Lab 1: components

  1. Power jack: How much we’ll be using power jack instead of just plugging in USB to a computer? What’s the advantage of power jack over USB & the computer?
  2. Potentiometer: why did I burn my potentiometer? I guess I forgot to add resistor, but not sure why I need it as it says that potentiometer itself acts as a variable resistor. Picture below:

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Update: everything worked fine when following class schematic, but I still don’t get what’s the difference (I added resistance to my scheme now).

3. Photocells, thermistors, capacitors, diodes, transistors: can we try building some circuits to see how they work in reality? It’s very hard to have questions from just reading a theory.

Lab 2: 1) setting up a breadboard

Instead of using a power jack I’ve used Arduino to power my breadboard. Components used: breadboard, Arduino, 2 wires (red for power and black for ground) — red wire is plugged in to 5V on Arduino and red vertical line on the breadboard, black plugged to Ground on Arduino and black vertical line on the breadboard:


Lab 2: 2) different ways to light LED

Here are few ways how to light my Arduino (always ALWAYS unplug from the power supply before adding / changing / removing any of the components on the breadboard). Wire colors are messed up right now because I haven’t picked up enough red / black from the shop but in the future it will always be as red for power and black for ground:

IMG_1311 IMG_1312 IMG_1314

Question: In the first photo LED is connecting both sides of the breadboard, would that work with any component as long as it’s a closed loop? (In this case I suppose LED is taking a wire role).

Lab2: 3) LEDs in parallel and in series

The circuit in parallel is very similar to the simple LED circuit, the only thing is that you add more LEDs. In the picture below I have 3, each of their anodes and cathodes have to be in the same horizontal line as the previous LED. And anodes connected to the resistor and power, and cathode with the ground. All of the LEDs get the same amount of 2V power (we have 3V resistor).



The circuit in series (picture above) means that LEDs are going one after another and that the 2V power will be divided between two LEDs. It’s still enough to light both of them but the light won’t be so bright.

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