low cost ADC
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Hi All!
I am looking for an inexpensive ADC for use with the BS2. I need to
sample at least 5 inputs simultaneously (or nearly so). The inputs
would ideally receive a pulse from a flexible piezoelectric transducer.
I was hoping to be able to do this without further signal conditioning.
The transducers already provide a 0-5 V pulse. I am a total novice
with ADC's and know that many of you use the MAX186 ADC ($30-40 on
website - can this be right??). I know I can get free samples but would
like to find one that will be cost effective for mass production
($1-10). Is this realistic? I know many PICS have onboard ADCs. Would
this be a more sensible choice? Any specific models you can recommend?
Thanks in advance!
Randy Myers
I am looking for an inexpensive ADC for use with the BS2. I need to
sample at least 5 inputs simultaneously (or nearly so). The inputs
would ideally receive a pulse from a flexible piezoelectric transducer.
I was hoping to be able to do this without further signal conditioning.
The transducers already provide a 0-5 V pulse. I am a total novice
with ADC's and know that many of you use the MAX186 ADC ($30-40 on
website - can this be right??). I know I can get free samples but would
like to find one that will be cost effective for mass production
($1-10). Is this realistic? I know many PICS have onboard ADCs. Would
this be a more sensible choice? Any specific models you can recommend?
Thanks in advance!
Randy Myers
Comments
memory,...).
If you buy the pbp compiler from melabs you get the same instruction set as
the stamp but compiled and with some extra instructions (like a real if ...
then ... else). You can buy this chip for $7 from Crownhill. Of course you
have to buy the compiler and a programmer but if you want to make a couple
of these you will have your money back fast! (and there are other solutions
from Microchip that are cheaper than the 16f877)
> Hi All!
>
> I am looking for an inexpensive ADC for use with the BS2. I need to
> sample at least 5 inputs simultaneously (or nearly so). The inputs
> would ideally receive a pulse from a flexible piezoelectric transducer.
> I was hoping to be able to do this without further signal conditioning.
> The transducers already provide a 0-5 V pulse. I am a total novice
> with ADC's and know that many of you use the MAX186 ADC ($30-40 on
> website - can this be right??). I know I can get free samples but would
> like to find one that will be cost effective for mass production
> ($1-10). Is this realistic? I know many PICS have onboard ADCs. Would
> this be a more sensible choice? Any specific models you can recommend?
> Thanks in advance!
>
> Randy Myers
>
>
>
>
>
Do you happen to know if there are any PICs that "track and hold" as do some
ADCs? I would like to sample multiple simultaneous peak readings of the
piezoelectric transducers.
the 8-pin PIC12C671 programmed as an 8-bit, "Serial" AD
converter.
This PIC is programmed to sample 4 individual analog channels
and send the value of each reading out "Serially". The format is:
N9600 baud
Channel #, AD reading. For all four -- channels.
These make adding 4-channel, 8-bit, serial AD to any
BASIC Stamp application simple & affordable. You only need
to commit a "single I/O-pin" to use them, and they sample
continously. You just read - in the serial data when you need
the sample.
If you already have PicBasic, or PicBasic Pro, you can have
the source-code for FREE to make your own 4-channel, serial
ADC ICs. If you don't own PicBasic, we sell the pre-programmed
PIC12C671s also, and they work excellent with Stamp-based
applications.
Here's where to find them:
http://www.rentron.com/four-channel-ad.htm
Regards,
Bruce Reynolds
webmaster@r...
Original Message
From: "Thierry Vanmarcke" <tvm@p...>
To: <basicstamps@egroups.com>
Sent: Friday, August 11, 2000 1:28 AM
Subject: Re: [noparse][[/noparse]basicstamps] low cost ADC
| A cheap solution would be a pic16f877 (8 ADC's, 33I/O's, 8Kb program
| memory,...).
| If you buy the pbp compiler from melabs you get the same instruction set as
| the stamp but compiled and with some extra instructions (like a real if ...
| then ... else). You can buy this chip for $7 from Crownhill. Of course you
| have to buy the compiler and a programmer but if you want to make a couple
| of these you will have your money back fast! (and there are other solutions
| from Microchip that are cheaper than the 16f877)
|
|
| > Hi All!
| >
| > I am looking for an inexpensive ADC for use with the BS2. I need to
| > sample at least 5 inputs simultaneously (or nearly so). The inputs
| > would ideally receive a pulse from a flexible piezoelectric transducer.
| > I was hoping to be able to do this without further signal conditioning.
| > The transducers already provide a 0-5 V pulse. I am a total novice
| > with ADC's and know that many of you use the MAX186 ADC ($30-40 on
| > website - can this be right??). I know I can get free samples but would
| > like to find one that will be cost effective for mass production
| > ($1-10). Is this realistic? I know many PICS have onboard ADCs. Would
| > this be a more sensible choice? Any specific models you can recommend?
| > Thanks in advance!
| >
| > Randy Myers
| >
| >
| >
| >
| >
|
|
|
|
|