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
To: Model 100 Discussion
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
To: Model 100 Discussion
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
To: Model 100 Discussion
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" <[email protected]> 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
To: Model 100 Discussion
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 <[email protected]>
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
