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Re: How to power a project w 12v rechargeable

 by waltr ¦  Tue Mar 17, 2015 9:42 am ¦  Forum: Projects ¦  Topic: How to power a project w 12v rechargeable ¦  Replies: 5 ¦  Views: 701

Wall Wart to convert the AC mains to a low Voltage DC that then plugs into your enclosure to power the battery change circuit.

This is a safe method so you or a user does not come into contact with AC mains Voltage.

Re: Reflow Oven - Tune

 by waltr ¦  Thu Mar 12, 2015 8:11 am ¦  Forum: Projects ¦  Topic: Reflow Oven - Tune ¦  Replies: 4 ¦  Views: 613

250°C (I assume its C) is NOT hot enough to melt the solder.

Also, the temperature peaks then drops. A "soak" time is required.
Look up what a proper temperature profile looks like. Many manufactures have re-flow profiles in the data sheets.

Re: HighAltitudeBalloon: Testing array of temp/press/hum sen

 by waltr ¦  Mon Feb 23, 2015 9:02 am ¦  Forum: Projects ¦  Topic: HighAltitudeBalloon: Testing array of temp/press/hum sensors ¦  Replies: 1 ¦  Views: 440

Have you searched for what others have used in high altitude balloons? It will not be just the sensors that will have issues with the extremely low temperatures. The computer chips, memory, radio, etc will also have issues. What I have seen done is putting all of these electronics items into a insul...

Re: ST VL6180X ToF range finder on Raspberry Pi

 by waltr ¦  Mon Feb 23, 2015 8:54 am ¦  Forum: SparkFun Product Questions ¦  Topic: ST VL6180X ToF range finder on Raspberry Pi ¦  Replies: 2 ¦  Views: 2114

Nice trouble shooting, find and fix.
Thanks for posting.

Re: Wireless data tranmission

 by waltr ¦  Mon Feb 16, 2015 9:48 am ¦  Forum: Wireless/RF ¦  Topic: Wireless data tranmission ¦  Replies: 5 ¦  Views: 1059

Nice progress.
Yes, please do a write up of the details.

I achieved this by creating a very simple Windows Service that monitors COM4 for incoming transmissions.
I didn't know this could be done. How is it done?

Re: Xbee s6B to PC

 by waltr ¦  Fri Feb 13, 2015 7:52 am ¦  Forum: Wireless/RF ¦  Topic: Xbee s6B to PC ¦  Replies: 4 ¦  Views: 993

Yes, you need Two to have an RF Link.
Sounds like you have NOT done the research required to use these. If you had you would not ask that question.
So go do goggle searches and do do a lot of reading.

Re: Name that mystery cable!

 by waltr ¦  Fri Feb 13, 2015 7:50 am ¦  Forum: Projects ¦  Topic: Name that mystery cable! ¦  Replies: 5 ¦  Views: 862

Yep, they are female to female servo cables typically used to connect an RC RX to a Multi-rotor Flight controller board.
Most places that sell RC gear have these in various lengths.
Pololu carries them and also carries the parts to make them.

Re: Xbee s6B to PC

 by waltr ¦  Tue Feb 10, 2015 8:02 am ¦  Forum: Wireless/RF ¦  Topic: Xbee s6B to PC ¦  Replies: 4 ¦  Views: 993

The XBee is a Wireless Link so for this you need two. If you do not need a wireless link then you do not need any XBee. An XBee is not the correct device to record data. It only has a very small serial data buffer (about 40 bytes). An Arduino with an SD card would be a reasonable choice for a data r...

Re: 4 wheel drive vehicle

 by waltr ¦  Mon Feb 09, 2015 8:47 am ¦  Forum: Projects ¦  Topic: 4 wheel drive vehicle ¦  Replies: 1 ¦  Views: 619

Go read the tutorials and forum at SoR (Society of Robots) for info on motor, drivers, etc.

Re: Wireless data tranmission

 by waltr ¦  Thu Feb 05, 2015 7:57 am ¦  Forum: Wireless/RF ¦  Topic: Wireless data tranmission ¦  Replies: 5 ¦  Views: 1059

Yes, what Steve said. Start with some simpler projects that build up to this one. And even when you get to this one keep the XBees out and use a direct connection from thw Arduino to the PC to get the sensor reading the data transfer code workking. Only after that step connect the XBees for a wirele...

Re: Problem connections for quadcopter.HELP ME!!!!

 by waltr ¦  Mon Feb 02, 2015 7:46 am ¦  Forum: Projects ¦  Topic: Problem connections for quadcopter.HELP ME!!!! ¦  Replies: 3 ¦  Views: 936

Both codlink and Mee_n_Mac are correct. Work on getting one sensor at a time working and you will need a level shifter for the I2C. You are also missing a very, very good resource. That is MultiWii code and boards. This is open source code based on the Arduino for MutliRotors. So go goggle MultiWii ...

Re: Rotational Encoder Recommendation

 by waltr ¦  Fri Jan 30, 2015 7:09 am ¦  Forum: Projects ¦  Topic: Rotational Encoder Recommendation ¦  Replies: 8 ¦  Views: 853

Is this one of those wheels with pins and a clicking tab that stops between pins? Then there are a finite number of positions. My idea is to put a code at each position that is then read by optical sensors. Painting the codes on the outside edge of the wheel (like lyndon suggests) should work. Then ...

Re: xbees pro series2B

 by waltr ¦  Thu Jan 29, 2015 8:02 am ¦  Forum: Wireless/RF ¦  Topic: xbees pro series2B ¦  Replies: 2 ¦  Views: 742

Go to the Digi Int web site and read the documents on the 2B.

Re: adxl335 accelerometer output values

 by waltr ¦  Wed Jan 28, 2015 12:42 pm ¦  Forum: SparkFun Product Questions ¦  Topic: adxl335 accelerometer output values ¦  Replies: 3 ¦  Views: 849

What are you using to measure the output Voltage?
The analog outputs on the adxl335 have an impedance of 32k Ohm and will not properly drive a ADC input. A high impedance DVM is ok but an op-amp buffer (Voltage follower) is required for any ADC including the ones inside of micro-controller chips.

Re: Pro Micro 5V and MPU-9150

 by waltr ¦  Wed Jan 21, 2015 7:39 am ¦  Forum: Arduino ¦  Topic: Pro Micro 5V and MPU-9150 ¦  Replies: 1 ¦  Views: 826

Run the Atmega processor from 5V (USB or a regulator) then use a 3.3V linear regulator to power the MPU9150. The next issue is the logic levels of the two chip on the I2C bus. For this use a FET level shifter, SparkFun has these. Using resistor dividers to power chips is a bad idea which can be un-s...

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