regarding A/D converters

Archiver

hi ,


i am planning to use taptiles in my project. the specifications
given are


Product TapTile sensor
Version 2.1 (1998)
Sensing parameter : contact pressure, weight
Sensing method : force-sensitive resistor
Active area :approx. 30 cm (12") diameter circle
Range : 45 to 1000 N (4.5 to 100 Kg, 10 to 227 lbs)
Output resistance: more than 100 KOhm (at 0 N) to 200 Ohm
(at 1000N) in parallel with 47 KOhm

Calibration [noparse]:([/noparse]force applied to center of tile)
Voltage (use 5 V power supply)
N Kg lb voltage
0 0 0 0.00
400 40.0 90.8 1.02
600 60.0 136 4.02
800 80.0 182 4.92
1000 100 227 4.96
Power supply 5 V DC, 1 mA
incl. cable
Cable 5.0 m (16 ft), shielded, red wire = power, uninsulated wire =
ground, black wire = sensor output
Connector male plug with 3 pins in a row spaced 2.54 mm (0.100")

these taptiles produce variable voltages when one steps on
it. do i need to get A/D converter to convert these voltages to
digital values or can i use RCtime command with RC circuit. if i
need to use the converters can anyone suggest what to buy. i mean we
will be having different types of converters which one would be
better for my project.


silpa

Archiver

Could you describe a little about what this is, or give a URL reference?
I'm not at all clear. I've done some stuff with the QT
charge-transfer capacitance switches, but this is sort of intriguing. I'm
interested in alternative I/O methodologies.


On Tue, 9 Mar 2004, silpa_k3 wrote:

> hi ,
>
>
> i am planning to use taptiles in my project. the specifications
> given are
>
>
> Product TapTile sensor
> Version 2.1 (1998)
> Sensing parameter : contact pressure, weight
> Sensing method : force-sensitive resistor
> Active area :approx. 30 cm (12") diameter circle
> Range : 45 to 1000 N (4.5 to 100 Kg, 10 to 227 lbs)
> Output resistance: more than 100 KOhm (at 0 N) to 200 Ohm
> (at 1000N) in parallel with 47 KOhm
>
> Calibration [noparse]:([/noparse]force applied to center of tile)
> Voltage (use 5 V power supply)
> N Kg lb voltage
> 0 0 0 0.00
> 400 40.0 90.8 1.02
> 600 60.0 136 4.02
> 800 80.0 182 4.92
> 1000 100 227 4.96
> Power supply 5 V DC, 1 mA
> incl. cable
> Cable 5.0 m (16 ft), shielded, red wire = power, uninsulated wire =
> ground, black wire = sensor output
> Connector male plug with 3 pins in a row spaced 2.54 mm (0.100")
>
> these taptiles produce variable voltages when one steps on
> it. do i need to get A/D converter to convert these voltages to
> digital values or can i use RCtime command with RC circuit. if i
> need to use the converters can anyone suggest what to buy. i mean we
> will be having different types of converters which one would be
> better for my project.
>
>
> silpa
>
>
>
>
>
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>
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Sean T. Lamont, CTO / Chief NetNerd, Abstract Software, Inc. (ServNet)
Seattle - Bellingham - Vancouver - Portland - Everett - Tacoma - Bremerton
email: lamont@a... WWW: http://www.serv.net
"Do not fear mistakes, There Are None" - Miles Davis

Archiver

Interesting.
http://www.infusionsystems.com/products/taptile-21.shtml
They say that it is based on a force sensing resistor, so you could
probably take the resistance between the red and the black wires as
an input to an RCtime circuit on the Stamp. Just a guess.

-- Tracy


> hi ,
>
>
>i am planning to use taptiles in my project. the specifications
>given are
>
>
>Product TapTile sensor
>Version 2.1 (1998)
>Sensing parameter : contact pressure, weight
>Sensing method : force-sensitive resistor
>Active area :approx. 30 cm (12") diameter circle
>Range : 45 to 1000 N (4.5 to 100 Kg, 10 to 227 lbs)
>Output resistance: more than 100 KOhm (at 0 N) to 200 Ohm
>(at 1000N) in parallel with 47 KOhm
>
>Calibration [noparse]:([/noparse]force applied to center of tile)
> Voltage (use 5 V power supply)
> N Kg lb voltage
> 0 0 0 0.00
> 400 40.0 90.8 1.02
> 600 60.0 136 4.02
> 800 80.0 182 4.92
> 1000 100 227 4.96
>Power supply 5 V DC, 1 mA
>incl. cable
>Cable 5.0 m (16 ft), shielded, red wire = power, uninsulated wire =
>ground, black wire = sensor output
>Connector male plug with 3 pins in a row spaced 2.54 mm (0.100")
>
> these taptiles produce variable voltages when one steps on
>it. do i need to get A/D converter to convert these voltages to
>digital values or can i use RCtime command with RC circuit. if i
>need to use the converters can anyone suggest what to buy. i mean we
>will be having different types of converters which one would be
>better for my project.
>
>
>silpa
>
>
>
>
>
>To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
>from the same email address that you subscribed. Text in the
>Subject and Body of the message will be ignored.
>
>Yahoo! Groups Links
>
>
>
>

Archiver

The spec you posted gives me what I would do: just connect the output
to an IO pin and treat it like any other input switch.

For a force under 40 pounds, you get a zero out. For greater then 60
pounds, you get a one. That right there is something the Stamp can
work with.

As far as being USEFULL to your application, you'll have to tell me.
This works for an on/off condition, but if you are attempting to say
measure the weight on the taptile then this method is no good.



--- In basicstamps@yahoogroups.com, "silpa_k3" <silpa_k3@y...> wrote:
> hi ,
>
>
> i am planning to use taptiles in my project. the specifications
> given are
>
>
> Product TapTile sensor
> Version 2.1 (1998)
> Sensing parameter : contact pressure, weight
> Sensing method : force-sensitive resistor
> Active area :approx. 30 cm (12") diameter circle
> Range : 45 to 1000 N (4.5 to 100 Kg, 10 to 227 lbs)
> Output resistance: more than 100 KOhm (at 0 N) to 200 Ohm
> (at 1000N) in parallel with 47 KOhm
>
> Calibration [noparse]:([/noparse]force applied to center of tile)
> Voltage (use 5 V power supply)
> N Kg lb voltage
> 0 0 0 0.00
> 400 40.0 90.8 1.02
> 600 60.0 136 4.02
> 800 80.0 182 4.92
> 1000 100 227 4.96
> Power supply 5 V DC, 1 mA
> incl. cable
> Cable 5.0 m (16 ft), shielded, red wire = power, uninsulated wire
=
> ground, black wire = sensor output
> Connector male plug with 3 pins in a row spaced 2.54 mm (0.100")
>
> these taptiles produce variable voltages when one steps on
> it. do i need to get A/D converter to convert these voltages to
> digital values or can i use RCtime command with RC circuit. if i
> need to use the converters can anyone suggest what to buy. i mean
we
> will be having different types of converters which one would be
> better for my project.
>
>
> silpa