Data acquisition device and method based on conversion of voltage values into time durations

Abstract

The invention discloses a data acquisition device and method based on the conversion of voltage values into time durations. A hardware circuit is composed of an integrated circuit chip LM324; the LM324 is provided with four operational amplifiers A1, A2, A3 and A4; the A1 is used to amplify input voltage signals; the A2, the A3, the C4, an R5, a switch K2, and an STC15F2K60S2 constitute a signal conversion circuit; the P3.2 pin of the STC15F2K60S2 is used as an external interrupt signal input pin; and the P1.0 pin of the STC15F2K60S2 controls the on-off of the switch K2. The circuit of the data acquisition device based on the conversion of voltage values into time durations is simple; the number of apparatuses used in the circuit of the data acquisition device is reduced; and therefore, the reliability and precision of the data acquisition device are improved, the error of the data acquisition device is reduced, the cost performance of the device is improved, and the cost of the deviceis reduced.

Description

technical field [0001] The invention belongs to the field of electronic measurement. The technical proposal relates to a conversion method of input voltage amplitude and output time value, and realizes conversion of input analog voltage value into time digital quantity. In particular, the data acquisition device that converts voltage into time is mainly used in the field of slow-changing data acquisition, especially in the safety equipment of hospital computer rooms. Background technique [0002] The data acquisition device is also called the measurement device, referred to as the device. The data acquisition device generally converts the measured physical quantity into an analog quantity, and then converts the analog quantity into a digital quantity, and then conducts human-computer interaction through the man-machine interface. The conversion method generally adopts successive comparison ADC, ∑-△ ADC or double integral ADC, etc. Now there are ADC resources in the internal...

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the existing problems of complex circuit structure, poor working reliability, inability to meet high-precision detection, and low cost performance, a data acquisition device for converting voltage values ​​into time lengths was invented. The thinking method of the device is as follows: figure 2 circuit and Figure 5 The software composition; in the circuit structure, the counter timer T / C of the microprocessor STC15F2K60S2 is used to replace figure 1 In the original circuit shown, the counter and gating G circuits composed of JK flip-flops simplify the circuit structure. At the same time, a new Figure 5 The software shown controls the working process of the circuit, and the circuit and software are used to convert the analog voltage value into a time digital quantity, which improves the working reliability and detection resolution, and improves the cost performance

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