• on Test & Measurement
  • Published in issue 3/2015 on page 110
About the article

Ultrasonic Tape Measure

Accurately measure up to 13 ft / 4 m

Ultrasonic Tape Measure
The HC-SR04 ultrasonic sensor is produced by the Malaysian company Cytron Technology. They specialize in sensors for robotic applications in the educational sector. The sensor does not just consist of an ultrasonic transmitter and receiver but also contains a little bit of ‘intelligence’ that makes it easier to interface with a microcontroller board such as an Arduino.
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Gerber file

CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor Members can exclusively download these files for free as part of their Membership. Gerber files allow a PCB to be produced on an appropriate device available locally, or through an online PCB manufacturing service. Elektor recommends its business partner Eurocircuits as the company of choice for its own prototypes and volume production in selected cases.

Components
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The BOM (Bill of Materials) is the technically exhaustive listing of parts and other hardware items used to produce the working and tested prototype of any Elektor Labs project. The BOM file contains deeper information than the Component List published for the same project in Elektor Magazine. If required the BOM gets updated directly by our lab engineers. As a reader, you can download the list here.
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Component List

Resistors
R1 = 68?
R2 = 1k?
R3 = 10k?
P1 = 10k? multiturn trimpot (Bourns 3296W-1-103LF)

Capacitors
C1,C3,C5 = 100nF
C2 = 470µF 16V, 10mm pitch
C4 = 220µF 16V, 7.5mm pitch

Semiconductors
D1 = 1N4007
T1 = BC337-40
IC1 = ATtiny4313-20PU, programmed, Elektor Store # 130546-41 (see text)
IC2 = LM7805

Miscellaneous
LCD1 = LCD Module 2x16 characters, Fordata FDCC1602N-FLYYBW51SE
MOD1 = 4-way SIP connector to match:
HS-SR04 ultrasonic sensor
K1 = socket for roll pin
S1 = pushbutton, Alps SKHHALA010
PCB # 130546-1

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