Asked — Edited

How To Wire Up Rad Leds

How should I wire up the leds on my rad? can I PLUG THEM IN RIGHT ONTO THe board? or can I wire them together? how have other people did it?


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United Kingdom
#1  

I wired mine so each is on it's own port. They can connect straight to the EZ-B, no resistor is needed. Between Signal and Ground. Set Digital to turn on and off. Use scripts for sequences i.e. Larson scanner

#2  

ok. they are are ok to run off of 5v? And could I wire them all together on one port? e.g. all red visor leds on one port, eyes on another.

United Kingdom
#3  

The signal wire doesn't supply much current, from memory I think it's 25mA. It's enough to power one and 5V is no problem at all. Powering all 4 would mean each gets 6.25mA which I'd guess isn't enough. You could use a TIP122 circuit.

The headlights either side I tried quickly direct to the EZ-B but nothing happened. It could have been my wiring though but I suspect it was the signal wire not providing enough power. A TIP122 circuit may work but I don't know if 5V is a safe voltage or not.

#4  

You may consider a 1k resistor between your 5v output and the LEDs just to knock it down a bit. There also is a adjustable voltage regulator that you can use and just adjust it to the voltage you want. Many of my friends use reastat / variable resistors to cut down current to what they need for the LEDs. Lastly there's the step down converters that work great for this kind of thing too.

Edit - if you want to connect the positive to signal and neg to ground that's fine. The only downside is each led takes up a port. The short leg on a led is the neg, long is positive. https://www.youtube.com/watch?v=XzhVm3WWyy0&feature=youtube_gdata_player

#5  

do we know what voltage the leds in the rad are? if so that will help. could I wire 2 leds together? 2 and 2 to do the visor. then use another battery pack and a manual switch for eye/headlight leds?

United Kingdom
#6  

Replace the LEDs and you may be able to find some that would work together, or juse a TIP122 circuit to power all 4 as mentioned previously. The TIP122 circuit is probably the best option IMO.

Alternately you could build a new circuit for the head using an I2C extender and control everything individually through the I2CWrite commands, using up 0 digital ports.