Electronic scale for human health with temperature measurement

Abstract

An electronic human health scale with temperature measurement, including a weight measurement unit 1, a control and calculation unit 2, a display 3, a power supply 4 and a temperature measurement unit 5, the temperature measurement unit 5 sends the measured temperature signal to the control and calculation unit 2, Its main feature is that the software control program for obtaining the zero value stored in the control and calculation unit 2 operates as follows: A. The control and calculation unit 2 uses the temperature measurement unit 5 to track the peripheral environment temperature T at regular intervals; B. The method calculates the temperature change value ΔT, and compares the temperature change value ΔT with the temperature change allowable value Ts: if the temperature change value ΔT is less than the temperature change allowable value Ts, the zero point will not be updated; if the temperature change value ΔT is greater than or equal to the temperature change allowable value value Ts, then start and use the weight measuring unit 1 to re-measure the zero point value ZPO and update the storage. It has more complete functions, has the function of automatic weighing, saves power and has high measurement accuracy.

Description

1. Technical field: [0001] The invention relates to an electronic human health scale with temperature measurement. 2. Background technology: [0002] At present, electronic health scales on the market are generally powered by batteries. In order to prolong the service life of batteries, general electronic health scales automatically turn off all or part of the circuit power supply after each use to save power. Before each weighing, it is necessary to kick or step on the health scale to turn it on, and then wait for the health scale to return to zero before standing up and weighing, which is inconvenient to use. In order to solve the problem, the applicant of this case applied for an invention patent named "Electronic Human Health Scale" on September 27, 2000, the patent number is: 001174908, and the announcement number is CN1117268C. Its principle is: every other The zero point value is measured and updated according to the time. Once the person gets on the scale and closes...

AI Technical Summary

Problems solved by technology

But there are deficiencies in this technical solution: 1) when the time for measuring and updating the zero point value is short, the accuracy of weighing will be improved, but due to the frequent start of analog circuits such as pressure sensors, amplifiers and A / D converters Partial work consumes a lot of power, which greatly shortens the service life of the battery; 2) When the time for measuring and updating the zero point value is long, it can save power and prolong the service life of the battery, but the chance of being affected by external factors increases, making the scale The accuracy of the measurement will be reduced. For example, measure the zero point every half an hour. Then, before weighing in the room, the temperature may be 30 degrees and measure the zero point once. After turning on the air conditioner, the temperature will drop to 23 degrees within half an hour. At this time, the weight of the human body weighed out is quite different, because the influence of temperature on the measurement accuracy of electronic measuring components is the most sensitive and important factor, and the zero point drift is easy to occur

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