Search found 9 matches
- Mon Nov 16, 2020 2:21 pm
- Forum: Drivers for External Components
- Topic: How to generate a square wave chirp?
- Replies: 4
- Views: 4335
Re: How to generate a square wave chirp?
I looked through your multiaxis.py code for GPIO. It looks like you are using constant acceleration, so there is still jerk. I will try it out and see if I am happy with the result.
- Mon Nov 16, 2020 2:22 am
- Forum: Drivers for External Components
- Topic: How to generate a square wave chirp?
- Replies: 4
- Views: 4335
Re: How to generate a square wave chirp?
Thank you, Oliver. I thought there must be relevant information on the forum, but I could not find it.
- Fri Nov 13, 2020 8:13 pm
- Forum: Drivers for External Components
- Topic: How to generate a square wave chirp?
- Replies: 4
- Views: 4335
How to generate a square wave chirp?
I am using a pyboard to control a linear stage (aka positioning table). The stage has a step motor with an integrated driver, so the interface is via TTL inputs for clock, direction, on/off, and stepsize. The 5V tolerance of the pyboard made it the best, albeit pricey choice for the controller. For ...
- Thu May 21, 2020 2:33 am
- Forum: General Discussion and Questions
- Topic: ADC performance of MicroPython boards
- Replies: 12
- Views: 21392
Re: ADC performance of MicroPython boards
Here is a sawtooth sampled with ESP32. Note the non-linearity: ESP32.png The same looks better (more linear and less noisy) on the ESP8266 ESP8266.png But in both cases there are periodic outliers. One could probably run slightly faster by optimizing the code. I simply used: for i in range(1000): da...
- Wed Apr 08, 2020 4:10 pm
- Forum: Pyboard D-series
- Topic: High Speed USB PHY
- Replies: 7
- Views: 7640
- Wed Apr 08, 2020 3:56 pm
- Forum: General Discussion and Questions
- Topic: ADC performance of MicroPython boards
- Replies: 12
- Views: 21392
Re: ADC performance of MicroPython boards
The PyBoard's ADC.read.timed() should not have jitter since it's timer based. But because it's blocking you cannot use it for sustained data logging. For an oscilloscope-like application where you only need one trace at a time it should be sufficient however. Can anyone with a D-series PyBoard and/o...
- Thu Jan 19, 2017 2:36 am
- Forum: ESP8266 boards
- Topic: howto: Flash MicroPython with nodemcu flasher and connect with putty on Windows
- Replies: 12
- Views: 25405
Re: howto: Flash MicroPython with nodemcu flasher and connect with putty on Windows
For me it works:
MicroPython v1.8.7-7-gb5a1a20a3 on 2017-01-09; ESP module with ESP8266
Type "help()" for more information.
>>> os.listdir()
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
NameError: name 'os' is not defined
>>> import os
>>> os.listdir()
['boot.py']
>>>
MicroPython v1.8.7-7-gb5a1a20a3 on 2017-01-09; ESP module with ESP8266
Type "help()" for more information.
>>> os.listdir()
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
NameError: name 'os' is not defined
>>> import os
>>> os.listdir()
['boot.py']
>>>
- Wed Jan 18, 2017 4:12 am
- Forum: ESP8266 boards
- Topic: howto: Flash MicroPython with nodemcu flasher and connect with putty on Windows
- Replies: 12
- Views: 25405
Re: howto: Flash MicroPython with nodemcu flasher and connect with putty on Windows
It appears after flashing my ESP8266 with microPython the serial port speed is 115200 (8N1 no flow control).
I went through all other speeds and only 115200 worked. nodeMCU was more forgiving...
A reset still produces a chunk of garbage but then I get the Python prompt.
I went through all other speeds and only 115200 worked. nodeMCU was more forgiving...
A reset still produces a chunk of garbage but then I get the Python prompt.
- Tue Jan 17, 2017 2:10 pm
- Forum: ESP8266 boards
- Topic: howto: Flash MicroPython with nodemcu flasher and connect with putty on Windows
- Replies: 12
- Views: 25405
Re: howto: Flash MicroPython with nodemcu flasher and connect with putty on Windows
Hi there, I believe I bought the same board on Amazon listed as "HiLetgo NodeMCU LUA WiFi Internet ESP8266 Development Board ESP-12E" I installed the Silicon Labs CP210x driver and flashed my board with esp8266-20161110-v1.8.6.bin using the nodeMCU tool (ESP8266Flasher.exe) just as you did and all l...