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The AM2301 is a wired version of the DHT21, in a large plastic body.
AM2301
Specifications:
- Type: AM2301
- Accuracy resolution: 0.1
- Measurement range: 0-100%RH
- Temperature measurement range: -40℃ ~ +80℃
- Humidity measurement precision: ±3%RH
- Temperature measurement precision: ±0.5℃
This Sensor has 3 wires, connect these wires to your Arduino like this
| Sensor | Arduino |
|---|---|
| Red | +5V |
| Black | GND |
| Yellow | Digital I/O |
Code
Since this is basically a packaged up DHT21, you use DHT libraries and here is a code example that will display the temperature and humidity readings on an LCD display.
[codesyntax lang=”cpp”]
#include "DHT.h"
#include <LiquidCrystal.h>
#define DHTPIN 11 // modify to the pin we connected
#define DHTTYPE DHT21 // AM2301
DHT dht(DHTPIN, DHTTYPE);
//setup for the LCD keypad shield
LiquidCrystal lcd(8, 9, 4, 5, 6, 7);
void setup()
{
Serial.begin(9600);
lcd.begin(16,2);
Serial.println("DHTxx test!");
dht.begin();
//line 1 - Temperature
lcd.setCursor(0,0);
lcd.print("Temp: ");
//line 2 - Humidity
lcd.setCursor(0,1);
lcd.print("Hum: ");
}
void loop()
{
float h = dht.readHumidity();
float t = dht.readTemperature();
// check if returns are valid, if they are NaN (not a number) then something went wrong!
if (isnan(t) || isnan(h))
{
Serial.println("Failed to read from DHT");
}
else
{
lcd.setCursor(7,0);
lcd.print(h);
lcd.setCursor(7,1);
lcd.print(t);
delay(2000);
}
}
[/codesyntax]
Links
AM2301 DHT21 Capacitance Digital Temperature&Humidity Sensor