#avr Logs

Jun 15 2020

02:46 AM rue_bed: I agree arduino libraries suck
09:16 AM rue_mohr: pickey things
09:17 AM rue_mohr: like "its not ok to play the header of a wav file as audio"
09:19 AM skz81: rue_mohr, we were discussing about lab resistor lately in the office. What's the power your resistor box can handle ?
09:19 AM rue_mohr: its all done with 1/4w resistors, but if it heats up it would go out badly
09:21 AM skz81: Ho ? I would have guessed you designed something more beefy
09:21 AM rue_mohr: dont need it
09:21 AM rue_mohr: the target is things like oscillators and analog amps
09:21 AM rue_mohr: and filters
09:21 AM skz81: Hum ok. Precision is more a target then
09:22 AM rue_mohr: I put the resistors on modules, if I burn one up, its easier to change them
09:22 AM rue_mohr: the relays are 1A
09:23 AM rue_mohr: it has provisions for a cooling fan, but I didn't put one in
09:27 AM skz81: rue_mohr, understandable, thanks for the info. Dunno why I came to think that was a power electronics contraption :)
09:34 AM rue_mohr: it could have been
09:34 AM rue_mohr: I have a programmable load bank
09:34 AM rue_mohr: its good for a few hundred watts
02:42 PM markasoftware: I want to hold Avcc a few tenths of a volt below Vcc. Will this cause any harm?
02:42 PM markasoftware: for atmega88pa
02:42 PM markasoftware: all the signals I want to measure are relative to avcc
02:51 PM cehteh: thats not the way you do int
02:51 PM cehteh: thats not the way you do it
02:51 PM cehteh: avcc is only a dedicated pin to be able to add a noise filter iirc it should be not different to VCC (read datasheet)
02:52 PM cehteh: reference voltage should be applied to AREF ... but only when you make sure you really configure it correct, putting 4V to AREF and configure it to be VCC or internal bandgap may do harm
02:53 PM cehteh: configure AREF for external reference
05:52 PM strata_ is now known as strata
11:14 PM markasoftware: ok
11:14 PM markasoftware: I want to use an RC filter instead of an LC filter for Avcc, but this means there will be some voltage drop between the two over the resistor
11:14 PM markasoftware: and I want to know if that is ok
11:22 PM markasoftware: apparently Avcc can be within +-0.3 volts safely
11:24 PM cehteh: no its not ok
11:25 PM cehteh: better use no filter at all then
11:26 PM cehteh: add one extra 100nF cap to AVCC and good
11:26 PM cehteh: but what hold you back from getting a small inductor?
11:27 PM day_ is now known as day