Backlight on LED042

W

w0es

New Member
I recently purchased a led042 GLCD, everything seems to to work ok but there is no backlight on the glcd. I have measured the voltages going to the back light pins and found the following: on K =+2.73vdc, A=+4.98vdc, -v= -4.88vdc. Also, to see the anything on the display, the contrast pot has to be fully in the ccw direction. The display characters are a gold color. I have checked connections etc and everything appears correct. Is there a software function I am not aware of? Or do I have a bad display. The V=+2,73v seems wrong to me but it is more negative than A. Thanks to any responders!

Thanking you,
Earl
 
D

Dippy

Moderator
To switch the GLCD backlight on you must send a serial command.

Something like:

Serout YourPin , T2400 , (20, 1) to switch it ON. (or ...(20,0) to switch off).
 
W

w0es

New Member
backlight

Thank you very much Gentlemen! I thought it was my lack of experience that was the problem. It is working fine now and thanks again.

Earl
 
B

BeanieBots

Moderator
One tip when using the LED042 that's not mentioned in the manuals.
It uses the "true" rather than inverted serial commands, namely T2400.
Unless you set the serial line high at the start of your program, it can miss the first command.
 
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