Week 11: Input Devices

Assignment

• Probe an input device(s)’s analog levels and digital signals

For this assignment, we’re going to use Miniware DS13 Digital Oscilloscope. For complete guides on how to setup and operate oscilloscope, please refer to our Week 8 group assignment. So we will just go straight to observe the signal generated here.

Probing Digital Signals Devices

Rotary Encoder

Setup

Result

Clockwise Rotation: the blue signal line rises first

Counter-clockwise Rotation: the green signal line rises first

Rapid Rotation:

Probing Analog Signals Devices

Potentiometer

Setup

Result

Scale setting: Volts/div: 2V (DC), Time: 500 mS,

LDR or Photo-Resistor Sensor

Setup

Result

Scale setting: Volts/div: 0.2V (DC), Time: 200 mS

Scale setting: Volts/div: 0.5V (DC), Time: 200 mS