# fastLED library not working on photon **URL:** \ **Category:** Libraries\ **Created:** [June 14, 2017, 9:02pm UTC](https://community.particle.io/t/fastled-library-not-working-on-photon/33753 "2017-06-14T21:02:15Z")\ **Posts on this page:** 8\ **Page:** 1
**Author:** ![kkwak](https://avatars.discourse-cdn.com/v4/letter/k/258eb7/32.png) [@kkwak](https://community.particle.io/u/kkwak)\ **Post date:** [June 14, 2017, 9:02pm UTC](https://community.particle.io/t/fastled-library-not-working-on-photon/33753/1 "2017-06-14T21:02:15Z")
![](https://us1.discourse-cdn.com/flex026/uploads/particle/original/2X/4/444df62007a831e3832a04fa71eacdc6208cd968.jpg) #Here is code I’m using: ```cpp //================================================ #include "FastLED.h" #define LED_COUNT 15 #define LED_PIN 12 struct CRGB leds[LED_COUNT]; //================================================ uint8_t hue = 32; byte idex = 255; byte meteorLength = 29; void setup() { // sanity check delay - allows reprogramming if accidently blowing power w/leds delay(2000); LEDS.addLeds(leds, LED_COUNT); LEDS.setBrightness(200); } void loop(){ meteorShower(); } void meteorShower(){ // slide all the pixels down one in the array memmove8( &leds[1], &leds[0], (LED_COUNT - 1) * 3 ); // increment the meteor display frame idex++; // make sure we don't drift into space if ( idex > meteorLength ) { idex = 0; // cycle through hues in each successive meteor tail hue += 32; } // this switch controls the actual meteor animation, i.e., what gets placed in the // first position and then subsequently gets moved down the strip by the memmove above switch ( idex ) { case 0: leds[0] = CRGB(200,200,200); break; case 1: leds[0] = CHSV((hue - 20), 255, 210); break; case 2: leds[0] = CHSV((hue - 22), 255, 180); break; case 3: leds[0] = CHSV((hue - 23), 255, 150); break; case 4: leds[0] = CHSV((hue - 24), 255, 110); break; case 5: leds[0] = CHSV((hue - 25), 255, 90); break; case 6: leds[0] = CHSV((hue - 26), 160, 60); break; case 7: leds[0] = CHSV((hue - 27), 140, 40); break; case 8: leds[0] = CHSV((hue - 28), 120, 20); break; case 9: leds[0] = CHSV((hue - 29), 100, 20); break; default: leds[0] = CRGB::Black; } // show the blinky FastLED.show(); // control the animation speed/frame rate delay(30); } ``` #Here is the error I get when verifying: ```nohighlight Processing meteorshower.ino Checking library FastLED... Checking library FastLED2... Checking library neopixel... Installing library neopixel 0.0.13 to lib/neopixel ... Library neopixel 0.0.13 installed. Installing library FastLED2 3.1.8 to lib/FastLED2 ... Library FastLED2 3.1.8 installed. Installing library FastLED 3.1.5 to lib/FastLED ... Library FastLED 3.1.5 installed. make -C ../modules/photon/user-part all make[1]: Entering directory '/firmware/modules/photon/user-part' make -C ../../../user make[2]: Entering directory '/firmware/user' Building cpp file: src/meteorshower.cpp Invoking: ARM GCC CPP Compiler mkdir -p ../build/target/user/platform-6-msrc/ arm-none-eabi-gcc -DSTM32_DEVICE -DSTM32F2XX -DPLATFORM_THREADING=1 -DPLATFORM_ID=6 -DPLATFORM_NAME=photon -DUSBD_VID_SPARK=0x2B04 -DUSBD_PID_DFU=0xD006 -DUSBD_PID_CDC=0xC006 -DSPARK_PLATFORM -g3 -gdwarf-2 -Os -mcpu=cortex-m3 -mthumb -DINCLUDE_PLATFORM=1 -DPRODUCT_ID=6 -DPRODUCT_FIRMWARE_VERSION=65535 -DUSE_STDPERIPH_DRIVER -DDFU_BUILD_ENABLE -DSYSTEM_VERSION_STRING=0.6.2 -DRELEASE_BUILD -I./inc -I../wiring/inc -I../system/inc -I../services/inc -I../communication/src -I../hal/inc -I../hal/shared -I../hal/src/photon -I../hal/src/stm32f2xx -I../hal/src/stm32 -I../hal/src/photon/api -I../platform/shared/inc -I../platform/MCU/STM32F2xx/STM32_USB_Host_Driver/inc -I../platform/MCU/STM32F2xx/STM32_StdPeriph_Driver/inc -I../platform/MCU/STM32F2xx/STM32_USB_OTG_Driver/inc -I../platform/MCU/STM32F2xx/STM32_USB_Device_Driver/inc -I../platform/MCU/STM32F2xx/SPARK_Firmware_Driver/inc -I../platform/MCU/shared/STM32/inc -I../platform/MCU/STM32F2xx/CMSIS/Include -I../platform/MCU/STM32F2xx/CMSIS/Device/ST/Include -I../dynalib/inc -Isrc -I./libraries -Isrc -Isrc -Isrc -Isrc -Ilib/FastLED/src -Ilib/FastLED2/src -Ilib/neopixel/src -I. -MD -MP -MF ../build/target/user/platform-6-msrc/meteorshower.o.d -ffunction-sections -fdata-sections -Wall -Wno-switch -Wno-error=deprecated-declarations -fmessage-length=0 -fno-strict-aliasing -DSPARK=1 -DPARTICLE=1 -DSTART_DFU_FLASHER_SERIAL_SPEED=14400 -DSTART_YMODEM_FLASHER_SERIAL_SPEED=28800 -DSPARK_PLATFORM_NET=BCM9WCDUSI09 -fno-builtin-malloc -fno-builtin-free -fno-builtin-realloc -DLOG_INCLUDE_SOURCE_INFO=1 -DPARTICLE_USER_MODULE -DUSE_THREADING=0 -DUSE_SPI=SPI -DUSE_CS=A2 -DUSE_SPI=SPI -DUSE_CS=A2 -DUSE_THREADING=0 -DUSER_FIRMWARE_IMAGE_SIZE=0x20000 -DUSER_FIRMWARE_IMAGE_LOCATION=0x80A0000 -DMODULAR_FIRMWARE=1 -DMODULE_VERSION=4 -DMODULE_FUNCTION=5 -DMODULE_INDEX=1 -DMODULE_DEPENDENCY=4,2,108 -D_WINSOCK_H -D_GNU_SOURCE -DLOG_MODULE_CATEGORY="\"app\"" -fno-exceptions -fno-rtti -fcheck-new -std=gnu++11 -c -o ../build/target/user/platform-6-msrc/meteorshower.o src/meteorshower.cpp In file included from meteorshower.ino:15:0: lib/FastLED/src/FastLED.h:12:2: warning: #warning FastLED version 3001000 (Not really a warning, just telling you here.) [-Wcpp] #warning FastLED version 3001000 (Not really a warning, just telling you here.) ^ meteorshower.ino:5:27: error: elements of array 'CRGB leds [15]' have incomplete type meteorshower.ino:5:27: error: storage size of 'leds' isn't known In file included from meteorshower.ino:15:0: meteorshower.ino: In function 'void setup()': lib/FastLED/src/FastLED.h:457:14: error: 'FastLED' was not declared in this scope #define LEDS FastLED ^ meteorshower.ino:25:3: note: in expansion of macro 'LEDS' lib/FastLED/src/FastLED.h:457:14: note: suggested alternative: #define LEDS FastLED ^ meteorshower.ino:25:3: note: in expansion of macro 'LEDS' lib/FastLED/src/FastLED.h:460:17: note: 'NSFastLED::FastLED' extern CFastLED FastLED; ^ meteorshower.ino:25:16: error: 'WS2812' was not declared in this scope meteorshower.ino:25:16: note: suggested alternative: In file included from meteorshower.ino:15:0: lib/FastLED/src/FastLED.h:79:52: note: 'NSFastLED::WS2812' template class WS2812 : public WS2812Controller800Khz {}; ^ meteorshower.ino:25:33: error: 'GRB' was not declared in this scope meteorshower.ino:25:33: note: suggested alternative: In file included from lib/FastLED/src/controller.h:5:0, from lib/FastLED/src/FastLED.h:37, from meteorshower.ino:15: lib/FastLED/src/pixeltypes.h:810:2: note: 'GRB' GRB=0102, ^ meteorshower.ino: In function 'void loop()': meteorshower.ino:35:15: error: 'meteorShower' was not declared in this scope meteorshower.ino: In function 'void meteorShower()': meteorshower.ino:75:31: error: invalid use of incomplete type 'struct CRGB' meteorshower.ino:5:8: error: forward declaration of 'struct CRGB' meteorshower.ino:81:40: error: 'CHSV' was not declared in this scope meteorshower.ino:81:40: note: suggested alternative: In file included from lib/FastLED/src/controller.h:5:0, from lib/FastLED/src/FastLED.h:37, from meteorshower.ino:15: lib/FastLED/src/pixeltypes.h:18:8: note: 'NSFastLED::CHSV' struct CHSV { ^ meteorshower.ino:135:15: error: incomplete type 'CRGB' used in nested name specifier meteorshower.ino:143:3: error: 'FastLED' was not declared in this scope meteorshower.ino:143:3: note: suggested alternative: In file included from meteorshower.ino:15:0: lib/FastLED/src/FastLED.h:460:17: note: 'NSFastLED::FastLED' extern CFastLED FastLED; ^ ../build/module.mk:267: recipe for target '../build/target/user/platform-6-msrc/meteorshower.o' failed make[2]: Leaving directory '/firmware/user' make[2]: *** [../build/target/user/platform-6-msrc/meteorshower.o] Error 1 ../../../build/recurse.mk:11: recipe for target 'user' failed make[1]: Leaving directory '/firmware/modules/photon/user-part' make[1]: *** [user] Error 2 ../build/recurse.mk:11: recipe for target 'modules/photon/user-part' failed make: *** [modules/photon/user-part] Error 2 ``` ---
**Author:** ![ScruffR](https://sea2.discourse-cdn.com/flex026/user_avatar/community.particle.io/scruffr/32/6952_2.png) [@ScruffR](https://community.particle.io/u/ScruffR)\ **Post date:** [June 14, 2017, 9:45pm UTC](https://community.particle.io/t/fastled-library-not-working-on-photon/33753/2 "2017-06-14T21:45:19Z")
Just add this line after the include statement ```cpp FASTLED_USING_NAMESPACE ``` And please use `A2` instead of `12` for your `#define LED_PIN` ---
**Author:** ![kkwak](https://avatars.discourse-cdn.com/v4/letter/k/258eb7/32.png) [@kkwak](https://community.particle.io/u/kkwak)\ **Post date:** [June 14, 2017, 9:58pm UTC](https://community.particle.io/t/fastled-library-not-working-on-photon/33753/3 "2017-06-14T21:58:34Z")
THANK YOU! Ah yes, I changed those variables. LED\_COUNT is actually 144 and LED\_PIN is actually D1 ---
**Author:** ![KyleG](https://sea2.discourse-cdn.com/flex026/user_avatar/community.particle.io/kyleg/32/11077_2.png) [@KyleG](https://community.particle.io/u/KyleG)\ **Post date:** [June 16, 2017, 6:13pm UTC](https://community.particle.io/t/fastled-library-not-working-on-photon/33753/4 "2017-06-16T18:13:28Z")
Thanks for the help! ---
**Author:** ![RWB](https://sea2.discourse-cdn.com/flex026/user_avatar/community.particle.io/rwb/32/22599_2.png) [@RWB](https://community.particle.io/u/RWB)\ **Post date:** [June 16, 2017, 10:36pm UTC](https://community.particle.io/t/fastled-library-not-working-on-photon/33753/5 "2017-06-16T22:36:25Z")
@kkwak Here is a web page with code for quite a few different style of neo pixels display patterns that I ran across the other day. > **[Tweaking4All.com - Arduino - LEDStrip effects for NeoPixel and FastLED](https://www.tweaking4all.com/hardware/arduino/adruino-led-strip-effects/#diffuse_light)** > > In this article I'll show you a several LED strip effects for NeoPixel and FastLED. The code works for both libraries and any strip they support (theoretically). ---
**Author:** ![kkwak](https://avatars.discourse-cdn.com/v4/letter/k/258eb7/32.png) [@kkwak](https://community.particle.io/u/kkwak)\ **Post date:** [June 20, 2017, 5:18pm UTC](https://community.particle.io/t/fastled-library-not-working-on-photon/33753/6 "2017-06-20T17:18:36Z")
@RWB Thanks! I came across these too. Unfortunately I just bought a bunch of RGBW strips which the FastLED library doesn’t seem to work on. ---
**Author:** ![RWB](https://sea2.discourse-cdn.com/flex026/user_avatar/community.particle.io/rwb/32/22599_2.png) [@RWB](https://community.particle.io/u/RWB)\ **Post date:** [June 20, 2017, 6:12pm UTC](https://community.particle.io/t/fastled-library-not-working-on-photon/33753/7 "2017-06-20T18:12:42Z")
The code on that site works with the neopixels also, you just have to add their initial code to get the animations working. Took me a min to figure out. ---
**Author:** ![kkwak](https://avatars.discourse-cdn.com/v4/letter/k/258eb7/32.png) [@kkwak](https://community.particle.io/u/kkwak)\ **Post date:** [June 20, 2017, 11:39pm UTC](https://community.particle.io/t/fastled-library-not-working-on-photon/33753/8 "2017-06-20T23:39:22Z")
@RWB I know it works for RGB neopixels but I don’t think the FastLED library supports RGBW neopixel strips yet