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sciBot LED

The yellow RCA jack has an outer shield that is connected to ground, and a centre pin that is connected to the sciBot’s analog or digital inputs.

If you connect a sciBot LED to a red RCA jack, it will be powered by 5V, and will stay on while the sciBot is powered.




Image Quantity Description Manufacturer Vendor
Audio Video Cable with RCA Plugs (0.9 m)
Chateau 777-36G Dollar Tree
1 White LED Inolux INL-5AW30 DigiKey 1830-1013-ND
1 Resistor (1k, 1%, 1/4W) Stackpole Electronics RNMF14FTC1K00 DigiKey S1KCATR-ND
1 1/4″ (6.3 mm) 3:1 adhesive heat shrink, cut to 40 mm Qualtek Q5-3X-1/4-01-QB48IN-25 DigiKey Q53X014B-ND
1 1/16″ (1.6 mm) 3:1 heat shrink, cut to 10 mm Qualtek Q2-F3X-1/16-01-QB48IN-25 DigiKey Q2F3X116B-ND


If you want a different colour LED, you can try any of the following:

Description Manufacturer Vendor
Blue LED Cree C503B-BCS-CV0Z0461 DigiKey C503B-BCS-CV0Z0461-ND
Green LED Würth Elektronik 151053GS03000 DigiKey 732-5020-ND
Cyan LED Kingbright WP7113VRCBC/A DigiKey 754-2183-ND




Step 1

Cut the resistor’s legs so that there is about 3 mm of leg remaining on either side.

Tin the legs.

Step 2

Cut the longer leg (positive) of the LED so that only about 5 mm remains.

Tin the shortened leg.

Step 3

Solder the resistor to the short leg of the LED.

Step 4

Cut the other leg of the LED so that it is about 5 mm long.

Tin the leg.

Step 5

On the audio video cable, identify the two strain reliefs. They are black blocks of plastic that prevent the wires from being pulled apart.

One of the strain reliefs is visible in the bottom-left corner of the picture to the right.

Step 6

Remove the strain reliefs using shear cutters.

Step 7

Pull the yellow cable to separate it from the red and white cables.

Step 8

Cut the yellow cable in half.

Step 9

Remove about 20 mm of insulation from the cable.

Step 10

Cut about 10 mm from the yellow wire.

Strip about 3 mm of insulation from the inner yellow and black wires.

Step 11

Tin the exposed copper.

Step 12

Put the small heat shrink over the black wire.

Step 13

Solder the black wire to the tinned LED leg.

Solder the yellow wire to the tinned resistor leg.

Step 14

Put the small piece of heat shrink over the solder joint and heat.

Step 15


Put the large heat shrink over the entire joint, including half of the LED, and heat.

Congratulations! You have completed making the sciBot LED.