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I could use this unit that Kevin Timmerman designed! I have the same digital caliper that he designed the serial interface for. "The caliper sends a burst of data approximately three times each second. Each burst contains 48 bits of data as shown in timing.pdf. The first 24 bits are the position relative to the zero point set on the caliper. The second 24 bits are the position relative to an arbitrary zero that does not change. This is sort of an absolute position, but the zero point changes each time the caliper loses power. Each 24 bit value is in ones compliment form (1 sign bit, 23 data bits). This allows for a 0 and a -0. The unit of measure is 1/20480th of an inch. The caliper is normally powered by a small 1.55 volt battery. The positive of the battery is connected to the metal parts of the caliper making it positive ground. The logic levels are -1.55 volts low and 0 volts high. The clock and data signals from the caliper are AC coupled by C1 and C2. The AC coupling effectively moves the logic levels above ground so they can be easily converted to standard CMOS logic levels (0 and +5 volts). Three gates of IC1 are used as a 3.3x linear amplifier. The amplifier is driven to saturation by the low logic levels from the caliper. The data and clock signals are then sent to the 12C509 microcontroller."
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October 10th, 2008
You can do the same wait a single 8pin PIC see: billtodd.webhop.net
October 10th, 2008
Sweet! I’ve got the same digital calipers. Might have to play around this weekend.
October 10th, 2008
Thats pretty Sweet.
October 14th, 2008
These calipers are at Harbor Freight, for like $6 each. I have 4 of them at the house.
November 30th, 2008
Tresna Instrument also has the same calipers. (http://www.tresnainstrument.com)
August 18th, 2010
Has anyone experienced using the digital interface of the caliper with Labview program? I am interested
in customising its output with other sensors in my project through labview. Plz reply if you can help in
any way. Thanks.