HackerTrans
TopNewTrendsCommentsPastAskShowJobs

berikv

no profile record

Submissions

How far can I broadcast LoRa packets WITHOUT a radio?

youtube.com
1 points·by berikv·12 माह पहले·0 comments

comments

berikv
·2 माह पहले·discuss
Badger Badger Badger originally is a flash animation. To properly archive this, both the flash animation and a machine definition which can run that animation (eg: having a browser with flash plugin) should be stored, not just a video file.
berikv
·9 माह पहले·discuss
“Then there is the % address operator: user %domainB@domainA is first sent to domainA, which expands the rightmost (in this case, the only) percent sign to an @ sign. The address is now user@domainB, and the mailer happily forwards your message to domainB, which delivers it to user. This type of address is sometimes referred to as “Ye Olde ARPAnet Kludge,” and its use is discouraged“
berikv
·पिछला वर्ष·discuss
Please don’t terrify your contractors. They fix your place, and you want them on your side doing a good job.
berikv
·पिछला वर्ष·discuss
This should be my new screensaver
berikv
·पिछला वर्ष·discuss
Also: Fix every bug twice: Both the implementation and the “call site” — if at all possible
berikv
·पिछला वर्ष·discuss
Personally, I’d start with divide and conquer. If you’re working on a relevant code base chances are that you can’t learn all the API spec and documentation because it’s just too much.
berikv
·2 वर्ष पहले·discuss
Correcting the correction:

> When you connect 2 9000 mAh cells in series, the resulting battery has 2x the voltage but the same mAh capacity. In parallel, the battery has the same voltage but 2x the mAh.

The relevant units are:

* Capacity (Q, in mAh, Ah, kWh, etc)

* Power (P, in Watts)

* Voltage (U, in Volts)

* Current (I, in Amperes)

* Duration (t, in mostly measured in hours)

And the relevant formulas are:

* P = U x I or Power equals Voltage(difference) times Current

* Q = P x t or Capacity equals Power times duration

From this we can establish that connecting batteries in series or in parallel will not change their Capacity. When having 13 batteries of 29000mAh, or 29Ah, you have 13 x 29 = 377Ah or 377000mAh. Connecting batteries in series or parallel does make a difference in voltage and current: a string in series will increase the voltage while keeping the current the same (theoretically, in practice you get less than the current of the weakest cell); a parallel setup will increase the maximum current while keeping the voltage the same (again, in theory).