MicroPython Forum (Archive)

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...

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...

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...

@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...

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...

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...

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...

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...

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...

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...