Biomechanics Gait Analysis Lab - Biomedical Engineering ...

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Equation for 1st Inverting Amplifier V (RHeel)1 = -V FSR (R 6 /R FSR ) Eq.1 Equation for 1st Inverting Amplifier V (RHeel)2 = -V (Rheel)1 (R 9 /R 8 ) Eq.2 Equation for 1st Inverting Amplifier V (RHeel)3 = -V (Rheel)2 (R 13 /R 12 ) Eq.3 Definition of Variables R FSR Force Sensitive Resistor R All other resistors are numbered according to fig. 3.3 V (Rheel)X X represents output of matching inverting amplifier Output Voltage from FSR V FSR Figure 39: Inverting Amplifier Equations as Shown in Figure 37 Shown in Figure 40, male 4-pin LEMO (FGG.0B.304.CLAD52Z) connectors were used to connect the lead wires from the FSR insoles to the transmitter box. The lead wires were soldered into the holes, which can be seen in the rear view drawing in Figure 40c. A B C D Figure 40: Male 4-Pin LEMO Connector The following table gives the dimensions for the LEMO connector shown in Figure 40. Page 48
Metric A L M S1 S2 mm. 9.5 35.0 25.0 8.0 7.0 in. 0.37 1.38 0.98 0.31 0.28 Table 1: Measurements for figure 3.6A The male LEMO connector fits to the female LEMO connector (ECG.0B.304.CLL), which is attached to the printed circuited board in the transmitter box and shown in Figure 41 below. A B Figure 41: Female LEMO Connector The following table gives the dimensions for the LEMO connector shown in Figure 41. Metric A B e E L M N S1 S3 mm. 12.0 12.5 M9X0.6 5.5 20.7 2.5 19.1 8.2 11.0 in. 0.47 0.49 - 0.22 0.81 0.10 0.75 0.32 0.43 Table 2: Measurements for figure 41A Calibrating the FSR Insoles Devices that measure force require calibration, which is the process by which force is related to the output voltage as the resistance varies with changing force. Using the Tinius Olsen machine in compression, the following is the procedure for calibration and requires two people to perform. 1. Place one half of an insole between two hard plastic plates 2. Place them between the two grips on the Tinius Olsen machine and a pad in the larger empty spaces, so pressure is applied evenly. Page 49
Page 1 and 2: Biomechanics Gait Analysis Lab Oper
Page 3 and 4: PARTS AND ACCESSORIES The following
Page 5 and 6: Table of Contents Section Page Numb
Page 7 and 8: The new laboratory utilizes a numbe
Page 9 and 10: Figure 4: FSR Insole The FSR’s ar
Page 11 and 12: Figure 8: Transmitter Box Figure 9:
Page 13 and 14: The receiver connects directly to t
Page 15 and 16: Figure 15:Footswitch Insoles LabVIE
Page 17 and 18: Figure 17: Men’s FSR Insoles LabV
Page 19 and 20: Figure 19:Womens FSR Insoles LabVIE
Page 21 and 22: 3. Place the fanny pack around the
Page 23 and 24: Figure 25: Footswitch Output Wire C
Page 25 and 26: 14. Press the OFF button on the blo
Page 27 and 28: Figure 30: Corrected Toe Sensor Dat
Page 29 and 30: 2. Place the transmitter box into t
Page 31 and 32: 8. Mark a start line on the floor w
Page 33 and 34: Battery Replacement 1. Turn both of
Page 35 and 36: 5. Place the 3v lithium battery in
Page 37 and 38: - Dry the cleaned area with a soft
Page 39 and 40: 3. Humidity The device should not b
Page 41 and 42: The footswitches and force sensitiv
Page 43 and 44: The sensors act as a force sensing
Page 45 and 46: 10-bit analog-to-digital conversion
Page 47: Figure 38: Microprocessor Circuit f
Page 51 and 52: to supply a very small voltage (les
Page 53 and 54: A B C D Figure 45: Male LEMO Connec
Page 55 and 56: Telemetry: Transmitter Set-up Figur
Page 57 and 58: Figure 50: Receiver Circuit schemat
Page 59 and 60: The 418MHz transmitter/encoder chip
Page 61 and 62: Analog Inputs Digital Inputs Figure
Page 63 and 64: 4. Trouble-Shooting Problem Possibl
Page 65 and 66: 4- If no output coming out of the F
Page 67 and 68: 7. If the footswitches and the FSR'
Page 69 and 70: 10. If LabVIEW program is not worki
Page 71 and 72: 13. If the male LEMO connector is n
Page 73 and 74: 16. If LabVIEW program still not wo
Page 75 and 76: Page 75
Page 77: 20. If the circuit is working fine

Biomechanics Gait Analysis Lab - Biomedical Engineering ...

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