Ohm's Law Soldering

In this project, we used a PCB to show Ohm's Law, by showing how different resistors affected the current going into a LED. This shows how current decreases as resistance increases, according to the equation I=V/R. Ohm's law itself is an equation that can be best explaned as a triangle that you put 2 inputs into two get the third piece.

BUILDING THE DEVICE

The circuit itself was 8 LED's connected to 8 resistors, and 8 switches, seen in the bag on the left

I started by putting on the 8 switches, which were all connected. I ran into a problem here, as my original soldering iron had heating problems, which required me to hold it to the joint for at least 5 seconds before it could even melt solder, and even then it took 2 seconds of continuous contact to the solder to start melting it. I ended up switching soldering irons to one that worked really well, and allowed me much cleaner soldering with the LEDS than with the switch

Using the soldering iron (pictured right), I soldered on the first couple pins of the switch, which is pictured above. After switching soldering irons, I finished soldering the switch, I put the LEDS into their holes and bended the pins to allow me to solder easier. All the images on the far left are my finished project, with the backside, then front, then it working showing how current goes down with resistance.

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