Today, once again hate, before Xiaobian has said that this electronic clock for small friends who like to drums MCU, can also be used as a development board of STC microcontroller, Xiaobian today released the high-definition circuit schematic of this board, As shown below, you are not clear, it is because of the problem of network compression, the text tells you which to take the HD version of the map.
Next, Xiaobian began to explain this circuit diagram briefly.
Master MCU
Chip: STC15F204EA-DIP28
Performance: 5V 1T single-chip microcomputer, 6-12 times larger than traditional single-chip microcomputer, working frequency 5-35MHZ; 4K program storage flash, SRAM 256 bytes, 1KEEPROM; 2 timers, 8 10-bit ADC converter; internal watchdog High-precision internal RC clock; 26 general-purpose IO ports, which can work in 4 modes.
Clock chip
The clock chip is DS1302, externally connected with 32.768KHZ crystal oscillator, matched with 22Pf capacitor, accurate and stable when traveling; with backup battery, the power-off time is accurate.
1 inch large digital tube display
The display is displayed with a 1-inch large highlight digital tube with a visible distance greater than 10 meters. The driving method adopts a simple and practical 8550 triode common anode drive. The digital pipe segment is connected to the P2 port of the single-chip microcomputer, and the bit is selected to be connected to the P3.4-P3.7 port. The use of a photoresistor to collect ambient illuminance for brightness adjustment enables stepless dimming.
input device
Due to the size of the board (the size determines how much money is spent), only two input buttons are designed, one for the function button and one for the plus button. The button interface and the program download interface share the P3.0 and P3.1 pins.
Temperature acquisition and sounding components
There is also a thermistor on the circuit board, which can read the resistance value of the thermistor through the ADC module of the single chip microcomputer, and finally convert it to the current temperature to realize the function of the thermometer. Finally, a buzzer is added to make an hourly alarm, an alarm bell, and a button tone.
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