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This is a carpenters' String Level' available
in many hardware stores for $3.00. When level, the bubble will be between the two
witness marks. |
| The light sensor is one of HiTechnic
Products* EOPD units (ED2010), which resembles a standard LEGO light sensor, is assembled
as shown on the right. I have tried using a LEGO unit without success. *With a big thank-you to John Barnes |
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The string hanger holes seem to fit the
yellow component nicely, allowing the spirit level to become part of the assembly. |
| And now the final assembly. Note that
the it pivots to place the spirit level on top of the light sensor. |
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What you see on the left are the XY axes with
the spirit-level and light sensors locked securely to them (look for the green
blocks). Pivoting in the XZ plane will be detected by the level on the Y axis and
pivoting in the YZ plane will be detected by the level on the X axis. |
| On the right see the XZ plot in red and the
YZ plot in blue, taken at 1 second intervals. When the edge of the bubble passes the
light detector there is a difference of at least 15 light units. We now have a LEGO Level Sensor to use in the project!! |
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And, on to the
project...!!
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