In order to simplify the driving circuit of the L ED display, the port resources of the MCU are saved, and the common L ED display driving circuit is improved. All the common serial-in parallel-out shift registers are used as the strobe drive, and all the systems are serial. Data control forms a L ED display driver circuit solution with only 4 signal lines. It only needs to occupy 4 I/O ports of the MCU to send serial data to realize the normal display function. Program code. 1 Introduction The L ED display is widely used and is an effective tool for information dissemination. The ARM S3C44B0X 32-bit MCU is selected as the CPU in a mine mining equipment monitoring system. According to the application requirements, the display part of the monitoring system displays the monitoring data in real time using a 16-line monochrome L ED display. Due to the large number of system peripherals and the tight port resources, a four-wire driver display circuit design scheme was developed for this situation, which solved this problem well. 2, common drive circuit design and improvement In the common display driver circuit design, the column control generally uses a serial-in-loaded latch register such as the 74HC595 to drive data into the latch, so that each pin of the register assumes the same state as the latch. The column that needs to be lit. The row control generally uses a decoder circuit such as a 4/16 decoder 74HC154, and the control signal is decoded to select a row to be lit. This hardware structure design requires more control signal lines, consuming more ports of the microcontroller and causing waste of port resources. In the improved L ED display driver circuit design scheme, the row and column control adopts a shift register with a serial input and a latch, and the generation of the control signal is realized by the serial data of the S3C44B0X I/O port. This only requires 4 signal lines L ED display to work properly. 3, display drive circuit design 3. 1 circuit structure The LED display consists of multiple LED dot matrix modules. The display circuit adopts 1/16 scanning mode, and one line of the display matrix corresponds to one line strobe signal, and the same column of each line shares one column strobe signal. When it is necessary to display the graphic content on the L ED display, as long as the corresponding light-emitting device on the display is illuminated under the control of the row and column display data, one row is lit at a time, and each row is sequentially illuminated as long as the speed is sufficient. It will produce a continuous visual experience. EO2 is an Ethernet extender over UTP cable. One EO2 at the network end can support one or multi remote models and their connected IP network devices. This EO2 can transmit over telephone line, Ethernet cable, and twisted pair. It is provided with excellent lightning protection and anti-interference capacity. In the real work environment, the network bandwidth could reach up to 60Mbps. With the Ethernet extended to 750meter, it has enlarged the Ethernet network application area, cutting down the project cost by using Cat5e or Cat6 cable. Ethernet And Power Over UTP Cable Converter Ethernet And Power Over UTP Cable Converter,Power Over Ethernet,UTP Cable Converter,POE over UTP Cable Extender Shenzhen N-net Technology Co.,Ltd , http://www.nnetswitch.com
N-net EO2 series have POE function, powering remote EO2 transceivers and their connected IP network device, default as a master terminal.
September 07, 2019