[DM15L] USB Power?

Discussion of hardware issues related to the DM1x/DM41. Please ensure that you specifiy whether the issue is related to a credit card size unit or a "Voyager" unit (DM1xL/DM41L).
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Boub65
Posts: 65
Joined: Tue Sep 12, 2017 2:34 pm
Location: Rabat, Morocco

[DM15L] USB Power?

Post by Boub65 » Fri Dec 01, 2017 11:25 pm

Hi all,
I want to crunch numbers with my DM15L and I need the power to last more than what the battery can give.

Can I use USB port to power the DM15L while it is "running" ?

Sincerely,
Boubker.
2xDM15L, DM41L
DM42 SN#00855

Michael
Site Admin
Posts: 208
Joined: Wed Apr 05, 2017 9:31 pm

Re: [DM15L] USB Power?

Post by Michael » Fri Dec 01, 2017 11:32 pm

Sorry, the USB juice does not power the CPU of the DM15L.

keithdalby
Posts: 472
Joined: Mon Apr 24, 2017 6:38 pm

Re: [DM15L] USB Power?

Post by keithdalby » Sat Dec 02, 2017 7:33 am

Should be possible to 3D print a plastic CR2032 and add two electrodes to it, then power it from an external supply though? Or perhaps some easier solution involving crocodile/alligator clips and a power supply?

Edit: googled it, http://shelleybhomeandholiday.com/magic ... -set-of-2/
Last edited by keithdalby on Sat Dec 02, 2017 7:36 am, edited 1 time in total.

Michael
Site Admin
Posts: 208
Joined: Wed Apr 05, 2017 9:31 pm

Re: [DM15L] USB Power?

Post by Michael » Sat Dec 02, 2017 7:57 am

If soldering is an option, I would use a 2*AA battery holder like this:
Image
Then solder the negative black wire to the USB connector and the positive red wire to the top of the CR2032 battery holder on the PCB.

rprosperi
Posts: 331
Joined: Mon Apr 24, 2017 5:48 pm
Location: New York

Re: [DM15L] USB Power?

Post by rprosperi » Sat Dec 02, 2017 2:59 pm

Boub65 wrote:
Fri Dec 01, 2017 11:25 pm
I want to crunch numbers with my DM15L and I need the power to last more than what the battery can give.
If your needed calculations require more than the DM15L can provide on an entire battery, then perhaps you have chosen the wrong tool for the job. As awesome and fast as the DM15L is, it certainly isn't the right tool for every numerical task. If your solution absolutely must be handheld, the HP Prime is likely the most powerful handheld calculator made, maybe you should check it out.
--bob p

DM42: β00071 & 00282

Boub65
Posts: 65
Joined: Tue Sep 12, 2017 2:34 pm
Location: Rabat, Morocco

Re: [DM15L] USB Power?

Post by Boub65 » Sat Dec 02, 2017 3:28 pm

It's not an issue... just asking...

When I am away from my desk, I have my DM15L (or DM41L) and always an USB battery pack... and I don't have an HP Prime...
My next 200€ will definitely go to the DM42 😀

Just my .02€ to improve already GREAT products :
- May be next HW version of DMxxL could also be powered from USB? 👍
- May be next SW version of DM15L could manage alarms (there already is a clock and a buzzer and the code may already exist from DM41L)? 👍

Sincerely,
Boubker.
2xDM15L, DM41L
DM42 SN#00855

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