The hip action based SPCE061A Tester design

Describes SPCE061A MCU based hip forcing Tester system structure and software development process, focused on the tester's Load method, and using the optical encoder for speed and phase.

Tester to SPCE061A microcontroller to control core, equipped with a serial communications port, equipped with PC real-time monitoring, data preservation and reproduction, test data offline analysis and other functions. Experiments have proven that the thermometer has measurement accuracy, high stability and manipulate the friendly interface. 1 introduction with sports training scientific level, human necessity of special strength training in prominence. Through the large number of practical exercises to test the overall analysis of the data found that all running and jumping sports and to run, jump-based sports athletes, their power to stretch are significantly smaller than forward downwards or stretch forces. But the power to stretch after it is run, jump campaign momentum necessary special strength. Therefore, the design and development of a set of practical and accurate hip forcing tester, for accurate quantification of the athlete's coach training, as well as reasonable to develop targeted training programme, and thus ultimately to improve players ' scores, has a very important reference value. This article covers hip forcing tester to Sunplus company launched 16-bit MCU core parts, SPCE061A comprehensive reference of existing technologies, through the tester hardware design of rational planning, full-chip itself integrated numerous system-level functional unit, effectively reducing the hardware costs, high reliability and stability. The hip forcing Tester major: (1) measuring players legs followers tread forcing immediate strength values; (2) measuring players legs and push force synchronization of real-time speed value; (3) through the host computer real-time display of the applied force, speed and power of specific numerical and curve; (4) with data replication capabilities. You can save and compare test data. 2 system architecture of forcing Tester structure diagram shown in Figure l. The system consists of data acquisition and processing circuits, control centre and PC real-time data, curve shows the 3 parts.

Forcing collection circuit will hip forcing to analog form is passed to the microcontroller I/O port.

By SCM itself integrated 10-bit high speed A/D converter, will force a value into a control system the amount of available numbers. Speed acquisition by encoder and phase circuit. Encoder output for Digital pulse through SCM operations processed, forcing immediate line rate, phase circuits to the MCU provides the force direction. Micro-controller with 16-bit MCU SPCE061A Sunplus, its maximum operating frequency is 49.15MHz, 32-bit programmable multifunction I/O port for connection of various peripheral devices, on-chip integrated 7-channel 10-bit voltage-to-digital converter (ADC) and single-channel audio ADC with rich interrupt resource, especially suitable for real-time performance requirements strict control system. Serial port-level conversion circuit finishes RS232 level standard and conversion-chip-level standards in order to achieve the tester and PC real-time full-duplex data communication. Users can host computer control and real-time observations and save training data, and the ability to set the parameters of the test instrument. 3 data collection and processing of forcing Tester requires measurement and display of data including hip forcing, and forcing the instantaneous velocity and power values. Where hip forcing data acquisition by force sensor and transmitter complete, instantaneous speed acquisition by encoder and phase circuit. Power by force and speed of the product. 3.1 hip measurement of forces by forcing the force sensor acquisition, its analog voltage signal transducer amplifier and linearization processed, sent to the internal integration of ADC SPCE061A finish-to-analog conversion. 3.1.1 force sensor works the tester takes the strain-type force sensor completes acquisition of forcing. Strain type force sensor by elastic sensitive components and electrical resistance strain gages. When elastic sensitive components from the measured force, will result in the displacement and strain, while enabling pasting in elastic sensitive element of resistance strain gages for resistance to change. Thus, by measuring the electrical resistance strain gages for resistance to change, you can determine the size of the measured force. Force acquisition circuit internal equivalent circuit diagram shown in Figure 2.

Of these, Rl is pasted in the elastic sensitive element of resistance strain gages.

R1-R4 composition single arm DC bridge, the bridge circuit resistance changes to bridge output voltage changes. The figure shows, the bridge of the output voltage to the bridge output voltage Uo and resistance strain gauge resistance change △ Rl linear relationship. Combination of the foregoing, bridge output voltage Uo changes reflect the force size changes. So by measuring bridge output voltage Uo, can realize the size of the force. Force sensor output signal voltage Uo enlarged by transmitter and linearization, composed of double-side input signals into a single-ended output Uo signal Usample. Analog voltage Usample and the measured force linear correlation, to subsequent ADC circuit (ADC) complete analog to digital converter. Transmitter in precision transmission amplification circuit generally use three operational amplifiers differential amplification circuit, it has a high input impedance and common-mode rejection ratio, and through internal resistor coupling circuit effectively reduces the temperature drift, and ensure the accuracy of the measurement.