MicroPython Forum (Archive)

Hi, Here are the results of testing your suggestions : 1- If you are able to get good 'popless' shunting at 1% PWM, that tells me that you don't need to drive your Vactrol LED at anything close to the 40-50mA that you will get at 100% duty cycle. You can probably dispense with the BJT and drive the ...

Thanks again for those new tips. I am away from the workbench for a few days, but will report back as soon as I have implemented the changes. I had tried separating the GNDs from the audio and the active electronics in the past and that cause tons of noise to get into the amp. So I put all the groun...

Following your ideas, and reading some books (yes, Google is not the only place to find information ;-) ), I built this circuit (schematic attached) which seems to work! My goal is to eliminate the pops when the audio source changes by first shunting the amp input, making the change, then un-shuntin...

Thank you both for your replies. First, I guess I should have explained exactly what I am doing. I am using a vactrol (LED-LDR) as an opto-isolated variable resistance. I want to control it with the pyboad. The vactrol LED has a current range of 0 to 40mA. That is what I want to control with a resol...

Hello, I have an application which requires that I gradually increase/decrease the current through a LED (5v) The current has to vary from 0 to 40mA. Excuse my lack of knowledge, but I have the feeling that the pyboard's DAC with 256 step resolution should be able to somehow control the current via ...

Hi, Thanks for the pointer! I updated the firmware but wasn't sure if the network drivers were right for my board or not? Anyway, I updated to the version with the network drivers and then the eval issue was cleared. Thanks for the help, and again sorry to be so ignorant! As I said earlier, this boa...

Hi! Thanks for the reply. When I do a soft boot on my board: Micro Python v1.2-15-g951ed9d on 2014-07-20; PYBv1.0 with STM32F405RG The following code works on the live on-line board : class C: def __init__(self): self.x=1 def show(self, arg): print(eval('self.' + arg, globals(),{'self':self})) c = C...

Hi, I'm perplexed by the pyboard's implementation of eval(). On a linux pc, running python 3.4.0: >>> eval("1+1",globals(),locals()) 2 But on the pyboard: >>> eval("1+1",globals(),locals()) Traceback (most recent call last): File "<stdin>", line 0, in <module> TypeError: function takes 1 positional ...

Hi! I'm new to the pyboard and this froum, but I justed wanted to share my first pyboard experiences with you all. My application, the ArduGuitar , requires SPI and shift registers, so I started with a 74HC595 and the pyboard and WOW was it easy to get that going! Here's a little video demo . My goa...