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Re: Help in US 100 Ultrasonic Sensor codes

 by waltr ¦  Thu Dec 11, 2014 9:36 am ¦  Forum: Arduino ¦  Topic: Help in US 100 Ultrasonic Sensor codes ¦  Replies: 6 ¦  Views: 1647

Your next step to debug this is connect a two channel O'scope to the Trigger and output pin os the US device. Then check that the timeing is correct for input trigger and you do see an output pulse. Once you verify the hardware is working then you can start debugging the code.

Re: Best way to set a large surface transducer

 by waltr ¦  Thu Dec 11, 2014 9:29 am ¦  Forum: Projects ¦  Topic: Best way to set a large surface transducer ¦  Replies: 2 ¦  Views: 313

Silicon sealer.
Liquid Nails.
Gorilla glue.
Epoxy.

Re: Help in US 100 Ultrasonic Sensor codes

 by waltr ¦  Wed Dec 10, 2014 7:48 am ¦  Forum: Arduino ¦  Topic: Help in US 100 Ultrasonic Sensor codes ¦  Replies: 6 ¦  Views: 1647

My guess is that the distance to too small to get the tx/rx circuits turned around to detect the pulse echo.
Try a greater distance to start.
Also, try displaying (print) the raw sensor output to add in debugging.

Re: DAQ system, best option?

 by waltr ¦  Tue Dec 09, 2014 7:25 am ¦  Forum: Projects ¦  Topic: DAQ system, best option? ¦  Replies: 2 ¦  Views: 428

It is simply configuring the Ardiuno (Atmega processor) pins for analog input, init the ADC and write a loop that reads the ADC, switch input and read the ADC again until all inputs are read. Then send the data out the UART to the USB adapter into the PC.Lots and lots of info on the web and in vario...

Re: XBee Mesh Not Working

 by waltr ¦  Mon Dec 08, 2014 9:36 am ¦  Forum: Wireless/RF ¦  Topic: XBee Mesh Not Working ¦  Replies: 5 ¦  Views: 1008

Don't ask on the forum, search and read the forum as well as the Digi Int App Notes and Xbee documents. This has all been explained which is why you probably will not get an answer on their forum.

Re: XBee Wifi - receiving sampled I/O data

 by waltr ¦  Fri Dec 05, 2014 8:09 am ¦  Forum: Wireless/RF ¦  Topic: XBee Wifi - receiving sampled I/O data ¦  Replies: 3 ¦  Views: 877

Do a Goggle search for Python code for the XBees.

Re: Running RPi on Solar Panel and battery

 by waltr ¦  Fri Dec 05, 2014 8:05 am ¦  Forum: Projects ¦  Topic: Running RPi on Solar Panel and battery ¦  Replies: 14 ¦  Views: 968

I would use 50% of rated battery cap instead of 80%.

6.0 kWh/m2/day.
189 /6.0 = 31.5 watts
Are you mixing Watts with kiloWatts?
Hours with days?
I don't follow this part.

Re: Running RPi on Solar Panel and battery

 by waltr ¦  Thu Dec 04, 2014 12:04 pm ¦  Forum: Projects ¦  Topic: Running RPi on Solar Panel and battery ¦  Replies: 14 ¦  Views: 968

You just need to ensure that in the following equations the left side is greater than the right side: Power generated >= power consumed For sunlight Solar panel power(Watts) * time (hours) >= {[R-Pi power (Watts) + efficiency losses (Watts)] * time (hours)} + used battery capacity (WHr) For night Ba...

Re: Magnetometers

 by waltr ¦  Wed Dec 03, 2014 11:20 am ¦  Forum: SparkFun Product Questions ¦  Topic: Magnetometers ¦  Replies: 1 ¦  Views: 196

First----this is a User's forum. If you need to contact SparkFun staff use the correct forum and/or contact the tech support directly. Almost any of the magnetometers they sell should work. You will need to do a bit of experimenting to determine which magnet will give usefull readings without satura...

Re: Running RPi on Solar Panel and battery

 by waltr ¦  Wed Dec 03, 2014 8:19 am ¦  Forum: Projects ¦  Topic: Running RPi on Solar Panel and battery ¦  Replies: 14 ¦  Views: 968

1- Consider a few cloudy/rainy days. This increases the time the battery is needed. 1a- Be careful on Battery capacity specs. Many batteries can not be fully discharged therefore you must adjust the capacity values in your calculations. Dividing by two is safer. 1b- Be careful on what battery you us...

Re: Help with a simple simple servo-motor project?

 by waltr ¦  Tue Dec 02, 2014 10:56 am ¦  Forum: Wireless/RF ¦  Topic: Help with a simple simple servo-motor project? ¦  Replies: 4 ¦  Views: 984

Break this project into several parts. 1- mechanics to drive the flow value. 2- Control dial, Pot, rotary encoder, etc. and how to read its value/position. 3- Data transfer protocol. A serial data steam is a good method for when the RF link is added. Does there need to be error checking (CKSUM)? 4- ...

Re: XBee 900HP with

 by waltr ¦  Wed Nov 26, 2014 9:12 am ¦  Forum: Wireless/RF ¦  Topic: XBee 900HP with ¦  Replies: 3 ¦  Views: 892

This question is best asked on the Digi Int forum or to the Digi Int tech support.

Re: Speed control for small project

 by waltr ¦  Wed Nov 19, 2014 8:38 am ¦  Forum: Projects ¦  Topic: Speed control for small project ¦  Replies: 10 ¦  Views: 576

With SMT parts a 555 & PNP circuit could be a fraction of that size.

Re: Angle position sensor

 by waltr ¦  Wed Nov 19, 2014 8:37 am ¦  Forum: Projects ¦  Topic: Angle position sensor ¦  Replies: 3 ¦  Views: 619

Rotary encoder

Re: Speed control for small project

 by waltr ¦  Tue Nov 18, 2014 11:01 am ¦  Forum: Projects ¦  Topic: Speed control for small project ¦  Replies: 10 ¦  Views: 576

Search for PWM motor control.
This can be done with a 555 and a transistor.

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