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Mechanics and Construction / Re: Trumpet Playing Robot... how does it work?
« Last post by piesobese on February 11, 2024, 03:15:47 AM »
All they have to do is vibrate the air entering the trumpet at the frequency they want to influence the pitch.  Lips do this for humans, but my guess is that they used some sort of flapper inside the mouth of the robot.

Here is a better view of a couple Aerophone playing robots.  Toyota's Robot Quartet Band.  You can see there is nothing protruding from the mouth, and the orifice is smooth.
I was truly enlightened with this new perspective.
Misc / American Robots 1978 robot build plans $200 reward
« Last post by crmfghtr on January 30, 2024, 10:57:24 AM »
I had these plans from American Robots in 1979 that would still hold up today!  I lost them.  They were for a 5 foot robot that resembled Robby The Robot, with working claws motors etc.  I lost them when I moved once and have been hunting for them ever since.  Going to be hard to recover something that old but here is hoping!
Electronics / B-Robot EVO 2 Circuit Board Replacement
« Last post by shdo1937 on January 18, 2024, 09:40:22 AM »
Hello, I am working on constructing the B-Robot EVO 2, however, I can not find the control board they list:

https://jjrobots.com/product/devia-robo ... oard-v1-0/

I need a control board with the same capabilities to replace this one and move forward. Does anyone have any suggestions? Anything will help because I am new to this, thank you!
Misc / Re: Hello from Brisbane Australia looking to connect with locals
« Last post by faxprayer on January 18, 2024, 04:00:44 AM »
It's great that localities have so many competitions. I hope my product will be launched at a local exhibition soon.
For Sale / Tracked lawn mower robot with engine and 12v 250w track motors
« Last post by Saso on December 18, 2023, 04:42:39 AM »
For sale
Tracked robot lawn mower remote control

12 v 250w motors
200ccm 6 hp engine
Electric start
40amp battery
45amp generator

Robot Videos / Tracked robot with engine and 12v 250w tracks motors
« Last post by Saso on December 14, 2023, 06:52:40 AM »
Here is video of tracked robot
Aprox 90cm long, 100cm wide
Huge pulling power
3,5km/h speed


With headlight

Cutting big grass


For Sale / Tracks 900mm long, weigjt 25kg each, motors 12v 250w
« Last post by Saso on December 14, 2023, 06:38:49 AM »
Hej For sale tracks complete with motors
900mm long
Weight 25kg each
Motors 12v 250w
Speed 3,5km/h
Huge pulling power

Mechanics and Construction / Re: Trumpet Playing Robot... how does it work?
« Last post by Filip on November 21, 2023, 05:31:47 PM »
Can you text to me I want to go down to the rabbit hole like you said :)

Electronics / Waving detection for Halloween animatronics
« Last post by perigalacticon on November 17, 2023, 03:25:24 PM »
I have several animatronic figures I use outdoors for Halloween.  They riun on Esp8266 microcontrollers and have mp3 players, addressable leds, and std cheap pir motion sensors and they work pretty well now.  I thought I would try to upgrade to some sort of gesture detection for next year.  I'd like to try to detect kids waving at the props, of course disregarding other motion.  I've done preliminary testing with digital lux sensors and ultrasonics, and so far the results aren't good enough.  With signal processing I thought I could detect waving motion in a sensor signal.  That's like a frequency of 2-4 Hz (cycle = back and forth).  Do you think there is a way to do this without resorting to machine vision?  The number and type of sensors available is bewildering.  This should be easy, right?
Hello! I'm new  to the society of robots forum. I am an undergraduate who is focusing on a tracked robot build as a project. However my background is not on engineering side but more of computing, but I am in charge of building the robot. Is there a place or sources that I could get information to build a tracked robot or the track system. I would be very grateful. I will be posting my journey of building the robot here and keep you guys updated!
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