Wanted: Analog Gyro Breakout Board
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Wanted: Analog Gyro Breakout Board

by randomvibe on Sun Mar 31, 2013 4:00 am

Does Adafruit have plans for an analog gyro breakout board? Such a product would compliment analog accel sensors for my IMU fusion project. Synchronization between all sensors is critical. In fact, why did Adafruit go with the I2C/SPI gyro? Analog sensors are just simpler and cleaner. With the Arduino Due, there are plenty of ADC channels and decent resolution (12bit). Hopefully an analog gyro is in the works. Thanks.
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Re: Wanted: Analog Gyro Breakout Board

by adafruit_support_mike on Sun Mar 31, 2013 7:12 pm

In terms of breadth of utility for SKU bookkeeping overhead, the digital sensors fit our requirements a bit better. The Due may have adaquate ADC capacity to handle analog sensors, the Raspberry Pi doesn't have ADCs at all, and the Arduino's ADC chugs away at about 490Hz by default. We lean toward devices that can be applied as widely as possible, and SPI/I2C tend to be spoken everywhere in the world of microcontrollers.

If you have a specific sensor in mind, but don't feel like dead-bugging a 40-pin QFN pacakge, we do have generic breakouts for many SMT packages:

http://www.adafruit.com/products/1212
http://www.adafruit.com/products/1207
http://www.adafruit.com/products/1208
etc
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Re: Wanted: Analog Gyro Breakout Board

by randomvibe on Mon Apr 01, 2013 1:39 am

mstone@yawp.com wrote:In terms of breadth of utility for SKU bookkeeping overhead, the digital sensors fit our requirements a bit better.

Really? What's more important, your requirements or customer requirements? At least a balance of the two makes sense for all parties. Examining the microcontroller boards offered at Adafruit, ADC channels outweigh SPI/I2C . So why deny your customers analog gyros, especially when you're selling analog accels already. I'm sure Adafruit industries can handle the "SKU bookkeeping overhead" - I hope you were being facetious on this.

mstone@yawp.com wrote:The Due may have adequate ADC capacity to handle analog sensors, the Raspberry Pi doesn't have ADCs at all...

It doesn't make sense to deny your Arduino, Arduino Due, mbed, beaglebone, and netduino customers analog devices over the overly hyped R-Pi. I hope Adafruit reconsiders offering an analog gyro for non-RPi customers.
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Re: Wanted: Analog Gyro Breakout Board

by adafruit_support_bill on Mon Apr 01, 2013 8:57 am

Thank you for the suggestion.
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Re: Wanted: Analog Gyro Breakout Board

by randomvibe on Wed Apr 03, 2013 8:58 pm

What is the possibility of offering your customers an analog gyro in the next few months to compliment the analog accel?

By the way, great balanced design with the digital gyro you offer now; all 4 corners constrained. If you ever offer an analog version, please do the same.
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Re: Wanted: Analog Gyro Breakout Board

by randomvibe on Mon Apr 29, 2013 6:04 pm

Very happy to see the BeagleBone Black on Adafruit. Now that most of your 8-bit, 16-bit and 32-bit microcontrollers feature ADCs, as do some of the single-board-computers, will Adafruit offer analog gyros to complement the analog accelerometers?
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Re: Wanted: Analog Gyro Breakout Board

by tldr on Mon Apr 29, 2013 9:30 pm

"If I had known it was harmless, I would have killed it myself." - Phillip K. Dick, A Scanner Darkly
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Re: Wanted: Analog Gyro Breakout Board

by randomvibe on Tue Apr 30, 2013 4:29 am

Yes, I've seen that gyro at Sparkfun. It's literally the last analog gyro for $29.95 USD, and it's overpriced by $10.

Pololu.com sold low range gyros (+/- 100deg/sec) for $19.95 but discontinued them. You can still find them at a few Canadian websites. Pololu.com is still selling their remaining high range analog gyros (+/-500deg/sec) on sale for $11.95 while supplies last. The rest of the gyros are digital devices. I suppose to make them compatible with the Raspberry-Pi, the killer of analog devices. Hopefully the BeagleBone Black will alter that trend.
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Re: Wanted: Analog Gyro Breakout Board

by adafruit on Tue Apr 30, 2013 11:51 am

Hi randomvibe, can you let us know what the best Analog Gyro chip is? There's a few out there, we would want to make sure to carry the best. can you tell us the pro's & cons of the various Analog Gyros on the market right now? That would help us narrow down which analog gyro might be the best fit for Adafruit :)

Thanks!
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Re: Wanted: Analog Gyro Breakout Board

by randomvibe on Fri Jun 28, 2013 2:45 am

The STM LPR410AL chip is the "best" analog gyro chip in my opinion. "Best" means a reasonable balance of these key criteria: price, operating voltage & current, noise, and other. Essentially, there are only two producers of analog gyros in-stock at digikey - Analog Devices Inc. (ADI) and ST Microelectronics (STM). This table compares two comparable range chips vs. key criteria:
Code: Select all | TOGGLE FULL SIZE
   Criteria          ADI        STM          Winner
   ----------        -------    --------     --------
   Model             ADXR623    LPR410AL
   Price per 1000    $27.24     $3.57        STM
   Supply voltage    5.0 V      3.0 V        draw
   Supply current    3.5 mA     6.8 mA       ADI
   Range (deg/sec)   150        100 & 400    STM
   Noise             0.040      0.014        STM
   Frequency Range   3000 hz    140 hz       ADI
   No. of Axii       1          2            STM

STM LPR410AL clearly beats the ADXR623 on price (ADX higher by factor of 7.6!), number of axii, noise, and range. For each axis, the STM chip provides two ranges (100 & 400 deg/sec) that should apply widely to most diy projects in my opinion. The only minor drawback to STM is supply current, but that is manageable.

Adafruit.com and Pololu.com are my main goto suppliers, so I brought up this issue at Pololu too:

http://forum.pololu.com/viewtopic.php?f=14&t=7091

The Pololu president wrote that STM has "... newer (L3G...) analog parts coming out ...", but they are in the "evaluation" stage, and their range may be too high (625 deg/sec) for most diy projects.
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Re: Wanted: Analog Gyro Breakout Board

by adafruit_support_bill on Fri Jun 28, 2013 6:57 am

Thanks. We'll check it out. :)
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