Taufeeq's Geek Pages
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All
electronic diagrams, articles, softwares including source code and concept
designs by
Taufeeq Elahi Diju are
licensed under a
Creative Commons Attribution-Noncommercial-Share Alike
3.0 Unported License. Based on a work at
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Please read the license before utilizing the material given in this document in your own work.
PAGE 2
Download the diagrams HERE
Download the source code HERE
Download the PIC compiler and uploader HERE
I assume that you have the three diagrams infront of you.
Now starting with the file "layout.jpg". it shows the side view of the hyperphone. there is the limit switch in it. when its not pressed, it will send a signal to the microcontroller that the two relays in the FIG 1 should be activated, thus bring a tone into your receiver. How the connections A,B,C,D, E are wired to the relays is clearly shown in FIG 1.
Hyperphone has two switches, means it can dial two fixed numbers that have been programed into it. So, if you want to call Mr.X you press switch 1, and if you want to call Mr.Y, you press switch 2. Both switches are attached to bi color square LEDs ( or backlights ), having yellow and red colors in the same package. Each bi color LED has three legs, one of them is common ground, and the other two are used to lit wither yellow color or red color.
Page1.jpg shows the over all circuit witch PIC 16f877A in the center. ICSP is used for live programming of PIC ( if you are not using ICSP for burning your PIC, you may forget these connections as they wont be required ). Many wires are labled as *1, *2, *3 etc... followed by the page number of figure number where that specific circuit is covered. Power supply design is also given on this page.
Page2.jpg covers the connections of the DTMF IC that is used to generate the tones. Pin 16 of this IC is its tone out. It goes to a 1:1 transformer. The two output wires of the 1:1 transformer are connected to the microphone terminals of the phone set. A relay is placed in series so that the 1:1 transformer is connected to the microphone only when dialing is required.
The code for this device is written in Proton Plus. Its commented, and easy to understand. Feel free if you have any problem in understanding the circuit/code, anytime.
Regards,
Taufeeq Elahi Diju
Project completed on 13 September 2009
Email : info(at)taufeeq.com
(Documented in Abbpttabad, Pakistan on 31st October 2009 )