Search found 113 matches

by ThomasChr
Sat Jun 22, 2019 6:37 am
Forum: ESP32 boards
Topic: ESP32 + 110 ws2812b = random lighting
Replies: 4
Views: 191

Re: ESP32 + 110 ws2812b = random lighting

Maybe it‘s time to put the Logic Analyser into good use. You can get one for up to 10 MHz in China (salea logic clone) for a few bucks.
It can tell you exactly what voltages/commands the LEDs see.
by ThomasChr
Fri Jun 21, 2019 7:44 am
Forum: ESP8266 boards
Topic: Only power sensor when not in deep sleep
Replies: 9
Views: 259

Re: Only power sensor when not in deep sleep

I think this is one of the smallest formfactors for the ESP32: Directly the module WROVER from Espressif! https://www.aliexpress.com/item/33006996531.html Bonus: It's got 4 MB of PSRAM. Thats a lot of memory for micropython. On the negative side: It needs a regulated power source of about 3 / 3.3 Vo...
by ThomasChr
Fri Jun 21, 2019 5:38 am
Forum: ESP8266 boards
Topic: Only power sensor when not in deep sleep
Replies: 9
Views: 259

Re: Only power sensor when not in deep sleep

Jep, get an ESP Module with more Pins. ESP32 modules are not expensive!
by ThomasChr
Thu Jun 20, 2019 8:14 pm
Forum: ESP8266 boards
Topic: Only power sensor when not in deep sleep
Replies: 9
Views: 259

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.
by ThomasChr
Wed May 22, 2019 11:58 am
Forum: ESP32 boards
Topic: Power consumption of TTGO T8 Board
Replies: 15
Views: 534

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: 534

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: 253

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: 29
Views: 904

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: 29
Views: 904

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: 29
Views: 904

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.