Forum: Sensors
03-08-2016, 01:26
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Replies: 17
Views: 1,427
Re: Analog Devices
Hi everyone! I had an interesting question pop up on GitHub that I thought might be of interest here. I also provide a bit of information on what we achieve with factory calibration and what the...
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Forum: Sensors
07-05-2016, 14:21
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Replies: 17
Views: 1,427
Re: Analog Devices
That's right! Shameless plug, I just updated the IMU driver to drastically reduce CPU usage in LabVIEW! Let me know if anyone has issues with it!
https://github.com/juchong/ADIS16448-RoboRIO-Driver
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Forum: Sensors
03-05-2016, 00:11
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Replies: 17
Views: 1,427
Re: Analog Devices
Unfortunately, the module will not be sold to teams outside of FIRST Choice. The IMUs were donated by Analog Devices to FIRST, so FIRST owns the stock currently in FIRST Choice. That being said, I'm...
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Forum: Electrical
11-04-2016, 14:34
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Replies: 30
Views: 3,681
Re: Battery connected backwards to robot
While reverse polarity protection is usually overlooked since it's assumed that the user should never reverse the input polarity, it's good design practice to put some safeguards in place given that...
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Forum: Electrical
27-03-2016, 19:39
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Replies: 121
Views: 11,833
Re: COMM lost way to many times
Can you post a picture of your robot? I'm thinking it may have something to do with radio placement. Another theory is the radio could be damaged. Have you tried swapping it out for a spare?
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Forum: Electrical
24-03-2016, 18:20
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Replies: 31
Views: 3,425
Re: Com wire
In a pinch, you can take apart a CAT5e cable with stranded inner conductors and use it to daisy-chain your CAN devices. Alternatively, as cheap as the cable is from CTRE, AndyMark, etc. I would...
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Forum: CAN
24-03-2016, 17:09
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Replies: 1
Views: 717
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Forum: Electrical
24-03-2016, 14:58
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Replies: 121
Views: 11,833
Re: COMM lost way to many times
It looks like there's been a lot of discussion on the radio, breaker, connectors, etc. being the issue. I think the likely culprit here isn't the PDP, but rather the VRM.
At the NC Wake County...
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Forum: Electrical
24-03-2016, 14:33
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Replies: 8
Views: 1,494
Re: Batteries on AndyMark
I don't have any documented evidence on discharge rates, instantaneous current draw, internal resistance, etc. This is all purely empirical, but I have noticed that the MK batteries perform better...
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Forum: General Forum
22-03-2016, 12:40
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Replies: 26
Views: 6,390
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Forum: General Forum
22-03-2016, 12:38
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Replies: 26
Views: 6,390
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Forum: Electrical
28-02-2016, 18:56
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Replies: 4
Views: 848
Re: PDP resistance
Do you have any fuses in the PDP? It may be possible that metal shavings are somehow shorting the PDP somewhere. 77 ohms is way too low of a resistance between supply rails. Keep us updated!
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Forum: Electrical
26-02-2016, 23:29
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Replies: 2
Views: 822
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Forum: Electrical
26-02-2016, 00:24
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Replies: 17
Views: 2,550
Re: Better gyroscope?
You're right, the ADXRS450/453 is a nice gyro core on its own! If you're looking for high VRE (Vibration Rectification Error) take a look at the ADIS16448. It has much better VRE and lower drift vs...
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Forum: Electrical
26-02-2016, 00:19
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Replies: 14
Views: 1,666
Re: ADXRS450 Gyro
That's correct, the ADXRS450 is a single-axis device. If you have some spare FIRST Choice points, you could pick up an IMU ;)
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Forum: Electrical
24-02-2016, 23:19
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Replies: 17
Views: 2,550
Re: Better gyroscope?
If your team used your AndyMark First Choice points, you should have received an FRC Gyro & Accel board with your order free of charge. This sensor should provide much better performance!
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Forum: Electrical
24-02-2016, 23:16
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Replies: 14
Views: 1,666
Re: ADXRS450 Gyro
Agreed, there are a few simple algorithms out there to measure tilt using 2 accelerometer axes. The ADXRS450 will allow you to measure rotation in one axis, but it will drift over time. I highly...
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Forum: Electrical
13-02-2016, 15:24
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Replies: 10
Views: 1,613
Re: Longer Talon SRX Data Cables
The ribbon cables aren't my preferred choice, but they work.. We just extend the wires connected to the breakout boards and use the ribbon cables sold on the CTRE website.
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Forum: Sensors
07-02-2016, 00:45
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Replies: 58
Views: 17,033
Re: Got Gyro drift? Try Sensor Fusion !
Hi everyone! I hate to bring up an old post, but I want to post a shout-out to the RoboBees for providing the FIRST community with an elegant AHRS implementation!
As some of you may know, I've been...
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Forum: Electrical
20-01-2016, 19:55
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Replies: 20
Views: 3,335
Re: Neopixels & regulators
The easiest (and for veteran teams, cheapest) way to get NeoPixels on your robot is to use an old regulator to power your LEDs and use the 5V bus from the RoboRIO to power your microcontroller....
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Forum: Electrical
19-01-2016, 17:14
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Replies: 20
Views: 1,885
Re: Velcro for electrical components
From what I've observed, the cheap, "fuzzy" Velcro keeps things from falling off, but doesn't keep them from moving/flexing. Since robots are expected to go over bumps and traverse rough terrain this...
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Forum: Electrical
19-01-2016, 12:47
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Replies: 20
Views: 1,885
Re: Velcro for electrical components
Same here, although we've been known to use a couple of zipties for heavier and more "in the way" components. I do not recommend "fuzzy" Velcro for mounting electronics.
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Forum: Electrical
18-01-2016, 18:30
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Replies: 21
Views: 2,956
Re: IMUs
We're starting to veer off-topic, so I'm sure the moderators would like it if you started a new thread with those questions!
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Forum: Electrical
18-01-2016, 16:10
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Replies: 16
Views: 3,654
Re: Passive POE
Just pointing this out, but it seems that this has never been illegal to begin with! Passive POE is, and has been, legal because the passive injectors are basically cable splices with nice housings...
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Forum: Electrical
18-01-2016, 16:07
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Replies: 21
Views: 2,956
Re: IMUs
We've used the E4P encoders for many years with great success, but they're tricky to install. It all depends on which wheelbox you're planning on using.
In theory you could use the BNO055 to...
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Whether or not you use wheel weights, if you're running a wheel at several thousand RPM, you'd better have an effective containment system to protect the outside world in case something spontaneously disassembles itself. - Alan Anderson [more] 
