| Author |
Message |
showstopper123
Joined: 04 Oct 2008
Posts: 2
|
 07 Oct 2008 16:51 Re: DOT-matrix display(LED matrix) points for a good design. |
|
|
|
| can someone help me design a sequential ckt of a scrolling message without using a microcontroller?? is it even possible??
|
|
| Back to top |
|
 |
zuisti
Joined: 02 Jul 2004
Posts: 48
Helped: 2
|
| 08 Oct 2008 8:39 Re: DOT-matrix display(LED matrix) points for a good design. |
|
|
|
| showstopper123 wrote: |
| can someone help me design a sequential ckt of a scrolling message without using a microcontroller?? is it even possible?? |
I believe it's possible but not worthly. Using a big eprom for storing the individual program steps with data bits and a clock driving address counter you can simulate what a small uC does. This willl be more complicated and expensive, and it's not so easy to determine the programming of the eprom.
Study the program steps of a PIC scrolling ckt (for example)!
zuisti
|
|
| Back to top |
|
|
yupng
Joined: 16 Jul 2008
Posts: 36
|
| 15 Oct 2008 3:00 Re: DOT-matrix display(LED matrix) points for a good design. |
|
|
|
I am trying to build an Infrared Transmitter and receiver that will take an RS-232 signal, convert it into TTL, then Pulse Width Modulation would be applied, and then finally transmitted. On the reciever side, basically extracting the orignal TTL signal from the Pulse Width Modulated signal and converting it back to RS-232.
Anyone can give me some guidance about this project?
|
|
| Back to top |
|
|
blueroomelectronics
Joined: 17 Sep 2006
Posts: 1230
Helped: 61
Location: Toronto, Canada
|
| 15 Oct 2008 5:46 Re: DOT-matrix display(LED matrix) points for a good design. |
|
|
|
| yupng wrote: |
I am trying to build an Infrared Transmitter and receiver that will take an RS-232 signal, convert it into TTL, then Pulse Width Modulation would be applied, and then finally transmitted. On the reciever side, basically extracting the orignal TTL signal from the Pulse Width Modulated signal and converting it back to RS-232.
Anyone can give me some guidance about this project? |
What does this have to do with dot matrix displays?
|
|
| Back to top |
|
|
yupng
Joined: 16 Jul 2008
Posts: 36
|
| 16 Oct 2008 3:34 Re: DOT-matrix display(LED matrix) points for a good design. |
|
|
|
| blueroomelectronics wrote: |
| yupng wrote: |
I am trying to build an Infrared Transmitter and receiver that will take an RS-232 signal, convert it into TTL, then Pulse Width Modulation would be applied, and then finally transmitted. On the reciever side, basically extracting the orignal TTL signal from the Pulse Width Modulated signal and converting it back to RS-232.
Anyone can give me some guidance about this project? |
What does this have to do with dot matrix displays? |
i had done a dot matrix display project which is using PC RS 232 port to send the data display device. I used cable to connect between RS 232 port and display device. Now i want change it to Infarad connection.
|
|
| Back to top |
|
|
yupng
Joined: 16 Jul 2008
Posts: 36
|
| 21 Oct 2008 9:15 Re: DOT-matrix display(LED matrix) points for a good design. |
|
|
|
Anyone know how to transmit the data using RS232 port with Infarad? No cable is used.
For Example:
i already built a dot-matrix display project which the data transfer from RS232 port to dot-matrix display device with using cable connect between them.
So now, no cable is used to transfer the data. Only transfer data wireless(any wireles type but prefer IR).
Anyone can teach me how 2 do it?
Pls HELP...............
|
|
| Back to top |
|
|
Bronx68
Joined: 08 Nov 2008
Posts: 1
|
| 10 Nov 2008 23:47 Re: DOT-matrix display(LED matrix) points for a good design. |
|
|
|
I am looking for a source of pc boards to drive dot matrix (led scrolling message). I need only the pc boards since we have our own led arrays.
Requirements:
40 columns okay but prefer 80 columns
USB interface to pc for loading messages
IR interface for loading messages
ray.phillips(at)articulux.com
|
|
| Back to top |
|
|
blueroomelectronics
Joined: 17 Sep 2006
Posts: 1230
Helped: 61
Location: Toronto, Canada
|
| 11 Nov 2008 3:00 DOT-matrix display(LED matrix) points for a good design. |
|
|
|
| What arrays are you trying to drive?
|
|
| Back to top |
|
|
yupng
Joined: 16 Jul 2008
Posts: 36
|
| 27 Nov 2008 5:44 Re: DOT-matrix display(LED matrix) points for a good design. |
|
|
|
Hey to everyone....i want built a "Wireless Announcement Board". I would like to use a PC to send the data out(using RS232 port) to Microcrontroller,the data(a word or character) will display on dot-matrix screen. I found many similiar project in this forum and most of the project using cable to connect RS232 port and microntroller. For me, i want to make it wireless(no cable is used to connect RS232 port and microntroller).
Anyone can help me? Pls.......
Anyone of u have a good idea for this "Wireless Announcement Board" beside the meathod i meantion.
|
|
| Back to top |
|
|
