CHDK project [1] early on used to dump flashes of Canon cameras through their LEDs [2].<p>[1]: <a href="http:&#x2F;&#x2F;chdk.wikia.com&#x2F;wiki&#x2F;CHDK" rel="nofollow">http:&#x2F;&#x2F;chdk.wikia.com&#x2F;wiki&#x2F;CHDK</a><p>[2]: <a href="http:&#x2F;&#x2F;chdk.wikia.com&#x2F;wiki&#x2F;Obtaining_a_firmware_dump#Hardware-software_solution" rel="nofollow">http:&#x2F;&#x2F;chdk.wikia.com&#x2F;wiki&#x2F;Obtaining_a_firmware_dump#Hardwar...</a>