Getting signal but black screen
Opened this issue · 5 comments
GoogleCodeExporter commented
What steps will reproduce the problem?
1. Use latest tvout library
2. 470 ohm and 1k ohm resistor
3. Plug into tv
What is the expected output? What do you see instead?
There should be an image on the screen. I am getting a signal because each tv
goes from no signa; to a black screen. I have used two arduino uno rev 3
boards and one atmega 2560 with same result. I tried with both pal and ntsc.
On one screen I am able to see a single pixel line faintly with ntsc.
What version of the product are you using? On what operating system?
Arduino rev 3, atmega 2560. Arduino 1.0.5. Mac OS X Maverics 10.9.1
Please provide any additional information below.
Original issue reported on code.google.com by he...@evanstoddard.me
on 27 Jan 2014 at 9:15
GoogleCodeExporter commented
WB7ODYFred here, This TVOutBeta1 code worked great on my OSEPP Arduino UNO
board a year ago. Even the Audio output fed into the TV audio input ( RED RCA
jack, or White RCA Jack).
Visit this instructable and re-check your wiring setup to the atmega 2560.
Maybe different pin numbers are used for the atmega 2560 board than the UNO
Board. Realize the difference between Arduino PCB Board PIN numbering and the
actual microcontroller pin numbering.
from http://code.google.com/p/arduino-tvout Arduino PCB Board Pin Numbers
Sync Video Audio
m1280,m2560 B 5 A 7 B 4
UNO 7 9 11
http://www.instructables.com/id/TV-Out-with-Arduino/?ALLSTEPS
I give the source code for my test pattern that you can test for yourself on
your atmega 2560. You might have to change the SYNC, VIDEO, AUDIO Port Output
pin numbers in the TVOut code section to match your atmega controller pin
numbers.
Wish you well on finishing this project. Comment back here, both with
questions and what you did to make it work. Best wishes, Fred
Original comment by WB7ODYF...@yahoo.com
on 29 Jan 2014 at 5:36
GoogleCodeExporter commented
These resistors Sync 470 ohms & Video 1000 ohms worked with 5V power supplied
to the Arduino UNO Rev. 3. Is the clock frequency 16 Mhz on your board?
If you are running the Arduino with 3.3V power, then change the resistors to a
different value Sync 270 ohms and Video 680 ohms.
See this web page of information that was also given above in Issue 66.
http://www.incrediblediy.com/2013/03/connecting-arduino-pro-33v8mhz-to-tv.html
Original comment by WB7ODYF...@yahoo.com
on 29 Jan 2014 at 6:04
GoogleCodeExporter commented
I do know the pin differences and I know that both operate at 5v and I'm using
the correct resistor values. I will check on the clock frequency. That may be
my problem.
Original comment by he...@evanstoddard.me
on 3 Feb 2014 at 5:00
GoogleCodeExporter commented
So the arduinos are all 5v at 16mhz and everything seems correct but still no
video.
Original comment by evanrsto...@gmail.com
on 3 Feb 2014 at 5:39
GoogleCodeExporter commented
Im having a similar problem with my arduino. For some reason on the RCA hookup
it wont work with the resistors although if i just hook it directly into the
board without resistors it works any idea why the resistors wont work with the
RCA setup.
Original comment by dariuspe...@gmail.com
on 4 Dec 2014 at 9:50