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1246  Community / Bar Sport / Re: What is the most challanging device that you have successfully soldered? on: March 31, 2013, 12:38:58 am
Mine was an LGA-14 (analog accelerometer). Bought them for fun because they were very cheap. Second try I managed to get it soldered on a home-etched board but it started smoking after about 10 minutes because of (I assume) some leftover flux under it.
1247  Topics / Robotics / Re: HS 311 only turns to the left on: March 28, 2013, 06:26:38 pm
You didn't mention the resistances in your voltage divider, but I suspect that they are too high to supply enough current (160ma no load requirement) to the servos. The linear regulator is a much much better choice.
1248  Using Arduino / Sensors / Re: Quadrotor prj using Angular Rate Sensors (ENC Series) --- Murata on: March 28, 2013, 11:51:49 am
No, you're going to need a board with both an accelerometer and gyro. The accelerometer is there so, via force of gravity, you can always get a zero point reference as to which direction is "down". If you need a zero point reference for yaw then you would also need a magnetometer.

1249  Topics / Robotics / Re: New to Arduino. Have To Complete A Robotic Challenge. Need Help? on: March 28, 2013, 01:59:59 am
So what have you done so far with your arduino?
...and where you given a robot platform or are you building from scratch?
1250  Topics / Robotics / Re: Advice For my university embeddded project radio control dog with animatronics on: March 28, 2013, 01:56:26 am
You want a 2.4GHz system; anything in the MHz range is antiquated.

If you're just looking for a straight up recommendation I'd point to the Turnigy 9x. You can find lots of reviews on this with a little searching; it's quite popular.
1251  Topics / Robotics / Re: HS 311 only turns to the left on: March 28, 2013, 01:45:35 am
i was using an e-flite 7.4 volt lipo with a voltage divider down to 4.8 volts

"A voltage divider" as in two resistors? Please explain.
1252  Using Arduino / Motors, Mechanics, and Power / Re: Non-blocking DC Motor? on: March 28, 2013, 01:40:04 am
See the BlinkWithoutDelay tutorial.
1253  Using Arduino / Sensors / Re: Quadrotor prj using Angular Rate Sensors (ENC Series) --- Murata on: March 28, 2013, 01:38:38 am
This is referred to as "gyro drift". I'm going to skip an explanation because I'd assuredly explain it poorly, but some Google searching will explain why you're seeing what you're seeing.

Also, the "50Hz" response means it takes 1/50th of a second to respond to the angular rate change -- it's the time it takes for the analog output voltage to match the angular rate of rotation. Or as another example, your fingers respond to heat at about 5Hz -- it takes you about a fifth of a second to realize what you're touching is hot smiley-wink
1254  Community / Bar Sport / Re: Idiot spammers on: March 28, 2013, 01:13:10 am
like millionaire death row prisoners who cant use a computer but are willing to fund opportunities if you just write them

Names? Numbers!?
1255  Using Arduino / Motors, Mechanics, and Power / Re: Servo PWM pins problem on: March 26, 2013, 02:58:39 am
Analog reads on one pin can also affect the read on another. The simple solution is to perform an analogRead, discard the value, then analogRead again.
1256  Using Arduino / Motors, Mechanics, and Power / Re: Electric Valve part question on: March 26, 2013, 02:55:18 am
That is described as a pneumatic valve which probably means it is suitable for turning a pressurised air system on, or off.    Not necessarily suitable for water.

Scroll down and it says it can be used for Air/Water/Oil/Gas.

For a more domestically accessible valve you can look into the valves used on dishwashers/etc. Most are 110V AC but you could still drive that easily enough with a relay.
1257  Using Arduino / Motors, Mechanics, and Power / Re: Motor Controllers for car seat motors? on: March 26, 2013, 02:45:32 am
See,134411.0 for a previous discussion on this board. dc42 points out that the driver is (or is equivalent to) the ST L9958 chip. That datasheet is now at

The SPI interface appears to be only necessary for diagnostics or setting the current limit. The DIR/PWM control seems pretty straightforward.

1258  Using Arduino / General Electronics / Re: routing power from solar source to consumers over a garden on: March 25, 2013, 05:09:44 pm
For 5V DC over 24 gauge copper (like the size in ethernet cables) for every 10 feet of distance you lose .01V at 20ma or .1V at 200ma. Hardly a concern.

1259  Using Arduino / Project Guidance / Re: construction Laser level for digger on: March 24, 2013, 12:45:58 pm
IR receivers are pretty tolerant when it comes to the pulse frequency.
1260  Topics / Product Design / Re: Itead, Members with Experience... on: March 23, 2013, 11:53:48 pm
GerbV ( works well for me on Linux. Have not used the Windows version but it's available.
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