You’ve seen a lot of examples of powering LEDs—turning them on and off from our IoT device.1 There are a lot of interesting things you can do with LEDs. For example, have you wondered how a power meter works? If you have used high end audio equipment, such as a studio sound board, you may have seen a power meter that has several segments ranging from green to yellow to red where green means the level is low, yellow is medium, and red is high. You can duplicate this behavior with a set of LEDs and your IoT device. Yes, you’re going to build a fancy LED power meter!
While ...
