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Should this work with a 3xRCA to AV cable? Getting video noise, no sound #31
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Please note that these signals should be 75Ohm impedance matched. Do you
have all shieldings connected to gnd?
Try this:
To pin 25 - positive video (yellow), outer/shield directly to GND
To pin 26 - throug capacitor 10uF to left and right positive audio,
outer/shield directly to GND
Regards,
Chris
niedz., 13 gru 2020 o 14:34 David Vilela <[email protected]>
napisał(a):
I'm trying to make the sketch work in a ESP32 mini, and since I do not
have any composite video-capable devices at home, I'm trying a 3xRCA to AV
cable. After a few seconds connected, I can see some noisy vertical lines
and some noisy colors from time to time, but no sound. Not sure if it's a
connection problem of if there is something I'm missing. Maybe I didn't
understand the scheme.
What I've done:
- Solder positive of video cable to pin 25
- Solder negative of video cable to ground
- Solder both audio left and right positives to pin 26 through a 1k
resistor (and set pin 26 as audio out in video_out.h)
- Solder both audio left and right negatives to ground through a 10nf
capacitor
[image: photo_2020-12-13_14-24-55]
<https://user-images.githubusercontent.com/1871782/102013285-51432e00-3d4f-11eb-8455-2d035ac67780.jpg>
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@cziter15, I read here the following comment:
That's why I soldered the audio L/R outter/negative/shielding through the capacitor to ground. So should I solder the capacitor to the positive then? What about the resistor? The scheme lists a 1k resistor in the audio line. Should I remove it? I'm a little confused about the 750 ohm impedance matching.
This is how I have it:
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Verify that you are using the correct connections for your device on the other end. |
Interesting. How should I do that? The device is a cheap projector that has no instructions manual. Concerning the connections I listed on my last message, do you feel they're correct? |
I've tried with another ESP32 on a breadboard. I've tried plugging pin 25 to every of the 3 different lines and none seems to output a video signal. Surely I must be doing something very wrong. |
I can confirm that Bitluni CompositeVideo repository works with the actual cabling, and I can see the composite video demo. Still, esp_8_bit does not output video nor audio yet. Edit: Corn64 fork also seems to output both video and audio (resoldering was needed due to TRRS), but as soon as my DualShock4 is detected in pairing mode, the program crashes. |
try changing the board type. I had video noise until I switched board type in the arduino IDE. |
You can not use pin 26 for audio! |
I'm trying to make the sketch work in a ESP32 mini, and since I do not have any composite video-capable devices at home, I'm trying a 3xRCA to AV cable. After a few seconds connected, I can see some noisy vertical lines and some noisy colors from time to time, but no sound. Not sure if it's a connection problem of if there is something I'm missing. Maybe I didn't understand the scheme.
What I've done:
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