Search found 1114 matches

by Roberthh
Tue Dec 11, 2018 3:18 pm
Forum: Programs, Libraries and Tools
Topic: Signal processing (main frequency)
Replies: 4
Views: 68

Re: Signal processing (main frequency)

Complex numbers seem to be enabled in the ESP32 build. But I never worked with them. Maybe @pythoncoder knows more. He usually reads the posts in the morning and late afternoon. I will not be able to test in on and ESP32 before tomorrow.
by Roberthh
Tue Dec 11, 2018 1:39 pm
Forum: Programs, Libraries and Tools
Topic: Signal processing (main frequency)
Replies: 4
Views: 68

Re: Signal processing (main frequency)

@pythoncoder has a fft script here: https://github.com/peterhinch/micropyth ... orithms.py
If you look around at that place, you'll find a lot of useful information.
by Roberthh
Tue Dec 11, 2018 12:00 pm
Forum: General Discussion and Questions
Topic: Micropython as Arduino killer
Replies: 18
Views: 635

Re: Micropython as Arduino killer

Ît cannot be said often enough:
The documentation of Micropython is good. It is reccomended for everyone to read it COMPLETELY even twice or thrice, to have an impression, what can be expected where is what. Thanks a lot to everyone who contributed, especially Paul, Damien, and Peter.
by Roberthh
Tue Dec 11, 2018 6:18 am
Forum: ESP32 boards
Topic: ESP32 and LoRa
Replies: 63
Views: 9291

Re: ESP32 and LoRa

Not at all. But I had quite a few troubles with cheap crap. Of the 6 or so generic ESP32 boards only the Sparkfun device works without problems. At that one is in the price range of a WiPy. The other five (Wemos) work more or less. Two of them required physical rework (bad soldering), another one is...
by Roberthh
Mon Dec 10, 2018 9:21 pm
Forum: ESP32 boards
Topic: ESP32 and LoRa
Replies: 63
Views: 9291

Re: ESP32 and LoRa

This is not a single place. There is a call to esp_get_revision() and esp_chip_info() in various places. You must change all places where esp_get_revision() and esp_chip_info() is called and hard code the '0' branch. Grep will tell you the places. The relevant files are main.c and mpthreadport.c and...
by Roberthh
Fri Dec 07, 2018 9:26 am
Forum: General Discussion and Questions
Topic: [Solved] Can't access REPL on macOS - Works on Windows
Replies: 13
Views: 183

Re: Can't access REPL on macOS - Works on Windows

The garbage at the startup is normal. The ESP8266 boot ROM send it first messages at a baud rate of about 74800 baud.
by Roberthh
Thu Dec 06, 2018 8:52 pm
Forum: General Discussion and Questions
Topic: [Solved] Can't access REPL on macOS - Works on Windows
Replies: 13
Views: 183

Re: Can't access REPL on macOS - Works on Windows

Ok. Has the terminal program settings for flow control, which could be set to none?
b.t.w.: which terminal programndo you use? For convenience I use picocom. screen seemed overfeatured for my purpose.
by Roberthh
Thu Dec 06, 2018 7:09 pm
Forum: General Discussion and Questions
Topic: [Solved] Can't access REPL on macOS - Works on Windows
Replies: 13
Views: 183

Re: Can't access REPL on macOS - Works on Windows

Did you search for a suitable driver for the USB/UART chip of the Wemos D1 Mini? It is a CH340G. I faintly recall that on my stone age OS-X laptop I once had to install a driver for the ch340 device. I have it on my machine, found it by googling. I have attached it. Most of the Zip is a one page PDF...
by Roberthh
Thu Dec 06, 2018 6:24 am
Forum: ESP8266 boards
Topic: Piezo Sensor + Wifi + Database
Replies: 7
Views: 225

Re: Piezo Sensor + Wifi + Database

Th eWemos D1 mini has a built-in resistor divider of 100k + 220k, which changes the analog range at the board level to 0-3.2V. This is intended as support for users, in your case it is bad. The impedance is way too low for a piezo sensor. You have either to use a buffer amplifier or remove the 100k ...
by Roberthh
Wed Dec 05, 2018 6:16 am
Forum: ESP32 boards
Topic: Flash Read Error on ESP 32 Board
Replies: 3
Views: 108

Re: Flash Read Error on ESP 32 Board

The target address for loading must be 0x1000, not 0, e.g. esptool.py -p com10 -c esp32 -b 460800 erase_flash esptool.py -p com10 -c esp32 -b 460800 write_flash --flash_size=detect 0x1000 file.bin For flashing, the speed can be higher. The default is 460800, but can indeed also be lower at the rates...