Answers.Body: <p>Balanc3r is a good alternative for gyro-boy:
  <a href="http://robotsquare.com/2014/06/23/tutorial-building-balanc3r/" rel="nofollow noreferrer">http://robotsquare.com/2014/06/23/tutorial-building-balanc3r/</a></p>
  
  <p>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...</p>
  
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2018-09-03T17:27:33.930Z
Answers.Text: 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.
Answers.UserDisplayName: Allan Xu
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2018-09-04T12:21:17.737Z
Answers.Text: 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...
Answers.UserDisplayName: Michael Verschaeve
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2018-09-04T15:26:52.013Z
Answers.Text: 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.
Answers.UserDisplayName: Allan Xu
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2018-09-05T06:55:03.320Z
Answers.Text: Have you tried ordering from lego education ? To me it seems available there at regular price: https://education.lego.com/en-us/products/ev3-ultrasonic-sensor/45504
Answers.UserDisplayName: Michael Verschaeve
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2018-09-05T14:35:41.933Z
Answers.Text: @AllanXu Have you looked on Bricklink? Used IR sensors go for as low as $13 USD. https://www.bricklink.com/v2/catalog/catalogitem.page?P=95654#T=S&C=0&O={%22color%22:0,%22iconly%22:0}
Answers.UserDisplayName: MindS1
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2018-09-06T07:27:28.737Z
Answers.Text: @MindS1 IR sensors are indeed common. We're looking for the ultrasonic sensor. Doesn't seem to be offered in the US on bricklink at cheaper price than RRP, but also not seeing 500% higher prices...
Answers.UserDisplayName: Michael Verschaeve
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2018-09-03T08:42:05.993Z
Answers.LastActivityDate: 2018-09-03T08:42:05.993Z
Answers.UserDisplayName: Michael Verschaeve
Body: <p>The EV3 Ultrasonic Sensor (45504) has been out of stock for a long time.  Is the sensor discontinued due to an accuracy problem?</p>
  
  <p>Is there an alternate version of "Gyro Boy" that works without the Ultrasonic Sensor and uses Infrared instead? </p>
  
  <p><a href="https://le-www-live-s.legocdn.com/sc/media/lessons/mindstorms-ev3/building-instructions/ev3-model-core-set-gyro-boy-f8a14d8e3d0e63fa23b87f798bf197f4.pdf" rel="nofollow noreferrer">https://le-www-live-s.legocdn.com/sc/media/lessons/mindstorms-ev3/building-instructions/ev3-model-core-set-gyro-boy-f8a14d8e3d0e63fa23b87f798bf197f4.pdf</a></p>
  
Comments.ContentLicense: CC BY-SA 4.0
Comments.CreationDate: 2018-09-02T19:16:46.317Z
Comments.Text: You don't need to use the ultrasonic sensor if you don't want to. You can build whatever you want.
Comments.UserDisplayName: MindS1
Comments.ContentLicense: CC BY-SA 4.0
Comments.CreationDate: 2018-09-02T21:58:55.917Z
Comments.Text: @MindS1, I know that, but the program probably won't work and I have to modify it correct?
Comments.UserDisplayName: Allan Xu
Comments.ContentLicense: CC BY-SA 4.0
Comments.CreationDate: 2018-09-04T12:36:23.183Z
Comments.Text: 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.
Comments.UserDisplayName: MindS1
Tags: <ev3><sensor-ultrasonic><sensor><gyro>
Title: Why is the EV3 Ultrasonic Sensor (45504) out of stock?
UserDisplayName: Allan Xu
ThreadText: # Why is the EV3 Ultrasonic Sensor (45504) out of stock?
  
  (Asked by: username_0 on 2018-09-02)
  
  The EV3 Ultrasonic Sensor (45504) has been out of stock for a long time. Is the sensor discontinued due to an accuracy problem?
  
  Is there an alternate version of "Gyro Boy" that works without the Ultrasonic Sensor and uses Infrared instead?
  
  <https://le-www-live-s.legocdn.com/sc/media/lessons/mindstorms-ev3/building-instructions/ev3-model-core-set-gyro-boy-f8a14d8e3d0e63fa23b87f798bf197f4.pdf>
  
  **Tags:** ev3, sensor-ultrasonic, sensor, gyro
  > **Comments:**
  > **username_1**: You don't need to use the ultrasonic sensor if you don't want to. You can build whatever you want.  
  > **username_0**: @MindS1, I know that, but the program probably won't work and I have to modify it correct?  
  > **username_1**: 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.  
  
  ---
  
  ## 1 answers
  
  ### Answer by username_2 on 2018-09-03. Score: 3 | Accepted answer
  
  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...
  
  > **Comments:**
  > **username_0**: 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.  
  > **username_2**: 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...  
  > **username_0**: 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.  
  > **username_2**: Have you tried ordering from lego education ? To me it seems available there at regular price: https://education.lego.com/en-us/products/ev3-ultrasonic-sensor/45504  
  > **username_1**: @AllanXu Have you looked on Bricklink? Used IR sensors go for as low as $13 USD. https://www.bricklink.com/v2/catalog/catalogitem.page?P=95654#T=S&C=0&O={%22color%22:0,%22iconly%22:0}  
  > **username_2**: @MindS1 IR sensors are indeed common. We're looking for the ultrasonic sensor. Doesn't seem to be offered in the US on bricklink at cheaper price than RRP, but also not seeing 500% higher prices...  
  
  ---
  
  