http://www.8051projects.net/ Learn to make simple microcontroller projects, pic, 8051, avr and arm projects. download 8051 projects, tutorials, libraries, sample codes. join the microcontroller discussion forum and ask doubts regarding electronics. the best source for 8051 over internet. Thu, 20 Nov 2008 18:59:38 -0800 http://backend.userland.com/rss092 hello everyone,i recently finished my first project (car based on 8052 uC with wired remote).now i want to make remote wireless and i am thinking abou <noauthor@nospam.com> http://www.8051projects.net/forum-t4286.html i want to use a nokia mobile phone (1100) !!! but dont know how to connect it with the circuit (receiver side) !!!i hav to put all the resistors, cap rahuljin<friend.rahul@nospam.com> http://www.8051projects.net/forum-t4286.html Please tell me what problem you are facing..the circuit given in that website is fairly simple. i recommend you to read datasheet of CM8870 will make Ajay<contact@nospam.com> http://www.8051projects.net/forum-t4286.html oww.. ok.. thats a good idea..yes you need all resistor caps and crystals..also you need to make circuit that detect ring and pick the call.. after th Ajay<contact@nospam.com> http://www.8051projects.net/forum-t4286.html so i ahv to open the mobile phone and do the circuit work ??? rahuljin<friend.rahul@nospam.com> http://www.8051projects.net/forum-t4286.html no.. make use of headset.. just use the speaker wire.. be smart Ajay<contact@nospam.com> http://www.8051projects.net/forum-t4286.html I think you are planning to interface your nokia phone with the microcontroller and control it by dtmf. you can use the CM8870 as your dtmf receiver. xx1mar<xx1mar@nospam.com> http://www.8051projects.net/forum-t4286.html there is no need to transmit DTMF as there nothing on the user side which can understand DTMF. and ofcourse CM8870 is the best choice for DTMF conve Ajay<contact@nospam.com> http://www.8051projects.net/forum-t4286.html hi can u tell me what is the relay dpot in that circuit and what is the use of that circuit ,and also how can i connect the whole circuit with the hea rahuljin<friend.rahul@nospam.com> http://www.8051projects.net/forum-t4286.html hello !!! any help rahuljin<friend.rahul@nospam.com> http://www.8051projects.net/forum-t4286.html sorry rahul.. i missed your thread, its not DPOT relay.. its DPDT (dual pole double throw) Relay. Its a type of relay. yes you need to take speaker of Ajay<contact@nospam.com> http://www.8051projects.net/forum-t4286.html thanks for the reply !!!i dont get the use of this DPDT reply !!!so what is the need of ring detector, i mean nokia has a option to accept the call au rahuljin<friend.rahul@nospam.com> http://www.8051projects.net/forum-t4286.html as perl the link you posted in your first post, that person uses telephone line not a mobile phone. so you can remove relay and directly connect the m Ajay<contact@nospam.com> http://www.8051projects.net/forum-t4286.html can u tell me the use of this relay ??? rahuljin<friend.rahul@nospam.com> http://www.8051projects.net/forum-t4286.html relay picks up the phone.. when ring is detected.. microcontroller switch on the relay and hence phone is answered. Ajay<contact@nospam.com> http://www.8051projects.net/forum-t4286.html so even without relay i hav to use ring detector circuit or not ??? rahuljin<friend.rahul@nospam.com> http://www.8051projects.net/forum-t4286.html Well usually there is facility in every mobile for auto answer, if you enable it.. then you need to decide how to detect if call is activated or not.. Ajay<contact@nospam.com> http://www.8051projects.net/forum-t4286.html i have done everything !!! but i am facing a problem.i sent the dtmf tone to other mobile then it is taken by cm8870 and output of cm8870 is obtained. rahuljin<friend.rahul@nospam.com> http://www.8051projects.net/forum-t4286.html You have to wait the end of the dtmf tone; check the stb pin.Something like this pseudocodeCODE:Sub St_dtmf
         if GioppY<gia.ma.fra@nospam.com> http://www.8051projects.net/forum-t4286.html in telephone line interface the input lines to DTMF is speaker lines or what? amer<engameer_2010@nospam.com> http://www.8051projects.net/forum-t4286.html sorry, but i used a mobile phone due to which the circuit not only becomes very simple but the application of this project is also increased. the spea rahuljin<friend.rahul@nospam.com> http://www.8051projects.net/forum-t4286.html please go through this linkhttp://onlinetps.com/raghu/ ۞ TPS ۞<tpsbpl@nospam.com> http://www.8051projects.net/forum-t4286.html