#avr Logs

Feb 09 2019

12:09 AM cehteh: no
12:19 AM nabil: What are you guys using as a replacement for GPRS? (please tag me when responding)
01:17 AM rue_mohr: "marco, polo"
03:17 AM jancoow: cehteh: hey
03:29 AM nohit: WAP
03:57 AM jancoow: wap?
05:04 AM jancoow: cehteh: hey are you there? :D
12:47 PM rue_mohr: I'm here
12:47 PM rue_mohr: are you there?
12:52 PM HighInBC: here
01:07 PM nohit: im here
01:15 PM rue_mohr: I'm back
01:51 PM nohit: new meds?
02:11 PM rue_mohr: nope
02:13 PM vmt: --
05:54 PM rue_shop3: hmm I wonder what I could use as an easy interface to an LED bargraph
06:04 PM cehteh: bidir schift register?
06:04 PM rue_shop3: why bidir?
06:05 PM cehteh: then you only increment/decrement
06:05 PM cehteh: instead update the whole thing
06:05 PM cehteh: well any normal shift register would do
06:05 PM cehteh: how many leds?
06:05 PM rue_shop3: 8
06:06 PM cehteh: so just shift register and done
06:06 PM LeoNerd: Honestly, I'd just stick them on a 74'595 chain on SPI and be done with it
06:07 PM cehteh: could also be charlieplexed
06:07 PM rue_shop3: hm
06:10 PM rue_shop3: hmm, the building supplies store will close in a half hour
06:10 PM cehteh: iirc there are special bargraph driver IC's
06:11 PM LeoNerd: They're usually sets of analog comparators and so on, driving from an analog source
06:11 PM cehteh: dunno if easily available but back in the 80's 90's every reasonable HiFi has bargraphs :D
06:11 PM cehteh: so you need and DAC :)
06:12 PM cehteh: goal: drive bargraph LED in the most obtrusvie way
06:14 PM cehteh: well it boils don what you have for spare: pins, clock cycles, program space ...
06:14 PM cehteh: hving one pin per led would be easiest on clock and program space
07:04 PM rue_mohr: LM3914
07:04 PM rue_mohr: but not what I want ofr driving a microcontroller
07:04 PM rue_mohr: but, I wonder
07:08 PM cehteh: actually driven by pwm w/ lowpass might be pretty decent needs only one pin and signal is generated in hardware
07:08 PM cehteh: when you have a free pwm channel that can be the best thing
07:09 PM cehteh: little code, 1 pin, almost no clock cycles ... best of all
07:12 PM rue_mohr: yea, I was thinking that, with a 595 and maybe 74--14
11:30 PM day_ is now known as day