = 22.50*C

Chip = AM2320
Humidity = 49.20%
Temperature = 22.50*C

Chip = AM2320
Humidity = 49.10%
Temperature = 22.50*C

Links

 

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Code

AM2320 temperature and humidity sensor and ESP32 example

by shedboy71

AM2320 is a simple to use, high performance temperature and humidity sensor capable of long distance signal transmission up to 20 meters.The product also has high reliability and excellent stability.

It can be used in applications like HVAC, dehumidifiers, testing and detection equipment, consumer goods, automotive, automation, data loggers, weather stations, home appliances, humidity regulator, medical, and other related humidity detection control.

The sensor consists of capacitive humidity sensor and an integrated high – precision temperature sensor and connected to a high performance microprocessor. The output is already temperature compensated resulting to accurate temperature and humidity information.

 

 

Specifications

• Operating Voltage: 3.1 VDC to 5.5 VDC
• Operating Temperature Range: -40 ° C to + 80 ° C
• Humidity Range: 0 to 99.9% RH
• Accuracy ( 25 ° C environment)
Temperature: ± 0.5 ° C
Humidity: ± 3%
• RH (10 … 90% RH)
Resolution: Temperature: 0.1 ° C
Resolution: Humidity: 0.1% RH
• Attenuation values
Temperature: <0.1 ℃ / Year
Humidity: <1% RH / Year
• Response time: Temperature: 5s
• Response Time: Humidity: 5s 1 / e (63%)
• Output signal: single bus / IIC signal
• Housing material: PC plastic

Parts Required

Here are the parts I used

you can connect to the sensor using a standard header the classic dupont style jumper wire.

Name Link
ESP32
AM2320
Connecting cables

Layout

Once again this layout is based around my trusty ESP32 Wemos LOLIN32 board

esp32 and am2302

esp32 and am2302

 

Code

You will need to install the folllowing library from https://github.com/EngDial/AM2320

#include <Wire.h>
#include <AM2320.h>

AM2320 th;

void setup() {
Serial.begin(9600);
Wire.begin();
}

void loop() {
Serial.println("Chip = AM2320");
switch(th.Read()) {
case 2:
Serial.println(" CRC failed");
break;
case 1:
Serial.println(" Sensor offline");
break;
case 0:
Serial.print(" Humidity = ");
Serial.print(th.Humidity);
Serial.println("%");
Serial.print(" Temperature = ");
Serial.print(th.cTemp);
Serial.println("*C");
Serial.println();
break;
}
delay(2000);
}

 

Output

Open the serial monitor

Chip = AM2320
Humidity = 47.10%
Temperature = 24.80*C

Chip = AM2320
Humidity = 48.70%
Temperature = 25.10*C

Chip = AM2320
Humidity = 53.60%
Temperature = 25.40*C

Chip = AM2320
Humidity = 55.80%
Temperature = 25.80*C

Chip = AM2320
Humidity = 59.80%
Temperature = 26.20*C

 

Links

https://akizukidenshi.com/download/ds/aosong/AM2320.pdf

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