Zeppelin Design Labs VPM-1, Инструкция по сборке

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SETTING UP STEREO CONFIGURATION
The stereo configuration setup is an automatic process handled by the VPM-1 microcontroller. During
this process the microcontroller tests the two sets of optocouplers (for the left and right channels)
and internally populates two tables of LDR resistance values for given LED brightness levels. The
microcontroller then compares the two tables and adjusts the values of one to match the other. Because
of this process, plus the fact that we hand select the matched pairs of LDR’s, the stereo channels will
be very close in volume to each other. The microcontroller’s matching data is stored permanently,
so this setup process is only required one time for the life of the pedal. All you need to do is set up
some header jumpers on the main board and plug in the power; the rest of the process is automatic.
However, it does take a long time -- usually about ten minutes. As long as you see the LED blinking, be
assured the VPM-1 is hard at work. Follow these steps:
1. Set the calibration jumpers on headers CAL1, CAL2, CAL3, CAL4, CAL5, CAL6 (177). The headers
outlined in red should be jumped (178, not labeled).
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2. Plug in the power to the main board module. The ribbon cable of the sensor board does not need
to be connected. The LED will blink red while thinking, and will take several minutes to complete.
It will blink a total of 256 times, if you care to count. When the process is done, the LED will flash
green rapidly. You can now disconnect the power.
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