Search found 109 matches

by ThomasChr
Wed May 22, 2019 11:58 am
Forum: ESP32 boards
Topic: Power consumption of TTGO T8 Board
Replies: 15
Views: 425

Re: Power consumption of TTGO T8 Board

Not much :-) The ESP32 still works fine, but without a power IC you need to power the 3.3V rail directly. Which is not that bad because it accepts between 2.3V and 3.6V. The USB2serial Chip is gone, so no USB anymore. And after removing the pullups for the SD Card I'm not quite sure if the SD Card w...
by ThomasChr
Wed May 22, 2019 11:48 am
Forum: ESP32 boards
Topic: Power consumption of TTGO T8 Board
Replies: 15
Views: 425

Re: Power consumption of TTGO T8 Board

I just blowed some resistors of the board and this is the outcome:

Without voltage regulator (providing 3.3V directly on the rail): 100 µA
Without the Voltage Divider from the Power IC: 90 µA
Without the pullups for the SD Card IO Lines: 5 µA

So I think I'm pretty much done :-)
by ThomasChr
Wed May 22, 2019 4:53 am
Forum: micro:bit boards
Topic: convert js to python for micro:bit
Replies: 2
Views: 215

Re: convert js to python for micro:bit

Converting javascript to python is no easy task and I doubt that there is a tool for that apart of your own brain...
by ThomasChr
Wed May 22, 2019 4:51 am
Forum: General Discussion and Questions
Topic: double precision float on ESP8266
Replies: 18
Views: 488

Re: double precision float on ESP8266

Phew, okay that sound resonable!

Just ask if you have any problems building the firmware!
by ThomasChr
Tue May 21, 2019 7:48 pm
Forum: General Discussion and Questions
Topic: double precision float on ESP8266
Replies: 18
Views: 488

Re: double precision float on ESP8266

Just a question: Why do you think you need double precision?
I think most calculation are accurate enough with single precision floating point.
by ThomasChr
Tue May 21, 2019 3:00 pm
Forum: General Discussion and Questions
Topic: double precision float on ESP8266
Replies: 18
Views: 488

Re: double precision float on ESP8266

Hardware floating point only means "floating point in hardware". Micropython can do any floating point in software. This will be considerably slower for a CPU, but as a human you won't notice any difference in speed.
by ThomasChr
Tue May 21, 2019 1:40 pm
Forum: ESP32 boards
Topic: Power consumption of TTGO T8 Board
Replies: 15
Views: 425

Re: Power consumption of TTGO T8 Board

Hi matty,

thats exactly why I ordered some of those TinyPICOs :-)

Cheap chinese development boards haven't got poer efficency in mind!

I'll try blowing of some resistores and will post the outcome here.
by ThomasChr
Tue May 21, 2019 6:21 am
Forum: ESP32 boards
Topic: Power consumption of TTGO T8 Board
Replies: 15
Views: 425

Re: Power consumption of TTGO T8 Board

Blowing the power IC off was a success. I'm down to 100 µA.
Any suggestions what I can try next? The ESP32 should go down to about 10 µA, so there must be still something which is drawing a tiny bit of power...
by ThomasChr
Mon May 20, 2019 8:35 pm
Forum: ESP32 boards
Topic: Power consumption of TTGO T8 Board
Replies: 15
Views: 425

Re: Power consumption of TTGO T8 Board

I‘ll try it tomorrow and will report the outcome here!
by ThomasChr
Mon May 20, 2019 8:19 pm
Forum: ESP32 boards
Topic: Power consumption of TTGO T8 Board
Replies: 15
Views: 425

Re: Power consumption of TTGO T8 Board

So blowing the power IC off the board could help?