MicroPython Forum (Archive)

ds18b20 works here with the new onewire.py and latest firmware. Just using regular gnd and 3v3 vdd instead of GP1 and GP3, that did not work for me. 4k7 pullup. Reading in ice water got as low as 200, not a precision device. Looking forward to the LoRa device - why I'm brushing up on MicroPython :ge...

Collected about 4MB of os.urandom(1024) concatenated and ran this test (where ocassional low or high p values will occasionally occur in a good trng, that is, in another collection that one weak will go away and maybe another will appear elsewhere, it happens): chuck@pe1950b:~$ dieharder -a -f bigra...

yes, hours of frustrated experimenting can save you minutes of reading

My (admittedly sub-optimal) main.py wifi init script stopped working after update to 1.1.0. Took a while but traced it down to this: wifi = WLAN(WLAN.STA) wifi would still be in WLAN.AP mode and subsequent attempts to connect would error. This is working now: wifi = WLAN() wifi.mode(WLAN.STA) wifi.i...

Ok, we'll wait. Getting past the op error (by using freq=5) I've run into this before: >>> tim_ch.callback(handler=lambda t:led.toggle()) Traceback (most recent call last): File "<stdin>", line 1, in <module> AttributeError: no such attribute >>> dir(tim_ch) ['freq', 'period', 'time', 'event_count',...

That makes sense - I juggled some things around and got what looks like it *should* work from what little I understand: http://swigerco.com/TempSensor_fixed-still-fails.jpg Just for comparison, here's an arduino rom scan, a lot tighter: http://swigerco.com/Arduino_ROM_SCAN.JPG The difference on the ...

I think you need to use a higher frequency than 2 - try 5 or more. The clock speed and max count are such that 5hz is about the lowest it can divide down to.

Mine's offline or I'd test it

Ha - thought I'd tried that somewhat obvious variation but guess not - that works! thanks. >>> p24 = Pin('GP24',Pin.ALT,alt=5) I'll readup on Timers to adapt it to GP24 as I don't see 25 on the pinout. This stab didn't work: >>> p24.alt_list() [('UART1_RX', 2), ('TIM3_CC0', 4), (' TIM0_PWM0 ', 5), (...

Looking at the PWM example http://micropython.org/resources/docs/en/latest/wipy/wipy/quickref.html#pwm-pulse-width-modulation some things have changed - Pin.ALT instead of Pin.AF and I can do these: >>> p24 = Pin('GP24',Pin.ALT) >>> p24.alt_list() [('UART1_RX', 2), ('TIM3_CC0', 4), ('TIM0_PWM0', 5),...

Diving in with Lucien2K code - I'm seeing the presence pulse and reset returns true: >>> from tempsensor import TempSensor >>> from machine import Pin >>> p = Pin('GP1') >>> t = TempSensor(p) http://swigerco.com/ds18b20_init.JPG def reset(self): """ Perform the onewire reset function. Returns 1 if a...