# LEDRGB jacdac: simulator not fully functional on mobile

**URL:** <https://forum.makecode.com/t/ledrgb-jacdac-simulator-not-fully-functional-on-mobile/11928>\
**Category:** micro:bit\
**Created:** [January 28, 2022, 6:13pm UTC](https://forum.makecode.com/t/ledrgb-jacdac-simulator-not-fully-functional-on-mobile/11928 "2022-01-28T18:13:33Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![frank\_schmidt](https://avatars.discourse-cdn.com/v4/letter/f/7993a0/32.png) [@frank\_schmidt](https://forum.makecode.com/u/frank_schmidt)\
**Post date:** [January 28, 2022, 6:13pm UTC](https://forum.makecode.com/t/ledrgb-jacdac-simulator-not-fully-functional-on-mobile/11928/1 "2022-01-28T18:13:33Z")

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> **[JDheartRate3](https://makecode.microbit.org/26221-28401-60864-35885)**
>
> Made with ❤️ in Microsoft MakeCode for micro:bit.

on my laptop this program shows the button, heart rate and a text display in simulator; which shows a different heart rate when you move the yellow slider and click the button. It also shows a blinking LED which changes color as in RGB. Hit the simulator tab, the monitor icon and then the button, maybe you have to hit monitor 2 times to make LED bulb show in simulator. OK, all good. Now, try to import the above URL into Microbit app on Android or iOS device. I do not see the LED simulator on my iPhones nor on my Android phones. Not sure why this is…