SparkFun will be closed Nov 26th and 27th for the Thanksgiving holiday. Orders placed after 2:00pm MT on the 25th will ship out Monday the 30th.


Member Since: March 25, 2008

Country: United States

  • So, Sparkfun is recommending that users use high power lasers without proper eye protection since lasers improve eyesight?

  • Exposing your eyes to high power laser light is not a good idea. I’d recommend using eye goggles specifically designed for blocking the wavelength being used that block light from the sides as well as the front. Get at least two pair as sooner or later someone else will want to safely watch. A video showing the CNC router cutting aluminum and showing the accuracy that is obtainable would be nice.

  • The fuel shutoff switch is also important during the start of a turbine engine. No fuel is to be delivered before the turbine is at the start RPM, with ignitors on. Otherwise the engine can start with a bang. (This is bad news when it happens.)

  • A LED’s light output is a function of the current flowing through it, not voltage applied to it. The voltage required to achieve a desired constant light level output from a LED varies with temperature. This is why driving them with a constant current source is a good idea.

  • Inserting a double length header and plugging it into a breadboard? Most breadboards would short out the odd and even pins on the connector as they are designed for .300" PDIP parts. Perhaps a PCB is in order to allow the header to be properly broke out on a breadboard.

  • Awesome event! However next year the airborne portion may need to be different due to the FAA’s recent reinterpretation of its rules.

    For those interested, here is a link: http://www.regulations.gov/#!documentDetail;D=FAA-2014-0396-0001

  • After a simple modification, he will never forget his safety glasses again!

  • Yes, it should work fine. Since you will be pointing the sensor upwards towards the sky you will want to protect it somehow from rain/dirt/etc.

    You could use a germanium window, but that is a bit costly. A window made of thin plastic wrap will keep moisture and dirt from falling on the sensor while being essentially transparent to the infrared. It will not be as durable as the germanium window however.

  • When you relocate the feedback pot, it is possible that the two end connections to the pot will need to be swapped. The reason for this is that depending on which side of the gear train you attach the pot from as well as the number of gears in the gear train may be different and could cause the final arrangement to differ in rotational sense than that in the original servo.

    If the rotational sense is different than the original, the servo motor would turn, which would cause the final shaft to turn as well as the pot, but in a direction that will set the pot to a voltage that is further not closer to the desired voltage. It will keep on turning in this direction until it hits a mechanical stop. If you hook it up this way and the pot has internal mechanical stops, the likely result will be a damaged pot unless you remove power before it hits the mechanical stop on the pot.

    Test the configuration by temporarily removing the gear which drives the pot. Then manually turning the pot in the direction the gear would be driven when the servo is commanded to change to a new position. This will determine if you need to swap the leads on the pot or not.

    If the motor stops before you hit the end limit on the pot, the sense is correct. If not, and it stops if you turn the pot in the opposite direction than the output gear would have turned the pot, you need to reverse the two outside leads on the pot.

    Hope this is not too confusing.

  • You short changed the processor speed on the Beaglebone Black a bit, it is 1 GHz, not 800 MHz. The product page has it correct.

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