Search found 348 matches

by blmorris
Sun Dec 06, 2015 4:24 pm
Forum: MicroPython pyboard
Topic: Ideas for next evolution of pyboard
Replies: 75
Views: 34498

Re: Ideas for next evolution of pyboard

One argument against the Arduino footprint is that it is much larger than the current pyboard; one of the nice things about the pyboard is the amount of IO contained in a compact size, and many suggestions here have been for pyboards that are even smaller. Arduino compatible footprints bring us in t...
by blmorris
Sun Dec 06, 2015 4:17 am
Forum: MicroPython pyboard
Topic: Ideas for next evolution of pyboard
Replies: 75
Views: 34498

Re: Ideas for next evolution of pyboard

One thing that I haven't seen on a commonly available STM32F4 dev board is a ULPI PHY ( example: the USB3300 from Microchip ) to provide a true HS USB interface. Many chips in the STM32F4xx family support it, and on the higher pin-count devices it wouldn't preclude access to most other peripherals. ...
by blmorris
Sat Nov 14, 2015 4:09 am
Forum: General Discussion and Questions
Topic: Pyboard and linear ccd sensor(TSL 1410R)
Replies: 17
Views: 7498

Re: Pyboard and linear ccd sensor(TSL 1410R)

Vitali - looks like you have it working! Those plots are pretty much what i would expect to see given the set up that you described. The saturation seen in the pixels up to ~810 isn't surprising, the next thing you probably want to do would be to establish more precise control over the integration t...
by blmorris
Mon Nov 09, 2015 3:22 pm
Forum: WiPy and CC3200 boards
Topic: Controlling a led, pull up resistor value
Replies: 12
Views: 5009

Re: Controlling a led, pull up resistor value

@bmarkus @danicampora: While it may work, as a general rule NEVER drive a LED directly from a microcontroller port. My first thought on reading this was "wait a minute, why not? I've put something like 10K boards of various designs into production doing exactly that!" Then I read the part about usin...
by blmorris
Fri Nov 06, 2015 4:56 pm
Forum: General Discussion and Questions
Topic: PyBoard and Wipy stalls during gc.collect()
Replies: 19
Views: 5653

Re: PyBoard and Wipy stalls during gc.collect()

I second that thank you! A few new tricks to add to the tool belt!
-Bryan
by blmorris
Thu Nov 05, 2015 4:00 pm
Forum: MicroPython pyboard
Topic: RTC Calibration question
Replies: 2
Views: 1067

Re: RTC Calibration question

I think you have the right answer. Without power or VBAT you only retain what you have stored in flash (or the SD card). Everything else - RTC time, backup RAM and backup registers - is lost. The RTC calibration register is just another RAM address, albeit one that implements a specific write protec...
by blmorris
Wed Nov 04, 2015 7:26 pm
Forum: General Discussion and Questions
Topic: Wireless communication and libaries
Replies: 2
Views: 1837

Re: Wireless communication and libaries

The nRF24L01+ has a supported driver written in pure Python , which can be used to establish a point-to-point serial link. Not sure if it supports point to multipoint, though. You won't be able to run numpy or scipy directly on the pyboard, these are relatively large libraries that require more memo...
by blmorris
Wed Nov 04, 2015 6:45 pm
Forum: Hardware Projects
Topic: PyGuitar
Replies: 2
Views: 2396

Re: PyGuitar

Hey Bob- Very cool project, thanks for sharing with us!
And now I understand the context of your other questions here; it's great to see it all come together like that. Sounds great too!

Cheers,
Bryan
by blmorris
Wed Nov 04, 2015 4:54 pm
Forum: MicroPython pyboard
Topic: USB and Vin connected simultaneously
Replies: 5
Views: 2701

Re: USB and Vin connected simultaneously

@gratefulfrog - Good to hear it! I suspect that the problem has more to do with the LM2956 latching up because its feedback pin is energized before it gets turned on, and less to do with reverse current from the USB being injected to the ML2956 because of the voltage difference, but either way it's ...
by blmorris
Tue Nov 03, 2015 8:44 pm
Forum: MicroPython pyboard
Topic: USB power and Vin power at the same time?
Replies: 4
Views: 2291

Re: USB power and Vin power at the same time?

It sounds like the LM2596 doesn't like having its feedback and output pins energized before it gets powered up; I don't have a good theory why, so this is just my WAG, but it is possible that it is latching up somehow. Either way, having another diode between the PSU output and Vin should prevent th...