Is It Ripe Color Circuit

[amyCC]

Posted on behalf of student/family
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I've attached a photo of the circuit. We used the slide show on the website but then also tried the youtube version since they were slightly different.

Please let us know what we are doing wrong. We were trying to use it for a science fair project.

Project directions: https://www.sciencebuddies.org/science- ... pe-produce

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[bfinio]

Hello,

First, I would highly recommend watching our "how to use a breadboard" tutorial video if you haven't already: https://youtu.be/6WReFkfrUIk?si=_5DDadsCIsNA0uPe. The rest of this will make a lot more sense if you watch that first.

First, an explanation as to why our videos and diagrams in the written instructions might not always match. Sometimes we need to rearrange the diagrams because of the way the software shows "tall" components like LEDs. In this case I needed to rotate the LED by 90 degrees so it wasn't blocking other parts on the breadboard. But the arrangement in the video and in the breadboard diagram are electrically equivalent (this is where watching the video above will help).

In your case, you have one leg of the LED in the wrong breadboard row. Via the jumper wires, your LED is connected directly to the power and ground buses at all times (again, understanding how the breadboard holes are connected is important here), so it will just always be on. You need to move the leg over one row, from row 26 to the currently unoccupied row 25, which is connected to the middle pin of the MOSFET. This will allow the MOSFET to turn your LED on and off. Please let us know if that solves the issue.

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