Raspberry Pi Forums

TimmR

Hi all, My pi's wifi keeps crashing within a few minutes after booting. This is the error it gives me: rtw_cmd_thread: Driver Stopped(0) Surprise Removed(1) break at line 482 Connected to the pi: - powerd usb hub (DIY powered, 1A) -- wifi dongle -- bluetooth dongle -- webcam Anyone knows how to solv...

TimmR

First of all. I'm a real noob with this subject. But from what I understand is that your RPI looses connection every now and then? If so, you might also want to add replacing the SD card to your debugging. My connections where crashing and returning "disabling irq #32". I've swapped my random bought...

TimmR

Hi all, I recently blew up my PSU (and some other components) so I had to replace it. The PSU was used as a bench-top power supply. I've started a little side project to make a tool to attach any PSU to make it a benchtop power supply with banana connectors. But now for the main question . Does a PS...

TimmR

I see, no so far no crashes with the pi.
I've stripped some of the usb cable and
cut the power cables of it. Then I connected
it to the loose power cables that went to
the hub to a 5V rail.

Thanks, your link looks interesting. I'll take
a look at it!

TimmR

Sweet! As a quick fix I will go with jbd's solution
But Lob0426's solution will, I guess, be implemented later on.

Thanks guys! Great solutions!
Just one more quick question.
I power the usb hub trough a modded usb cable
directly from a psu. Do you think the 5V is stable enough?

TimmR

Hi all,

Is there a way to get usb data trough the GPIO?
Or maybe trough another solder point?
(cut the usb cable in half and only use the data cables)

I have powerd usb hub in my project. But the
project case is too small for an normal usb plug...

TimmR

Sweet! all seems to work fine.
Placed the gear in place and after finding out the min and max speed for
the rotary table all works good!

Thank you very much for your time and help!

TimmR

Sweet! the speed seems to work just fine! Except one thing. The motor keeps running after the script finishes. Tomorrow I will try the script with a gear attached to the motor. One more (extra) thing I guess, now with PWM, I cant use a stepCounter anymore right? With simple on/off I could add "stepC...

TimmR

That is expected behaviour. The dutycycle makes no differences to the number of pulses, it just varies the ratio of the on pulse time to the off pulse time. You need to change the frequency of the PWM itself. Ah, I see. I've got that working now with: pigpio.set_PWM_frequency(22, 1000) But, indeed,...

TimmR

joan wrote: ...
If you are not using I2S sound the simplest solution is to blacklist the module,

Ah, that did the trick.

But with your code still the same result.
"pigpio.set_PWM_dutycycle(22, 2)" and up to 255 are all the same speed with the easydriver.

TimmR

Cheers, I will try this out. Running the script gives me: Traceback (most recent call last): File "./test07.py", line 7, in <module> pigpio.start('127.0.0.1',8888) File "/usr/local/lib/python2.7/dist-packages/pigpio.py", line 1996, in start _control.connect((_host, _port)) File "/usr/lib/python2.7/s...

TimmR

Hmm, I see.

It goes down to 0.00001

TimmR

Ah right, sorry. I have an easydriver with a stepper motor connected to GPIO 22. The motor moves one step with this script: GPIO.output(pinStep0Step, GPIO.HIGH) time.sleep(stepperSpeed) GPIO.output(pinStep0Step, GPIO.LOW) time.sleep(stepperSpeed) But since time.sleep() slows my script. As stated abo...

TimmR

I see what you mean. If I could implement PWM I could completely delete all time.sleep() functions in my script. But I can't seem to get it to work with my easydriver This is the test script: import time from RPIO import PWM def initchannel(): PWM.setup() PWM.init_channel(0) def main(): initchannel(...

TimmR

Hey all, A couple days ago someone told me to use a "ticks" counter instead of a time.sleep() in my coding. This is an example where I use time.sleep() : GPIO.output(pinStep0Step, GPIO.HIGH) time.sleep(stepperSpeed) GPIO.output(pinStep0Step, GPIO.LOW) time.sleep(stepperSpeed) I use time.sleep() seve...

TimmR

You can support the Pi thru this period by putting a diode in its supply, check what voltage drop you get, and adding a small reservoir of energy by adding a small capacitor. The capacitor runs the Pi for 1 second, and the diode prevents the power going back towards the PSU. I'm trying to wrap my h...

TimmR

I see, I will definitely try that one out than. I have some power problem to overcome first ^^
Cheers for the help!

I'm wondering if I can do multi task several function (noob-talk here) at the same time.

TimmR

Thanks Dave,
About 30 minutes ago I've successfully applied this
code. Or at least I think it's the same. http://pythonhosted.org/RPIO/pwm_py.html

It helps a lot. but still it slows down half the speed if is activate the X and Y axis at the same time.

TimmR

Thanks! It sure is a step forward! Now I can use the shield properly.
I've just happen to have two of each in my starterskid

But... the system still reboots after I switch the relay and so turn on the motor...
My uneducated guess would be a spike? Can I protect the circuit to such spikes?

TimmR

I see that the RPI stays on when I power the
motor directly, before the RPI boots and keep
the motor running.

Now, I don't have any electrical knowledge.
But could there be some spike of something
on the moment the RPI runs AND I turn on the
relay, which turns on the motor?

TimmR

Yeah! my first circuit diagram!
The relay is actually a relay shield (YwRobot)
The shield works fine.

And the power comes from one pc power.

: Untitled.jpg (40.43 KiB) Viewed 2819 times

The thing is that I really just want one power source.
The RPI is controlling a nerf Vulcan toy gun.

TimmR

Hi all, I have an old PC power adapter from which I get 12v and 5v. The 5v powers the RPI and the 12v powers a motor. The motor is turned on and off by a relay. And the grounds are connected. But when I turn on the relay (and the motor) the RPI reboots. The motor does work directly without relay whe...

TimmR

Hey all! This is my first Python script and I don't have a lot of programming experience for that matter. I'm working on a little script to control al small "robot" with my PS3 controller. Right now I'm working on a pan/tilt system with a steppermotor on the X-axis and two servos on the Y-axis. The ...

TimmR

Great, good tips!

but is there a way so that I can measure if the EasyDriver
will short a new RPI?

TimmR

Hey all, lesson learned, do not work until late in the night. All worked fine but then I've excellently put an 12v power jumper into ground.. . - I've had the RPI on a 5v rail but the ground was connected. - Also connected was the EasyDriver 4.4 with a stepper motor (12V). - shorted with 12v to grou...

Search found 34 matches

?? rtw_cmd_thread: DriverStopped(0) SurpriseRemoved(1) ??

Re: Connections lock up

Does a PSU has groups?

Re: USB data through GPIO?

Re: USB data through GPIO?

USB data through GPIO?

Re: ticks instead of time.sleep() ?

Re: ticks instead of time.sleep() ?

Re: ticks instead of time.sleep() ?

Re: ticks instead of time.sleep() ?

Re: ticks instead of time.sleep() ?

Re: ticks instead of time.sleep() ?

Re: ticks instead of time.sleep() ?

Re: ticks instead of time.sleep() ?

ticks instead of time.sleep() ?

Re: RPI reboots when powering motor with relay

Re: Python GPIO control slow script...

Re: Python GPIO control slow script...

Re: RPI reboots when powering motor with relay

Re: RPI reboots when powering motor with relay

Re: RPI reboots when powering motor with relay

RPI reboots when powering motor with relay

Python GPIO control slow script...

Re: shorted RPI, pray to the polyfuse gods?

shorted RPI, pray to the polyfuse gods?