Replies to This Discussion

Permalink Reply by Bot Thoughts on January 30, 2012 at 4:38pm

Which arduino? or which board? On the 168/328P the I2C peripheral is fixed on pin 27/28 (SDA, SCL). http://arduino.cc/it/Hacking/PinMapping168

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Permalink Reply by Dany Rassam on January 30, 2012 at 5:31pm

I am using the arduino AtMega2560. Here's the actual boards I am using:

http://code.google.com/p/arducopter/wiki/AC2Assembly

 

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Permalink Reply by Dany Rassam on January 30, 2012 at 6:20pm

This is the code I am using but need to find the pin ?????

 

const int anPin = ?????;

long anVolt, cm;

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

void loop()
{
  pinMode(anPin, INPUT);
  anVolt = analogRead(anPin);
  cm = anVolt * 2.54;
  Serial.print(cm);
  Serial.print("cm");
  Serial.println();
  delay(500);

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Permalink Reply by Bot Thoughts on January 30, 2012 at 8:43pm

The title says I2C sensor... if your sensor speaks I2C protocol and if you've plugged it into an I2C port (SDA, SCL) then you'd need to use the Wire library to talk to it. 

What sensor brand/model is it?

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Permalink Reply by Martin Szymanski on January 30, 2012 at 9:08pm

I2C sensor pin

http://lmgtfy.com/?q=I2C+sensor+pin

 

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Permalink Reply by Dany Rassam on January 31, 2012 at 3:33pm

It is a MaxBotix XL Maxsonar EZ MB1200. Here is the link:

http://www.maxbotix.com/products/MB1200.htm

Please bear with me this is my first time using this type of hardware.

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Permalink Reply by Bot Thoughts on January 31, 2012 at 5:23pm

Ok, a MaxBotics EZ0. I have played with the EZ1; same interface. It doesn't support I2C at all. It supports asynch TTL Serial, as well as Analog and pulse width timing.

Let's go back to the analog interface you were pursuing. You need to read an analog value from some pin. You don't know what pin name to use in your code.

On this page, you might notice that the left side of the IMU shield (below) has silkscreen labels on a row of otherwise unconnected pin header holes. I wonder what those labels say... (hint)

Analog (ADC) pins may sometimes be labeled ADCx or ANx where x is, say 0 thru 15. (hint)

Suppose you were to connect the MaxBotics analog pin (see datasheet pdf) to one of the exposed analog pins on the  board... In Arduino analog pins are also given names as you know. And you'd reference them as indicated when using analogRead()

Hope the hints help point you in the right direction.

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Permalink Reply by Dany Rassam on January 31, 2012 at 6:14pm

I have tried using your 'hints' and i have written some code to go along with it:

int ADC0;

long anVolt, cm;

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

void loop()
{
  pinMode(ADC0, INPUT);
  anVolt = analogRead(A0);
  cm = anVolt/1024;
  Serial.print(cm);
  Serial.print("cm");
  Serial.println();
  delay(500);
}

 

Unfortunatley it still does not seem to work. I have cycled through all the analog pins 0-15 and I keep getting 0.

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Permalink Reply by Eraser on January 31, 2012 at 6:32pm

Try measuring output of sensor with a voltmeter between signal and ground...  Then measure hooked up to Arduino, measurement should be with range of sensor output...

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Permalink Reply by Bot Thoughts on January 31, 2012 at 6:45pm

I notice you're using ADC0 to set pinMode() but you're reading from A0.

Which analog pin is the EZ0 is plugged into on the blue board? What does the silkscreen label next to the pin say?

How is the sensor getting power?

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Permalink Reply by Dany Rassam on January 31, 2012 at 6:56pm

I was still using the Pitot tube pins (They are on the right of the board in the picture you have provided). There is GND, +5V and IN. I also posted below

 

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Permalink Reply by Dany Rassam on January 31, 2012 at 6:48pm

OK my bad I was using the wrong pins thats why my code wasn't working. I am going to go and solder on some header pins to the pins you have mentioned however where is the V+ 5V? All I can see is GND and the analog signal pins.

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