Off to the races: debugging! What are voltage, current and resistance? How are they related? And why should I care? In this chapter, you will learn about voltage, current and resistance and how they interact with each other. This will help you understand how your circuits are working, and how to make adjustments to them. […]

Build the circuit step by step In order to build the basic circuit described in this chapter, you’ll need the following parts. You’ll need these parts: 2 red LEDs 1 220 ohm resistor (red, red, brown, gold) Jumper wires Breadboard. Arduino Uno USB A-B cable Computer with Arduino IDE This circuit is quite similar to […]

Electricity is flowing electrons This discussion of electricity is simplified, and relevant to the small scale electronics projects that we are building. We’ve provided some references to more thorough discussions of electricity in appendix xx. Electricity is the flow of electrons through a material. Electricity requires a closed loop to flow from beginning to end. […]

Voltage:the potential In our water system, water has a potential to fall from the upper tank, moving through the turbine to the lower tank. When the water gets to the lower tank, it has no more potential to fall (because it’s already at the lowest point in the system). If we increase the amount of […]

Current: the amount of water flowing In our water system, we can measure the amount of water that flows through the pipes. If we measure a cross section of one of the pipes at any point, we can figure out how much water passes through it in a given amount of time– for example, we […]

Resistance: restricting the flow Let’s look at how resistance might be demonstrated with the water analogy. If the pipes are wider in our water system, more water can flow through them. If the pipes are narrower, less water can flow. You could say that the amount of resistance, restriction of flow, is greater in the […]