11. Input devices

Group assignment

• Measure the analog levels and digital signals in an input device

Measure signals

We measured following signals with the board created at individual work.

• Analog signal = Light sensor data
• Digital signal = Serial data

Tool:

• Tektronix TBS1052B ( Manual)

Serial data signal

Transmitting the light sensor data consists of 2 byte, ADC High and ADC Low.
The baud rate is 9600bps. So the width of a bit is: 1000ms / 9600 = 0.104ms. We can read the data as follows.

Light sensor signal

We attached the probe to light sensor and measured the analogue level. The signal was upped about 500mv when the sensor was covered.