Search found 2304 matches

by jremington
Fri Dec 14, 2018 7:40 pm
Forum: SparkFun Product Questions
Topic: Using Serial7SegmentDisplay S7s display arduino
Replies: 2
Views: 31

Re: Using Serial7SegmentDisplay S7s display arduino

Alternatively, you could use the function dtostrf() to convert the number to ASCII characters, but that is not simple as the number of digits after the decimal point have to be carefully chosen.
by jremington
Fri Dec 14, 2018 8:59 am
Forum: SparkFun Product Questions
Topic: Using Serial7SegmentDisplay S7s display arduino
Replies: 2
Views: 31

Re: Using Serial7SegmentDisplay S7s display arduino

You will have to convert the floating point number to an integer, including leading zeros, and place the decimal point correctly.
by jremington
Thu Dec 13, 2018 9:10 pm
Forum: SparkFun Product Questions
Topic: Is the Sparkfun Inventor's Kit Worth It ?
Replies: 1
Views: 33

Re: Is the Sparkfun Inventor's Kit Worth It ?

A more relevant question might be: is the class worth $100 to you? The SIK is sort of a course in itself.

On the other hand, you can buy an Arduino Pro Mini clone for $2 on eBay. Motors can be scrounged from a toy, etc.
by jremington
Tue Dec 11, 2018 8:04 pm
Forum: Projects
Topic: N00b - Theremin sensor HC-SR04 project, need to add 2nd or more sensor
Replies: 1
Views: 34

Re: N00b - Theremin sensor HC-SR04 project, need to add 2nd or more sensor

Cool project! Please use code tags ("</>" button) to post code, so that it looks like this: digitalWrite(pingPin, LOW); delayMicroseconds(2); digitalWrite(pingPin, HIGH); delayMicroseconds(10); digitalWrite(pingPin, LOW); duration = pulseIn(inPin, HIGH); // the singal from the Sensor is measured. Th...
by jremington
Mon Dec 10, 2018 9:49 am
Forum: SparkFun Product Questions
Topic: How to extend I2C communication for 15 meters and similar addresses devices ?
Replies: 2
Views: 39

Re: How to extend I2C communication for 15 meters and similar addresses devices ?

I would use Arduino Pro Minis to locally control the remote I2C devices, with multidrop RS422 or RS485 adapters on cat5 cable. Power can be transmitted over the cable, too. Some suitable protocol must be developed to allow the master node to control a remote node, with its devices. If speed is not a...
by jremington
Sun Dec 09, 2018 6:27 pm
Forum: SparkFun Product Questions
Topic: FTDI Basic Open Both Solder Jumpers
Replies: 4
Views: 128

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: 128

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: 128

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: 354

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: 216

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: 216

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: 216

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: 67

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: 3159

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?