ʾ Ƶ ʺŰ ѹ ڣ | ر

ʾ Ƶ ʺŰ ѹ ڣ | ر
Ƭ LCD
LED DZȽϼ Ҳ ģ λ һ LED е ʽ ÿ ʹ һ ˣ Ķ Ӧ ʶ ʹ һ ƶˣ ʱɨ û λ ʾ LED ȽϷѵ磬 һ õ ع ӣ ؾͳŲ ˡ ҿ Һ ߵĵ г һ 4λ ʶ ʽҺ 4 м ð ţ ϻ м ͷ ţ һ 15 ţ AVR һ ӡ ʶ ʽLCD Ľṹ LED ƣ Һ ϲ ʽҲ к 죺 (1) LED Һ'ûС (2) LED ѹ Һ Ҫ ѹ ЧӦ (3) LED Ҫ ṩ Һ ʻ ʾ µ dz (4) LED СӦҺС ѿ LED ʽ Դ LCD в ġ ǰû ʶ ٵ LED Ҫ ÿ ʻ һ ѹ һ 30-60Hz ķ ˣ Ƶ ٵ ʾ Ƶ ʸ Ҳ ӣ ΪLCD Ե ԡ ң ѹ ԡҺ AVR I/O ڿ Ҳ dz / ƽ Գ 迹 ڶϿ ӡ 뵽 İ취 Ҫ ʾ һ ʻ Ӧ Ĺ (I/O ѡ ) ô Ͳ ϵ ѹ ˡ ҵ ʵ ã ʾȴ һ 㣺 ʻ 塣 ſ ǵ Һ 迹 ߣ е ݣ Dz һ յģ Ҳ CMOS һЩ Һ ϣ LCD ô ģ ' 1 / N, Ҳ ǵ ѹ ߵ ǵ Ƭ I/Oû ô ѡ 1/2 Bias ʾ Һ ʻ ѹ ȣ ʾ IJ ȡ һ Ҫ ɨ 跽ʽ 㣬 ǸΪѹȼ 1 / 2 Biasģ COM1 V + - - ---- 1/2 ---- ---- ---- ---- ---- ---- GND COM2 V + ---- ---- --- 1/2 - ---- ---- ---- ---- ---- GND SEG1 V + -------- -------- 1/2 GND ------ - -------- SEG2 V + ---- -------- ---- -------- which washing machine -------- 1/2 GND ˣ COM1, SEG1 ѡı'ϣεĵѹΪ -1/2, -1, +1/2, 1 ... COM1, SEG2 ѡı' ϣεĵѹΪ +1/2, -1, -1 / 2, 1 ... COM2, SEG1 ѡı'ϣεĵѹΪ -1, -1 / 2, 1, +1/2 ... COM2, SEG2 ѡı'ϣεĵѹΪ 0, -1/2, 0, +1/2 ... һ µ ƽ ( Һ Ҷ ѹƽ ȣ ʵ ʲ )ǰ һ ģ 1+ (1/2) ^ 2 = 5/4, һ 0+ (1/2) ^ 2 = 1/4'ĹʱΪ 5: 1,'" SEG1 SEG2:: which washing machine COM1 - - - O - - - O:: COM2 - - - O - - - x AVR I / OU 1/2 Vcc ĵѹ (ADCͲҪ, I / Oþ Һ ), ûа 취 ʵ 1.2 Bias ע Ҫ ṩһ һ Դ ѹҲ ȻAVR I/O ڿ ѹ ڡ 1/2 Vccˣǣ1 / 2 Bias Vcc | & nbs