Are two circuits I designed with the propeller chip that both use rgb leds to do both emission of light, and detection of light.
The names were chosen due to the shape of the leds along with the concept Forrest Mims made popular, led detection.
Running program: Redwars.
The first design, MimsMirrorZero is a circular shape with 8 rgb leds in circular formation around a prop.
On the rear of the pcb is a crystal, eeprom, caps. Each output has a 100ohm resistor in series with one of the leds, or the common.
The commons also route to the prop, thus 4 legs x 8 leds = 32 input/output to leds.
No multiplexing was done intentionally due to desire for quick detection response times.
Every prop output is used in MimsMirrorZero for leds.
Please see attached video for demonstration.
If your video is black, change the quality, and rewind to beginning.
Zero is almost exactly the same size in diameter as a quarter.
The program the props are running in the video only turns on 1 led per step. I only run a single cog, and turn each lead on and then off sequentially.
The duration of each led's on time is set in the program. I step through each led in a roation turning each led on and then off.
My peak measurement in current draw was pathetic, 8ma peak. But this measures draw outside the inrush limiters, not between the prop and cap.
Average peak draw was 7ma for this video. Most any leg could push was through 200ohm (100ohm on led, and 100ohm on common)
16.5ma peak, not even including vf of leds. (3.0vf for blue and green, 2.1vf for red) 2.1vf red = 12ma 3.0vf blue/green = 3ma.
So it seems thats why im seeing 7ma average peak draw.
What happens if I tweak the resistors to the limits of the cree leds.. do I need sunglasses?
Zero's Parts List:
1-5mhz smt crystal- http://www.digikey.com/product-detail/en/NX8045GB-5MHZ-STD-CSF-3/644-1202-1-ND/3894081
35-100ohm- 0603 resistors. (more if other configs used) http://www.digikey.com/product-detail/en/ERJ-3GEYJ101V/P100GTR-ND/135659
2- 10k- 0603 resistors.(more if other configs used) http://www.digikey.com/product-detail/en/ERJ-3GEYJ103V/P10KGTR-ND/135662
4- 1uf- 0603 capacitors - http://www.digikey.com/product-detail/en/CC0603ZRY5V7BB105/311-1372-2-ND/2103110
(I used 4 - 68uf- 0603 polar caps $$$- http://www.digikey.com/product-detail/en/F980G686MMA/478-8636-1-ND/4006125
8- Cree RGB smt leds - http://www.digikey.com/product-detail/en/CLVBA-FKA-CC1F1L1BB7R3R3/CLVBA-FKA-CC1F1L1BB7R3R3CT-ND/2650499
2- 2 ohm 0603 power supply resistors - (inrush limiter) http://www.digikey.com/product-detail/en/ESR03EZPJ2R0/RHM2DTR-ND/4051230
The inrush limiters are only used when using high uf smt capacitors and should really be around 2 ohm or so?. I used 1/2 because its all I had around.
These LEDS require a very very low soldering temperature.
Full documentation will be edited in here as I produce it, code, schematics, images, etc...
(this area is reserved for MimsMirrorOne, which will be populated in 1 week.)
The connection layout of both Zero and One follows proper design so that parallel programming(see link) and communication can be done with any number of MimsMirror Zero's and One's. link:= http://forums.parallax.com/showthread.php/127983-55-Parallax-Propeller-s-Parallells-Processing-of-Permanent-Perturbations
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