Sensors and sensing electrical signal digital signal.

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Presentation transcript:

Sensors and sensing electrical signal digital signal

LEGO sensors RCX sensors NXT sensors RJ12 connector 6 wire cable 2 wire cable 2x2 plate connector

stimuli sensorcontrol program AD sensors Temperature Sound Light I2C sensors Ultrasonic analog quantity, e.g. light digital quantity, e.g. light % interface

I2C AD converter

Step 1 Step 2

RCX input portRCX touch sensor V(off) = 5 V V(on) = 5 *500/( ) V = 0.24 V V(through R) = 5*R/(R+10000) Raw Value(R) = 1023 * R/(R+10000) Raw Value(500) = 1023 * 500/( ) = 49 Raw Value(inf) = 1023 * inf/(inf+10000) = ohm R ohm 5 V 0 V Voltage divider

Passive sensors touch, temperature Active sensors light, rotation

Passive sensors touch, temperature Active sensors light, rotation

Raw Value(R) = 1023 * R/(R+10000) ohm ohm R ohm 5 V 0 V

Signal-to-symbol stimuli sensorcontrol programinterface raw value resistance raw value temperature raw value on/off raw value clap raw value black/white time of flight distance

(57,28) (27,24)

Measured Distance = 23/cos(30) ~ 27 cm 23 cm Ialt 57 grader 27 30

Embedded Java The leJOS API classes provide access to the hardware. Especially the sensor ports and sensors: TouchSensor LightSensor UltrasonicSensor SensorPort

Interpret raw sensor value as pressed/released

Lesson 1, Line follower

Lesson 2, Tracker and Wall follower

AD sensors Temperature Sound Light I2C sensors Ultrasonic Compass Accelerometer RFID GPS

AD sensors Temperature Sound Light

I2C sensors Ultrasonic Compass Accelerometer RFID GPS

Lesson 2, Tracker and Wall follower