Search found 157 matches

by danielm
Thu Mar 28, 2019 12:12 pm
Forum: ESP32 boards
Topic: powering ESP32 with a battery
Replies: 12
Views: 713

Re: powering ESP32 with a battery

We are currently using FANSO ER26500M in our devices (max continuous current 1500mA). There is also AA-sized FANSO ER14505M (max continuous current 400mA). Try to look for similar products from brands like EVE, Saft, Xeno. We are sourcing the batteries from https://www.tme.eu/en/ Not sure if they sh...
by danielm
Wed Mar 27, 2019 7:25 am
Forum: ESP32 boards
Topic: powering ESP32 with a battery
Replies: 12
Views: 713

Re: powering ESP32 with a battery

Just be careful and check max continuous and peak currents of selected cell in case of LiSOCl2. Look for so-called "spiral" type which has special internal construction and is able to provide higher currents, this is important for devices with radio communication interfaces. In case of LiMnO2 always...
by danielm
Tue Mar 26, 2019 7:12 pm
Forum: ESP32 boards
Topic: powering ESP32 with a battery
Replies: 12
Views: 713

Re: powering ESP32 with a battery

Primary battery means non-rechargeable. But they have quite high capacity in comparison to rechargeable Lithium chemistries (e.g. 2Ah for high performance AA cell with price around 3EUR or D cell with 14Ah for approx. 8-10EUR).
by danielm
Tue Mar 26, 2019 8:54 am
Forum: ESP32 boards
Topic: powering ESP32 with a battery
Replies: 12
Views: 713

Re: powering ESP32 with a battery

A note regarding long-running battery powered applications - do not forget to take into consideration self-discharge of rechargeable batteries (accumulators). It is roughly 50% per year, depending on battery chemistry. This is why applications which are expected to run for years without battery repl...
by danielm
Sat Mar 02, 2019 11:28 am
Forum: Other Boards
Topic: New MaixPy update, support KPU, openMV~
Replies: 4
Views: 386

Re: New MaixPy update, support KPU, openMV~

Thanks for update, just to clarify - release of 0.2.2 is planned on 3.4. or 3.3.?
by danielm
Sat Mar 02, 2019 7:39 am
Forum: Other Boards
Topic: New MaixPy update, support KPU, openMV~
Replies: 4
Views: 386

Re: New MaixPy update, support KPU, openMV~

Are you planning to release MAIXPY beta 0.2.0 on GitHub?
by danielm
Fri Mar 01, 2019 5:41 pm
Forum: Programs, Libraries and Tools
Topic: ESP32FLASHWRITER
Replies: 5
Views: 315

Re: ESP32FLASHWRITER

It seems that module termios is not available on Windows:
"Because it requires the termios module, it will work only on Unix."
https://docs.python.org/3/library/tty.html
by danielm
Fri Mar 01, 2019 8:38 am
Forum: Programs, Libraries and Tools
Topic: ESP32FLASHWRITER
Replies: 5
Views: 315

Re: ESP32FLASHWRITER

Is it possible to build portable executable for Windows with all dependencies included?
by danielm
Mon Feb 25, 2019 6:07 pm
Forum: ESP32 boards
Topic: New ESP32 development board DMtech DEV01 with NB-IoT interface
Replies: 5
Views: 675

Re: New ESP32 development board DMtech DEV01 with NB-IoT interface

The board exists in its first iteration which works quite well but needs some slight modifications. It would also be good to perform antenna impedance matching circuit tuning before mass production. Anyway NB-IoT interface works well with default values as well. The values are sourced from antenna d...