LEDzep – LED there be light !


Today was a test day, i spent a good part of the afternoon trying to solder wires to SMD LEDs, and trust me it wasn’t easy, as the only wire a could get was way larger than the pads I had to solder it on, as you can see



Fortunately, after a lot of tries and errors (and a few burnt connectors and fingers), I managed to get a few tests and they were rather conclusive ! I made a small space to test, with a lot of LEDs, and it looked rather nice 😀


As you can see in the pictures (the red one was this LED , and the green 1 was with one and then 3 of these LEDs)

IMG_20140309_204111IMG_20140309_204019 IMG_20140309_205338

This helped me to get a grasp of what Candela (cd) means on a LED, and how much we will need.

Thomas did also a great work this afternoon and made the plans of the base of our balloons (where we will put the motors, battery and pcb), here is what it looked liked once printed on the robotics club 3D printer



And that’s it for today.


Félix Raimundo


6 comments to LEDzep – LED there be light !

  • Cool, how heavy is it?

    • Félix Raimundo

      I do not have a balance close to me, but i’d say that it isn’t heavier than 5g 😀

      Since we are likely to choose balloons with a 30-40cm radius filled with Helium (the latex of the balloon weights about 30g) we will be able to lift a payload between 86g and 245g, so this is rather small.

      But I have to admit that using PLA which is extremely solid for its density, is a huge plus !

  • Woaw, that’s way more than I imagined, you could almost embed a water gun!

    • Félix Raimundo

      I’m not sure for a water gun, but we thought of adding proximity sensors and a buzzer, this way we will be able to do both lights and sound (“son et lumière” as the french would say 😉 ).

  • Cool!
    But you need a remote haptic feedback too, water is the simplest solution.
    Wind would work:
    …but it’s not as fun.
    OK, I stop here 😉

    • Félix Raimundo

      If my calculations are correct (and I hope they are ^^), there will still be about 100-150g of free payload if you choose to fill the balloons to their maximum capacity (~45cm of radius). And since we intend to leave some micromatch in order to connect to the free I2C or SPI (I haven’t checked yet, but since we use very few pins i’m pretty sure there we will be some available) you could add this functionality if you want 😉