Search found 2298 matches

by jremington
Sun Dec 09, 2018 6:27 pm
Forum: SparkFun Product Questions
Topic: FTDI Basic Open Both Solder Jumpers
Replies: 4
Views: 106

Re: FTDI Basic Open Both Solder Jumpers

From the chip docs:
FT232RL_VccIO.png
by jremington
Sun Dec 09, 2018 5:41 pm
Forum: SparkFun Product Questions
Topic: FTDI Basic Open Both Solder Jumpers
Replies: 4
Views: 106

Re: FTDI Basic Open Both Solder Jumpers

Yes, you made your point clear. Unfortunately, I evidently did not. Check the data sheet for the FTDI USB-RS232 chip and the schematic for the Sparkfun board. The I/O section of the USB-RS232 chip is a separate chip power input that MUST BE provided with either 5V or 3.3V or it won't work at all. Th...
by jremington
Sun Dec 09, 2018 10:57 am
Forum: SparkFun Product Questions
Topic: FTDI Basic Open Both Solder Jumpers
Replies: 4
Views: 106

Re: FTDI Basic Open Both Solder Jumpers

My approach is to disconnect the Arduino from the gizmo, use power from the FTDI adapter while programming the Arduino, then reconnect the Arduino and the gizmo.

Your approach won't work, as the FTDI I/O section requires one or the other for power. Leave the jumper at 5V.
by jremington
Sat Dec 08, 2018 2:54 pm
Forum: SparkFun Product Questions
Topic: 9DoF Sensor Stick question
Replies: 13
Views: 326

Re: 9DoF Sensor Stick question

seems to be a missing part of the puzzle that should be included in the box so to speak. It is missing from Sparkfun IMU products, because Sparkfun employees either don't understand the need for it, don't understand the procedures, or don't care what their customers do with those particular product...
by jremington
Fri Dec 07, 2018 8:57 pm
Forum: SparkFun Product Questions
Topic: Parallel the TB6612FNG?
Replies: 9
Views: 207

Re: Parallel the TB6612FNG?

Be sure to let us know if it actually works.
by jremington
Fri Dec 07, 2018 8:12 pm
Forum: SparkFun Product Questions
Topic: Parallel the TB6612FNG?
Replies: 9
Views: 207

Re: Parallel the TB6612FNG?

These sites say the TB6612 can be paralleled. Is that true?
Who knows? The professional motor driver engineers don't hang around on the hobby forums.
if a paralleled TB6612FNG gives me what I need
Let us know if it actually works.
I need 100 khz or higher
Well, of course you do!
by jremington
Fri Dec 07, 2018 7:42 pm
Forum: SparkFun Product Questions
Topic: Parallel the TB6612FNG?
Replies: 9
Views: 207

Re: Parallel the TB6612FNG?

I haven't found anything else with similar specs for a similar price
Forego that extra cup of cappuccino tomorrow and splurge!

Treat yourself to a slightly higher priced motor driver that can handle 2.6 Amperes (5 A peak) without any hassle at all: https://www.pololu.com/product/2997
by jremington
Fri Dec 07, 2018 12:09 pm
Forum: Projects
Topic: Help with stepper motor position
Replies: 5
Views: 49

Re: Help with stepper motor position

I agree with the above.

To determine the shaft position of a stepper after power down, you have only two options. One is to use an absolute rotary shaft encoder, the other is to "home" the stepper upon power up, using a limit switch (and rotate back to original position).
by jremington
Tue Dec 04, 2018 8:40 am
Forum: Shipping Times
Topic: Order is still in "Exception" Status
Replies: 5
Views: 3141

Re: Order is still in "Exception" Status

I have been contacting them, but still haven't received a response from them.
They don't answer the phone?
by jremington
Mon Dec 03, 2018 12:48 pm
Forum: Shipping Times
Topic: Order is still in "Exception" Status
Replies: 5
Views: 3141

Re: Order is still in "Exception" Status

Give them a call. You are not likely to get help quickly on this forum!
by jremington
Sat Dec 01, 2018 7:20 pm
Forum: Projects
Topic: Remote Arduino cabin monitor
Replies: 4
Views: 67

Re: Remote Arduino cabin monitor

+1 for the RPi, which has built in Ethernet/USB WiFi ports. A high quality, inexpensive camera module is also available.

Standard Arduinos can't handle images and are very limited in networking capability.
by jremington
Thu Nov 29, 2018 9:21 pm
Forum: SparkFun Product Questions
Topic: 9DoF Sensor Stick question
Replies: 13
Views: 326

Re: 9DoF Sensor Stick question

To me, both code fragments are nonsense.
by jremington
Mon Nov 26, 2018 10:43 am
Forum: SparkFun Product Questions
Topic: 9DoF Sensor Stick question
Replies: 13
Views: 326

Re: 9DoF Sensor Stick question

Yes, some effort on your part is required, if you want to get the most out of your IMU. All the required code and instructions for calibrating a magnetometer and applying the resulting corrections can be found in this post. https://forum.pololu.com/t/correcting-the-balboa-magnetometer/14315 Will wor...
by jremington
Mon Nov 26, 2018 6:31 am
Forum: Arduino
Topic: Using the MCP4725
Replies: 2
Views: 45

Re: Using the MCP4725

by jremington
Sun Nov 25, 2018 8:33 am
Forum: SparkFun Product Questions
Topic: 9DoF Sensor Stick question
Replies: 13
Views: 326

Re: 9DoF Sensor Stick question

Read the previous posts for links to the required calibration procedures.

Sparkfun employees don't seem to understand or use them, which is why you see such misleading comments as "works out of the box".