Search found 348 matches

by blmorris
Tue Oct 27, 2015 2:03 am
Forum: General Discussion and Questions
Topic: MicroPython and linear ccd sensor
Replies: 4
Views: 2649

Re: MicroPython and linear ccd sensor

Vitali- You're welcome, glad I could help. And I didn't mean to knock the AMS parts for being less sophisticated- they are quite capable, just perhaps not as sensitive over as broad a spectrum as the Hamamatsu part. You have me thinking of digging up a few of the AMS / TAOS sensors and trying to mak...
by blmorris
Mon Oct 26, 2015 1:56 pm
Forum: WiPy and CC3200 boards
Topic: Wipy outdoors
Replies: 6
Views: 3858

Re: Wipy outdoors

I suspect that a Nordic winter can potentially get colder than -40C, but that would depend just how far north you are. I can't find any good references quickly, so take what follows with a grain of salt ;) There are a few issues with temperature. First, the different coefficients of expansion of the...
by blmorris
Mon Oct 26, 2015 1:17 pm
Forum: General Discussion and Questions
Topic: MicroPython and linear ccd sensor
Replies: 4
Views: 2649

Re: MicroPython and linear ccd sensor

While I haven't ever used that kind of CCD sensor, a quick read through the links you provided suggests that the power supply and interface requirements are relatively complicated - the Toshiba part requires a 12V supply for the sensor portion and 5V TTL logic for the interface. The Hamamatsu part s...
by blmorris
Thu Oct 22, 2015 2:16 pm
Forum: WiPy and CC3200 boards
Topic: Unreliable Operation: FTP, Telnet, Power, ...
Replies: 27
Views: 11041

Re: Unreliable Operation: FTP, Telnet, Power, ...

@mhepp - More information on your power supply would be helpful if you can provide it. Specifically part numbers and / or a link to a full spec for the step-up converter and the 1.5V cell that you are using. (Is the cell a standard AA or AAA alkaline, or is it something else?) What kind of solder ar...
by blmorris
Tue Oct 20, 2015 6:46 pm
Forum: MicroPython pyboard
Topic: RTC Clock calibration question
Replies: 11
Views: 4822

Re: RTC Clock calibration question

JimTal001 - That is good news, in a way; at least the RTC hardware on your board isn't broken or defective. I come to the same conclusion as you, software bug in the interaction between pyb.standby() and pyb.rtc() The thing to do now is to open an issue on GitHub with a simple code example to replic...
by blmorris
Tue Oct 20, 2015 3:10 pm
Forum: MicroPython pyboard
Topic: RTC Clock calibration question
Replies: 11
Views: 4822

Re: RTC Clock calibration question

I assume that you have your REPL on one of the UARTs rather than on USB? The 'standby()' command will kill any USB connection, of course. Asking because I would like to replicate your setup to see what I get. I know that the RTC on my board runs closer to real time, and going into standby mode shoul...
by blmorris
Tue Oct 20, 2015 2:04 pm
Forum: Announcements and News
Topic: MicroPython on the BBC micro:bit
Replies: 26
Views: 22570

Re: MicroPython on the BBC micro:bit

Hi Where would you like discussions relating to the micro:bit to be posted? Given the scale of the project, seems it would make sense to start a new top-level list for the micro:bit in the "Boards running MicroPython" sub-forum. This is so cool. Speaking as a hardware developer, the micro:bit looks...
by blmorris
Mon Oct 19, 2015 9:46 pm
Forum: MicroPython pyboard
Topic: RTC Clock calibration question
Replies: 11
Views: 4822

Re: RTC Clock calibration question

That is much too far off for a properly functioning RTC crystal; if correct, it seems like something is broken. There have been some other reports of RTC measurements on different pyboards, all of the measured offsets were reported to be less than 200ppm, or a few seconds per day (which is still a l...
by blmorris
Sat Oct 10, 2015 1:37 pm
Forum: General Discussion and Questions
Topic: pin switching times?
Replies: 32
Views: 11530

Re: pin switching times?

If you haven't done so already, you could take a look at the driver for the one-wire protocol, which is written in Python and performs timing-critical bit banging like you are attempting: https://github.com/micropython/micropython/blob/master/drivers/onewire/onewire.py I admit that I haven't investi...
by blmorris
Fri Oct 09, 2015 7:34 pm
Forum: MicroPython pyboard
Topic: RTC Bug?
Replies: 17
Views: 7071

Re: RTC Bug?

For a crude first-order correction, you can measure how far off it is over the course of a day or two and convert that to parts-per-million. You can use that number with the RTC calibration method: http://docs.micropython.org/en/latest/library/pyb.RTC.html If you have access to a high-precision time...