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RELATED GUIDES

Analog Feedback Servos
What position is your servo in?
by Bill Earl
The very word "servo" implies feedback-based control. But for most RC servos, that feedback signal is not available outside the servo case. So when controlling them from a microcontroller, you never really know if the servo is doing what you tell it to do. These feedback servos have an extra wire for the feedback signal. This lets you monitor the servo motion to verify that it is working as expected. It also lets you use the servo as an input device.
UPDATED
Adafruit 4-Channel ADC Breakouts
A guide to the ADS1115 and ADS1015 analog converters
by Bill Earl
ADS1115 16-bit 4-channel breakout and ADS1015 12-bit 4-channel breakout boards
Electronic Demon Costume
RAAAAAWR!
by Phillip Burgess
Spark the demon is a costume featuring an Arduino-based voice changer, an animated LED matrix face and glowing EL wire wings. This short guide answers some common questions and collects links to the relevant tutorials and videos that may be helpful in your own Halloween creations.
Arduino Lesson 8. Analog Inputs
Learn Arduino, Lesson 8. Analog Inputs
by Simon Monk
This is Lesson 8 in the Learn Arduino Adafruit series. In this lesson, you will start using the Serial Monitor to display analog readings, and then extend the project using eight LEDs from lesson 4, so that you can control the number of LEDs that are lit by turning the knob on a variable resistor.