# Radio compatibility between V1 and V2

**URL:** <https://forum.makecode.com/t/radio-compatibility-between-v1-and-v2/5284>\
**Category:** micro:bit\
**Created:** [December 31, 2020, 7:01pm UTC](https://forum.makecode.com/t/radio-compatibility-between-v1-and-v2/5284 "2020-12-31T19:01:43Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![FabFru](https://avatars.discourse-cdn.com/v4/letter/f/ac8455/32.png) [@FabFru](https://forum.makecode.com/u/FabFru)\
**Post date:** [December 31, 2020, 7:01pm UTC](https://forum.makecode.com/t/radio-compatibility-between-v1-and-v2/5284/1 "2020-12-31T19:01:44Z")

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Has anyone succeeded to send signal radios between two MicroBit of different version - V1 and V2?  
I tried but there is something wrong because one board don’t communicate with another.

Happy new year!

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**Author:** ![darzu](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.makecode.com/darzu/32/1882_2.png) [@darzu](https://forum.makecode.com/u/darzu)\
**Post date:** [December 31, 2020, 7:02pm UTC](https://forum.makecode.com/t/radio-compatibility-between-v1-and-v2/5284/2 "2020-12-31T19:02:29Z")

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Radio communication between v1 and v2 should work. Would you mind sharing the program or snippet that doesn’t work?

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**Author:** ![FabFru](https://avatars.discourse-cdn.com/v4/letter/f/ac8455/32.png) [@FabFru](https://forum.makecode.com/u/FabFru)\
**Post date:** [December 31, 2020, 7:35pm UTC](https://forum.makecode.com/t/radio-compatibility-between-v1-and-v2/5284/3 "2020-12-31T19:35:45Z")

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This is the code for V1: [https://makecode.microbit.org/\_C627exRFy2Pb](https://makecode.microbit.org/_C627exRFy2Pb)

and this is the code I am using for V2: [https://makecode.microbit.org/\_Aj1asYEytaYy](https://makecode.microbit.org/_Aj1asYEytaYy)

thankyou 😉

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**Author:** ![darzu](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.makecode.com/darzu/32/1882_2.png) [@darzu](https://forum.makecode.com/u/darzu)\
**Post date:** [December 31, 2020, 7:40pm UTC](https://forum.makecode.com/t/radio-compatibility-between-v1-and-v2/5284/4 "2020-12-31T19:40:33Z")

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If you add a “radio set group \_” block with the same number to each program in the “on start”, does it then work?

By default, programs with radio communication are set to a special group based on the exact program blocks, so only identical programs can talk to each other if you don’t use “radio set group \_” explicitly. This is to prevent a classroom with many different programs from interfering with each other.

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**Author:** ![FabFru](https://avatars.discourse-cdn.com/v4/letter/f/ac8455/32.png) [@FabFru](https://forum.makecode.com/u/FabFru)\
**Post date:** [January 1, 2021, 4:52pm UTC](https://forum.makecode.com/t/radio-compatibility-between-v1-and-v2/5284/5 "2021-01-01T16:52:09Z")

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Thank you

“radio set group \_” solved the problem

All the best and a Happy new year.