Search found 2202 matches

by jremington
Mon Aug 13, 2018 9:10 am
Forum: SparkFun Product Questions
Topic: IMU shield
Replies: 7
Views: 79

Re: IMU shield

Many accelerometers have a "free fall detection" output.
The popular ADXL345 is one of those.
by jremington
Sun Aug 12, 2018 5:20 pm
Forum: Projects
Topic: LED Project, looking for advice on what I need
Replies: 3
Views: 80

Re: LED Project, looking for advice on what I need

You need to decide which LEDs you will be using (color and power), and how many.
Let us know what you decide, and post a link to the LED data sheet or product page.

You could also do some research on your own. Google (for example) "choose resistor LED" for lots of helpful advice.
by jremington
Sat Aug 11, 2018 7:26 pm
Forum: SparkFun Product Questions
Topic: IMU shield
Replies: 7
Views: 79

Re: IMU shield

Is that a joke question, or are you really too lazy to read the product description?
by jremington
Sat Aug 11, 2018 10:34 am
Forum: SparkFun Product Questions
Topic: IMU shield
Replies: 7
Views: 79

Re: IMU shield

They use completely different chips measure acceleration, rotation and magnetic fields, so the only similarity is the goal.
by jremington
Thu Aug 09, 2018 4:23 pm
Forum: Projects
Topic: adhesive used on keyboard trim
Replies: 3
Views: 72

Re: adhesive used on keyboard trim

I hope it hasn't become self-aware.
It probably has, and will fail at precisely those moments when you need it most.
by jremington
Wed Aug 08, 2018 7:41 am
Forum: SparkFun Product Questions
Topic: GPS Logger File Naming
Replies: 2
Views: 45

Re: GPS Logger File Naming

You might check whether 10 character file names are allowed.
by jremington
Fri Aug 03, 2018 11:06 am
Forum: Projects
Topic: How to control a 230V DC motor
Replies: 3
Views: 73

Re: How to control a 230V DC motor

For the coffee grinder, better to use a low voltage DC motor. In either case, a switch would be fine as a controller.
by jremington
Wed Aug 01, 2018 11:16 am
Forum: Projects
Topic: Trouble with a Transducer - Trying to switch it off
Replies: 8
Views: 162

Re: Trouble with a Transducer - Trying to switch it off

That won't work.

The NPN transistor is arranged backwards, with C and E swapped. It could be destroyed and might take the microprocessor with it, by feeding 12V into an output pin. See reply #1 for the correct way to connect it.
by jremington
Tue Jul 31, 2018 7:42 pm
Forum: SparkFun Product Questions
Topic: BNO080 IMU - Fundamental position error?
Replies: 6
Views: 93

Re: BNO080 IMU - Fundamental position error?

Yep, the firmware sucks. RTImulib doesn't. Bye.
by jremington
Tue Jul 31, 2018 5:38 pm
Forum: SparkFun Product Questions
Topic: BNO080 IMU - Fundamental position error?
Replies: 6
Views: 93

Re: BNO080 IMU - Fundamental position error?

PS: with the AltIMU10/RTimulib combination, everything is open source, and you don't have to deal with a mysterious, poorly documented "black box" calibration procedure.
by jremington
Tue Jul 31, 2018 5:16 pm
Forum: SparkFun Product Questions
Topic: BNO080 IMU - Fundamental position error?
Replies: 6
Views: 93

Re: BNO080 IMU - Fundamental position error?

The numbers then settle back to actual position a few seconds later. The "internal firmware quaternion function" (the filter) is clearly working, but perhaps not to your expectations. See this discussion concerning the performance of the very similar BNO055: https://forums.adafruit.com/viewtopic.ph...
by jremington
Tue Jul 31, 2018 1:07 pm
Forum: Projects
Topic: Need part help
Replies: 8
Views: 72

Re: Need part help

Everyone would benefit if you attempted to make some sense.

Photo of a male spade connector:
Image
by jremington
Tue Jul 31, 2018 8:15 am
Forum: Projects
Topic: Need part help
Replies: 8
Views: 72

Re: Need part help

Spade connectors
by jremington
Mon Jul 30, 2018 8:16 am
Forum: SparkFun Product Questions
Topic: Current measurement with big easy driver v 1.2
Replies: 1
Views: 37

Re: Current measurement with big easy driver v 1.2

Please describe in detail how you are measuring the voltage at the test point.

The symptoms suggest that your method is injecting a signal (possibly AC line interference) into the driver circuitry.