- Digital Readout -
Description
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Project
The DRO project realizes a digital readout (DRO) for mills, lathes or other devices using linear magnetic strips with a magnetic pole length over both poles (N and S) of 2 mm. It contains the sensor PCB that is based on an Austria Microsystems AS5311 encoder chip and a 3 channel display PCB that is based on an Atmel ATMega8 microcontroller for each channel.
Magnetic strips are cheaper and smaller but a little less accurate than glass scales. On the other hand, they are more accurate, more reliable and faster than digital caliper based readouts.
Basic features
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DRO with 3 fully separate display blocks with 7-segment LED displays - Six digits plus sign. It is possible to build the display for 1, 2 or 3 channels as the display blocks are fully separate.
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Maximum resolution on display is 0.001mm. Option to round values to 0.005mm steps. Display shows inch or metric values.
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Overall accuracy is strip-dependent. The resolution of the Austria Microsystems AS5311 is 488nm.
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Two push buttons per channel to zero the scale and to switch it to relative mode.
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Selectable lathe mode doubles the distance shown.
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Simple menu to set different values that are stored in the controller EEProm.
Included in the project files
All files and sourcecode needed to build the DRO are included in a single ZIP file.