Because the diodes drop 0.7V, this effectively runs it in 1.9V which didn't cause any issues for me, plus it allows the data and clock lines to be directly connected without any issues of level shifting (although I used a couple of resistors, just in case). I added a diode between the V- and GND and a diode between V+ and 3.3V.
This simplifies the circuit because you only need 2 diodes. I made a few edits: For the hardware, I used a 3.3V arduino. Out = digitalRead(dataIn)+digitalRead(dataIn)+digitalRead(dataIn) // Tripple sampling to remove glitches If the length of the binary strings changes a lot you may have the clock and data pins the wrong way around.
#Screen calipers serial number code#
Hopefully this code should mean when you connect your Arduino to the computer and use the serial monitor at 115200 Baud you will get sensible looking binary out. The main requirement of this code is that the data is read on the falling edge of a clock pulse. Digimatic Caliper + DIAL TI, BAS Digimatic Caliper + Square Head About this item Measures 0 to 8' (0 to 200mm) in 0.0005' (0. CSV files to import the data into spreadsheets. There are commas in between each value to make it easy to use. This is a very basic Arduino code that should be compatible with several calliper data protocols. Red and IR LEDs tend to have low voltage drops across them. I used a red LED with a 1.8V drop across it. 2V or more rating.įor the LED try to find one which has as close to a 1.6V drop across it as possible. there is about 1 mm of slop between the jaws like Isak's video shows, the genuine one has no play.
#Screen calipers serial number serial number#
I used a 10uF which worked well, but there would be no harm in using a larger capacitance. the serial number on the caliper is different than the one on the inspection document. This method relies on using an LED to regulate the supply voltage for the callipers.
To avoid needing a battery in the callipers the power circuit pictured can be used (remove the button cell). My Arduino changed between logic high and logic low at about 2.5V (this could vary a bit between boards).Ĭonnecting the positive pin on the callipers to the 3.3V supply means when the clock and data pins are connected to the arduino their voltage seems to vary between 3.3V and 1.8V, which is the Arduino reads as logic high and low respectively. This is a bit of a bodge and may not always work, really a proper logic level conversion circuit should be used but the flowing is a simple hack that worked well with my Arduino: Below the caliper part number is this specific caliper’s serial number. The Arduino uses 5V logic but the callipers output 1.5V logic. The complete part number for the caliper in the image below is CP5060-23S4L.
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