The Vernier Digital Control Unit (DCU) makes it easy to control DC electrical devices, such as LEDs, buzzers, and lamps. DCU projects are a great way to teach concepts in electronics, sensors, feedback and control, automation, and other engineering topics. The VernierLib library contains functions that support control of the DCU.
The DCU should be connected to the Digital 2 port on the Vernier Arduino Interface Shield or a Digital Protoboard Adapter wired to Arduino pins 6, 7, 8, and 9 as explained in the Connecting Vernier Sensors to the Arduino Using a Breadboard section (be sure to use the wiring instructions for a second Digital Protoboard Adapter). An LED on the DCU will provide feedback when it is properly connected. There are two ways to connect your electrical device to the DCU: connect your electrical device to the DCU header pins or screw the electrical device’s wires into the DCU’s screw terminal. Once the electrical device is attached to the DCU, an external power supply, such as the LabQuest Power Supply (not included), may be required to power the device.