Direct reading gauge
A direct-reading meter and excitation device technology, applied in the field of direct-reading meters, can solve the problems of infrared light being easily affected by light, ambient humidity, complex circuit design, unreliable reading, etc., and achieve low cost, simple circuit and accurate reading. Effect
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[0013] The technical solution of the present invention will be further described in detail below in conjunction with the accompanying drawings.
[0014] As attached figure 1 Shown: A direct-reading meter includes a characters wheel, excitation device A (position is fixed), and a stainless steel plate B embedded in the center of the character wheel (rotating synchronously with the character wheel).
[0015] As attached figure 2 Shown: the excitation device is composed of an LC oscillator circuit.
[0016] In normal work, set the select signal (SELECT) to low, and at the same time give an excitation to the excitation signal (TRIGGER) to cause LC resonance. Because the shape of the stainless steel sheet is an asymptotic shape, when the character wheel changes from 0 to the position When turning to the 9 position, the distance between the excitation device and the steel sheet is getting closer and closer. When the steel plate of the character wheel is far away from the excitation devic...
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