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<H1 align=center>DTMF Decoder 2 by <A 
href="http://www.infidigm.net/">Infidigm</A></H1>
<P align=center><IMG height=319 
src="DTMF Decoder 2 by Infidigm.files/dtmf2all.jpg" width=500></P>
<HR>
<BR>
<P><A href="http://www.infidigm.net/projects/dtmf/">Rev 1</A></P>
<H2>Disclaimer</H2>
<P>This device and all information contained on this website is for educational 
purposes only. This device must be used in conjunction with any and all local, 
provincial and federal laws. It is up to the end user to comply with all legal 
guidelines, thus we are not and will not be held responsible for any misuse of 
this product or any damages that it may cause.</P>
<H2>Description</H2>
<P>The DTMF decoder 2 is a useful tool used for decoding DTMF (Dual Tone Multi 
frequency) generated by telephones. The decoded digits are viewed on a 16x2 LCD 
screen. The DTMF decoder can be directly connected to a Serial port to view the 
digits in HyperTerminal on a computer. The decoder stores the last 234 received 
digits in EEPROM. The contents of EEPROM can be viewed on the LCD screen via two 
scroll buttons. Total power consumption is 12mA. The DTMF decoder has two 
inputs. A RJ11 jack for connecting to the phone line and a 1/8" audio jack for 
connecting to a scanner, tape recorder or other audio output device.</P>
<H3>Changes made in Rev 2</H3>
<P>
<UL>
  <LI>Connects directly to PC without an interface. 
  <LI>Displays the line number (1 - 19) when scrolling. 
  <LI>Has software filtering for button contact de-bounce. 
  <LI>Properly displays '#' and '*' digits. 
  <LI>Improved power consumption from 21.7mA to now only 12mA ! 
  <LI>Program written in C. 
  <LI>Useless Microphone circuit removed. </LI></UL>
<P></P>
<H2>Assembly</H2>
<P><A href="http://www.infidigm.net/projects/dtmf2/dtmf2b.jpg"><IMG height=141 
src="DTMF Decoder 2 by Infidigm.files/dtmf2b-s.jpg" width=231 align=right></A> 
The DTMF Decoder 2 can be assembly by anyone with general electronic knowledge 
and soldering skills.</P>
<P>A <A href="http://www.infidigm.net/projects/dtmf2/dtmf2pcb.pdf">PCB 
layout</A> is provided if one wishes to construct their own PCB. Simply print 
the file at 1:1 onto an overhead transparency. (Get the correct sheet for your 
type of printer) I used a kit by MG Chemicals (<A 
href="http://www.e-sonic.com/">E-Sonic</A> Search for 416-K) to produce my PCB. 
The provided PCB layout's smallest traces are 15 thou wide. Drill the holes for 
the headers at 40 thou. Drill the holes for the 20K POT, the buttons, and the 
audio jack at 35 thou. Drill the rest of the holes at 30 thou. Drill bits can be 
found a most hobby stores.</P>
<P>Review the <A 
href="http://www.infidigm.net/projects/dtmf2/dtmf2sch.jpg">schematic</A> and <A 
href="http://www.infidigm.net/projects/dtmf2/dtmf2pp.jpg">parts placement 
diagram</A> before beginning assembly for proper orientation of ICs and 
capacitors. Begin by installing the 7 jumper wires. Next solder in all the 
resistors and capacitors. Then solder in the buttons, the phone and audio jack, 
the 20K POT and the crystal. Solder in the 20 pin socket, ICs and 9v battery 
connector. Next solder the DB-9 connector to the end of the PCB. Short pins 7 
and 8 on the DB-9 together by bridging them with solder. At this point, connect 
power and test the decoder for +5V between pins 10 and 20 on the 20 pin socket. 
Finally install the two, seven pin headers into the LCD <A 
href="http://www.infidigm.net/projects/dtmf2/dtmf2sd.jpg">(short side towards 
LCD)</A>. Solder the longer side of the headers into the DTMF decoder PCB. 
Attach the LCD and decoder together with hot glue or other means.</P>
<P>Feel free to email me with questions / problems at "drwho <I>at</I> infidigm 
<I>dot</I> net". I may not respond to all questions.</P>
<H2>Programming</H2>
<P>Programming the microcontroller is the next step. The micro is a <A 
href="http://www.atmel.com/atmel/products/prod23.htm">AVR AT90S2313</A> made by 
ATMEL. An AVR socket programmer is required. Here is a list of programmers.</P>
<UL>
  <LI><A href="http://www.digikey.com/">STK500 Development board</A> (Search for 
  STK500) . 
  <LI><A href="http://www.didya.com/ultimate.asp">Ultimate Atmel Programmer</A> 
  <LI><A href="http://www.lancos.com/e2p/avrisp-stk200.gif">Make you own AVR 
  Socket Programmer.</A> Replace D1 with a 1N5817 and use a 20-pin DIP 0.3" 
  socket instead of the 10 pin connector. You will have to connect a crystal 
  between pins 4,5 and supply power. </LI></UL>Plug the 2313 micro into the socket 
programmer . Write the program <A 
href="http://www.infidigm.net/projects/dtmf2/dtmf2.hex">dtmf2.hex</A> to the 
micro. Instructions are provided with the specific programmer. If you make your 
own Socket programmer, use <A href="http://www.lancos.com/prog.html">Pony 
Prog</A> which is free Programming software. Install the micro into the DTMF 
decoder. Power the decoder up, adjust the contrast, and the message "DTMF 
Decoder by www.infidigm.net" should appear on the screen. 
<P>NOTE - Rev 1 and rev 2 software are interchangeable in both rev 1 and rev 2 
of the decoder.</P>
<H2>The Program</H2>
<P><B>Only read this section if you wish to modify the program!</B></P>The 
program is written in C. It consists of one C file and was written to be 
complied under the free AVR-GCC C compiler <A 
href="http://www.avrfreaks.net/AVRGCC/">(WinAVR 3.3 April. 04, 2004)</A>. Read 
the beginners guide to learn how to install GCC. Once you have GCC working, 
download the <A href="http://www.infidigm.net/projects/dtmf2/dtmf2.zip">Project 
Files for Programmers NotePad.</A> and unzip them to a directory of your 
choosing. Run Programmers NotePad ( /WinAVR/pn/pn.exe). In PN go "File--&gt;Open 
Project(s)" and select "dtmf2.pnproj" in the directory where you unzipped 
"dtmf2.zip". Open "dtmf2.c by double clicking on it. Click "Tools--&gt;Make All" 
to test the Compiler. The program is well documented and self explanatory.
<P></P>
<H2>Usage</H2>
<P>To use the DTMF decoder, simply connect it to a 9V battery and the phone 
line. The DTMF decoder will accept ISOLATED DC voltages from 7 to 20 V for 
power. Upon power up the Message "DTMF decoder by www.infidigm.net" appears on 
the LCD screen. The message will remain there until a DTMF digit is received or 
a scroll button is pressed. If a DTMF digit is received while scrolling through 
EEPROM, the LCD screen is restored and the digit is appended to the end of the 
line. The LCD will auto scroll at the end of each line. Their are two scroll 
buttons, UP and DOWN. They will shift the last 234 digits through the LCD screen 
13 at a time. UP will move towards the oldest received digit while DOWN will 
move towards the most recently received digit. Remember to set the 20K pot for 
LCD CONTRAST adjustment.</P>
<P>To connect the DTMF Decoder to the computer use a 'straight-through' DB9 pin 
serial cable. (Male on one end, female on the other) The connection to the 
computer is electrically isolated by the 4N25 Opto-isolator. (This is necessary 
so the phone line isn't shorted out to earth GND) The connection is TX only. 
This means that the information can only be sent from the DTMF decoder to the 
computer. Open HyperTerminal and setup a new connection for the appropriate COMM 
port. Set BAUD to 9600 8-N-1. Go into ASCII setup and make sure "Append line 
feeds to incoming line ends" is checked.</P>
<P>Upon power up the DTMF decoder will send the message "DTMF Decoder by 
www.infidigm.net" to HyperTerminal along with the last 234+ received digits from 
EEPROM. Every time a DTMF is received, the decoder will send the digit to 
HyperTerminal.</P>
<P>NOTE - The sensitivity of the decoders chip can be adjusted by changing R7 
and R8. Where Av = R8 / R7. The schematic shows Av = 1</P>
<H2>Parts List</H2>
<P>The list includes parts for the DTMF Decoder. All part numbers are for 
Digikey unless their is a link to another supplier. 
<TABLE>
  <TBODY>
  <TR>
    <TD>Quantity</TD>
    <TD>Value</TD>
    <TD>Description</TD>
    <TD>Digikey Part No.</TD>
    <TD>Component</TD></TR>
  <TR>
    <TD>1</TD>
    <TD>78L05</TD>
    <TD>+5V Regulator</TD>
    <TD>296-1365-1-ND</TD>
    <TD>U1</TD></TR>
  <TR>
    <TD>1</TD>
    <TD>MCP120</TD>
    <TD>Supply Supervisor</TD>
    <TD>MCP120-450DI/TO-ND</TD>
    <TD>U5</TD></TR>
  <TR>
    <TD>1</TD>
    <TD>AT90S2313</TD>
    <TD>Microprocessor</TD>
    <TD>AT90S2313-10PI-ND</TD>
    <TD>U2</TD></TR>
  <TR>
    <TD>1</TD>
    <TD>MT8870DE</TD>
    <TD>DTMF Decoder</TD>
    <TD><A href="http://www.e-sonic.com/">E-SONIC</A></TD>
    <TD>U4</TD></TR>
  <TR>
    <TD>1</TD>
    <TD>4N25</TD>
    <TD>Opto-isolator</TD>
    <TD>160-1300-5-ND</TD>
    <TD>U3</TD></TR>
  <TR>
    <TD><BR></TD></TR>
  <TR>
    <TD>1</TD>
    <TD>10uF</TD>
    <TD>Dielectric</TD>
    <TD>P10316-ND</TD>
    <TD>C1</TD></TR>
  <TR>
    <TD>4</TD>
    <TD>4.7 uF</TD>
    <TD></TD>
    <TD>P1199-ND</TD>
    <TD>C6,7,9,10</TD></TR>
  <TR>
    <TD>3</TD>
    <TD>0.1 uF</TD>
    <TD></TD>
    <TD>P4525-ND</TD>
    <TD>C2,4,8</TD></TR>
  <TR>
    <TD>2</TD>
    <TD>18pF</TD>
    <TD></TD>
    <TD>P4840-ND</TD>
    <TD>C11,C12</TD></TR>
  <TR>
    <TD><BR></TD></TR>
  <TR>
    <TD>1</TD>
    <TD>4.7K</TD>
    <TD>1/4 Watt</TD>
    <TD>4.7KQBK-ND</TD>
    <TD>R4</TD></TR>
  <TR>
    <TD>3</TD>
    <TD>10K</TD>
    <TD>1/4 Watt</TD>
    <TD>10KQBK-ND</TD>
    <TD>R1,2,6</TD></TR>
  <TR>
    <TD>2</TD>
    <TD>47K</TD>
    <TD>1/4 Watt</TD>
    <TD>47KQBK-ND</TD>
    <TD>R7,R8</TD></TR>
  <TR>
    <TD>1</TD>
    <TD>390K</TD>
    <TD>1/4 Watt</TD>
    <TD>390KQBK-ND</TD>
    <TD>R9</TD></TR>
  <TR>
    <TD>1</TD>
    <TD>20K POT</TD>
    <TD>Vertical POT</TD>
    <TD>36G24-ND</TD>
    <TD>R5</TD></TR>
  <TR>
    <TD><BR></TD></TR>
  <TR>
    <TD>1</TD>
    <TD>16x2</TD>
    <TD>LCD</TD>
    <TD>73-1025-N</TD>
    <TD>LCD</TD></TR>
  <TR>
    <TD>1</TD>
    <TD></TD>
    <TD>RJ 11 Jack</TD>
    <TD>CCM9000-ND</TD>
    <TD>Phone</TD></TR>
  <TR>
    <TD>1</TD>
    <TD></TD>
    <TD>1/8 Audio Jack</TD>
    <TD>CP-3543N-ND</TD>
    <TD>Audio</TD></TR>
  <TR>
    <TD>1</TD>
    <TD></TD>
    <TD>9V Connector</TD>
    <TD>BS6I-HD-ND</TD>
    <TD>Batt</TD></TR>
  <TR>
    <TD>1</TD>
    <TD></TD>
    <TD>20-pin Socket</TD>
    <TD>A9420-ND</TD></TR>
  <TR>
    <TD>2</TD>
    <TD></TD>
    <TD>Push Buttons</TD>
    <TD>P8006S-ND</TD>
    <TD>S1,S2</TD></TR>
  <TR>
    <TD>2</TD>
    <TD>0.1"</TD>
    <TD>7-pin Header strip</TD>
    <TD>WM4005-ND</TD></TR>
  <TR>
    <TD>1</TD>
    <TD>3.579545 Mhz</TD>
    <TD>3.58 Mhz Crystal</TD>
    <TD>300-6001-ND</TD>
    <TD>Y1</TD></TR>
  <TR>
    <TD>1</TD>
    <TD>Female</TD>
    <TD>DB9 Connector</TD>
    <TD>A2047-ND</TD>
    <TD>DB9</TD></TR></TBODY></TABLE></P>
<H2>Files</H2>
<P><A href="http://www.infidigm.net/projects/dtmf2/dtmf2sch.jpg">DTMF decoder 
Schematic</A><BR><A 
href="http://www.infidigm.net/projects/dtmf2/dtmf2pcb.pdf">PCB Layout</A> <A 
href="http://www.infidigm.net/projects/dtmf2/dtmf2pcbm.pdf">(Mirror 
image)</A><BR><A href="http://www.infidigm.net/projects/dtmf2/dtmf2pp.jpg">Parts 
Placement</A><BR><A href="http://www.infidigm.net/projects/dtmf2/dtmf2.zip">All 
Program Project Files.</A><BR><A 
href="http://www.infidigm.net/projects/dtmf2/dtmf2.c">C Source Code</A><BR><A 
href="http://www.infidigm.net/projects/dtmf2/dtmf2.hex">Hex file for 
AT90S2313</A></P>
<P><A 
href="http://www.atmel.com/dyn/resources/prod_documents/DOC0839.PDF">AT90S2313 
Data Sheet (Microprocessor)</A><BR><A 
href="http://assets.zarlink.com/products/datasheets/zarlink_MT8870D_MAR_97.pdf">MT8870DE 
Data Sheet (DTMF Decoder)</A><BR><A 
href="http://www.optrex.com/SiteImages/PartList/SPEC/16207cae.pdf">LCD Data 
Sheet</A></P></BODY></HTML>

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