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Topic: 16x2 LCD backlight relay problem (Read 4 times) previous topic - next topic

matinzk

Hi everyone.

I have put a normal 16x2 blue LCD in my car to read some values including temps, boost etc.

For the backlight, I have decided to connect the pin 15 to a relay, so when I put the parking lights on the LCD's backlight comes on. It comes on etc, however as soon as the backlight comes on I see garbage on the LCD!

With the parking lights off, therefore the relay being off and the backlight the LCD shows everything absolutely fine.

Any ideas?

Thanks.

floresta

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Any ideas?

Try connecting the backlight directly to the power source (without the relay) to determine if the problem derives from the backlight or from the relay.

Don

matinzk

Yes, when I connect the backlight directly to power source, it still happens.

I have to also add that, the positive leg of the LED is connected directly to my power source. I haven't gone via the pin 15.

matinzk


floresta

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BUMP


I'll give you my response to reply #2 in a few hours.


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