... th, ú l i vi Ma trn Led Nhng ti Bng qung cỏo bng Led n ny thỡ ch gm chớnh, ú l: Khi iu khin(dựng 89C51),B m v Khi hin th(mch ốn Led n) Khi iu khin (89c51) B m Khi hin th ( Led n) 2.1.2 S b trớ ... ny l tng dũng lờn mnh cho cỏc Led mc song song hot ng tt (vỡ cỏc Led bng ốn c mc song song lờn hiu in th U cho hot ng nh U=5V, cũn dũng thỡ c tng lờn theo tng Led mc song song vo mch ú). hin ... theo chu kỡ c lp trỡnh sn thc hin c iu ny, ngi ta cú th s dng nhiu cỏch nh dựng bng ốn Led Ma trn, bng ốn Led nNhn bit c ú, chỳng Em, Sinh viờn chuyờn nghnh in -in T ,trng Cao ng Cng ng Hi Phũng,di...