CircuitPython - a Python implementation for teaching coding with microcontrollers https://git.suspectdevices.com/suspect-devices/circuitpython/atom?h=2.2.0rc1 2017-12-13T18:12:49+00:00 2017-12-13T18:12:49+00:00 Dan Halbert halbert@halwitz.org 2017-12-13T18:12:49+00:00 urn:sha1:43650b689674a18b95d520921d10a91b67f64c84 Changes: * New faster filter loop, by @ladyada. New filter coefficients as well. * Turn on microphone clock when PDMIn object is created, and run it all the time, so the user code doesn't have to wait for microphone startup, which can be 10ms or even 100ms. * Wait for microphone startup when PDMIn is first created, based on new optional parameter microphone_startup in seconds (takes a float). * record() returns number of samples actually recorded, so you can see if it's not keeping up. * Fix buffer overflow errors when buffer size was not a multiple of 16 or something like that. * Tweak a few peripheral settings. * Minimum sampling frequency is now 16kHZ or so, because 8kHz runs microphone at only 0.5MHz, which is too slow for many mics. Note: I tried 128x oversampling instead of 64x, but the code cannot keep up at 24kHz or above sampling. 128x would reduce the high-frequency noise by 6db. 2017-10-03T19:07:17+00:00 Dan Halbert halbert@halwitz.org 2017-10-03T00:49:40+00:00 urn:sha1:c478c10923b9085b2abe135470e968029aaf2fdb Fixes #278, #277, #276, #275. 2017-09-05T23:37:02+00:00 Scott Shawcroft scott@chickadee.tech 2017-09-05T19:31:02+00:00 urn:sha1:6d9d683443705a3c06afbf3cc4e64da86e5c9dc6 quiet. Also update the examples. Fixes #226 2017-08-26T02:17:07+00:00 Dan Halbert halbert@halwitz.org 2017-08-26T02:17:07+00:00 urn:sha1:ef61b5ecb59e9b4e37e3e3c023c62d583c23eb16 cpx build compiles and loads and works in repl; test suite not run yet esp8266 not tested yet 2017-07-28T19:12:38+00:00 Scott Shawcroft scott.shawcroft@gmail.com 2017-05-24T17:43:32+00:00 urn:sha1:557ceded00de20d2070e1397d3dec322f753d1e6 microphones.