Search found 155 matches

by danielm
Tue Mar 26, 2019 7:12 pm
Forum: ESP32 boards
Topic: powering ESP32 with a battery
Replies: 7
Views: 158

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: 7
Views: 158

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: 215

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: 215

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: 191

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: 191

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: 483

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...
by danielm
Sun Feb 10, 2019 5:52 pm
Forum: ESP32 boards
Topic: ESP32 PIN.OUT voltage
Replies: 11
Views: 282

Re: ESP32 PIN.OUT voltage

The pin cannot provide such current directly. I suggest to use high-side P-channel MOSFET to control the load (pump).
https://www.quora.com/When-is-it-good-t ... e-P-MOSFET

I usually use DMP2066 for switching of external components.
by danielm
Sun Feb 10, 2019 4:46 pm
Forum: ESP32 boards
Topic: ESP32 PIN.OUT voltage
Replies: 11
Views: 282

Re: ESP32 PIN.OUT voltage

What do you mean by "pump" and what is its maximum input current?