28129 Parallax Inc, 28129 Datasheet - Page 130

• Manufacturer Part Number: 28129
• Description: TEXT BASIC ANALOG & DIGITAL
• Manufacturer: Parallax Inc
• Type: Programmingr

Specifications of 28129

• Style: Book
• Title: Basic Analog and Digital
• Contents: Basic Analog and Digital Text
• Product: Microcontroller Accessories
• Lead Free Status / RoHS Status: Not applicable / Not applicable

Questions
Challenge!
1. Given four different frequencies of sound, 3.5 Hz, 350 Hz, 3,500 Hz, 35,000 Hz,
2. Explain aliasing. If a signal is sampled at 1 kHz, how low can the signal's
3. For the circuit in Figure 6-8, what resistance value does the pot have to be to
4. Construct a PBASIC command to declare an array of 5 nibbles. Make a
1. In Program Listing 6.2 Revision 2, the frequency samples we took were once
2. Design a program to record and play back tones. Make it so that the recorded
3. Design and build the circuit to implement the design from Challenge 2. You'll
4. Add two pushbuttons to the system developed in Challenge 2 and 3 so that you
which ones can you hear and which ones can't you hear? Explain your answers.
Also, compare the pitch of the sounds you can hear.
frequency get before aliasing is guaranteed?
make the astable multivibrator circuit generate a 2 kHz signal? This requires
some algebra.
command that sets the fist nibble in the array equal to the fifth nibble in the
array.
every 1-second because the count command counted for a second. Revise the
program listing to count the frequency samples for ½ of a second. Make sure
your output data is correct by comparing output of the revised program to output
of the original for a known frequency. Fix any bugs
tone is played on one speaker, and the playback tone is sent to a second speaker.
Add a function to the program that shuts the 555 timer off by sending a low
signal to pin-5 on the timer when you want to hear the playback signal. Hint:
You can combine two of one of the program listings from Chapter #5 with a
program listing from this experiment, and you'll be almost done. All you'll have
to do is program the control signal that disables the 555 timer.
need to be creative about finding enough space on the breadboard.
can control when to record and play back single sound samples. Now you'll need
to be really creative about finding enough space on the breadboard. Use 10 k