---- __----- - | RST VCC |- Power function keys to set the timer time- | P3.0 P1.7 |-24C02 serial IIC data line SDA to set the timer plus key- | P3.1 P1.6 |-24C02 serial IIC clock line SDA - | XTAL P1.5 |-74LS164 clock line CLK - | XTAL P1.4 |-74LS164 data line AB set the timer by key- | P3.2 P1.3 |-LED 1000-driven motor stop button _ | P3.3 P1.2 |-LED 100 driven motor run button- | P3.4 P1.1 |-LED digit driven fan control port- | P3.5 P1.0 |-LED 10 driven power ground- | GND P3.7 |- Powder Sieve Motor Control

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