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Re: Project/product: high accuracy/update rate laser rangefi

 by Duane Degn ¦  Tue Jul 17, 2012 4:34 pm ¦  Forum: SparkFun Product Questions ¦  Topic: Project/product: high res/update rate laser rangefinder ¦  Replies: 24 ¦  Views: 8383

I think you'd have a lot of people interested in an inexpensive, high sample rate, high precision, rangefinder. You might want to take a look at this recently designed laser range finder. There's additional discussion at the Parallax forums about develo...

Re: Stuttering ESC

 by Duane Degn ¦  Tue Jul 17, 2012 9:08 am ¦  Forum: SparkFun Product Questions ¦  Topic: Stuttering ESC ¦  Replies: 10 ¦  Views: 999

I've also purchased a bunch of stuff from HobbyKing.

I've been very pleased with what I get for the price.

They can take a while to ship (around a month I think).

Re: High Accuracy distance sensor?

 by Duane Degn ¦  Tue Jul 17, 2012 8:47 am ¦  Forum: SparkFun Product Questions ¦  Topic: High Accuracy distance sensor? ¦  Replies: 12 ¦  Views: 12818

For the simple sensors, that's probably true, but you should be able to do much better by comparing the phase. Ultrasonic anemometers need to be able to detect the time of arrival with far more accuracy than 1 cycle in order to get useful resolution / accuracy. Thanks for the clarification and addi...

Re: Using Servo's for an Analog Clock

 by Duane Degn ¦  Mon Jul 16, 2012 8:21 pm ¦  Forum: SparkFun Product Questions ¦  Topic: Using Servo's for an Analog Clock ¦  Replies: 3 ¦  Views: 1489

skimask if correct about the lack of position feedback with a CR servo. While a stepper is a good option, you could still use the CR servo if you also used some sort of encoder. I've used these sensors to make my own optical encoder. If you use two of these sens...

Re: High Accuracy distance sensor?

 by Duane Degn ¦  Mon Jul 16, 2012 7:40 pm ¦  Forum: SparkFun Product Questions ¦  Topic: High Accuracy distance sensor? ¦  Replies: 12 ¦  Views: 12818

The ultrasound sensors work surprisingly well. Even the cheap $4 units on eBay are pretty accurate. All ultrasound sensors are limited by the wavelength of the sound. A ultrasound sensor can not measure more precisely than the length of its wavelength (which I believe is one or two mm). The medical ...

Re: Connect grounds on Beaglebone and external supply?

 by Duane Degn ¦  Sun Jul 15, 2012 10:30 pm ¦  Forum: SparkFun Product Questions ¦  Topic: Connect grounds on Beaglebone and external supply? ¦  Replies: 4 ¦  Views: 635

I'm pretty sure it's normal to have signal and power grounds connected together at some point. I believe it's best practice to have this connection at only one location. Many motor driving circuits will not work without some sort of common ground connection. I really don't think this will hurt your ...

Re: Brushless Motor Controller pwm Voltage

 by Duane Degn ¦  Sun Jul 15, 2012 11:49 am ¦  Forum: SparkFun Product Questions ¦  Topic: Brushless Motor Controller pwm Voltage ¦  Replies: 3 ¦  Views: 1148

You shouldn't have a problem with 3.3V logic with your ESC. You still need to power the ESC with 5V.

I've used lots of different servos and ESCs with 3.3V logic. I think I've only had one servo not recognize 3.3V as logic high.


Re: CMOS Camera - 1300x1040 with zoom

 by Duane Degn ¦  Sun Jul 15, 2012 11:38 am ¦  Forum: SparkFun Product Questions ¦  Topic: CMOS Camera - 1300x1040 with zoom ¦  Replies: 1 ¦  Views: 380

I think it would be a lot easier to purchase a camera module that had lens mounts for adding an optical zoom. To add a zoom to the camera you mentioned (a link would have been nice) would probably require removing the original lens and building some sort of mount for a zoom lens. You'd also need mak...

Re: Displays for CMOS camera

 by Duane Degn ¦  Sun Jul 15, 2012 11:32 am ¦  Forum: SparkFun Product Questions ¦  Topic: Displays for CMOS camera ¦  Replies: 3 ¦  Views: 444

I don't think any of SparkFun's display can display an image directly from a camera's output. The simplest camera (sold by SparkFun) to interface with is probably this one. It outputs a NTSC signal which can be viewed on many TV monitors. I don't think any of Sp...

Re: CMOS Camera Module to SD-card

 by Duane Degn ¦  Sun Jul 15, 2012 11:26 am ¦  Forum: SparkFun Product Questions ¦  Topic: CMOS Camera Module to SD-card ¦  Replies: 5 ¦  Views: 683

You didn't mention the resolution nor the output of the CMOS camera. The FlyCamOne is likely a CMOS camera and it records directly to a uSD card. Your HDMI cameras will likely output too much information to capture to a SD card without some serious compression. There are lots of video cameras that r...

Re: RF24L01P: Cannot write/read control registers

 by Duane Degn ¦  Mon Jul 09, 2012 9:37 pm ¦  Forum: Wireless/RF ¦  Topic: RF24L01P: Cannot write/read control registers ¦  Replies: 4 ¦  Views: 1060

I think CE line is just to turn on/off radio part of the chip. I think you are correct. I tried to find the information about the CE line needing to be low to write registers and I found I had misunderstood the datasheet previously (there's a lot of information to keep straight in that datasheet). ...

Re: Giving the propeller some love?

 by Duane Degn ¦  Mon Jul 09, 2012 8:48 pm ¦  Forum: SparkFun Site Questions/Comments ¦  Topic: Giving the propeller some love? ¦  Replies: 3 ¦  Views: 1522

I also agree. There are lots of projects the Propeller would excel at when compared with other uCs. For example, the Rover 5 can require a lot of processing power. There are four quadrature encoders to monitor. Four motors to control. And if you want to control the Rover 5 with a RC system, you need...

Re: Low Cost Vision Module

 by Duane Degn ¦  Thu Jul 05, 2012 7:07 pm ¦  Forum: SparkFun Product Questions ¦  Topic: Low Cost Vision Module ¦  Replies: 70 ¦  Views: 28871

I'm watching this project with much interest.

Thanks for the updates.

BTW, I've heard a rumor(from a good source) SparkFun plans on selling the CMUCam4. Even with SparkFun selling the CMUCam4, I think there's still a market for other robot vision solutions.

Good luck,


Re: RF24L01P: Cannot write/read control registers

 by Duane Degn ¦  Thu Jul 05, 2012 11:22 am ¦  Forum: Wireless/RF ¦  Topic: RF24L01P: Cannot write/read control registers ¦  Replies: 4 ¦  Views: 1060

Did you set the CE line low prior to writing the register?

Those nRF24L01+ have a lot going on. I'm only just starting to understand all they can do.

I do remember reading that the CE pin needs to be set low when writing to some registers.

Re: flush RX nrf24l01

 by Duane Degn ¦  Thu Jul 05, 2012 11:15 am ¦  Forum: Wireless/RF ¦  Topic: flush RX nrf24l01 ¦  Replies: 2 ¦  Views: 2091

I agree with JulsPower.

I don't see a flush rx command.