Search found 70 matches

by Duane Degn
Fri Mar 22, 2013 11:18 pm
Forum: SparkFun Product Questions
Topic: :?: Narrowing the beam of a ultrasonic rangefinder?
Replies: 5
Views: 1468

Re: :?: Narrowing the beam of a ultrasonic rangefinder?

I found this recently.

https://www.virtuabotix.com/?question=m ... th-hc-sr04

It's for a sensor with two transducers. It might work with your Maxbotix too.
by Duane Degn
Thu Jan 24, 2013 3:06 pm
Forum: SparkFun Product Questions
Topic: Connecting camera with uC and processing captured images
Replies: 4
Views: 486

Re: Connecting camera with uC and processing captured images

The Propeller can do some very basic video capture. Here's a picture showing the word "HI" being displayed on a LED array after being captured through a black and white NTSC camera. http://forums.parallax.com/attachment.php?attachmentid=80519&d=1303582009 Here's link to more information about the pr...
by Duane Degn
Wed Jan 23, 2013 10:14 pm
Forum: SparkFun Product Questions
Topic: Humidity sensor questions
Replies: 6
Views: 853

Re: Humidity sensor questions

I'm hooking this up to an XBee analog input which only has a range of 0-1.2V. I don't think this is correct. The high reference voltage on the XBee needs to between 2.08V and Vddad. I'm pretty sure Vddad is Vcc or 3.3V. I'm pretty sure if you use 3.3V on the Vref pin, you can measure voltages betwe...
by Duane Degn
Sun Jan 13, 2013 1:32 am
Forum: SparkFun Product Questions
Topic: wheels and motors
Replies: 4
Views: 382

Re: wheels and motors

I second waltr's warning about the motors you linked to. The only way they will power a vehicle with a wheel directly attached to it is if the vehicle is going down a steep incline. Those motors will not be able to power a robot with wheels directly attached to them. I purchased several of these mot...
by Duane Degn
Sat Dec 29, 2012 11:34 pm
Forum: SparkFun Product Questions
Topic: Controlling RGB LED Strip
Replies: 2
Views: 399

Re: Controlling RGB LED Strip

Another alternative for a controller is the Parallax Propeller.

Here's my hexacopter with these same lights fastened to it.

A QuickStart board costs $25.
by Duane Degn
Mon Dec 10, 2012 5:47 am
Forum: SparkFun Product Questions
Topic: Robot with Various voltage requirements
Replies: 2
Views: 509

Re: Robot with Various voltage requirements

Do you have a reason for the battery voltages you listed? The Sabertooth runs fine on a three cell LiPo. I'd think that would be my battery of choice. I worry about the 6V regulator. It's a linear regulator and will get very hot. With that many servos, you'd be better off with a switching regulator ...
by Duane Degn
Fri Dec 07, 2012 8:46 pm
Forum: SparkFun Product Questions
Topic: LiPo Charging
Replies: 38
Views: 3899

Re: LiPo Charging

it'll be a bit of a waste because with the voltage loss from the diodes, I'm back at 4:5V and I need 5V ... hrm. Need to think about this. Doesn't the buck/boost happen after the "load" connection? Since the diodes are placed before the regulator and not after, your curcuit should still see whateve...
by Duane Degn
Wed Dec 05, 2012 6:06 am
Forum: SparkFun Product Questions
Topic: RCA Composite Video ADC to USB Dev Board
Replies: 4
Views: 1837

Re: RCA Composite Video ADC to USB Dev Board

I'm not quite sure of what you're after. It sounds like you want a video capture device. There are lots of those available for a lot less than $150. I'm not sure how the video data is streamed to the PC from such a capture device and how one would use it to do machine vision. There's a smart guy nam...
by Duane Degn
Mon Dec 03, 2012 9:34 pm
Forum: SparkFun Product Questions
Topic: LED Matrix RGB custom pcb
Replies: 2
Views: 510

Re: LED Matrix RGB custom pcb

Does your LED array have the pins arranged the same as SparkFun's arrays?

I purchased a bunch of arrays from ebay for $6 each. The control pins are arranged differently than the one SparkFun uses.

Here's a link to my project.
by Duane Degn
Mon Nov 26, 2012 12:17 am
Forum: SparkFun Product Questions
Topic: ID-12 RFID module
Replies: 1
Views: 293

Re: ID-12 RFID module

Based on the comments on the ID-12 page, it looks like it works just fine with a serial connection to a PC.

There are lots of informative comments with at least one correction to the datasheet.
by Duane Degn
Sun Nov 25, 2012 4:01 pm
Forum: SparkFun Product Questions
Topic: LED's, spectrum shield, shift register. Right Direction?
Replies: 3
Views: 689

Re: LED's, spectrum shield, shift register. Right Direction?

the maximum output in amps for the arduino UNO is 200ma and maximum sinking in amps is 400ma. Both of these figures are insufficient for the number of LEDS im looking to power. How did you address this is your project? Lots of projects will use more power than what a microcontroller board can suppl...
by Duane Degn
Sun Nov 25, 2012 11:05 am
Forum: SparkFun Product Questions
Topic: Obstacle avoidance with a UGV
Replies: 20
Views: 2199

Re: Obstacle avoidance with a UGV

Let's see if I can save Mee_n_Mac some typing. D would be distance an object needs to be in order to start avoiding it. Let's assume you set it equal to 25 somewhere earlier in your code. You would also set the value of "L_R" base on which side the ostacle was found. For example let's say you found ...
by Duane Degn
Sat Nov 24, 2012 5:50 pm
Forum: SparkFun Product Questions
Topic: Obstacle avoidance with a UGV
Replies: 20
Views: 2199

Re: Obstacle avoidance with a UGV

Why not use an angorithm to turn based on how close the obstical is. Instead of "digitalWrite(constant);" Assuming "digitalWrite(constant);" makes the car turn with a large value making the car turn more than a small value. use: " x = SOME_CONSTANT / distance; digitalWrite(x);" So as the distance in...
by Duane Degn
Wed Nov 21, 2012 9:11 pm
Forum: SparkFun Product Questions
Topic: Using 0805 on 0603
Replies: 8
Views: 2572

Re: Using 0805 on 0603

Attached is an image from DipTrace for pads of 0603 (C1) and 0805 (C2) caps.

I'm betting the 0805 will work on the 0603 pads.
SmtCaps121121a.PNG
DipTrace pad for 0603 and 0805 caps
by Duane Degn
Tue Nov 20, 2012 5:39 pm
Forum: SparkFun Product Questions
Topic: Using a Rotary Position Sensor
Replies: 5
Views: 1557

Re: Using a Rotary Position Sensor

One gotch may be what happens when the wiper reaches the end of the resistive element and jumps to the other end. Does the resistance at the wiper go open or glitchlessly change from maximum to minimum resistance. The datasheet says "Adjustment Angle 330 degress nom.", it looks like there's 30 degr...