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jameshung
Joined: 21 Apr 2005
Posts: 1
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| help LCD problem combine 2 LCD(2*16) into 1 LCD(4*16) |
 Posted: Thu Apr 21, 2005 12:37 am |
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I have two 2*16 LCD modules and using 16f877a
I want to combine two LCD into one 4*16
Can any one help me |
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Mark
Joined: 07 Sep 2003
Posts: 2838
Location: Atlanta, GA
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| Posted: Thu Apr 21, 2005 6:25 am |
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| You can't really combine them. You will have to treat them separately. I would just go for a 4x20 display. They are pretty cheap. We buy them in fairly small quanities for under $11 USD |
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DragonPIC
Joined: 11 Nov 2003
Posts: 118
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| Posted: Thu Apr 21, 2005 1:36 pm |
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You should be able to use both if you give each one their own enable pin and by using a couple resistors on each LCD's data signals. Or you could use 2 ports and give them their own bus instead of sharing.
Marks idea would be ideal.
_________________
-Matt |
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Mark
Joined: 07 Sep 2003
Posts: 2838
Location: Atlanta, GA
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| Posted: Thu Apr 21, 2005 1:40 pm |
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| DragonPIC wrote: | You should be able to use both if you give each one their own enable pin and by using a couple resistors on each LCD's data signals. Or you could use 2 ports and give them their own bus instead of sharing.
Marks idea would be ideal. |
In addition, he would have to change his code to handle with display to write to based upon what line. Since he is kind of asking how to do this, he probably doesn't know how and someone would have to help. Since no one will have the hardware, no one is likely to help. If this is a onesy hobby project and he lives in the US, if he will send me an address I'll just send him a 4x20. |
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DragonPIC
Joined: 11 Nov 2003
Posts: 118
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| Posted: Thu Apr 21, 2005 2:07 pm |
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Mark is giving away 4x20 LCD displays.....?
I'll take one 
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-Matt |
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newguy
Joined: 24 Jun 2004
Posts: 1907
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| Posted: Thu Apr 21, 2005 2:32 pm |
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Mark,
Where do you get your lcds from? $11 is pretty cheap, but I'm willing to bet that's for the non-backlit version. Even so, that's cheap. |
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Mark
Joined: 07 Sep 2003
Posts: 2838
Location: Atlanta, GA
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| Posted: Thu Apr 21, 2005 2:57 pm |
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Well it looks like the price went up or the supplier lied (they do that) when they gave us the pitch:
Hantronix - HDM20416L -1-Y10S -$16 - white LED backlight
HANTRONIX - HDM20416L-1-L30S - $12 - yellow LED backlight |
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newguy
Joined: 24 Jun 2004
Posts: 1907
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| Posted: Thu Apr 21, 2005 5:49 pm |
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Mark,
Thanks for the info. Compared to what I pay, those prices are still very cheap. |
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