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Forum Index : Microcontroller and PC projects : LCD blanking at random

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rogersan
Regular Member

Joined: 10/04/2015
Location: Australia
Posts: 79

Posted: 03:52pm 10 Sep 2015

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I have a 5 volt 4 line x 20 char (I could not find a 3.3 volt LCD in this size) connected to a micromite.

I use LCD INIT 3,4,5,6,7,9 to initialise and LCD 1,1,str$("text") to write data to the display.

It all works OK but sometimes the display goes blank. You can force it to happen by unplugging and replugging the USB connector to my PC on my USB to serial interface.

The program loop is still going so I cannot use a watchdog to reset the program.

One solution is to put LCD CLOSE and LCD INIT 3,4,5,6 7,9 in the program loop. This should not be necessary.

Has anyone encountered this problem?

JohnS
Guru

Joined: 18/11/2011
Location: United Kingdom
Posts: 4071

Posted: 08:36pm 10 Sep 2015

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Does it happen every time you unplug USB?

If it does... maybe something like 5V from USB is leaking somewhere that actually more volts are needed?

John

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