Lcd 16x2 and Usb.Init ()

[mauros]

I do not know if you are still there. The LCD + i2C display with a simple sketch works and the display shows the characters correctly, but using lcd + i2C in my sketch, i have the same problem as the LCD 1602 without i2C module, and the lcd does not shows anything and i understand that the cause is because the serial does not turn on, in fact the if (Serial.available ()) returns value False, while disconnecting the i2C module the serial works regularly.

 

[mauros]

Ian, you left me :'( :'( :'(

 

[Ian Rogers]

No! I went on holiday... We're allowed to do that you know!!

As you may already know... I don't really follow Arduino.. I do pic's.. The Arduino system has very few pins so interfacing two or more shields will always be a headache.. I thought that the I2C pins on an Arduino were on AD4 and 5 so they shouldn't affect serial atall..

 

[mauros]

oh sorry, I hope you're relaxed ;-) I also think that analog pins 4 and 5 should not affect the serial, unfortunately the problem does not resolve

 

[Ian Rogers]

As we have a different set up, you need to post the code... Are you now connecting the LCD direct to the Arduino? if so you need a different library..

 

[mauros]

Yes, I'm connecting the lcd to arduino but the code is too long to enter here, there are about 500 lines.

 

[Ian Rogers]

What pins?

 

[mauros]

5V - GND - A4 - A5

 

[mauros]

**broken link removed**

Not directly to Arduino but through the USB Host Shield

 

[mauros]

this is what I assembled
https://imgur.com/s8Iznd8

 

[be80be]

Arduino I2c and USB don't play well

 

[mauros]

maybe even without i2C because i have the same problem with only lcd 16x2 without i2C

 

[Ian Rogers]

looking at the PDF for the keyes shield.... The MAX_LCD library uses the digital pins on the shield to drive an LCD as the shield itself uses eight Arduino pins.. The MAX_LCD library is built into the host shield library..

This is how I would run the display!!

If you open this link
http://tinkbox.ph/sites/tinkbox.ph/files/downloads/Keyes - USB Host Shield.pdf
there is a library link within..

 

[mauros]

I can try it out because a USB_Host_Shield library is already included and it also contains the max_LCD files, although they know that they have different sizes.

Thanks !

 

[mauros]

Alas it does not work

 

[Ian Rogers]

After many posts I don't seem to know where we are... What isn't working? LCD? or LCD combined with serial?

 

[Ian Rogers]

I think you need to solder a header onto the shield as it uses the digital port off the max chip..

 

[mauros]

After many posts I don't seem to know where we are... What isn't working? LCD? or LCD combined with serial?

LCD itself works but not in combination Arduino

 

[mauros]

I think you need to solder a header onto the shield as it uses the digital port off the max chip..

in what sense, can you explain in detail?