# Enviro:bit LEDs don't appear to light up **URL:** \ **Category:** BBC Micro:Bit\ **Created:** [December 22, 2019, 9:41pm UTC](https://forums.pimoroni.com/t/enviro-bit-leds-dont-appear-to-light-up/12512 "2019-12-22T21:41:12Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![aidancuckoo](https://avatars.discourse-cdn.com/v4/letter/a/ac8455/32.png) [@aidancuckoo](https://forums.pimoroni.com/u/aidancuckoo)\ **Post date:** [December 22, 2019, 9:41pm UTC](https://forums.pimoroni.com/t/enviro-bit-leds-dont-appear-to-light-up/12512/1 "2019-12-22T21:41:12Z")
For some reason, the enviro:bit LEDs don’t seem to light up. Any idea why? ---
**Author:** ![alphanumeric](https://sea2.discourse-cdn.com/flex016/user_avatar/forums.pimoroni.com/alphanumeric/32/2729_2.png) [@alphanumeric](https://forums.pimoroni.com/u/alphanumeric)\ **Post date:** [December 23, 2019, 9:44am UTC](https://forums.pimoroni.com/t/enviro-bit-leds-dont-appear-to-light-up/12512/2 "2019-12-23T09:44:23Z")
Is that with the test code? ---
**Author:** ![alphanumeric](https://sea2.discourse-cdn.com/flex016/user_avatar/forums.pimoroni.com/alphanumeric/32/2729_2.png) [@alphanumeric](https://forums.pimoroni.com/u/alphanumeric)\ **Post date:** [December 24, 2019, 9:04am UTC](https://forums.pimoroni.com/t/enviro-bit-leds-dont-appear-to-light-up/12512/4 "2019-12-24T09:04:34Z")
You have to program your Micro-Bit to make the Enviro-Bit work. I was assuming you had done that and were running something on the Microbit. The test code I was referring to is here. > **[pimoroni/pxt-envirobit](https://github.com/pimoroni/pxt-envirobit)** > > pxt-microbit package for the Pimoroni enviro:bit. Contribute to pimoroni/pxt-envirobit development by creating an account on GitHub. There are examples there on how to use the different sensors etc. And code to turn those LED’s on or off.