Go Down

Topic: [Arduino Mega] Wire Problem / defect ? (Read 403 times) previous topic - next topic

Jomelo

Hi,

i bought a new Arduino and try to get I2C to run.

I use the "Wire" Libary on pin 20/21 but nothing happens.

The programm stops at:

Wire.endTransmission();

Have someone ideas ?

Pull-Up Resitors are 1k8 Ohm.

Sorry vor my bad english.
Jomelo

Grumpy_Mike

That pull up is a bit low for 5V, I would use 4k7.

Have you connected the I2C lines to analogue 4 & 5? It needs to be this rather than the digital 4 & 5.

Jomelo

#2
Jul 13, 2009, 11:40 am Last Edit: Jul 13, 2009, 11:42 am by Jomelo Reason: 1
Hi,
i test 1k8, 4K7 and 10k Ohm nothing happens.

On Arduino Mega the SDA and SCL Pins are on Pin 20 / 21 not at 4 / 5.
:-(

kg4wsv

I have used a DS1307 I2C RTC with the mega; it worked fine.

-j

Go Up
 


Please enter a valid email to subscribe

Confirm your email address

We need to confirm your email address.
To complete the subscription, please click the link in the email we just sent you.

Thank you for subscribing!

Arduino
via Egeo 16
Torino, 10131
Italy