Control circuit and method for controlling Nixie tubes through single-chip microcomputer

Abstract

The invention provides a control circuit and method for controlling Nixie tubes through a single-chip microcomputer, and the circuit comprises a single-chip microcomputer, a DC power source, and a plurality of Nixie tubes. The cathodes of light-emitting diodes, used for displaying the same stroke, of the Nixie tubes are connected, and then are respectively connected to different I / O ports of the single-chip microcomputer. The circuit also comprises three triodes, and the base electrodes of the triodes are respectively connected to different I / O ports of the single-chip microcomputer. Accordingto the invention, the single-chip microcomputer is used for alternately controlling the connection of the triodes, thereby enabling the common electrodes of the corresponding Nixie tubes to be connected to the DC power source. Moreover, the single-chip microcomputer is used for controlling the turning-on of the corresponding light-emitting diodes on the Nixie tubes, and enabling the Nixie tubes to display the corresponding numbers. The circuit provided by the invention does not need a dedicated LED drive chip, employs a smaller number of electric elements, is simple in structure, occupies fewer I / O ports of the single-chip microcomputer, and is low in production cost.

Description

technical field [0001] The invention relates to the field of electronic technology, in particular to a control circuit and method for a digital tube driven by a single-chip microcomputer. Background technique [0002] The digital tube is composed of 7 light-emitting diodes, which are arranged in a "8" shape, and the corresponding numbers 0-9 are displayed by connecting the corresponding light-emitting diodes. We named these LEDs "a, b, c, d, e, f, g" respectively. Nixie tubes are divided into common anode digital tubes and common cathode digital tubes according to the connection mode of the electrodes of each light-emitting diode. A common cathode digital tube refers to a digital tube that connects the cathodes of all light-emitting diodes together to form a common cathode. When the common cathode digital tube is applied, the common pole should be connected to the ground wire. When the anode of the light-emitting diode in a certain field is at high level, the corresponding...

AI Technical Summary

Problems solved by technology

At present, the digital tube display is generally directly driven by a fixed IO port through a built-in single-chip microcomputer driven by an LED light, but the cost of this kind of single-chip microcomputer driven by a built-in LED light is high and requires a large number of I / O ports; It is used for chip communication driven by LED lights to scan and drive digital tubes, but the communication procedure of this method is complicated, and the external driver chip will also make the circuit complicated and increase the processing cost

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