Description: a simple implementation of a frequency meter with
the BCD-counter and the 7-segment LED display Platform: |
Size: 12288 |
Author:wangfeng |
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Description: 此设计以单片机STC89C51为核心，由声音传感器采集脉搏信号，经过LM324前置放大电路、滤波电路和比较电路后得到与脉搏相关的脉冲信号，将该脉冲信号作为定时/计数器T1中断信号交由单片机进行脉冲周期的计算，T0做定时器。然后得出每分钟的脉搏搏动次数(即心率)，并将结果1602LCD上显示心率。在对人体脉搏检测时，具有检错排错的功能。若出现误操作（如不小心移动时产生的噪声）造成检测到的心跳次数不正确的结果，所以在程序中检测时间到达第5秒时，先对其进行计算，若结果超出正常范围则自动返回重新检测，直至结果正确，再继续检测5秒，最终由单片机计算出结果。在测量数据超过正常范围(如大于120次／min或小于45次／min)时自动重新开始检测。-Single-chip STC89C51 this design as the core, by the sound pulse sensor signal acquisition, the LM324 preamp circuit, filter circuit and compare the circuit to be associated with the pulse of the pulse signal, the pulse signal as the timer/counter interrupt signal cross-T1 single-chip pulse by calculating the cycle, T0 timer so.And then concludes that the pulse per minute pulse frequency (ie heart rate), and the results show 1602LCD heart rate. Pulse detected in the human body when debugging with the function of error. If misoperation (such as careless move noise) to detect the heartbeat caused by an incorrect number of results, so in the process of testing the time taken to reach the first five seconds, the first of its calculation,If the results exceed the normal range will automatically return to re-testing until the results of the right to continue testing for 5 seconds, the final results calculated by the single chip. In the measurement data over the normal range (for example, m Platform: |
Size: 1024 |
Author:郑雄 |
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Description: 基于C8051F330的正弦波、PWM、计数器、频率测试等功能实现-C8051F330 based on the sine wave, PWM, counter, frequency of testing functions Platform: |
Size: 40960 |
Author:linxiand |
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Description: This the counter program for counting the input frequency.-This is the counter program for counting the input frequency. Platform: |
Size: 1024 |
Author:siva |
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Description: 一个基于占空比1：1的10-400分频的计数器，很好用，可随意设置-A duty cycle of 1:1 10-400 points based on frequency counter, useful, free to set up Platform: |
Size: 5120 |
Author:买红亮 |
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Description: 这是一个用单片机做的频率计，外设需要配置一个同步门，之前可以实现精确的计频-This is a frequency counter to do with the microcontroller, peripherals need to configure a synchronization gate, before the meter can achieve accurate frequency Platform: |
Size: 36864 |
Author:cwd |
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Description: 不同频率的两个计数器，第一个计数器向上技术，第二个当第一个计满后向下计数-Two different frequency counter, a counter up the first technical, the second when the first after the expiration of a count down Platform: |
Size: 5120 |
Author:che |
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Description: 基于51单片机的频率计源程序
在keil3环境下编译
可以拓展为电容，电感和电阻的测量。-51 microcontroller based frequency counter source can be compiled under the keil3 expanded to capacitance, inductance and resistance measurements. Platform: |
Size: 1024 |
Author:梁世乐 |
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Description: 汇编语言的频率计，稳定准确 可以测量2M内的-Assembly language of the frequency, stability can be measured accurately within 2M Platform: |
Size: 748544 |
Author:郑先生 |
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Description: 基于单片机的频率计，可通过PROTUES软件仿真-Frequency meter based on single chip, software simulation can be PROTUES Platform: |
Size: 34816 |
Author:刘九 |
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