ʱ : (强烈推荐)智能无线安防报警器设计毕业论?- 百度文库ϿʼĶ
Ƶģԭͼ
2.4 ߽ģ 2.4.1 ·ԭͼ
DINΪźˣVTΪЧȷˡPT2272ɵĽܵ
·ΪַͬƥԱ֤PT2262A0-A7 8λַգͼе·ѾѡƵ硢Ŵεĵ·źŽܶ˲14ߵѡƵãƾϽʱԼȥ
Ƶģԭͼ 2.5 DTMFշ· 2.5.1 DTMFշźŵĵ·
ƬͨDTMFշ·绰е绰DTMF·źŶᾭźŷŴ·(TEA1062Ϊ)õƬP2ɶMT8880оƬĿƣƬP2.0-P2.3MT8880D3-D0ͨʵжMT8880ģʽƣƬP2.6P2.4MT8880ĺRS0ܶMT8880мĴѡͲMT8880TONE˿ΪDTMFͶˣDTMFźţMT8880ͨDTMF룬TEA1062ŴLNһ͵绰ϡ
DTMFշźŵ·ԭͼ
2.6 · 2.6.1 ·
õоƬISD1420Ƚģ洢ʺãADת¼20Ϣɷֶδ洢Ϣ뵥Ƭӿڡ㹦Ϣ洢ʽϵ£Ϣɱ10ϣʹãı¼ݣ¼Ŵ10ϡڱУûͨ绰
ûĵַ110ֶ¼뵽ISD1420СʹISD1400ϵеоƬʱӦעRECVCC֮һ0.1mFĵݣԷֹϵʱ¼ƻԭ¼ƵϢ˿ڹΪƽƬP1.4ڽӿоƬSP+˿ΪȽӿڼӵ绰רͨɵ·TEA1062MIC˿ڡܻʱźͨ磬TEA1062оƬIR룬ŴQR͵ISD1420ANA-IN˹¼á
·ԭͼ
2.7 ⼰Զժһ·ͼ 2.7.1 ·
Ϊֹ绰·ϻΪ²ܵ绰Ϊһֲȴʩ
ϵͳм˶··һź9018ɵĸ迹·ƽʱ绰ߵ·ѹԼһ֡˵·Ӧ绰Ҫ֤й¶15mA¡һɹ4N33 ɣߵѹ͵4N33Bˣ绰ʱͻȻϣCΪߵƽʱƬɵ绰ʽԶתΪűʽ˫رĿġ
·ͼ
2.7.2 Զժһ·ͼ
ԶժԶժյ绰ǰᡣص绰жϵ绰·Ƿժĸǻ·ͻȻ30AΪ绰ѾժбźŻе绰룬Ҫϵͳժͨ绰ʱƬP1.5ڱߵƽʹNPN5551̶ͨ5041ͨӶ绰·ͨʵԶժP1.5ڱ͵ƽʱϵͳʵֹһ
·е绰ʱϵͳжĴﵽԤĴ绰ûժϵͳԶժ绰źͨ뵽AT89C51T0ţмӵźʱ峬ûûժԶתCPUP1.5álʵԶժܡ⼸У˽ͨ˵绰Ӧʹÿ绰š
绰ģժ·ͼ
ʵ
3.1
ֳòѯʽϵͳʼжúX5045洢ֵȡͼͼʾ
ͼ
MAIN MOV SP#60H
SETB P1.0 Դָʾ
JB P0.3$ 绰·ϣȴ FUND JNB P1.7$ ź LCALL DL1S
JNB P1.7FUND ȷź
LCALL DIAL Զӳ WARNGSTEB P1.1 ָʾ STEB P1.3 LCALL DL30S JB P1.7WARNG CLR P1.1 CLR P1.3 AJMP MAIN 3.2 ģ˵ͼ
жϺǷЧʱҪԵ绰źŽб𣬵绰ź3ָʽ æ450Hz350msС350msޣ 450Hzź 450Hz1sС4s
жϷʽDzõƬT05sֵ10410411H-121204BCHΧʱΪæֵ42501A9H-47501DBHΧʱΪ
ӳͼ
ӳ
DAIL STEB P1.5 ժ
MOV A#0C6H źдƼĴCRA MOV P2A
MOV A#0C6H MT8880ģʽ MOV P2A
MOV DPTR#0FECH õ绰ַʼֵ