Monthly Archives: August 2016

Flashbar for festival using sACN over WiFi with ESP8266

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IMG_7393
This flashbar, aka blinder, was used under a concert to give a blinding effect for the audience.

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A mosfet driver is enabling the LED’s. The LED’s is 10W element, and there is 8 elements on the flashbar giving 80W of power.
It’s powered from an PC power supply.

The ESP8226 is running a small UDP server and listens for sACN packets. sACN is like DMX512, but over UDP instead of RS-485.
You can find the firmware here https://github.com/TimGremalm/FlashBar.

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The LED’s are screwed down on top of a steel bar to transfer the heat.

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Festivalljus – LED, Lens, Heatsink Assembly

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Assembly Spotlight With Chassi 3D 1
One of the hardest things with this project is to solve the problem with the heating. 9 pieces of 3W LED tends to get very hot, 27W that have to be transferred to the air.

LED 3DLED Inverted 3D
If I bend the pins on the led I can make the LED’s go through the PCB. An alternative is to use a lot of small via’s under the LED to transfer the heat to the underside. But I think a direct contact with the heatsink will be more effective.

Assembly PCB with LEDs 3D Without Lens
Assembly PCB with LEDs BottomAssembly PCB with LEDs 3DAssembly PCB with LEDs SideAssembly PCB with LEDs Top

Assembly PCB with LEDs 3D With Heatsink Fan
Assembly PCB with LEDs 3D With Heatsink LensesAssembly PCB with LEDs 3D With Heatsink Side
A CPU cooler should be sufficient enough to transfer the heat out to the air. I don’t know if the fan is necessary.

The whole assembly will look something like this:
Assembly Spotlight With Chassi 3D 2Assembly Spotlight With Chassi 3D 3Assembly Spotlight With Chassi 3D 4

Optics Specification