#robotics Logs

Feb 09 2019

01:49 AM rue_mohr: so, I should be able to do this with a stm32
01:53 AM rue_mohr: I can see how the demodulation would work
01:53 AM rue_mohr: I wonder what the ADC can do on an stm32
02:13 AM mrdata-: stm32 is pretty capable
02:14 AM mrdata-: how many bits do you want from the ADC and at what sample rate?
02:15 AM mrdata-: rue_mohr, ^
02:31 AM rue_mohr: so, thinking on it, I have almost 138k sps off the floppy
02:31 AM rue_mohr: thats enough for stereo
02:31 AM rue_mohr: so two 40 - 44kHz channels doesn't sound unreasonable
02:31 AM rue_mohr: (two 69kHz channels)
02:56 AM flav0r: DUDES !
03:02 AM rue_mohr: I'm the only other guy here
03:59 AM flav0r: WELL HELLO TO YOU THEN !!
03:59 AM flav0r: whats new dude ????
05:16 AM squirrel1 is now known as veverak
06:21 AM veverak: hmmm
06:21 AM veverak: is there something better with power/weight ratio than lipo batteries?
06:22 AM veverak: speaking of up to 30g per battery
06:23 AM polprog: uranium cells
06:24 AM polprog: but they might be hard to get, except for some tiny ones
06:55 AM squirrel1 is now known as everak
06:55 AM everak is now known as veverak
07:14 AM flav0r: uranium is heavy
07:24 AM polprog: but you can get like 400GJ out of a kg
11:42 AM mrdata-: polprog, that little?
11:42 AM polprog: i looked that up on wikipedia
11:43 AM mrdata-: hmm... 400e9 / c^2 = 4.45e-6 kg of mass loss
11:48 AM mrdata-: polprog, it's too low
11:48 AM mrdata-: uranium fission has 80,620 GJ/kg
11:49 AM polprog: yeah
11:49 AM polprog: my bad, looks like someone on polish wikipedia made an error
11:50 AM polprog: i didnt feel like calculating that stuff
12:09 PM mrdata-: someone shilling for coal maybe
02:35 PM rue_mohr: http://ruemohr.org/~ircjunk/tutorials/elex/scanlessKeyboardDecoder/p1110264.jpg
02:35 PM rue_mohr: and gates aren't needed, it was to encoder the output a bit
02:35 PM rue_mohr: http://ruemohr.org/~ircjunk/tutorials/elex/scanlessKeyboardDecoder/p1110267.jpg
02:35 PM rue_mohr: adding 3 transistors and a resistor means you can completely skip matrix scanning code
02:58 PM logicmoo is now known as dmiles
04:24 PM rue_mohr: ok, made a little serial I/F tel. keypad, yay
09:02 PM rue_shop3: ok working on an idea I had for a pressure sensor
09:31 PM Tom_L: which is?
09:54 PM rue_shop1: measureing the deflection of a metal disc with as a variable capacitor
09:54 PM Tom_L: piezo
09:54 PM rue_shop1: no
09:54 PM rue_shop1: they drift