LCD1602 temperature display program design process

In the display of temperature, LCD1602 is used, which can display two lines of characters, 16 characters per line, and the display capacity is 162. Through the parallel interface, it can be directly connected to the I/O port of the microcontroller.

The pins and functions of 1602 are as follows:

VSS: power ground

VDD: positive power supply, connected to +5V power supply

VL: LCD bias signal

RS: Data/instruction register selection terminal. When the level is high, the data register is selected; when the level is low, the instruction register is selected.

R/W: Read/write selection terminal. When the level is high, it is a read operation, and when the level is low, it is a write operation.

E(6): Enable signal, falling edge triggered

D0-D7: I/O port data transmission line

BLA: Backlight positive electrode

BLK: Backlight negative electrode

When the RS and R/W pin signals are 1 and the E pin changes from 1 to 0, the data is read; when the RS pin signal is 1, the R/W pin signal is 0, and the E pin changes from 1 to 0, the data is stored. Therefore, the reading and storage of data can be controlled by setting the high and low levels of RS and R/W.

Its specific command operations include clearing the screen, carriage return, input mode control, display switch control, position control, and display mode control, as shown in the table.

In this system, the LCD is initialized first, the AD converted value is sent to the LCD, the LCD reads the data, then writes the function, and finally displays the collected temperature value on the LCD1602 screen. The flow chart is shown in the figure.