Thomas Butler
  • Rockford, IL
  • United States
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Thomas Butler replied to David B Bitton's discussion What is The Smallest ArduCopter Capable Flight Controller
"@Bill, Hey great pics. FYI I am in the process of developing a FC using the Atmel/Microship SAM E70, and it is always helpful to see how people wire up their flight stacks. Thanks again! Interesting how Holybro is using HOT-MELT glue on the row of…"
Saturday
Thomas Butler replied to David B Bitton's discussion What is The Smallest ArduCopter Capable Flight Controller
"Holy moly from Holybro! ha! Not really funny! Sorry to see that..."
Apr 12
Thomas Butler replied to David B Bitton's discussion What is The Smallest ArduCopter Capable Flight Controller
"Here is something you might find interesting.  As a software/hardware engineer I know it is bad practice to mount lots of ceramic caps in parallel right next to each other due to possible cracking from thermal stress. This usage seems to be…"
Apr 12
Thomas Butler replied to David B Bitton's discussion What is The Smallest ArduCopter Capable Flight Controller
"Hate to be a pest, but could you please take a closeup or two perhaps from each side. When I zoom in on this pic it is pretty much pixelated obscuring detail... Just curious; where is the battery going to go? Thanks again!"
Apr 12
Thomas Butler replied to David B Bitton's discussion What is The Smallest ArduCopter Capable Flight Controller
"Comparable to the Crius all-in-one vs the APM except without connectors. You saved about SIX ounces! You have a controller with soldered on (by you) wires; time IS money. What happens when it fails? You will have to re-do the soldering; the wires.…"
Apr 12
Thomas Butler replied to Vindieselwalker's discussion Programming a diy drone
"And here at ArduPilot development site"
Apr 8
Thomas Butler replied to Vindieselwalker's discussion Programming a diy drone
"Other than you are advertising these web sites, how does THIS solve the problem of programming on the copter?"
Apr 8
Thomas Butler replied to ChrisAT's discussion external barometer for PIXHAWK
"And your point?"
Apr 3
Thomas Butler replied to ChrisAT's discussion external barometer for PIXHAWK
"@Derek, Well  I have some good news for you on that. The ICP10-100 (baro from Invensense/TDK) is the pressure sensor used in the ICM20789 (gyro/accel/baro from Invensense/TDK). The ICM20789 is already implemented in Arduxxxx. See the…"
Apr 2
Thomas Butler replied to ChrisAT's discussion external barometer for PIXHAWK
"The ICP10-100 barometer is waterproof. There is a code sampe and breakout board here. on Github Another ready-made here.   Unfortunately, you will have to mod Arduxxxx to make it work. Since it is I2C, it can be on a wire.…"
Apr 2
Thomas Butler replied to MR's discussion Need help with ADC Port of Pixhawk 4
"The Pixhawk uses the STM32F4xx CPU/microcontroller by ST. See info on the 12 bit ADC in the datasheet here. The ADC  input voltage is up to VREF which is typically 3.3V. There is also the air pressure ADC at 6.6V max. Just Google Pixhawk ADC,…"
Mar 25
Thomas Butler replied to Christian Mauch's discussion Safety First: 100A & 200A Hall Sensor with BEC for Pixhawk / APM
"@Darshain, voltage measurement of a battery is like a gas gauge; same as in your cell phone! Current draw can be used to indicate motor efficiency and if they are turning. P=I*E"
Feb 21
Thomas Butler commented on Chris Anderson's blog post How do modern open source autopilots compare to aerospace-grade IMUs?
"@Tom, I think I can speak for everyone listening in and commenting on this thread that your participation is excellent. It is rare that a person working at a component manufacturer ever gets involved in this sort of dialog. Thanks for being in the…"
Feb 17
Thomas Butler commented on Chris Anderson's blog post How do modern open source autopilots compare to aerospace-grade IMUs?
"@Chris, while I have your attention, how about upgrading this arcane forum software used by DIYDrones. At least, add the ability to print ALL of the posts for a thread (very common on the majority of forums today) so we don;t have to wade through…"
Feb 16
Thomas Butler commented on Chris Anderson's blog post How do modern open source autopilots compare to aerospace-grade IMUs?
"@Tom HW specifies at room temperature too as do most vendors, and most vendors (Invensense,et al) have a "percent sensitivity change vs temperature" error correction; same difference as HW's stated value at operating…"
Feb 16
Thomas Butler commented on Chris Anderson's blog post How do modern open source autopilots compare to aerospace-grade IMUs?
"@Rafael, The difference is one is an AHRS IMU and the other are discrete sensors.. Regarding Pixhawk vs HGxxxx the difference is one is a purpose built AHRS IMU device; the Honeywell IMU, The other (Pixhawk,et al) is a controller that does its own…"
Feb 15

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engineer
Hometown:
Rockford, Illinois

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