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### Topic: Making a movie prop, but need some guidance (Read 5678 times)previous topic - next topic

#### EngineerJakit

##### Aug 28, 2013, 06:08 am
Wow, it has been some time since ive been to this part of the internet.

Ok, so recently I have decided to try and make videos to (hopefully) earn some income. I'm still building a fanbase, so i figured i would try to make something eyecatching for some potential subscribers. After some thought, i came up with a minimalist prop armor idea. As shown by the image in the attachment, its mainly a shoulder part and a modified glove. Tech-wise, the jewel on the shoulder part has a few blue LEDs with 3-4 pressure switches under it. The light on the glove is a 4-pin 7-color LED.

The 4-pin LED is always lit and changes color at a somewhat slow rate. The shoulder jewel acts as a button, which when all the switches behind it are pressed, turn the LEDs on and off. If one of the switches isn't being pressed, then the light doesn't change. The wiring should be simple to understand for me, but i'm not that good at using the Arduino yet. If this sounds easy, which i bet it does, does anyone mind giving me a hand?

#1
##### Aug 28, 2013, 06:59 am
You don't need an Uno for that - the smaller  5V, 16 MHz ProMini will be sufficient, and use less power too. Run from 3 AA battery, 4.5V connected to Gnd & VCC pin.
(I'd  say 3V/8MHz, but 3V may insufficient to light the Blue LED).
Hardware wise is simple - common anode RGB LED, 3 resistors. Anode goes to VCC, Resistors go between cathodes and PWM pin 3,5,6.
This one will be nice & bright!
http://www.dipmicro.com/store/LED10AC
Red - 2V  resistor = (4.5V - 2V)/.02 = 125 ohm
Green - 3.2V resistor = (4.5V - 3.2V)/.02 = 65 ohm
Blue - 3.1V resistor = (4.5V - 3.1V)/.02 = 70 ohm

Do simiilar math for the other LEDs you select.

Do some ordering, some building, come back for coding help.
Designing & building electrical circuits for over 25 years.  Screw Shield for Mega/Due/Uno,  Bobuino with ATMega1284P, & other '328P & '1284P creations & offerings at  my website.

#### EngineerJakit

#2
##### Aug 28, 2013, 03:09 pm

You don't need an Uno for that - the smaller  5V, 16 MHz ProMini will be sufficient, and use less power too. Run from 3 AA battery, 4.5V connected to Gnd & VCC pin.
(I'd  say 3V/8MHz, but 3V may insufficient to light the Blue LED).
Hardware wise is simple - common anode RGB LED, 3 resistors. Anode goes to VCC, Resistors go between cathodes and PWM pin 3,5,6.
This one will be nice & bright!
http://www.dipmicro.com/store/LED10AC
Red - 2V  resistor = (4.5V - 2V)/.02 = 125 ohm
Green - 3.2V resistor = (4.5V - 3.2V)/.02 = 65 ohm
Blue - 3.1V resistor = (4.5V - 3.1V)/.02 = 70 ohm

Do simiilar math for the other LEDs you select.

Do some ordering, some building, come back for coding help.

Given that im probably going to use the prop at least once for this short movie, i should still be able to work with the Uno, yeah? I'll be able to get a ProMini sometime after.