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An analog frequency and digital frequency from the microphone can also be read by loading the
program Prog5.dl8
Fig. 15.
Tap the microphone sharply with your finger or a pencil.
The resistance of the speaker coil (nominally 8 Ohm) can be read by the program Prog6.dl8
Fig. 16.
This repeatedly outputs an excitation current into the speaker coil, which will also drive the device as a
speaker producing a soft beep as each reading is taken.
6.5
Light Sensor (Labelled 5V)
The light sensor is a silicon photodiode which outputs a voltage and current proportional to the
ambient light intensity. The photodiode output current and voltage can be read by Prog7.dl8
Fig. 17.
Shade the sensor, or shine brighter light onto it to change the readings.
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