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µÚÈýÕ ³µÔØÖն˵ÄÓ²¼þϵͳÉè¼Æ

ͼ3-4 GSMÄ£¿éÖ÷µç· Fig 3-4 The main circuit of GSM module

2.SIM¿¨µç·

SIM¿¨µç·ÊÇGSMÄ£¿éµÄÒ»¸öÖØÒªµç·£¬Ö»ÓÐ×°ÈëÁËSIM¿¨£¬GSMͨÐÅÄ£¿é²ÅÄܽøÐÐÕý³£µÄÊý¾ÝͨÐÅ£¬ÔÚ±¾¿ÎÌâÖвÉÓÃÁË6¸öÒý½ÅµÄSIM¿¨×ù£¬ÆäÒý½Åͼ[40]Èçͼ3-5Ëùʾ£º

ͼ3-5 SIM¿¨Òý½Åͼ Fig 3-5 The pin figure of SIM card

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SIM¿¨×ùµÄÒý½Å˵Ã÷Èç±í3-3Ëùʾ£º

±í3-3 SIM¿¨×ùÒý½Å˵Ã÷ Table 3-3 The pin description of SIM card Òý½ÅºÅ 1 2 3 4 5 6 Ãû³Æ VCC RESET CLK GND VPP IO ˵Ã÷ SIM¿¨¹©µçÒý½Å SIM¿¨¸´Î»Òý½Å SIM¿¨Ê±ÖÓÒý½Å SIM¿¨µØÒý½Å SIM¿¨±à³Ì¹©µçÒý½Å SIM¿¨Êý¾ÝÊäÈëÊä³öÒý½Å SIM¿¨µç·Èçͼ3-6Ëùʾ£º

ͼ3-6 SIM¿¨µç·ԭÀíͼ

Fig 3-6 The principle figure of SIM card¡¯s circuit

ͼ3-7 GSMÄ£¿éÆô¶¯µç·ԭÀíͼ

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Fig 3-7 The principle figure of GSM module¡¯s starting circuit

3.GSMÄ£¿éÆô¶¯µç·

ÔÚ±¾¿ÎÌâÖУ¬SIM300Ä£¿éÓÐÁ½ÖÖÆô¶¯·½Ê½£º £¨1£©°´¼ü¿ØÖÆÆô¶¯£» £¨2£©I/O¿Ú¿ØÖÆÆô¶¯¡£

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4.SIM300ÍøÂç״ָ̬ʾµç·

SIM300Ä£¿éͨ¹ýÒý½Å30£¨Network-LED£©¿ØÖÆÒ»¸öָʾµÆ£¬µ±GSMÍøÂçÁ¬½Ó³É¹¦ºó£¬Ö¸Ê¾µÆÁÁ¡£ÍøÂçָʾµç·µÄÔ­ÀíͼÈçͼ3-8Ëùʾ£º

ͼ3-8 GSMÍøÂçָʾµç·ԭÀíͼ

Fig 3-8 The Principle of GSM¡¯s network indicating circuit

3.4 CANͨÐÅÄ£¿éÉè¼Æ

ͼ3-9 CANͨÐŵç·ԭÀíͼ

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Fig 3-9 The principle figure of CAN communicating circuit

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3.5 LCDÒº¾§ÏÔʾģ¿éÉè¼Æ

ͼ3-10 Òº¾§Ä£¿éÓ뵥Ƭ»úÁ¬½Óµç·

Fig 3-10 The junction circuit between LCD module and MCU

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