🚀 go-pugleaf

Here's the bibliography of ultrasonic detection/ranging projects that I
promised yesterday.  I would appreciate seeing other references.

o "An Ultrasonic Ranging System, Build the SonarTape"
  by Steve Ciarcia
  Byte, October 1984, pg 113
  Notes:  Uses Polaroid transducer and TI control module (combo costs
	about $60).  Interfaced to LSI display driver and LCD display.

o "Home In on the Range!  An Ultrasonic Ranging System"
  by Steve Ciarcia
  Byte, November 1980, pg 32
  Notes:  Uses Polaroid Ultrasonic Ranging System Designer's kit ($125).
	Interfaced to computer via parallel port (BCD).  Internal details
	of the ranging module are presented.  The ranging transducer is
	mounted on a computer-controlled stepper motor assembly.  See Byte,
	November 1978, page 76.

o "Ask Byte"
  by Steve Ciarcia
  Byte, November 1980, pg 266
  Notes:  Uses individual ultrasonic transmitter and receiver circuits.
	Two transmitters are provided:  one just a 555, and the other a
	555 driving a LM1812.  The receiver is an NE567 phase-locked loop.

o "Ask Byte"
  by Steve Ciarcia
  Byte, June 1982, pg 266
  Notes:  Same circuits as Byte, November 1980, pg 266.

o "Sonic Motion Detector"
  by David Benzel
  Radio Electronics, September 1984, page 51
  Notes:  Detects motion by doppler shift of continously operating
	transmitter.  Receiver requires numerous OP-amps, and discrete
	components.

o "The Electronic Scientist"
  by Forrest Mims
  Computers and Electronics, June 1983, page 84
  Notes:  Uses Polaroid Ultrasonic Ranging System Designer's kit ($150).
	Few details about the internals of the rangefinder module are
	presented.  Author adds an audible output that makes low-pitched
	thumps for nearby objects and high-pitched chirps for distant ones.

o "LM1812 Data Sheet"
  National Semiconductor Linear Databook, 1982, page 9-77
  Notes:  A one-chip solution for many ultrasonic detection and ranging
	needs.  Provides schematic of an ultrasonic ranging system that
	spans 4 inches to 6 feet in air:  one chip, two coils, three
	resistors, 8 capacitors, and a transducer.  Adding a 555 and some
	minor components yields a range of 3 feet to 20 feet.  The coils
	used appear to be strange, and perhaps hard to find.  Also
	included is schematic of 200 kHz depth sounder spanning 5 feet to
	100 feet in water.

o "AB-20 Application Brief"
  National Semiconductor Linear Applications Databook, 1986, page 1083
  by Mitchell Lee
  Notes:  Provides schematic of an ultrasonic ranging system that
	spans 4 inches to 30 feet:  one chip, two coils, four resistors,
	8 capacitors, 2 transistors, three diodes, and a Polaroid transducer.
	One coil has a strange part number, but specs are provided.
	The other is a transformer that you wind yourself from standard
	parts.  Also included is some juicy technical information, like
	a note that piezoelectric transducers "ring" for as long as 20 msec
	(masking up to 10 feet of range)!

o "Judging Distance"
  "Microprocessor Based Robotics", page 95
  by Mark Robillard
  Notes:  Provides several simple ultrasonic circuits:  555-based transmitter,
	NE567-based receiver (741 or discrete pre-amp).  Also shows a ranging
	circuit based on the LM1812:  one chip, two coils, five fixed resistors,
	two pots, 8 capacitors, and a transducer.  Adding a 555 and some minor
	components increases the range.  The coils used are standard "Miller"
	parts, and should be fairly easy to find.