Digital to Analog Converter with Stamp
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Posts: 46,084
Does anyone know if a Basic Stamp can be used for D to A converter. I
think that it can but have no idea how. If anyone has done this before and
has some information I would like to review this to get me thinking on the
right track. Also what type of stamp needs to be used.
Thanks
John
think that it can but have no idea how. If anyone has done this before and
has some information I would like to review this to get me thinking on the
right track. Also what type of stamp needs to be used.
Thanks
John
Comments
if you are pulling any load, you'll need a transistor or op amp buffer.
Also, you can't do anything while charging the capacitor.
You can also use a PAK-V for this. Then you get 8 channels of PWM that all
run all the time and the Stamp can do other things.
http://www.al-williams.com/awce/pak5.htm
Regards,
Al Williams
AWC
* Stamp project of the month at http://www.al-williams.com/awce
>
Original Message
> From: JOHN8003@a... [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=_-A2VpAbX6iB4AHzn3tI8hT5fkzIFj8-9ppAMzXuUhyU33vGQk12AG6pjO580FDnaWcOMLNZbeY]JOHN8003@a...[/url
> Sent: Friday, March 17, 2000 7:23 PM
> To: basicstamps@egroups.com
> Subject: [noparse][[/noparse]basicstamps] Digital to Analog Converter with Stamp
>
>
> Does anyone know if a Basic Stamp can be used for D to A converter. I
> think that it can but have no idea how. If anyone has done this
> before and
> has some information I would like to review this to get me
> thinking on the
> right track. Also what type of stamp needs to be used.
>
> Thanks
> John
>
>
> eGroups.com Home: http://www.egroups.com/group/basicstamps/
> http://www.egroups.com - Simplifying group communications
>
There is probably an easier way than this but it will work .. ( I think )
assuming you have say a byte of data. Send the data out to a serial in parrallel
out
shift reg and then take each of the 8 outputs via a weighting resistor to the
summing junction of
an op amp. the output will be the analog of the original byte.
A nother way is to use an A/D convertor ( see STAMP app for this ) and
make closed loop with successive approx.
rom: JOHN8003@a...
Date sent: Fri, 17 Mar 2000 20:23:19 EST
To: basicstamps@egroups.com
Send reply to: basicstamps@egroups.com
Subject: [noparse][[/noparse]basicstamps] Digital to Analog Converter with Stamp
> Does anyone know if a Basic Stamp can be used for D to A converter. I
> think that it can but have no idea how. If anyone has done this before and
> has some information I would like to review this to get me thinking on the
> right track. Also what type of stamp needs to be used.
>
> Thanks
> John
>
>
> eGroups.com Home: http://www.egroups.com/group/basicstamps/
> http://www.egroups.com - Simplifying group communications
>
>
ron... the motor man...
Ronald Doctors
http://www.members.home.net/rdoctors
>D/A should be easy since you just can use a summing amp with integration.
>There is probably an easier way than this but it will work .. ( I think )
>assuming you have say a byte of data. Send the data out to a serial in
parrallel out
>shift reg and then take each of the 8 outputs via a weighting resistor to
the summing junction of
At this point you could also use an R2R resistor ladder...
2R
D0 >--/\/\--o
|
< R
>
2R |
D1 >--/\/\--o
|
< R
>
2R |
D2 >--/\/\--o
|
< R
>
2R |
D3 >--/\/\--o
|
< R
>
2R |
D4 >--/\/\--o
|
< R
>
2R |
D5 >--/\/\--o
|
< R
>
2R |
D6 >--/\/\--o
|
< R
>
2R |
D7 >--/\/\--o----> Analog Output (0-5V)
Note: if R = 1K, then 2R = 2K
...If you could "Spare" the pins, you could use this idea right off of
the Stamp, without the use of a shift register.
>an op amp. the output will be the analog of the original byte.
>A nother way is to use an A/D convertor ( see STAMP app for this ) and
>make closed loop with successive approx.
>
>rom: JOHN8003@a...
>Date sent: Fri, 17 Mar 2000 20:23:19 EST
>To: basicstamps@egroups.com
>Send reply to: basicstamps@egroups.com
>Subject: [noparse][[/noparse]basicstamps] Digital to Analog Converter with Stamp
>
>> Does anyone know if a Basic Stamp can be used for D to A converter. I
>> think that it can but have no idea how. If anyone has done this before and
>> has some information I would like to review this to get me thinking on the
>> right track. Also what type of stamp needs to be used.
>>
>> Thanks
>> John
>>
You forgot one 2R resistor to ground for the D/A. (See below)
GND
o
|
< 2R <--- Add this one
>
2R |
D0 >--/\/\--o
|
< R
>
2R |
D1 >--/\/\--o
|
< R
>
|
etc, etc.
Jared
Electrolinx - http://www.geocities.com/electrolinx/
VB Overdrive - http://extreme-vb.net/vboverdrive/