I noticed no change in the power draw on my 102 when using the serial port, although it wasn't actually connected to another device. On Dec 9, 2015 1:06 AM, "John Whitton" <jwhit...@bellsouth.net> wrote:
> Mike, > > M102, and it was running its own monitoring program, that's how it (I) > knew run time. When it pooped out, the last time was recorded. It was, in > fact , monitoring its own battery voltage via an ADIOS. One might argue > that the RS-232 ate some power, but it was only OPENed when making a > measurement at 5 minute intervals, then closed. > > If you recall, I also (later) embedded an A/D in a M102, which can > measure both external voltages as well as monitor battery voltage. I could > run the same test now, without having to hook anything up at all. Cheesy > video of that: https://www.youtube.com/watch?v=HMV2HKwrCCc > > John W. > > ----- Original Message ----- > *From:* Mike Stein <mhs.st...@gmail.com> > *To:* Model 100 Discussion <m100@lists.bitchin100.com> > *Sent:* Wednesday, December 09, 2015 12:50 AM > *Subject:* Re: [M100] M100 power requirements > > Was this an M100 or a 102, and what if anything was it running? > > Looks like an app for the ADIOS ;-) > > m > > ----- Original Message ----- > *From:* John Whitton <jwhit...@bellsouth.net> > *To:* Model 100 Discussion <m100@lists.bitchin100.com> > *Sent:* Tuesday, December 08, 2015 11:04 PM > *Subject:* Re: [M100] M100 power requirements > > *?* > > Hmm. I do not recall, but I'm betting that the supply was tied to the > battery terminals, otherwise I would have had to make up a pigtail to use > the jack. I wouldn't bet my life on that... > > As an aside, I attach here a plot of battery voltage vs. time. This > was recorded using fully charged 2400mA NiMH batteries. Cutoff occured at > 1407 minutes. Note the abrupt knee at the end of the useful battery > charge/energy. That is characteristic of NiMH batteries. Alkalines have a > more gradual slope > > John W. > > > > ----- Original Message ----- > *From:* Josh Malone <josh.mal...@gmail.com> > *To:* Model 100 Discussion <m100@lists.bitchin100.com> > *Sent:* Tuesday, December 08, 2015 6:14 PM > *Subject:* Re: [M100] M100 power requirements > > Awesome, thank you. Any idea if this was measured with supply connected to > the dc jack or the battery terminals? > On Dec 8, 2015 5:53 PM, "John Whitton" <jwhit...@bellsouth.net> wrote: > >> FWIW, find attached a .pdf graph of M102 power consumption. This was >> compiled 6 years ago (hard to believe). >> >> John W. >> >> ----- Original Message ----- >> *From:* Josh Malone <josh.mal...@gmail.com> >> *To:* Model 100 Discussion <m100@lists.bitchin100.com> >> *Sent:* Tuesday, December 08, 2015 4:02 PM >> *Subject:* Re: [M100] USB "juice pack" >> >> I just tested the power requirements of my 102. With the battery >> connectors connected to a bench supply at 5 volts, it draws a very >> consistent 65mA. I was expecting the current to vary slightly with CPU or >> screen activity but it does not. I'm so used to CPU idle states which, of >> course, the 8085 does not use :) >> >> I have one of these kicking around at home ( >> https://www.sparkfun.com/products/10968) so I'm thinking to construct a >> LiPo-based AA battery replacement so I can recharge my 102 via USB. There's >> also https://www.sparkfun.com/products/11231 but that's capable of WAY >> more current than necessary and considerably more expensive. >> >> -Josh >> >> On Thu, Dec 3, 2015 at 7:00 PM, Mike Stein <mhs.st...@gmail.com> wrote: >> >>> >>> Yeah, I was wondering about that, especially with WiFi; definitely >>> sounds a little high. Too bad. >>> >>> Maybe Jeff's solution isn't such a bad idea after all ;-) >>> >>> Anyway, the M100 works fine on a "juice pack". >>> >>> m >>> >>> >>
