Multi module MCP4725 with I2C

Projects Programming
1

I have a project with DHT22. i use 2 DAC MCP4725 to export 0-5V temprature and humidity. Now i only do one of them. how to export 2 data by I2C protocol???. I make a code by mysefl but it doesn't work. Can you help me fix it???. Thank you

#include <Wire.h>
#include <Adafruit_MCP4725.h>
Adafruit_MCP4725 dac; // constructor
#include <DHT.h>;

//Constants
#define DHTPIN 7     // what pin we're connected to
#define DHTTYPE DHT22   // DHT 22  (AM2302)
DHT dht(DHTPIN, DHTTYPE); //// 

float hum;  //Stores humidity value
float temp; //Stores temperature value
float ctemp;
void setup(void) {
Serial.begin(9600);
dac.begin(0x60); 
dac.begin(0x62);
dht.begin();
}
void loop()
{
 delay(2000);
 //Read data and store it to variables hum and temp
 hum = dht.readHumidity();
 temp= dht.readTemperature();
 ctemp= temp+40;
 uint32_t dac_value;
 Wire.beginTransmission(0x60);
 Wire.write(0);
 Wire.endTransmission(0x60);  
 dac_value = hum*4095.9/100;
 dac.setVoltage(dac_value, false); 
 Wire.beginTransmission(0x62);
 Wire.write(0);
 Wire.endTransmission(0x62); 
 dac_value = ctemp*4095.9/120;
 dac.setVoltage(dac_value, false); 
 }

DAC.ino (951 Bytes)

2

dac.begin(0x60);
dac.begin(0x62);

So what is it, 60 or 62.

Better give them different names (throughout the sketch), like:

dac1.begin(0x60);
dac2.begin(0x62);
...
dac1_value = ...
dac2_value = ...

etc.
Leo..

3

Wawa:
dac.begin(0x60);
dac.begin(0x62);

So what is it, 60 or 62.

Better give them different names (throughout the sketch), like:

dac1.begin(0x60);
dac2.begin(0x62);
...
dac1_value = ...
dac2_value = ...

etc.
Leo..

Thank, but if i fix like you, code will error

4

Should we guess what you have done wrong?

Read the "How to use this forum" sticky, found at the top of every main page.
Leo..