#robotics Logs

Aug 05 2015

08:42 rue_school its wed...
08:43 rue_school k
08:43 Jak_o_Shadows yeah. time goes too fast
08:43 rue_school not fast enough in my case, feels like there have been about 9 days so far this week
08:44 Jak_o_Shadows Well, this week feels slow for me, but time in general
08:44 Jak_o_Shadows also, rue_school?
08:45 rue_school yup
08:45 rue_school I have a trade school pointing out what I dont know about reactive power and phase angles in RLC circuits
08:46 Jak_o_Shadows ah, cool.
08:46 Jak_o_Shadows Yeah, I don't think i'm going to pick up proper electronics for quite a while.
08:46 Jak_o_Shadows if at all
09:01 rue_school apparently I'm having issue with complex impedences in parallel
11:13 adv_ is there a more appropriate channel to ask about gyro/accelerometer values?
11:31 SpeedEvil adv_: possibly - depending on why
11:32 adv_ SpeedEvil: i want to interpret how fast a user does 'air guitar strumming'
11:32 adv_ and i have lots of acc/gyro/orientation data
11:33 SpeedEvil Waht is the issue?
11:35 adv_ SpeedEvil: i don't know how to make sense of all these floatiing point values
11:35 adv_ *floating
11:36 adv_ i want to combine that data in order to get a reading from 1-10 (1 slowest strumming, 10 fastest strumming)
11:39 SpeedEvil The nuclear option is to feed them into a kalman filter
11:40 SpeedEvil this gets you a (slightly drifty) x/y/z roll-pitch-yaw output
11:41 adv_ SpeedEvil: is there a howto for this?
11:55 deshipu low-pass and high-pass filters
11:55 deshipu I suppose
11:55 deshipu would be the first thing to try
11:55 deshipu so, one of the simplest low-pass filters is running average
11:56 deshipu you just average the signal over the last, say, 100 readings
11:56 deshipu for a high-pass filter, take your signal and subtract the average from it
11:57 deshipu now, by combininig low-pass and high-pass filters over different time spans, you can react only to changes in the certain frequency band
11:57 deshipu does that make sense?
16:48 rue_school basically nothing new to learn today
16:48 rue_school I desomated a problem solving a resistor based dc circuit
16:48 rue_school so
16:48 rue_school going to go buy unimportant things, like CAN OPENERS
16:49 rue_school so i can GET INTO THE CANS OF FOOD I BOUGHT
16:50 rue_school oh I didn't bring a sweater
16:50 rue_school huh
16:50 rue_school .....