Steve
It looks like I can get the older chip from DigiKey. I'll just have to make up a large enought order to make it worth while ordering from them.
Thanks
JohnW
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Steve
It looks like I can get the older chip from DigiKey. I'll just have to make up a large enought order to make it worth while ordering from them.
Thanks
JohnW
Hi John W
I'm in exactly the same boat - I'm in Canada and can't find a source for the 18F452. I have the pdf version of the 3" thick DigiKey catalog and did a search in acrobat but couldn't find it there. Can you give me the DigiKey part number that you turned up?
Sid H
digikey part number is PIC18F452-I/P-ND. Last time I purchased them was mid Jun-09.
Sid
That is the same number I found on their online store. They show about 650 in stock. Current price is $9.29
JohnW
Microchip still supply Sample Pic 18F452-I/P 40 pin chips.
Samples are free but i'm not sure if there is a postage charge now. You have to register for samples. I understand you can order up to 3 chips of any one type and up to 4 different models.
Check out their Website below.
http://www.microchip.com/samples/Def...stCookies=true
Regards.
Bravo.
How do you connect the display trim pot? Steve PCB2 shows 4 holes ( 3 holes negative and one to pin 3 on display). Does one outer leg of the trim pot go to pin 3 and the middle and other outer to negative?
many thanks, Mike
Sorry - I'm not getting notification of responses to this thread. (again)
the reason there are 4 holes is to allow two common sizes of presets to be fitted.
Essentially what you say is correct, the preset allows pin 3 on the display to be routed to ground - the setting of the preset changing the resistance and hence the contrast.
If you don't want to fit a preset then you could simply experiment with different values of resistor between pin 3 and gnd until you find one you're happy with.
(You can even connect pin 3 direct to ground, the display will be slightly dark but probably not too dark...)
Anyone found a good source for a case that will hold both the keyboard and display? Saw one that was T shaped in a previous message that looked pretty cool. Be nice to find a premade case to hold them and the PCB.
I think I found a case will report back with what I find....
TIA
Marty
Mesa, AZ
BUD make some hand help operator units.
http://www.budind.com/
Al.