CN101188048A - Wireless bicycle pedal force tester - Google Patents

Abstract

The invention relates to a wireless bicycle pedal force detector, which belongs to a bicycle pedal force detector. Including the pedal and the circuit part, the pedal and the beam are fixedly connected by screws; the pressure sensor is fixedly connected with the beam; the beam is fixedly connected with the bearing sleeve; the bearing sleeve is fixedly connected with the bicycle pedal shaft, and the circuit board is embedded in the pedal; Independent power supply, pressure sensor, amplifying circuit, A/D conversion circuit, wireless sending and receiving module, single-chip microcomputer is connected with liquid crystal display and memory; memory is connected with dual-port RAM. The invention has the advantages that the sensor is on the pedal and directly detects the force; the integrated design of the force detection circuit board and the sensor; and a wide range of application objects.

Description

Wireless bicycle pedal force tester

technical field

The invention relates to an electromechanical detection device, in particular to a detection device applied in the field of bicycle pedaling force detection.

Background technique

Initially, the detection of bicycle pedaling force was mainly obtained through photography, video and video and image analysis software to obtain human kinematic parameters, and combined with the three-dimensional force plate under experimental conditions, the corresponding power was obtained through image analysis using synchronous technology. Kinematics and kinematics parameters, analysis and comparison from two aspects of kinematics and dynamics, to explore the principles and laws of sports technology, to provide a basis for evaluating the rationality of movement technology, designing new training methods, improving sports technology movements, and improving sports performance. Theoretical basis, based on which the athletes are guided and trained; rather than the detection of speed directly through the tracking test system. This detection method is not real-time, and the dynamic performance of the data is not strong. The original data is easily inaccurate due to environmental factors, and it uses a wired transmission and reception method, which makes it very inconvenient for athletes during training. Later, many colleges and universities at home and abroad have involved in the research of pedaling force detection, mainly analyzing the pedaling technology, decomposing the pedaling force by the pedaling method, and finding out how to stretch the athlete's muscles within a week of pedaling to get the best results. fast speed. However, most of these studies are only theoretical qualitative studies, without accurate data as a basis for derivation, which makes the results of the research different from the actual riding situation.

Contents of the invention

The present invention provides a wireless bicycle pedaling force detector to solve the current problem of lack of real-time performance, weak data dynamic performance, and the original data is easily inaccurate due to environmental factors. A very inconvenient problem for athletes during training. The technical scheme that the present invention takes is: comprise pedal and circuit part: Wherein:

The pedal structure is: the pedal 2 is fixedly connected with the crossbeam 5 via the screw 4; the pressure sensor 1 is fixedly connected with the crossbeam 5; the crossbeam 5 is fixedly connected with the bearing sleeve 3; pedal inside;

Circuit part: independent power supply 1; the pressure sensor forms a full bridge circuit and is connected to the amplifier circuit; the amplifier circuit is connected to the A/D conversion circuit; the A/D conversion circuit is connected to the single-chip microcomputer; the single-chip microcomputer is connected to the encoder; the encoder is connected to the wireless transmission The receiving module one is connected; the wireless sending and receiving module one is connected with the transmitting antenna; this part of the circuit forms a circuit board one 6, which is connected with the pedal;

Independent power supply 2, the receiving antenna is connected to the wireless sending and receiving module 2; the wireless sending and receiving module 2 is connected to the decoder; the decoder is connected to the single chip microcomputer 2; the single chip microcomputer 2 is connected to the liquid crystal display and memory; Composition circuit board two is connected with the front end of the bicycle handle.

In one embodiment of the present invention, the second single-chip microcomputer is also connected with the watchdog and RS-232; the RS-232 is connected with the serial port of the microcomputer.

The specific advantages of the present invention are the following aspects:

1. The design of the sensor, on the pedal, is a direct detection of force.

Direct detection does not need to indirectly obtain the detection force through photography, video recording, and video and image analysis software processing, thus meeting the real-time requirements of detection. The direct detection of the force enhances the dynamic performance of the data and improves the reliability.

2. Integrated design of force detection circuit board and sensor.

The integrated design solves the problem that the original data is easily inaccurate due to environmental factors, and the system is small in size, light in weight, and strong in anti-interference ability. The system has high reliability, vibration-proof, waterproof, and dust-proof, which can greatly improve The adaptability of the trainers will not interrupt the training due to environmental factors.

3. Data transmission is a wireless sending and receiving system.

The wireless sending and receiving system solves the inconvenience caused by wired transmission due to the large number of data lines, and the wireless data receiving and transmitting are integrated, real-time, accurate, and strong anti-interference ability; excellent frequency stability, low transmission power, high The design of the receiving sensitivity can be directly connected to the CPU serial port, such as 8031, or connected to the computer RS232 interface, and the software programming is very convenient. The data can be processed online and offline, draw the characteristic curve of dynamic parameters, explore the principles and laws of sports technology, and provide theoretical and data basis for evaluating the rationality of action technology, designing new training methods, improving sports technology actions, and improving sports performance Based on this, guide and train athletes to improve the quality of training.

The receiving system uses a liquid crystal display to display the pedaling force in real time, which makes the instrument very humanized. Athletes can see the size of their pedaling force in real time, and can adjust the pedaling frequency and pedaling range according to their physical condition, so that they can ride more conveniently, save effort, faster, and get better results.

4. Target a wide range of objects. Not just athletes, but also fitness professionals such as teenagers or seniors.

Description of drawings

Fig. 1 a is the structural representation of pedal of the present invention;

Fig. 1b is the A-A step sectional view of Fig. 1a;

Figure 1c is a top view of Figure 1a;

Fig. 2 is a schematic diagram of a pressure sensor forming a full bridge circuit;

Fig. 3 a is a circuit block diagram of the present invention;

Fig. 3b is a circuit block diagram of another embodiment of the present invention;

Figure 4 is a schematic diagram of the wireless transmitting and receiving circuit.

Detailed ways

Includes pedal and circuit sections, where:

The pedal structure is: the pedal 2 is fixedly connected with the crossbeam 5 via the screw 4; the pressure sensor 1 is fixedly connected with the crossbeam 5; the crossbeam 5 is fixedly connected with the bearing sleeve 3; Pedal inside.

Circuit part: independent power supply 1; the pressure sensor forms a full bridge circuit and is connected to the amplifier circuit; the amplifier circuit is connected to the A/D conversion circuit; the A/D conversion circuit is connected to the single-chip microcomputer; the single-chip microcomputer is connected to the encoder; the encoder is connected to the wireless transmission The receiving module one is connected; the wireless sending and receiving module one is connected with the transmitting antenna; this part of the circuit constitutes the circuit board one 6 and is connected with the pedal;

Independent power supply 2, the receiving antenna is connected to the wireless sending and receiving module 2; the wireless sending and receiving module 2 is connected to the decoder; the decoder is connected to the single chip microcomputer 2; the single chip microcomputer 2 is connected to the liquid crystal display and memory; Composition circuit board two is connected with the front end of the bicycle handle.

In one embodiment of the present invention, the second single-chip microcomputer is also connected with the watchdog and RS-232; the RS-232 is connected with the serial port of the microcomputer.

1. The DTY-1 pressure sensor is attached to the pedal crossbeam, and the sensor lead-out line adopts the integrated design of the DC bridge and the wireless sending and receiving circuit for data acquisition, and is fixed under the pedal.

2. The acquisition and transmission part is powered by an independent power supply; firstly, the pressure value is collected through the pedal pressure sensor DTY-1, and then the analog signal output by the sensor is amplified and processed, converted into a digital signal by ADC, and converted into a digital signal by the encoding chip PT2262. The digital signal is encoded, and then sent out through the radio frequency circuit composed of the transceiver chip nRF401.

3. For the receiving and displaying part: the independent storage battery 2 supplies power; the circuit composed of the transceiver chip nRF401 receives the digital signal and decodes it by PT2272, and the result is stored in the C8051F120 single-chip microcomputer, and the value is displayed on the liquid crystal display MDL(S)-20268 20×2.

4. For the extended FLASH memory AT45DB081, it can save bicycle pedal force data, fault data, channel number and fault time for a long time in the case of power failure, and use dual-port RAM and USB interface to process data offline.

5. The wireless receiving and transmitting system PTR2000 (attached figure 4) integrates receiving and transmitting. The PTR2000 wireless transmitting and receiving module is not only small in size, but also has a remarkable advantage that it can be directly connected with a single-chip microcomputer. The method of connection is also very simple. Use the DI of the PTR2000 wireless MODEM to connect the serial port of the single chip microcomputer to broadcast. The DO of the PTR2000 wireless MODEM is connected to the serial port of the single chip microcomputer to receive. The I/O control module of the microcontroller can be used for emission control, channel switching and low power consumption mode.

Claims (2)

1. A wireless bicycle pedaling force detector, characterized in that it includes pedaling and circuit parts: wherein: The pedal structure is as follows: the pedal (2) is fixedly connected to the beam (5) via screws (4); the pressure sensor (1) is fixedly connected to the beam (5); the beam (5) is fixedly connected to the bearing sleeve (3); the bearing sleeve (3) It is fixedly connected with the bicycle pedal shaft, and the circuit board (6) is embedded in the pedal; Circuit part: independent power supply 1; the pressure sensor forms a full bridge circuit and is connected to the amplifier circuit; the amplifier circuit is connected to the A/D conversion circuit; the A/D conversion circuit is connected to the single-chip microcomputer; the single-chip microcomputer is connected to the encoder; the encoder is connected to the wireless transmission The receiving module one is connected; the wireless sending and receiving module one is connected with the transmitting antenna; this part of the circuit forms a circuit board one (6), which is connected with the pedal; Independent power supply 2, the receiving antenna is connected to the wireless sending and receiving module 2; the wireless sending and receiving module 2 is connected to the decoder; the decoder is connected to the single chip microcomputer 2; the single chip microcomputer 2 is connected to the liquid crystal display and memory; Composition circuit board two is connected with the front end of the bicycle handle. 2. The wireless bicycle pedaling force detector according to claim 1, characterized in that: the second single-chip microcomputer can also be connected with watchdog and RS-232; RS-232 is connected with the microcomputer serial port.

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