I am having a strange interaction problem between AdaFruit RGB LCD shield and Arduino UNO R3.
I am using IDE 1.6.5 and the “HelloWorld” example supplied with the display shield library. I also downloaded the latest library just to be sure.
If the display shield is not connected, the UNO connects normally on USB. Windows Device Manager shows:
Arduino Uno (COM10)
I can download sketches. The Serial Monitor displays the expected outputs. All appears normal.
But, if I unplug the USB cable, attach the shield, and reconnect the USB cable, it doesn't work.
The Windows Device Manger usually doesn't show the COM port.
* Usually it doesn't show anything.
* Sometimes it displays "Arduino UNO DFU"
* Occasionally it has shown "Unknown device"
* The Arduino software doesn't show the COM port.
I am having the same problem with 2 different UNOs.
My goal is to use the USB to write to the display. Obviously this is a no-go.
Possible clues:
* After trying assorted things, I found that removing `lcd.begin()` from the code, the COM port works normally. Of course this disables the display.
* The UNO was previously used as ISP. However Tools pull-down shows:
Programmer: “AVRISP mkII”
* I tried same sketch with a LEONARD. No problems. Leonard, does USB in firmware, and normally disconnects and re-connects the COM port when uploading
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My problem seems to be the same as the following posting. No solution to tony_a was posted.
Re: RGB LCD Shield and IDE 1.05
by tony_a on Mon Nov 04, 2013 4:34 am
I'm having my own difficulties with 1.0.5 and the RGB lcd shield on an Uno R3. The Hello World sketch makes the Arduino's COM device disappear in the Windows 7 Device Manager, to be replaced by an "Unknown Device"
RGB LCD Shield and IDE 1.6.5
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- adafruit_support_mike
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Re: RGB LCD Shield and IDE 1.6.5
Post a photo showing your hardware please. It's possible that there's a bad connection somewhere that's interfering with the USB communication. 800x600 images usually work best.
- ZAP73
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- Joined: Thu Nov 19, 2015 2:12 pm
Re: RGB LCD Shield and IDE 1.6.5
I don't know how a photo will help. There is no custom hardware. Just the Arduino, the LCD shield and USB cable.
I have the same problem with 2 different UNO boards, but not with a Leonardo.
All of the Arduino boards "seem" to work properly without the shield. The only thing I can think of is that the UNO's have had a lot of use. Maybe something got slightly "toasted", not so much as to cause a complete failure.
Just the same, I will charge the camera batteries.
I have the same problem with 2 different UNO boards, but not with a Leonardo.
All of the Arduino boards "seem" to work properly without the shield. The only thing I can think of is that the UNO's have had a lot of use. Maybe something got slightly "toasted", not so much as to cause a complete failure.
Just the same, I will charge the camera batteries.
- adafruit_support_mike
- Posts: 67454
- Joined: Thu Feb 11, 2010 2:51 pm
Re: RGB LCD Shield and IDE 1.6.5
With connection issues, you pretty much have to look at the hardware. It could be a solder joint that needs work, or an unexpected short between a component lead and something else.
Please be positive and constructive with your questions and comments.