JavaScript on Things

Chapter 4. Sensors and input

This chapter covers

• The role sensors play in projects as transducers, converting physical phenomena to electrical signals
• How microcontrollers use analog-to-digital conversion (ADC) to interpret incoming analog signals
• Building voltage divider circuits to read resistive sensors like photoresistors
• Using Johnny-Five’s generic Sensor class to read sensor data and listen for data and changes
• Taking advantage of Johnny-Five’s component-specific Thermometer and Button classes
• Managing default digital logic levels using pull-down resistors

To build nifty gadgets, whether they’re temperature-controlled automatic fans or more interesting inventions, you’ve got to be able to gather information and input from the real, ...