After the difficulty of last week’s build that we ultimately
tracked down to a faulty lead, we decided to bring out my multi-tester before
we got started. I definitely recommend having one of these on hand. It’s great
for checking suspect components and peeking inside the circuit, although I definitely
recommend a digital model for the precision it offers.
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| A decent multi-meter isn't expensive, this one is $17.25 on Amazon, and serviceable digital models can be found for $5-$6. |
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| The suspect lead from last week. |
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| Checking the meter to verify it’s working correctly, it should read close to zero. The meter is set to read ohms (resistance). |
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| No continuity |
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| Into the trash with you! |
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| Sketch 2 - Everything seems to be working. |
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| A close up of the breadboard. |
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Before modifying the program, we wanted to try some variations on the circuit
that might yield similar results to upcoming sketches so we moved the LED to
the breadboard.
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| The potentiometer is connected using one pole and the wiper – technically a variable resistor. |
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| Dialing it down. (The multi-meter read about 100 ohms at this setting) |
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| There’s not much change to the light output after this point. |
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| Same thing with a photo-resistor. |
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| Sketch 3x - “Look Ma, no hands” |
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| Sketch 5 - Combining two circuits to turn on AND adjust LED brightness with one button. |
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