# gallamine

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bio website robotbox.net location North Carolina age member for 2 years, 11 months seen Sep 10 at 22:05 profile views 53

I build robots.

# 91 Actions

 Apr15 awarded Popular Question Jan2 awarded Yearling Dec20 awarded Popular Question Dec3 awarded Popular Question Nov16 awarded Necromancer Apr10 accepted Rotating a gyroscope's output values into an earth-relative reference frame Apr9 comment Rotating a gyroscope's output values into an earth-relative reference frame I assume that the .x, .y, and .z components are the 1st, 2nd, and 3rd components of the different vectors? Conceptually, this just seems so easy. Why would you ever opt to do a complicated rotation matrix as opposed to just projecting the vectors? Apr8 comment Rotating a gyroscope's output values into an earth-relative reference frame Thanks Rocketmagnet! That does help. Let me see if I've got this: Effectively you're creating a matrix M, [V.x V.y V.z; H1.x H1.y H1.z; H2.x H2.y H2.z] and multiplying that by the gyro vector, [Gx Gy Gz]^T, which gives you the gyro vector referenced in the NEW coordinate frame, [GV GH1 GH2]? The vertical vector, V, is given because we have an accelerometer that outputs the (negative) gravity vector . The other two vectors are normal to the gravity vector, and hence define the "earth" coordinate frame. Apr7 revised Rotating a gyroscope's output values into an earth-relative reference frame Clarified earth frame. Apr7 comment Rotating a gyroscope's output values into an earth-relative reference frame Jeff, you're right. It is confusing. I'll clarify. Apr7 asked Rotating a gyroscope's output values into an earth-relative reference frame Jan12 answered looking for a sensor that activates when hit by a certain frequency burst Jan11 comment Can a computer monitor output light invisible to the human eye? @RussellMcMahon you're probably correct. I can't find my spectrometer, or else I'd take a measurement now. It wasn't clear to me whether the OP was asking about whether the display intentionally could source non-visible light, or they were just asking if it were possible. Jan11 comment Short Distance sensitive laser range finder Regarding speed: This could affect the ultrasonic via doppler shift. He doesn't necessarily mean it needs to sample quickly. Regarding precision: that might be an issue, but it's not clear from the OP. I don't see the need for a downvote :( Jan11 answered Can a computer monitor output light invisible to the human eye? Jan11 awarded Benefactor Jan11 answered Short Distance sensitive laser range finder Jan10 comment Driving an LED/Laser diode with a RF signal up to 20 MHz @OlinLathrop is there a particular Q1 that'd you'd recommend? Thanks! Jan9 comment Driving an LED/Laser diode with a RF signal up to 20 MHz Cree doesn't design them for communication, just illumination. They have, however been successfully used for 10 Mbps baseband communication, 80 Mbps with equalization, and I have tested their RF response up to 15 MHz. Can provide references if you'd like. I'm more concerned about driving the laser diode. Jan9 comment Driving an LED/Laser diode with a RF signal up to 20 MHz @OlinLathrop I need to dive my diode laser with a bias of 125 mA and a maximum signal of +/- 75 mA.