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Step 6Now we test!
I used a Breadboard Voltage Regulator Kit to do this test, but any 3~9VDC power supply will do. Plug it in to the proper sides of the power rails (red = + , blue = -), and your indicator LED should light up bright, shooting a bright beam through your clear breadboard!
No? Try reversing the polarity of your power supply. Now does it work? No? Hrm. The LED should light using this power supply in one of these orientations. If hooking up power one way doesn't work, swapping the leads around definitely should.
Either you have a bad LED, shorted wires, or an incomplete solder connection.
If it lit up the wrong way around... well, now you have to make the decision whether to leave it like this, or desolder your LED and turn it around. Making it right is definitely the wisest course of action.
No? Try reversing the polarity of your power supply. Now does it work? No? Hrm. The LED should light using this power supply in one of these orientations. If hooking up power one way doesn't work, swapping the leads around definitely should.
Either you have a bad LED, shorted wires, or an incomplete solder connection.
If it lit up the wrong way around... well, now you have to make the decision whether to leave it like this, or desolder your LED and turn it around. Making it right is definitely the wisest course of action.
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