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I need a little help

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TronicBrain

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Hi all

I have a problem of choosing the PIC Which I need
and I have a project of thermometer with LCD.

The PIC I need should has the flowing properties
1-ADC with 4/8
2-18 I/O pins or less
3-supported by Nigel's programmer (the last version)

So I need a list of all PICs Which match the properties above to tell the distributor here to see which is available.
I do not want to use pic16F877a and 16F876a, they are expensive for my project .

And it’s very difficult for me to download all the data sheets from microchip website
The connection here is slow enough to take me 5 hours or maybe more.

Any one have the experience to help me

thanks
 
OK, so from your text there is another issue, price.

Exactly how many I/O pins do you need?

And what voltage must you run at?

And how fast?

Does the clock speed have to be very accurate?

The PIC12F629 would be a great choice; very cheap, 8 pin DIL/SOIC, up to 6 I/O pins. It has a built in calibrated 4MHz oscillator ( it's RC, so not *very* accurate ) so you do not even need an external crystal - making the price even cheaper.

Mike.
 
Exactly how many I/O pins do you need?

I need 2 analogue channels and 6 pins to drive the LCD and one out put digital pin
Then they are 9 pins at least

And what voltage must you run at?

5V

And how fast?

4MH

Does the clock speed have to be very accurate?

No , there is no problem of being the oscillator internal or external RC

So 12F629 is not suitable, I need three more pins.

Initially the price is not important if it’s less than the price of (16f877a , 16f876a) .

Do you have another suggestion?

thanks
 
perhaps you can get some 16F676 chips - they are 'old', so they should be inexpensive and they're supported by just about every programmer out there.

12 I/O lines total
8 analog inputs
4 mhz internal RC clock
1024 words of flash space (14 bit words)
64 bytes of ram
128 bytes of eeprom

avaiable in 14 pin DIP or SO package
 
16F676 seems to be the best for my project

I will ask the distributor here if can be availlable.

if not I will ask for more suggestions

thank you guys :)
 
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