Objectives• The Conventional Protractor

goniometer– Limitations

• Design of the Mechanical part–Movement of Transducer probe

• Project Block Diagram• Applications

2ElectrogoniometerApril 8, 2023

Conventional Goniometer

The Protractor goniometer

Elbow FlexionElbow Extension

Limitation of Conventional Goniometer• Bulky apparatus

• Less accuracy• Measuring the angle while holding

the protractor throughout measurement is difficult

• Patients with severe joint dislocation finds the conventional procedure painful

14 May 2010 4Electrogoniometer

Stationary arm

Grayscale image

Fulcrum Movable arm

Transducer probe

Protractor

PointerScrew

0⁰

90⁰

180⁰

45⁰135⁰

45⁰

90⁰

135⁰

0⁰

Movement of TransducerDesign of Mechanical part

The Grayscale sheet

April 8, 2023 Electrogoniometer 6

Parts of the electrogoniometer

Side view of Transducer probe

Project Block Diagram

μCP89C51

LCD

ADC 0808

4

3 21

7 8 9 10 11 12 13 14 65

1516

GndVcc1 K

P1.0P1.1P1.2P1.3P1.4P1.5P1.6P1.7

D0D1D2D3D4D5D6D7

P0.0P0.1P0.2P0.3P0.4P0.5P0.6P0.7

Data lines

ADD AADD BADD CSTARTALEO/P EnableEOC

P2.0P2.1P2.2P2.3P2.4P2.5P2.6

P3.4P3.5P3.6

Clock

12 16

+Vref -Vref

13

11 Vcc

Gnd

IC 555TIMER

RSR/wE

5V DC Power supply

To Port 1 of μC

Data lines

Transducer probe

IN0

5V Power Supply

1 K

Applications• Range of Motion - physiotherapy• Kinanthropometry - the interface

between anatomy and movement. • Fitness testing - flexibility testing• Bike fitting• Gait measurements• Ergonomics – designing workspace

11April 8, 2023 Electrogoniometer

Bike Fitting

Ergonomics

Gait Measurements

14 May 2010 14Electrogoniometer

Multipurpose Benches

ReferencesI. Roger Eston & Thomas Reilly: “Kinanthropometry And Exercise Physiology

Laboratory Manual” pp. Ch.4, Pg:79 – 85II. Nancy Berryman Reese, PhD, PT &William D. Bandy, PhD, PT,SCS,ATC: “Joint

Range of Motion and Muscle Length Testing”III. Centre for Nanoscale science and Technology: “Goniometer_Manual” ppIV. http://academic.scranton.edu/faculty/KOSMAHLE1/courses/PT350/goniomet/

gonue.htm: “Introduction to goniometry” V. Roger Eston, Thomas Reilly: Kinanthropometry and Exercise Physiology

Laboratory Manual Test, Procedures and Data, Volume 1.Ch.5, Pg:129 - 156 VI. Keil “Getting Started Creating applications with μVersion” Keil An ARM

Company.VII. http://academic.scranton.edu/faculty/KOSMAHLE1/courses/PT350/goniomet/

gonue.htmVIII. ADC0808/ADC0809,8-Bit μP Compatible A/D Converters with 8-

ChannelMultiplexer Data SheetIX. L7800 Series Voltage regulators Data sheetX. The Extended Concise LCD Data SheetXI. www.datasheetcatalogue.comXII. www.topendsports.com

April 8, 2023 15Electrogoniometer