AM2320 will this work as a replacement for AM2302 / DHT22

[brchevo]

I was looking for another humidity sensor and the AM2320 came up as a alternative to DHT22 / AM2302.
Has anyone tried this unit already? Will this work as a direct replacement in the humidity sketch for a DHT22?

Thanks in advance! :-)

[TheoL]

@brchevo I just googled for AM2320 and came accross the AdaFruit site. They say that the AM2302 is just a wired version of the DHT22. So it should work perfect since it is a DHT22.

[Omemanti]

I know, im responding to an old thread,

AM2320 is not the same as AM2302, I might be wrong, the switcheroo between 20 an 02 is easily made,

If Im correct;
AM2320 = 1 = vcc / 2 = SDA / 3 = GND / 4 = SCL

AM2302 = 1 = vcc / 2 = SDA / 3 = NC / 4 = GND

Please correct me if im wrong, cuz I dont get the AM2320 properly working.

[bgunnarb]

@Omemanti
I think the AM2320 has got an "One-wire mode", at least if you look at the datasheet. I have not tried it though.

I also had great difficulties in getting the AM2320 to work with I2C until I realised late last night that I had forgotten to include the pull-up resistors, 4k7 each from SDC and SDA to Vcc. All other I2C sensors I have used have had them included on the breakout board but this sensor does not have them built in the sensor body.
Now it works like a charm, one measurement of temp and hum every 2 minutes.
There are a few arduino-libraries for AM2320 floating around. I use this: (https://github.com/thakshak/AM2320)

Here is my sketch:

/**
 * The MySensors Arduino library handles the wireless radio link and protocol
 * between your home built sensors/actuators and HA controller of choice.
 * The sensors forms a self healing radio network with optional repeaters. Each
 * repeater and gateway builds a routing tables in EEPROM which keeps track of the
 * network topology allowing messages to be routed to nodes.
 *
 * Created by Henrik Ekblad <henrik.ekblad@mysensors.org>
 * Copyright (C) 2013-2015 Sensnology AB
 * Full contributor list: https://github.com/mysensors/Arduino/graphs/contributors
 *
 * Documentation: http://www.mysensors.org
 * Support Forum: http://forum.mysensors.org
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * version 2 as published by the Free Software Foundation.
 *
 *******************************
 *
 * DESCRIPTION
 *
 * Temperature and humidity measurement using the AM2320 with I2C interface
 * Battery voltage also monitored using internal reference
 * 
 */


// Enable debug prints to serial monitor
#define MY_DEBUG
#define MY_NODE_ID 23
#define BATTERY_SENSE_PIN A0  // Input pin for battery sense
#define VMIN 1.0  // (Min input voltage to regulator according to datasheet or guessing. (?) )
#define VMAX 3.22 // (Known or desired voltage of full batteries. If not, set to Vlim.)
#define CHILD_ID_HUM 0
#define CHILD_ID_TEMP 1
 

// Enable and select radio type attached
#define MY_RADIO_NRF24
//#define MY_RADIO_RFM69

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

#define DEBUG_PRINT 0  // Print temperature and humidity measurements on serial i/f. 1 = Yes 0 = No

unsigned long SLEEP_TIME = 120000; // Sleep time between reads (in milliseconds)
bool receivedConfig = false;
bool metric = true;
float temp, hum;


// Create an AM2320 instance
AM2320 th;
// Initialize AM temperature message
MyMessage msgt(CHILD_ID_TEMP,V_TEMP);
// Initialize AM humidity message
MyMessage msgh(CHILD_ID_HUM,V_HUM);


void before()
{
  // use the 1.1 V internal reference
  #if defined(__AVR_ATmega2560__)
    analogReference(INTERNAL1V1);
  #else
    analogReference(INTERNAL);
  #endif
  
}

void setup()  
{ 
Serial.begin(115200);
Wire.begin();
}

void presentation() {
  // Send the sketch version information to the gateway and Controller
  sendSketchInfo("Temp. Hum Sensor", "1.4");
  
  // Present temp/humidity sensor to controller
  present(CHILD_ID_TEMP, S_TEMP);
  present(CHILD_ID_HUM, S_HUM);
}

void loop()     
{
  //Get temperature and humidity from AM2320
  switch(th.Read()) {
    case 2:
      Serial.println("CRC failed");
      break;
    case 1:
      Serial.println("Sensor offline");
      break;
    case 0:
      temp = th.t;
      send(msgt.set(temp, 1));
      hum = th.h;
      send(msgh.set(hum, 0));
      if (DEBUG_PRINT == 1) {
        Serial.print("humidity: "); 
        Serial.print(th.h);
        Serial.print("%, temperature: ");
        Serial.print(th.t);
        Serial.println("*C");
      }
      break;
  }
    
  sleep (200);
  // get the battery voltage
  int batValue = analogRead(BATTERY_SENSE_PIN);    // Battery monitoring reading
  float Vbat  = batValue * 0.003363;
  int batteryPcnt = static_cast<int>(((Vbat-VMIN)/(VMAX-VMIN))*100.);   
  sendBatteryLevel(batteryPcnt);
  
  sleep(SLEEP_TIME);
}```