New Arduino user ; probably making a mistake :(:(
Account cancelled 2016-06-21 08:40:57 2899 Views3 Replies I just purchased a kaypad / LCD Shield Module Display V3 for Arduino UNO R3
Realise I am a new user to Arduino so am being very careful
Before I plug this shield I can edit and download and execute sketches.
After I plog in this unit to my Uno R3 the lcd display shows one row of 16 characters in outline see picture
I tried adjusting contrast using the trim pot but made no differnce.
After the shield is attached I cannot download sketches by that I mean it starts to download and just stops.
When I remove the shield then I can download and execute sketches.
Reconnect the shield and as before I cannot download /execute sketches
It seems like this shield is somehow incompatible with my brand new Uno R3,
Plese advise,
regards,
Trevor
Realise I am a new user to Arduino so am being very careful
Before I plug this shield I can edit and download and execute sketches.
After I plog in this unit to my Uno R3 the lcd display shows one row of 16 characters in outline see picture
I tried adjusting contrast using the trim pot but made no differnce.
After the shield is attached I cannot download sketches by that I mean it starts to download and just stops.
When I remove the shield then I can download and execute sketches.
Reconnect the shield and as before I cannot download /execute sketches
It seems like this shield is somehow incompatible with my brand new Uno R3,
Plese advise,
regards,
Trevor
2016-08-17 08:27:28 Sorry, nothing connected in the picture... No, I have the same problem where if I connect the keyboard/LCD shield, the IDE recognizes the device, BUT.... it refuses to accept download of new code. (as if the digital lines from the 16U2 are being shorted low, too weak a signal.).. the back light is powered through a SMT transistor, which is applying full +5V to the LED, held active by the resistor to the transistor base.. But, this is also acting like a dead short across the +5V line... the LED on the display has no limiting resistor. gelfling6
gelfling6 2016-08-17 01:40:30 Hi gelfling6，
Sorry， I am not very clear about your question. The back light is dark or the pin is defective? And could you provide me a more clear picture? Wendy.Hu
Sorry， I am not very clear about your question. The back light is dark or the pin is defective? And could you provide me a more clear picture?
Wendy.Hu 2016-06-21 19:58:27 Hi
I found the library on the wiki which is not a correct link, so i give a new link to download the library. Maybe you can redownload the library.
If your previous library is compatible, please check your code to make sure it is correct. If you use the examples in the library, you need to change the numbers of the interface pins into "LiquidCrystal lcd(8, 9, 4, 5, 6, 7);", because pins 4, 5, 6, 7, 8, 9 and 10 are used to interface with the LCD.
And did you connect other devices to the RX and TX pins? if you dont, i think you can download the sketches. and whats the version of your IDE? Wendy.Hu
I found the library on the wiki which is not a correct link, so i give a new link to download the library. Maybe you can redownload the library.
If your previous library is compatible, please check your code to make sure it is correct. If you use the examples in the library, you need to change the numbers of the interface pins into "LiquidCrystal lcd(8, 9, 4, 5, 6, 7);", because pins 4, 5, 6, 7, 8, 9 and 10 are used to interface with the LCD.
And did you connect other devices to the RX and TX pins? if you dont, i think you can download the sketches. and whats the version of your IDE?
Wendy.Hu 