Search found 2823 matches

by waltr
Tue Mar 17, 2015 9:42 am
Forum: Projects
Topic: How to power a project w 12v rechargeable
Replies: 5
Views: 549

Re: How to power a project w 12v rechargeable

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.
by waltr
Thu Mar 12, 2015 8:11 am
Forum: Projects
Topic: Reflow Oven - Tune
Replies: 4
Views: 441

Re: Reflow Oven - Tune

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.
by waltr
Mon Feb 23, 2015 9:02 am
Forum: Projects
Topic: HighAltitudeBalloon: Testing array of temp/press/hum sensors
Replies: 1
Views: 341

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

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...
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: 1332

Re: ST VL6180X ToF range finder on Raspberry Pi

Nice trouble shooting, find and fix.
Thanks for posting.
by waltr
Mon Feb 16, 2015 9:48 am
Forum: Wireless/RF
Topic: Wireless data tranmission
Replies: 5
Views: 889

Re: Wireless data tranmission

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?
by waltr
Fri Feb 13, 2015 8:03 am
Forum: PIC Microcontrollers - Software and Hardware
Topic: PIC receive and transmit problem
Replies: 4
Views: 824

Re: PIC receive and transmit problem

Did you read the MAX232 Data Sheet????????????????????????????????????????????????????????? There are many variations of this chip and you MUST READ the data sheet and follow the info for the EXACT chip you have. Pay attention to the letters after the "232". Then use your Voltmeter to check the conv...
by waltr
Fri Feb 13, 2015 7:52 am
Forum: Wireless/RF
Topic: Xbee s6B to PC
Replies: 4
Views: 742

Re: Xbee s6B to PC

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.
by waltr
Fri Feb 13, 2015 7:50 am
Forum: Projects
Topic: Name that mystery cable!
Replies: 5
Views: 628

Re: Name that mystery cable!

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.
by waltr
Wed Feb 11, 2015 7:37 am
Forum: PIC Microcontrollers - Software and Hardware
Topic: PIC receive and transmit problem
Replies: 4
Views: 824

Re: PIC receive and transmit problem

The cap values is the problem.
These caps on the MAX232 are used for the internal Voltage Inverter and MUST be 10uF.
Go read the data sheet and app notes on using a MAX232.
by waltr
Tue Feb 10, 2015 8:02 am
Forum: Wireless/RF
Topic: Xbee s6B to PC
Replies: 4
Views: 742

Re: Xbee s6B to PC

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...
by waltr
Mon Feb 09, 2015 8:47 am
Forum: Projects
Topic: 4 wheel drive vehicle
Replies: 1
Views: 475

Re: 4 wheel drive vehicle

Go read the tutorials and forum at SoR (Society of Robots) for info on motor, drivers, etc.
by waltr
Thu Feb 05, 2015 7:57 am
Forum: Wireless/RF
Topic: Wireless data tranmission
Replies: 5
Views: 889

Re: Wireless data tranmission

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...
by waltr
Mon Feb 02, 2015 7:46 am
Forum: Projects
Topic: Problem connections for quadcopter.HELP ME!!!!
Replies: 3
Views: 758

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

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 ...
by waltr
Fri Jan 30, 2015 7:10 am
Forum: PIC Microcontrollers - Software and Hardware
Topic: Compiling question
Replies: 1
Views: 711

Re: Compiling question

Read the CC5X manual for the header requirements.
by waltr
Fri Jan 30, 2015 7:09 am
Forum: Projects
Topic: Rotational Encoder Recommendation
Replies: 8
Views: 572

Re: Rotational Encoder Recommendation

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 ...