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I am a beginner to Arduino, and a relative beginner to electronics in general. I have the official Arduino Starter Kit. I've looked through my bag of components looking for a black diode but was unable to find it among all of the LEDS & the other black components.

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    Maybe show us some pictures of what you do have... – Majenko♦ Feb 7 '17 at 22:04
  • What is Google? – Bort Feb 8 '17 at 2:36
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While the ArduinoStarterKit page at arduino.cc lists “5 Diodes [1N4007]” as part of it, and has a picture where 5 diodes apparently appear slightly left of center in the top row, several other pictures that come up in a google images search for official Arduino Starter Kit apparently don't show the diodes. Eg, as at arduino starter kit. But 4 Best Starter Kits for Arduino Beginners does show them.

Note, unless you are working with medium to high AC voltages (eg above 50 V) you can substitute 1N4001 - 1N4004 which have lower PIV ratings but also slightly lower forward voltage drop. For many beginning projects, 1N4148 signal diodes will be adequate and perhaps less expensive.

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1N4007 are usually black with a white stipe indicating the cathode. Use a magnifying glass and you should be able to see the marking.

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This is image of 1N4007 diodes. I think now you can find them easily.

enter image description here

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They are stuck next to a string of resistors.

Diodes and resistors

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