tevans
Brazil
Asked
— Edited
Hi there. Im building my first Robot and Im very impressed about the possibilities on the EZ-B.. At this point I really need a help. Im trying to use some leds to lipsync the sound that comes from the sound board (its the robots mouth...). Well, I hooked up the led on a digital port and use the sound servo control... the problem is: the LED NEVER GOES OFF! Even when the value is Zero. And the other problem. It responds to the MIC signal, but not to the soundboard... can someone help me on that ? thank you! best regards from your friends in Brazil.
Can you draw the connectivity of your circuit and the script command used as this will help others to understand more your setup. I am not sure if this link can help.
Rectified link
The sound servo panel is for moving a servo in sync to a sound. You really need another circuit like a motor controller that can then drive a LED. The sound board just outputs stored sounds although a mic near the PC speaker could pick this up.
So I think basically you need a circuit that takes the servo control pulses and converts them to a DC voltage level. Everything else you need is pretty much there
Sound servo does work for lamps/LEDS, I had the control for Melvin's mouth but it was controlled via a TIP transistor. I don't recall if it was ever fully off but it did vary the brightness depending on the sounds that come out of my PCs default audio device.
@hhammoud's link is wrong, here is the correct url for the previous topic about it.
Here is another topic from way back when I asked about it
Here is another method means trashing a servo though but they are cheap enough Ignore the radio control stuff the servo would just plug into the EZ-B board
@rich : this is the link I meant ...but seems I had an issue while copying the link. I should have verified it....thx for posting the proper link.
Hi Friends. Thanks for the ideas... I think that trash an servo circuit to drive the led could works... but how do I catch the sound signal from the soundboard and convert that into a value to drive the servo ? I mean.. it works with the mic sound.. but that's not exactly what I want...
Thank you very much for your help. I'm looking forward to post some pic and videos of my prototype..
I have a similar issue that @tevans is bringing up. Sound servo appears to only work with the microphone input. This is fine if the sound is coming from the device that houses the mic. However, I have an onboard BT speaker.
It would be great if the sound servo control allowed you to select where the sound was coming from. I can see where this could get complicated since some folks use MP3 shields, though.
You could always use the +ve wire of the speaker to trigger (or even power) the LED...
Or Digital Ports can read PWM, or analogue can read ADC. If you can somehow set up the speaker wire to output between 0 and 5v depending on volume you could read this and convert that to LED brightness...
Just food for thought
Edit: Indestructables have a tutorial on sound reactive LEDs that may be work a look at.