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I leanred that EV3 Ultrasonic Sensor (45504) is out of stock for a long time.

I wonder if the sensor is being discontinued due to accuracy problem?

Is there any alternate version of "Gyro Boy" that work without Ultrasonic Sensor and use Infraread instead?

https://le-www-live-s.legocdn.com/sc/media/lessons/mindstorms-ev3/building-instructions/ev3-model-core-set-gyro-boy-f8a14d8e3d0e63fa23b87f798bf197f4.pdf

  • You don't need to use the ultrasonic sensor if you don't want to. You can build whatever you want. – MindS1 Sep 2 '18 at 19:16
  • @MindS1, I know that, but the program probably won't work and I have to modify it correct? – Allan Xu Sep 2 '18 at 21:58
  • you're correct, you'll have to modify the program. It should be as simple as deleting the code that uses the IR sensor to respond to the remote, and adding whatever function you want using the ultrasonic sensor block. – MindS1 Sep 4 '18 at 12:36
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Balanc3r is a good alternative for gyro-boy: http://robotsquare.com/2014/06/23/tutorial-building-balanc3r/

However, why do you conclude that the 45504 sensor is out of stock? In my region (Belgium) it can be ordered from the lego website and is listed as "Available", also it is contained in the core educational set (45544) which is certainly still available from various sources...

  • Thank you for help. 45504 sensor is out of stock in larger markets such as US for a long time. That ususally is an indication that the product is discontinued, since the distributor soes not bother with replenish stock. – Allan Xu Sep 3 '18 at 17:27
  • I switched the region to S@H to US and it indeed says "temporarily" out of stock. I'm inclined to think that this is indeed temporarily as this is a popular item with FLL teams and other educational projects... – Michael Verschaeve Sep 4 '18 at 12:21
  • Yes, I have been waiting for the part availability for a long time and no luck. The 3rd part sellers price is ~500% higher than the listed price on lego site. If you happen to know a good source please share, since I really like to to be able to work with this sensor. – Allan Xu Sep 4 '18 at 15:26
  • Have you tried ordering from lego education ? To me it seems available there at regular price: education.lego.com/en-us/products/ev3-ultrasonic-sensor/45504 – Michael Verschaeve Sep 5 '18 at 6:55
  • @AllanXu Have you looked on Bricklink? Used IR sensors go for as low as $13 USD. bricklink.com/v2/catalog/…{%22color%22:0,%22iconly%22:0} – MindS1 Sep 5 '18 at 14:35

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