Introduction - If you have any usage issues, please Google them yourself
First, functional realization
(A) LCD display
1. Start the animation
A graphic moves down until it disappears.
2. Welcome screen
Print out Welcome to the temperature sensor production: Liu Yucheng words.
3. Use the interface
(1) Current temperature, upper temperature limit, lower temperature limit display.
(2) the upper limit alarm level, lower limit alarm level display.
(3) fan stalls display.
(4) sensor working time display.
(B) set the upper and lower limits
Matrix keyboard 0-9 set 3-bit upper and lower limits, the default upper limit of 100 ℃, the lower limit of 25 ℃.
(C) overrun alarm
When the temperature exceeds the upper and lower limits, the LED flashes. The flashing frequency is adjusted by the button. It is divided into 6 files. The default upper limit is 5 files and the lower limit is 1 file.
(D) temperature control
1. Ultra-low limit: resistance wire heating, return to normal temperature resistance wire quickly restore normal temperature.
2. When the uppe