There are many types of LCDs. According to the display mode, they can be divided into segment type, line dot matrix type and full dot matrix type. The segment type is similar to the digital tube. The line dot matrix type is generally English characters, and the full dot matrix type can display any information, such as Chinese characters, graphics, charts, etc. Here we introduce an eight-segment four-digit LCD display. The display has a built-in driver and serial data transmission, which is very convenient to use. The schematic diagram is as follows:
The figure below is a simplified diagram of the external leads of the 4-digit LCD display module SMS0403 with a serial interface produced by Changsha Sunman Technology Development Co., Ltd.
For the specific parameters of the module, please check the company's website. The temperature sensor used in this example is a single-bus digital temperature sensor produced by DALLAS, an American company. This sensor has detailed information available for download on this site. This example can be made into a thermostat with a slight modification.
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