chao ban minh vua doc xong bai cua ban ve led ma tran va minh cung dang lam bai tap ve hien thi led ma tran giao tiep voi may tinh qua rs232 dung pic. nen minh muon dc trao doi ve van de nay voi ban hj. minh cung co 1 bai hien thi led nhung chua co truyen thong. minh cung chi moi hoc mon nay nen con ga lam mong ban chi giao