![]() Again, Adafruit and SparkFun carry affordable oscilloscopes. Throughout the book, however, you will see screen captures of an oscilloscope to show various signals, and it should become evident just how helpful they can be. This is a more expensive tool, and will be less necessary for these circuits. ![]() ![]() More helpful than a multimeter for debugging tools such as PWM and serial protocols is an oscilloscope, which shows you a plot of voltage over time to visualize many different signals in a circuit. Though not essential, I would highly recommend having some sort of multimeter on hand when building the circuits in this book. While these are not high quality measurement tools, they are certainly suitable for these circuits. Both SparkFun and Adafruit carry very affordable digital multimeters. The most useful for the circuits in this book will be a multimeter, which is a tool that measures voltage and current, and often additional properties such as resistance, capacitance, and frequency. There are many tools that can greatly reduce the time it takes to fix these problems. Just like with software, it is inevitable when assembling hardware that things won't always work the first time. That should provide enough breadboard space and jumper wires to assemble most, if not all, of the demo circuits in this book.
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