28125 Parallax Inc, 28125 Datasheet - Page 253

• Manufacturer Part Number: 28125
• Description: TEXT ROBOTICS
• Manufacturer: Parallax Inc

Specifications of 28125

• Title: Robotics with the Boe-Bot
• Product: Microcontroller Accessories
• Lead Free Status / RoHS Status: Not applicable / Not applicable

P15
P14
P13
P12
P11
P10
P9
P8
P7
P6
P5
P4
P3
P2
P1
P0
X2
X3
To Servos
Testing the IR Pairs Using the FREQOUT Trick
The
of the
synthesized tones is that they contain signals called harmonics. A harmonic is a higher
frequency tone that’s mixed in with the tone you want to hear. These tones are outside
human abilities to detect sound, which tend to range from 20 Hz to 20 kHz. The
harmonics generated by the
can directly control these harmonics using
activity, you will use the command
that lasts 1 ms to P8. The infrared LED circuit connected to P8 will broadcast this
harmonic. If the infrared light is reflected back to the Boe-Bot by an object in its path,
the infrared detector will send the BASIC Stamp a signal to let it know that the reflected
infrared light was detected.
Board of Education
Rev C
Vdd
+
FREQOUT
15 14
X4
FREQOUT
Vdd
Vin
© 2000-2003
13 12
X5
Vss
command was designed mainly to synthesize audio tones. The actual range
Red
Black
command is 1 to 32768 Hz. One interesting phenomenon of digitally
anode
leads
FREQOUT
HomeWork Board
FREQOUT 8, 1, 38500
command start at 32769 Hz and go upward. You
P15
P14
P13
P12
P11
P10
P9
P8
P7
P6
P5
P4
P3
P2
P1
P0
To Servos
X2
X3
[phone]
www.parallax.com
www.stampsinclass.com
Vdd
Freq1
+
Vin
arguments above 32768. In this
Vss
Rev B
to send a 38.5 kHz harmonic
anode
leads
Figure 7-5
Wiring
Diagrams for
Infrared
Emitter and
Receiver
Circuits
Board of
Education
(left) and
HomeWork
Board (right).