Robot Lighting

[Meshbeard]

Our team is looking into putting some lighting on our robot next year. If any teams that have previously done so would like to offer some advice, it would be much appreciated.

I know team 118's robot had some nice lighting this year, and team 148 always has underglow on their robot.

[davepowers]

It all depends how in depth you want the lighting to be. I know 118 used their lighting to signal their and other drivers of various things. This year we toyed with using our LED lighting to alert our drive team when we had balls in our elevator. You can use Audrino boards to make some pretty cool custom features. I'm not an expert on that stuff, but if you're really interested I'm sure someone on here can charm in.

As far as the lights themselves go, you have three choices, a static color and strip, RGB LEDS, and Addressable RGB LEDS. This year we stuck with a static white color just to give a little extra aesthetic appeal to our bot. In previous years, we've used RGB LEDS with success.

Purchasing and installing the lights after choosing which lights and features you're shooting for is the easy part. Many cheap LED strips, static, RGB, and Addressable can be found here.

From there the sky is the limit, here's a picture of GUS' 2012 competition robot.

-D

[mikets]

This year, our team used LED lights to:
- indicate whether the target is to the left, to the right or just right. This is so that the drivers don't have to look at the laptop screen for the video stream.
- indicate the shooter speed is within tolerance of the target speed, so the drivers can shoot consistently.
- indicate various teleop modes (e.g. fully automatic, semi automatic and full manual).

Our LED lights strips are connected to the solenoid module and we have written a generic light control module that allows the caller to either turn the light solid ON or OFF, or specifies any blinking patterns (e.g. 3 long blinks, 2 short blinks and repeat the pattern etc.). The module even supports RGB so it can specify what color combinations in the blinking pattern. In theory, we could even do pulse width modulation on the RGB lights to get many colors but we haven't tested if it actually works.

[Meshbeard]

Thank you for the information! Is electroluminescent wire at all feasible?

Regarding the Arduino, would the Arduino just be powered out of the PD board? Is that legal?

What is the benefit of using the solenoid module as opposed to the relay outputs on the digital sidecar?

[mikets]

Originally Posted by Meshbeard

Thank you for the information! Is electroluminescent wire at all feasible?

I am not familiar with the power interface of electroluminescent wire but it seems it is powered by high AC voltage (90-120V 1000Hz) so it needs a power controller. If you manage to interface 12V DC to this power controller, it may be feasible. Searching the Internet, it looks like they sell these with a power controller that can take AAA batteries. So in theory, you could DC-DC convert 12V to whatever battery voltage the power controller uses.

Originally Posted by Meshbeard

What is the benefit of using the solenoid module as opposed to the relay outputs on the digital sidecar?

Relay is mechanical, since we are trying to play with pulse width modulation on the RGB lights, relay has a limit of how fast you can turn the light on and off. BTW, in case you worry about whether the solenoid channel can power the LED lights, each solenoid channel can source up to 0.75A current, an LED light strip generally consumes about 100mA.

[AlDee]

Originally Posted by mikets

I am not familiar with the power interface of electroluminescent wire but it seems it is powered by high AC voltage (90-120V 1000Hz) so it needs a power controller. If you manage to interface 12V DC to this power controller, it may be feasible. Searching the Internet, it looks like they sell these with a power controller that can take AAA batteries. So in theory, you could DC-DC convert 12V to whatever battery voltage the power controller uses.

Relay is mechanical, since we are trying to play with pulse width modulation on the RGB lights, relay has a limit of how fast you can turn the light on and off. BTW, in case you worry about whether the solenoid channel can power the LED lights, each solenoid channel can source up to 0.75A current, an LED light strip generally consumes about 100mA.

I'm sure these can be made to run off 12V, My question is are they FRC legal since they generate high voltage internally? I have the same question about neon light strips.

[Al Skierkiewicz]

Neon tubes have been allowed with a DC-DC high voltage convertor, but must meet all electrical rules and then be inspected. Insulation and safety are the prime issues but leaving broken glass on the field is another. If you can't satisfy all of these concerns, it is better to use the weight for something that plays the game.
The high voltage from one of these convertors is not likely to kill anyone but it does give the gift that keeps on giving as we say in electrical circles. Burns, localized nerve damage and scars are common.

[Al Skierkiewicz]

Originally Posted by Meshbeard

Thank you for the information! Is electroluminescent wire at all feasible?

That depends, some products actually need a high voltage module to turn them on. This would come under the custom circuit rules and for obvious reasons would be looked at very carefully from a safety standpoint.

Some of yo on Newton may have noticed that WildStang finally mounted it's LED strings at Champs again this year. What you may not know is that several different feedback schemes were programmed into the string. In addition to sound controlled lighting, there were other driver feedback patterns included as well. Mentors and students are in the process of writing up the system to provide to the First community. Please be patient, they are shooting for IRI at the latest.

[taichichuan]

We used an Arduino Mega with an Ethernet shield this year for the RPM on the shooter and the angle of our ball launch. Using the Ethernet wasn't too hard. But, the cRio had something odd in the robot code where if you started sending packets, but there was nothing actively reading them, that the robot would eventually go offline. We were using UDP on the local link as a directed unicast to keep packets from going across the link to the driver station.

It's definitely related to the robot code because I've been using VxWorks for over 25 years and I've never encountered anything like this failure in the main OS. Nonetheless, if you have a thread reading the packets all of the time, then everything works well. I'll be doing some tests as soon as I get access to a cRio again to see how much data the cRio can absorb via the Ethernet during normal operation before the driver station packets start getting dropped.

[kevinle]

I found the same lpd8806 individually addressable rgb strips for 117 bucks. A full tutorial on the strip and some code, pretty good for those who haven't come across it yet: http://www.ladyada.net/products/digi...rip/index.html

First thing I suggest you do is load that library, pull up the strand test example and load it onto your teensy then have some fun with it.

[apples000]

During the offseason, our team has made a neat light controller for two independent colors of RGB LED lights. We used our own PCB with a MAX232 IC to connect the cRIO serial port to the serial connection of a ATMega328 microcontroller(The one found in newer ardruinos). The ATMega328 would receive a color command from the cRIO and it would use its 6 pwms to switch the transistors for the common anode LED's. It makes a great project and it only requires 24 components so routing the PCB was really easy. If anybody is interested, I can post an eagle board and schematic, as well as our labview code and the code we used on the atmega. The atmega has the arduino bootloader so it can be programmed through the arduino enviornment.

[Miqi]

Also, this exists.
http://www.lighttape.com/
It's what they used in Tron Legacy.

[taichichuan]

We've had good luck with using Arduinos and RGB addressable LED tape like this stuff:

http://www.adafruit.com/products/306

The Arduino can only source 40ma on one digital out. So, you'll likely have to create your own power transistor circuit if you want to trigger more than a simple LED.

Good luck and enjoy the lights!

[gracie.]

I have a little too much fun with lighting. We typically use cold cathodes, they're easy to attach and are great for underglow. They're REALLY bright. I didn't get to during competition, but I put some in our conveyor system and they look great!!! (I'll see if I can find a picture) This year, as a new thing we used el wire. That also worked really well. It's not quite as obviously bright as cathodes, though I'm sure it would be more noticeable if you bunched it up. We used it to trace designs on the shielding for the electrical board. It was also very easy to attach and wire.

Team 2016 used lighting in the shape of the FIRST logo elements last year. They were separately illuminated, allowing the human player to know which tube to feed, and all of them lit up when the robot acquired a tube.

We've also had some blue lighting on our robot since Breakaway. Must say... our robot's blue glow looked really nice next to 148's red at the 2010 Dallas Regional.