Tiny LED Jack-O'-Lantern

Step 3 LED Module Materials

Let's build an LED module to light your pumpkin. For this, I'm going to use the following:

• One (1) ultra-bright red LED (2.4 V, 20 mA)**
• One (1) 33-ohm resistor
• One (1) SPST switch***
• Two (2) AA batteries
• One (1) snap connector (typically used for 9V batteries)
• A four AA battery holder

** This particular red LED provides 5000 mcd of luminous intensity, which is enough for small pumpkins.

*** You'll notice that later in the video I am actually using a DPDT switch. I had a lot of those, but I only had a few SPSTs.