Analogue timer and setting and operating methods thereof

Abstract

The invention discloses an analogue timer, and a setting method and an operating method thereof. The analogue timer comprises a singlechip microcomputer controller, at least one variable resistor, a memory cell and at least one output unit. The setting method comprises the following steps of: obtaining and storing an oscillation frequency ratio or a cycle ratio; changing a resistance value of the variable resistor; measuring and storing a corresponding voltage value; and repeating the changing resistance value step of the variable resistor and measuring and saving the corresponding voltage values step. The operating method comprises the following steps of: changing the resistance value of the variable resistor; measuring the corresponding voltage value, and calculating the resistance value of the variable resistor by utilizing a stored corresponding voltage value; calculating a time scale by utilizing the resistance value; calculating a numerical value of a counter according to the time scale and the stored oscillation frequency ratio of cycle ratio, and performing timing according to the numerical value; and outputting a timing finishing signal.

Description

technical field [0001] The present invention relates to an analog timer and its setting and operation methods, in particular to a single-chip microcomputer controller instead of a resistor-capacitor oscillator and divider to achieve an analog timer with simple setting, easy quantitative production and accurate timing. Type timer and its setting and operation method. Background technique [0002] see figure 1 As shown, the commonly used analog timer 4 includes an oscillator 40, a divider 41 and an output drive unit 42, the oscillator 40 includes a capacitor 400, a variable resistor 401, the analog timer 4 The oscillation frequency of the oscillator 40 is changed by changing the resistance value of the variable resistor 401 , thereby generating different timing cycles. [0003] Wherein the time constant formed by the capacitor 400 and the variable resistor 401 determines the oscillation frequency of the oscillator 40, after the divider 41, when the counter of the divider 41 ...

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Problems solved by technology

Therefore, the production process has the disadvantage of being slow and time-consuming

In addition, if the linearity of the variable resistor 401 is not good, accurate timing can be obtained at full scale, but at other time scales, it is easy to generate a large error, so it is not suitable for commonly used analog timing. For the variable resistor 401 of the device 4, the quality requirements of its linearity are relatively strict, so that accurate timing results can be obtained at all time scales

[0007] In addition, if there are many types of commonly used analog timers 4, the prior art usually produces a batch of circuit boards without variable resistors 401 and capacitors 400, and solders the appropriate variable resistors until the order is received. 401 and capacitor 400, thus wasting a lot of time, resulting in disadvantages such as high cost and low production flexibility

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