00:07 <mattb00ne> OK more testing

00:09 <mattb00ne> if I make a full circuit with LED and resistor in series and have line go to V_l

00:09 <mattb00ne> it works

00:10 <mattb00ne> so I need to figure out how to wire up to the CL86T

01:52 <mattb00ne> woot

01:52 <mattb00ne> got it

01:53 <mattb00ne> thought I dont understand why it works

01:53 <mattb00ne> I will need a zmatt lesson later

01:53 <mattb00ne> bbl

08:52 <zmatt> mattb00ne: 1. don't attach the (terribly named) V_L to ground, that just shorts all outputs to ground

08:52 <zmatt> 1. the VCC input is unused, except that the JP1 jumper can connect it to V_L

08:54 <zmatt> ehh that was 2.

08:55 <zmatt> 3. your wiring diagram is incomplete, your stepper driver has no CW or CCW inputs, it has CW+, CW-, CCW+, CCW-

08:59 <zmatt> hmmmmm I also only just noticed that this thing has rather small series resistors on its base (470 Ω)... I mean, I think the AM335x should be okay but I'd definitely have preferred those to be at least 1 kΩ

09:00 <zmatt> (having to worry about that is the downside of using transistors versus an IC with CMOS inputs)

09:04 <zmatt> mattb00ne: just compare the schematic I gave you ( https://photos.app.goo.gl/Guf636qHLxzmdBvK9 ) with what this module provides ( https://digilent.com/reference/_media/reference/pmod/pmodoc1/pmodoc1_sch.pdf ) and it should be pretty straightforward how to wire it up

09:04 <zmatt> you can ignore the diodes in the module's schematic, provided you don't short V_L to ground... just leave it unconnected

09:05 <zmatt> you can *probably* ignore the difference in resistor values

09:05 <zmatt> (10 kΩ might actually be slightly too large in this application, optimal would probably be between 1 kΩ and 4.7 kΩ or so)

09:06 <zmatt> (but 470 Ω is okay... probably)

09:07 <zmatt> especially since you're just sending short pulses

09:11 <zmatt> if hooked up correctly the module acts like an inverter: the expected voltage on CW- or CCW- is 5V when the corresponding gpio is low and somewhere between 0V and 0.3V when the gpio is high

09:12 <zmatt> (it will be 5V not because the module outputs 5V but as a result of the 5V supply to CW+/CCW+ )

12:38 <outrageous> mattb00ne: Was just scrolling through something zmatt wrote to the channel this morning in response to your questions last night..did you receive it yet?

14:24 <zmatt> mattb00ne: indeed, check irc log

14:25 <zmatt> outrageous: I think he usually checks, but thanks for pinging him just in case!

18:19 <MThomas> I purchased a BeagleBone black to take an Udemy course on Embedded Linux.  My serial port on the BeagleBone doesn't work exactly as expected.  Some readable text comes through, but most of it is garbled.  Where can I go to get support on troubleshooting this problem?

18:28 <mattb00ne> what is the size of boolean variable in C

18:28 <mattb00ne> 8 bit?

18:34 <mattb00ne> @zmatt: thanks for the info

18:35 <mattb00ne> @outrageous: good looking out

18:35 <mattb00ne> MThomas

18:35 <mattb00ne> did you set the baudrate

18:35 <mattb00ne> if you do not change it to 115200 you will get garbage over the serial line

18:36 <mattb00ne> I need to digest these zmatt comments, electronics makes my head hurt

18:36 <mattb00ne> lol

18:36 <mattb00ne> I jsut dont have a natural feel for it

20:14 <zmatt> mattb00ne: if "some readable text comes through" then baudrate isn't the problem, since wrong baudrate would result in absolutely nothing readable getting through

20:14 <zmatt> probably they were using a 5V usb-serial cable that doesn't work reliably with 3.3V signals from the beaglebone. (fortunately the serial console port is 5V-tolerant, about the only thing on the beaglebone that is)

20:17 <zmatt> and I don't think there's a "natural" feel for electronics, you just learn how it works :P it can be useful to use analogies in various kinds of mechanical or hydraulic/pneumatic systems