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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.