# Video Micro:bit V2 with Mbit Bluetooth app. for bot car Robotbit

**URL:** https://forum.makecode.com/t/video-micro-bit-v2-with-mbit-bluetooth-app-for-bot-car-robotbit/8934
**Category:** Show & Tell
**Created:** [June 27, 2021, 6:30am UTC](https://forum.makecode.com/t/video-micro-bit-v2-with-mbit-bluetooth-app-for-bot-car-robotbit/8934 "2021-06-27T06:30:19Z")
**Posts on this page:** 1
**Showing post:** 6

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### Author: ![bsiever](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.makecode.com/bsiever/32/1032_2.png) [@bsiever](https://forum.makecode.com/u/bsiever)
#### Post date: [July 13, 2021, 1:24am UTC](https://forum.makecode.com/t/video-micro-bit-v2-with-mbit-bluetooth-app-for-bot-car-robotbit/8934/6 "2021-07-13T01:24:13Z")

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Not compiling may be due to being out of memory on the micro:bit. It’s possible that if you’re on a V1 moving to a V2 will help. I think Frank’s example of compilation breaking after adding in just one more feature is likely due to this.

Extensions can use a lot of memory and, in some cases, can be “trimmed” a bit. For example, in response to an earlier thread of conversation about the MBit app, I made a simplified MaQueen library that omits some features. (Here’s the discussion: [Android app/Discord - #13 by bsiever](https://forum.makecode.com/t/android-app-discord/7696/13) ; Here’s the URL for the condensed MaQueen extension — it can be pasted in when searching for an extension: [https://github.com/bsiever/pxt-maqueen](https://github.com/bsiever/pxt-maqueen))

Bill

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