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Re: Reading RSSI of Xbee Series 2

 by waltr ¦  Tue Jan 20, 2015 9:02 am ¦  Forum: Wireless/RF ¦  Topic: Reading RSSI of Xbee Series 2 ¦  Replies: 33 ¦  Views: 8515

Thank you Steve, My RSSI test for Xbee ranges 61 to 103 with 86 average at 3 feet. 79 to 296 with average of 112 at 5 feet. While RFM69W RSSI is much more stable. 34 to 28 with 31 average at 3 feet. 50 to 41 with average 46 at 5 feet. Though, I don't know whether 433 MHz is less susceptable to inte...

Re: Monster Moto Shield reduces/limits the motor torque

 by waltr ¦  Tue Jan 20, 2015 8:49 am ¦  Forum: SparkFun Product Questions ¦  Topic: Monster Moto Shield reduces/limits the motor torque ¦  Replies: 3 ¦  Views: 536

How did you solve this???????

Re: meauring phase difference between two 2.4 GHz radio sign

 by waltr ¦  Fri Jan 16, 2015 11:55 am ¦  Forum: Projects ¦  Topic: meauring phase difference between two 2.4 GHz radio signals ¦  Replies: 27 ¦  Views: 1552

This one does sound like a university physics/engineering project.

But until he/she states exactly what they want to accomplish we can only guess at solutions.

Re: COM Port not recognized with XBee USB

 by waltr ¦  Mon Jan 12, 2015 7:42 am ¦  Forum: Wireless/RF ¦  Topic: COM Port not recognized with XBee USB ¦  Replies: 5 ¦  Views: 1026

Which XBee USB board? link?

Re: Xbee communication problem

 by waltr ¦  Wed Jan 07, 2015 7:37 am ¦  Forum: Wireless/RF ¦  Topic: Xbee communication problem ¦  Replies: 3 ¦  Views: 1035

The data is Binary not ASCII.

Re: Hmc 5883 compass address.

 by waltr ¦  Sat Dec 27, 2014 8:48 pm ¦  Forum: Arduino ¦  Topic: Hmc 5883 compass address. ¦  Replies: 8 ¦  Views: 1405

Since you determined the I2C base address is 0x1E then you change this to do a write command to the base address.

Ok on that being the other chip. I saw this address in the comments of the code You posted.
The info still applies but for a different address as in the data sheet.

Re: Rfid starter kit

 by waltr ¦  Sat Dec 27, 2014 8:44 pm ¦  Forum: SparkFun Product Questions ¦  Topic: Rfid starter kit ¦  Replies: 4 ¦  Views: 454

Try a different USB cable.

Re: Hmc 5883 compass address.

 by waltr ¦  Sat Dec 27, 2014 9:31 am ¦  Forum: Arduino ¦  Topic: Hmc 5883 compass address. ¦  Replies: 8 ¦  Views: 1405

the address specified in the datasheet is 66 (0x42) The I2C in data sheets can be confusing. 0x42 = 0100 0010b but if this is the 7 bit address then it is 100 0010b and then shifted left to the 8 bit address + R/W register it is 1000 0100x = 0x84. Then don't forget the lsb is the r/w bit so clear/s...

Re: Change the baud rate

 by waltr ¦  Wed Dec 24, 2014 7:54 am ¦  Forum: SparkFun Product Questions ¦  Topic: Change the baud rate ¦  Replies: 7 ¦  Views: 640

That PIC does not have any hardware flow control built in. You must write code to use some IO pins for hardware flow control (RTS, CTS) and and your code must handle this. Same if you would rather have Soft Flow control (uses Flow control characters in the ASCII character set). Your code must do this.

Re: Need Help Controlling Stepper Motor

 by waltr ¦  Tue Dec 23, 2014 6:12 am ¦  Forum: Projects ¦  Topic: Need Help Controlling Stepper Motor ¦  Replies: 5 ¦  Views: 499

Lots and lots of info on driving running stepper motors in the forums here and on the web.
Search and read.
Hint: There are many chips designed just to drive and control steppers, look these up and read the data sheet and app notes.

Re: Raspi Long Range Video Feed

 by waltr ¦  Mon Dec 22, 2014 7:41 am ¦  Forum: Wireless/RF ¦  Topic: Raspi Long Range Video Feed ¦  Replies: 7 ¦  Views: 1129

Another totally different approach is analog video transmission. No need what so ever of any computer needed. There are fairly low cost video Transmitters/receivers operating on 2.4 or 5.8GHz that will go a 1/3 miles with a clear "line of sight". The common use for these is a video down link from mo...

Re: Best elements for downhole and high temperature circuits

 by waltr ¦  Mon Dec 22, 2014 7:24 am ¦  Forum: SparkFun Product Questions ¦  Topic: Best elements for downhole and high temperature circuits ¦  Replies: 3 ¦  Views: 371

In my last job I designed circuits for 'down hole'. All circuits were in containers that where designed to take the pressure. These containers were designed by very experienced mechanical engineers and underwent extensive testing with many spectacular failures. Mee_n_Mac is completely correct is sta...

Re: Fast, accurate, tracking of multiple objects in small ar

 by waltr ¦  Thu Dec 18, 2014 8:16 am ¦  Forum: Projects ¦  Topic: Fast, accurate, tracking of multiple objects in small area? ¦  Replies: 12 ¦  Views: 981

Yea, its all FM (Freaking Magic) that can do anything like in all the really BAD SF movies.

Re: Conductive Yarn

 by waltr ¦  Thu Dec 18, 2014 8:12 am ¦  Forum: SparkFun Product Questions ¦  Topic: Conductive Yarn ¦  Replies: 1 ¦  Views: 227

Check the AdaFruit tutorials and projects. I'm sure Lady Ada has played with this.

Re: Controlled Rotation over Programmed Time

 by waltr ¦  Thu Dec 18, 2014 8:11 am ¦  Forum: SparkFun Product Questions ¦  Topic: Controlled Rotation over Programmed Time ¦  Replies: 4 ¦  Views: 365

Search and read the forums here. This has been asked and answered many times.

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