JavaScript on Things

Chapter 3. How to build circuits

This chapter covers

• Using Ohm’s law to manipulate voltage, current, and resistance in a circuit
• Prototyping basic circuits on breadboards
• The difference between parallel and series circuits
• Nitty-gritty details about LEDs and how to wire them up in several useful configurations
• Identifying and selecting the right resistor for different circuits and components
• Calculating the resistance in a series circuit and a parallel circuit

For this chapter, you’ll need

• 1 Arduino Uno
• 4 standard LEDs, red
• 4 220 V resistors
• 4 560 V resistors
• 1 100 V resistor
• 1 push-button switch
• 1 9 V battery
• 1 9 V battery snap ...