Search found 121 matches
- Fri Jun 21, 2019 5:38 am
- Forum: ESP8266 boards
- Topic: Only power sensor when not in deep sleep
- Replies: 9
- Views: 6664
Re: Only power sensor when not in deep sleep
Jep, get an ESP Module with more Pins. ESP32 modules are not expensive!
- Thu Jun 20, 2019 8:14 pm
- Forum: ESP8266 boards
- Topic: Only power sensor when not in deep sleep
- Replies: 9
- Views: 6664
Re: Only power sensor when not in deep sleep
Why don‘t you use a simple GPIO Pin with a relay? On startup the Pin goes high and the relay (driven through a transistor) switches Power to the Sensor. On deepsleep the Pin goes into high impedance and the relay switches off. Maybe you can also use a FET directly instead of the relay.
- Wed May 22, 2019 11:58 am
- Forum: ESP32 boards
- Topic: Power consumption of TTGO T8 Board
- Replies: 15
- Views: 9520
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...
- Wed May 22, 2019 11:48 am
- Forum: ESP32 boards
- Topic: Power consumption of TTGO T8 Board
- Replies: 15
- Views: 9520
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
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
- Wed May 22, 2019 4:53 am
- Forum: micro:bit boards
- Topic: convert js to python for micro:bit
- Replies: 2
- Views: 3594
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...
- Wed May 22, 2019 4:51 am
- Forum: General Discussion and Questions
- Topic: double precision float on ESP8266
- Replies: 30
- Views: 19502
Re: double precision float on ESP8266
Phew, okay that sound resonable!
Just ask if you have any problems building the firmware!
Just ask if you have any problems building the firmware!
- Tue May 21, 2019 7:48 pm
- Forum: General Discussion and Questions
- Topic: double precision float on ESP8266
- Replies: 30
- Views: 19502
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.
I think most calculation are accurate enough with single precision floating point.
- Tue May 21, 2019 3:00 pm
- Forum: General Discussion and Questions
- Topic: double precision float on ESP8266
- Replies: 30
- Views: 19502
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.
- Tue May 21, 2019 1:40 pm
- Forum: ESP32 boards
- Topic: Power consumption of TTGO T8 Board
- Replies: 15
- Views: 9520
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.
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.
- Tue May 21, 2019 6:21 am
- Forum: ESP32 boards
- Topic: Power consumption of TTGO T8 Board
- Replies: 15
- Views: 9520
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...
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...