Hi Alex, never heard of Jaycar sounds a bit like Maplins we have here.
Was it difficult rigging up the LEDs? might be something for me to try on the Strada when I start to strip it down, the backlighting is very poor.
Jaycar quotes prices on their website in GBP, so I think they've opened a shop in London (it was going to happen for some time). It's an Australian outfit.
The colour-cycling LEDs were very difficult to get working right. First, I referred to the datasheet available from the website, and I calculated the resistor value (R = V / I) with V = 12 - 2.13 (forward voltage required), and I = 0.023 (forward current required, 23mA). That blew up the first LED.
The forward voltage drop varies slightly for each colour, so a one-size-fits-all resistor didn't seem to be possible for 12V. I could get the red, the green, and the blue, but the next three colours are supposed to be red+green, green+blue, and red+blue - I got red, green+blue, and red... the final colour is 'white' (red+green+blue) and again I would just get red. Increasing the resistor value (to dim-down the LED as desired) would just stop the colour cycling completely; I would only get red!
So the final solution involved wiring two red LEDs and a 300 Ohm resistor in series with the colour-changing LED (series wiring brings the voltage down), and then wiring the second colour-changing LED in parallel with the first. This is a lot more complicated than normally necessary: the white LEDs, for example, just have a 1k Ohm resistor in series with each one, and most other LEDs require a 300 - 560 Ohm resistor in series.
I had to wrap the colour-changing LEDs in white insulation tape, to reduce their intensity. You might wonder why, based on the video, but remember that is a camera - in real life, the switch legends lit up the car otherwise!
If you are putting LEDs behind the crystal-clear lights/wipers legends on the Uno, you're generally better off with normal-intensity (i.e. diffuse coloured) LEDs; otherwise the black background starts to glow! High intensity works better for the square push-switches which are quite diffusive by the white material used. In my experience anyway - I've done four Unos now!
Be aware that white and blue LEDs are special cases - if you decide to use these, be prepared to experiment with resistor values (and buy a few spare LEDs). Green, yellow, and red LEDs are a fraction of the price and much more tolerant of current and voltage.
Basically, you need a handful of 560 Ohm resistors (a few pence each?) and five LEDs (for a standard Uno), plus some spare speaker wiring etc. and some heatshrink tube (two sizes, one to fit over the LED leads, and one to fit over the LEDs themselves). This makes the LEDs a press-fit into the switch housings, which are designed to accept the fibre-optic end fittings standard on the Turbo and 70SL (and probably used on the Abarth 130TC as well
)
-Alex