Program At90s2313 With Arduino Lcd Connection
Next, connect the LCD's pin 6 (EN) to the Arduino's digital pin 8. EN is the enable pin on the LCD, this is used to tell the LCD that data is ready for reading. Next, we have to connect the four data pins on the LCD. Connect the LCD's pin 14 (DB7) to the Arduino's digital pin 12. Then, connect the LCD's pin 13 (DB6) to the Arduino's digital pin 11. Product description: AVR 2 programmer compatible with USBasp ISP. The programmer 'USBasp AVR' is fully compatible with the programmer 'USBasp' created by Thomas Fischl. It can be used to program microcontrollers from the AVR family from ATMEL via the USB port of the PC.
Disclaimer
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.
Description
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.
Changes made in Rev 2
- Connects directly to PC without an interface.
- Displays the line number (1 - 19) when scrolling.
- Has software filtering for button contact de-bounce.
- Properly displays '#' and '*' digits.
- Improved power consumption from 21.7mA to now only 12mA !
- Program written in C.
- Useless Microphone circuit removed.
Assembly
The DTMF Decoder 2 can be assembly by anyone with general electronic knowledge and soldering skills.
A PCB layout 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 (E-Sonic 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.
Review the schematic and parts placement diagram 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 (short side towards LCD). Solder the longer side of the headers into the DTMF decoder PCB. Attach the LCD and decoder together with hot glue or other means.
Feel free to email me with questions / problems at 'drwho at infidigm dot net'. I may not respond to all questions.
Programming
Programming the microcontroller is the next step. The micro is a AVR AT90S2313 made by ATMEL. An AVR socket programmer is required. Here is a list of programmers.
- STK500 Development board (Search for STK500) .
- Make you own AVR Socket Programmer. 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.
to the micro. Instructions are provided with the specific programmer. If you make your own Socket programmer, use Pony Prog 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.
NOTE - If you are using the ATTINY2313, set the Fuse setting 'external oscillator, 3-8 Mhz, 64mS startup time'. Make sure that the Fuse setting 'Divide clock by 8' is NOT set.
NOTE - Rev 1 and rev 2 software are interchangeable in both rev 1 and rev 2 of the decoder.
The Program
Only read this section if you wish to modify the program!
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 (WinAVR 3.4.3 February 14, 2005). Read the beginners guide to learn how to install GCC. Once you have GCC working, download the Project Files for Programmers NotePad. and unzip them to a directory of your choosing. Run Programmers NotePad ( /WinAVR/pn/pn.exe). In PN go 'File-->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-->Make All' to test the Compiler. The program is well documented and self explanatory.Usage
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.
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. Alif complete novel download pdf. Set BAUD to 9600 8-N-1. Go into ASCII setup and make sure 'Append line feeds to incoming line ends' is checked.
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.
NOTE - The sensitivity of the decoders chip can be adjusted by changing R7 and R8. Where Av = R8 / R7. The schematic shows Av = 1
Parts List
The list includes parts for the DTMF Decoder. All part numbers are for Digikey unless their is a link to another supplier.| Quantity | Value | Description | Digikey Part No. | Component |
| 1 | 78L05 | +5V Regulator | 296-1365-1-ND | U1 |
| 1 | MCP120 | Supply Supervisor | MCP120-450DI/TO-ND | U5 |
| 1 | AT90S2313 | Microprocessor | AT90S2313-10PI-ND | U2 |
| or | Alternative Micro | ATTINY2313-20PI-ND | U2 | |
| 1 | MT8870DE | DTMF Decoder | E-SONIC | U4 |
| 1 | 4N25 | Opto-isolator | 160-1300-5-ND | U3 |
| 1 | 10uF | Dielectric | P10316-ND | C1 |
| 4 | 4.7 uF | P1199-ND | C6,7,9,10 | |
| 3 | 0.1 uF | P4525-ND | C2,4,8 | |
| 2 | 18pF | P4840-ND | C11,C12 | |
| 1 | 4.7K | 1/4 Watt | 4.7KQBK-ND | R4 |
| 3 | 10K | 1/4 Watt | 10KQBK-ND | R1,2,6 |
| 2 | 47K | 1/4 Watt | 47KQBK-ND | R7,R8 |
| 1 | 390K | 1/4 Watt | 390KQBK-ND | R9 |
| 1 | 20K POT | Vertical POT | 36G24-ND | R5 |
| 1 | 16x2 | LCD | 73-1025-N | LCD |
| 1 | RJ 11 Jack | CCM9000-ND | Phone | |
| 1 | 1/8 Audio Jack | CP-3543N-ND | Audio | |
| 1 | 9V Connector | BS6I-HD-ND | Batt | |
| 1 | 20-pin Socket | A9420-ND | ||
| 2 | Push Buttons | P8006S-ND | S1,S2 | |
| 2 | 0.1' | 7-pin Header strip | WM4005-ND | |
| 1 | 3.579545 Mhz | 3.58 Mhz Crystal | 300-6001-ND | Y1 |
| 1 | Female | DB9 Connector | A2047-ND | DB9 |
Files
DTMF decoder Schematic
PCB Layout(Mirror image)
Parts Placement
All Program Project Files.
C Source Code
Hex file for AT90S2313
Hex file for ATTINY2313
Grant green am i blue rar. AT90S2313 Data Sheet (Microprocessor)
MT8870DE Data Sheet (DTMF Decoder)
LCD Data Sheet
The JHD162A display controller is a monochrome LCD module which you can find bundled with various Arduino starter kits or on their own; usually in the price range of around $10.
Note: Although this guide has been written with the JHD162A in mind, any LCD display controller that is compatible with the Hitachi HD44780 interface will work; which is the majority of small display controllers like this.
The checklist of things we’ll need for this are:
- An Arduino Uno
- A HD44780 compatible LCD controller
- A 1k ohm resistor
- A 10k ohm resistor
- A 220 ohm resistor
- A breadboard and a bunch of jumper cables
The first thing you will need to do, more than likely, is solder the headers to the JHD162A module, as typically they do not come ready soldered together. Once you are able to connect it to your breadboard, it’s time to wire it all up as per the illustration and instructions below:
- Pin 1 to GND
- Pin 2 to 5v
- Pin 3 to GND through a 1k ohm resistor and to 5v through a 10k ohm resistor
- Pin 4 to Arduino pin 12
- Pin 5 to GND
- Pin 6 to Arduino pin 11
- Pin 11 to Arduino pin 5
- Pin 12 to Arduino pin 4
- Pin 13 to Arduino pin 3
- Pin 14 to Arduino pin 2
- Pin 15 to 5v through a 220 ohm resistor
- Pin 16 to GND
The resistors used to connect pin 3 to GND and 5v can be changed in order to change the contrast of the screen, or can alternatively be replaced with a 10k potentiometer; for this example though we will stick to the 1k and 10k resistors as this provides a good level of contrast.
Once finished wiring it up, you should have something that looks something like this (hopefully a bit tidier than mine!):
If you now provide power to your Arduino, you should see your screen power up along side it. However, a blank LCD screen isn’t very impressive or of much use, so we need to put some code behind it to print some text!
Open up the Arduino IDE and paste in the sketch below:
The LiquidCrystal library that we imported and used in this sketch handles most of the work for us, allowing us to simply specify the strings we want to write to the screen pretty much; in this case flashing some of the lyrics of All The Things by Dual Core.
If you power up the Arduino now and upload the sketch to it, you should have something akin to the below video:
For more information on the JHD162A, you can refer to the datasheet, which you can Download Here.