LED Display Electronic Voltmeter

Task description: Use 89C51 microcontroller to implement the following functions: The initial state is that the digital tube displays 2020 and the four lights are off. 1. The circuit has four control buttons, four lights, and four digital tubes; 2. Press button 1, and the first digital tube will increase from 0 to 9,

This design idea shows a new method to drive six LEDs using only two MCU I/O lines. This method is especially suitable for any chip with limited pins. This method uses two I/O lines and a pair of complementary bipolar transistors . More than one LED can be lit by multiplexing. A previous design example (Reference

1. Environmental requirements Install proteus (for microcontroller simulation) Install keli (used to generate the HEX file required by the microcontroller) 2. Proteus renderings As shown in the figure, the AT89C51 chip is used here to light up the LEDs on the chip P0.0, P0.1, P1.0, and P1.1 respectively. Since, ex

  As a new generation of light source, LED has a series of characteristics such as low voltage, low power consumption, small size, fast response, no pollution, high reliability and long life. Because there is no ultraviolet and infrared in the spectrum it produces, there is no heat and thermal radiation, and it can r

To design LED lighting products, we must first determine which LED packaging structure to use; then consider how to adapt to these packaging forms; we have few choices, and the optical structure is built on these packages; many of our creative ideas cannot be fully utilized. 　　1. Problems in semiconductor lighting app

　　After 150 years of development, the lighting industry It has since evolved into a mass production industry based on standardized light bulbs. The design of light bulbs is inherently obsolete. consumer Find yourself using the same new product frequently products to replace short-lived products in use. 　　This tren

　　High-power LEDs have higher luminous efficiency and service life than fluorescent lamps. People should install a heat sink according to the actual use. At present, the retail price of domestic 3W white light LED is 15 yuan, but because the quality of 3W high-power LED is not reliable enough, it is not suitable for u

　　Today, many portable electronic products require backlight LED driver solutions that have the following features: DC control, high efficiency, PWM dimming, overvoltage protection, load disconnection, small size, and ease of use. This article will explore the characteristics of each LED driver and how to achieve