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car radio LCD Arduino??? Answered

i got a old LCD from a car radio, can i connect it to my Arduino??
and if i can how??? plz help me im bored :(


4 Replies

maewert (author)2010-09-27

It appears to be an bank of 4 seven segment LED arrays, there appears to be decimal points as well as the two dots between the two pairs of numbers so time can be displayed as 12:55, etc.

The board appears to wire each segment out to the connector.  In order to drive it from an Arduino, you'll probably need 4 seven segment display drivers chips since the arduino won't have enough output pins to drive each of the pins directly.

These devices are usually common-annode or common-cathode, so you'll need to first discover which it is.  You should be able to take a 5 volt supply and a 470 ohm resistor in series and momentarily powering the connector pinsand see what segments turn on.  You should be able to determine the entire pinout that way.

Best Wishes.

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Dannne11 (author)2010-09-25
frollard (author)2010-09-25

That looks like a numerical 7 segment display -- does it light up individual segments when you apply a few volts to some of the pins? Do a little investigation and look for a common ground (or grounds)...

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frollard (author)frollard2010-09-25

looking at picture 4 -- those 4 beefy resistors in parallel seem to be the 'ground' -- as they all connect to a few single pins, makes me think thats 3 or 4 wires for ground, and the rest are + for signal.

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