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Week 3: Computer controlled cutting Week 4: Electronics production Week 5: 3D Scanning and printing Week 6: Embedded programming Week 7: Computer controlled machining Week 8: Electronics design Week 9: Output devices Week 10: Mechanical design & machine design Week 11: Input devices Week 12: Molding and casting Week 13: Networking and communications Week 14: Interface and application programming
About the lab

Week 11

Input Devices

Group Assignment

Probe an input device's analog levels and digital signals

We used an oscilloscope to measure varying signals from three boards.

We started by measuring the Modular Things stepper board we used in our Machine Week group project. The Ground probe was connected to Ground on the board and the other probe was connected to one of the pins for the stepper motor.

The code we used to run the stepper motor had an acceleration parameter, that is why the oscilloscope shows a gradual incline. If the code had a constant speed the oscilloscope would show a straight line.

We also used an oscilloscope to probe an input device, a DHT22 Temperature/Humidity sensor. The Ground probe was connected to the Ground on the board and the other probe was connected to the digital signal pin on the DHT22 sensor.

We also probed a RGB LED strip. The Ground probe was connected to the Ground on the LED strip and the other probe was connected to the digital pin on the LED strip.