Go to advanced search

by Joel_Mckay
Sat Feb 02, 2019 6:56 am
Forum: Automation, sensing and robotics
Topic: how to make this ?
Replies: 12
Views: 768

Re: how to make this ?

Does that controller do spindle speed control? We ported in open Arduino firmware people would be comfortable modding, and the version of GRBL on the distro has been setup to run the 12v 10A PWM (low 1kHz drive for laser triggers) on the spindle out. We mostly use this to run fast little diode-lase...
by Joel_Mckay
Sat Feb 02, 2019 4:53 am
Forum: Automation, sensing and robotics
Topic: how to make this ?
Replies: 12
Views: 768

Re: how to make this ?

Ok FreeCad on aarch64 Raspbian Debian has a mesa loader issue as expected, Now trying 32bit Raspbian, yep works in 32bit Raspbian. Will also try Gentoo64, that has Mesa 18.3.0, not old Raspbian 13.x Need all these just to make those injector molds ;) We built FreeCad 18.x from the stable head as th...
by Joel_Mckay
Fri Feb 01, 2019 11:55 pm
Forum: Automation, sensing and robotics
Topic: how to make this ?
Replies: 12
Views: 768

Re: how to make this ?

Love to get a Tormach and Datron Mill for the small stuff. Looks nice, but do you have a photo of the drive gearbox? We got stung by those nylon gearbox designs before, and now have a belt-drive only rule for spindles. (Mostly a human error problem, but chipping a tooth seemed inevitable on the uni...
by Joel_Mckay
Fri Feb 01, 2019 10:12 am
Forum: Automation, sensing and robotics
Topic: how to make this ?
Replies: 12
Views: 768

Re: how to make this ?

I want one, plus the cnc mill that made those dies, need G-code for that. I rebuilt my mini home machine for LinuxCNC, and regularly post the entire CAD/CAM software tool-chains along with hard-to-find utilities we found useful. FreeCAD "Path" toolbox and HeeksCNC are slow on the pi3B+, but run jus...
by Joel_Mckay
Fri Feb 01, 2019 7:36 am
Forum: Automation, sensing and robotics
Topic: how to make this ?
Replies: 12
Views: 768

Re: how to make this ?

Please ensure to enclose this type of machinery with a blast-shield, as pressurized molten plastic can be dangerous. Stream pressure from residual water in the plastic can cause all sorts of really nasty accidents. However, I suspect this user is probably just using a Marlin (atmega2560) based contr...
by Joel_Mckay
Fri Feb 01, 2019 6:50 am
Forum: Automation, sensing and robotics
Topic: Which expansion boards should I buy for automation?
Replies: 3
Views: 319

Re: Which expansion boards should I buy for automation?

A lawsuit from an insurance company,,, and or fine from the inspectors.... can cost your company much more than a real PLC.

I have built custom industrial stuff before, and it only really makes economic sense if building over 10k pcs at a time.
;-)

Best of luck,
J
by Joel_Mckay
Wed Jan 30, 2019 8:14 am
Forum: Troubleshooting
Topic: Radar Project Using Ultra Sonic Sensor
Replies: 20
Views: 1297

Re: Radar Project Using Ultra Sonic Sensor

Sonars make great wind-speed indicators, and unreliable distance sensors. ;-) Low cost Radars are a real option now, and worth looking at given the example code is for a PI if I recall: https://www.acconeer.com/products https://www.digikey.com/product-detail/en/acconeer-ab/A111/1891-1000-ND/8040771 ...
by Joel_Mckay
Tue Jan 29, 2019 2:19 am
Forum: Advanced users
Topic: Handling UART interrupt on Raspbian OS
Replies: 7
Views: 674

Re: Handling UART interrupt on Raspbian OS

I actually have implemented serial communication using termios.h . Fortunately, it seemed to work well with 1Mbps baud rate although manual said me not to do that. With most FTDI USB-to-serial adapters they have much larger fifo buffers than classic hardware uarts, and easily achieve 3MBaud with th...
by Joel_Mckay
Mon Jan 28, 2019 11:29 am
Forum: Advanced users
Topic: Handling UART interrupt on Raspbian OS
Replies: 7
Views: 674

Re: Handling UART interrupt on Raspbian OS

There are a number of ways to handle the UART buffers in Linux, and it is somewhat limited by which driver you are using. Normally, a threaded C program will simply use a blocking Canonical mode with buffer reads terminated by '\n', and consumes negligible cpu time while waiting for a key character ...
by Joel_Mckay
Sun Jan 27, 2019 9:04 am
Forum: Troubleshooting
Topic: Pi v2 Camera Corrupts SD card
Replies: 5
Views: 233

Re: Pi v2 Camera Corrupts SD card

No, the camera cannot interfere with the HAT I2C. My mistake, as it has been a few years.... this was probably what I was thinking about. I'm not sure there is a fix. At least not with sane timescales. The problem as I remember it is that the GPU need access to the I2C to talk to the camera. If you...
by Joel_Mckay
Sun Jan 27, 2019 3:18 am
Forum: Troubleshooting
Topic: updating jessie to stretch
Replies: 3
Views: 569

Re: updating jessie to stretch

I tried this and it didn't end cleanly, as there seemed to be several hard to replicate bugs after it completed. It would be wise to simply use a fresh/clean foundation raspbian install, and simply import your deb package list selections. One could also try out a pre-setup distro we maintain for our...
by Joel_Mckay
Sun Jan 27, 2019 3:09 am
Forum: Troubleshooting
Topic: Pi v2 Camera Corrupts SD card
Replies: 5
Views: 233

Re: Pi v2 Camera Corrupts SD card

First try it with CVLC to see if it is still hanging the system. As a precaution, disable the HAT eeprom i2c bus, as the Camera module can interfere with i2c bus access. In theory, an open-collector bus drive contention can't cause a "short", but can corrupt the protocol in bizarre ways. Other than ...
by Joel_Mckay
Tue Jan 22, 2019 12:06 am
Forum: Troubleshooting
Topic: Think I've got an sd card problem, but want to rule out anything worse.
Replies: 8
Views: 513

Re: Think I've got an sd card problem, but want to rule out anything worse.

SLC flash is still manufactured, and is good for over 100k writes. MLC ("Sandisk ultra", and most others) flash about 10k writes. TLC are only good for under 5k writes, but in my experience can be under 1.4k writes. Most USB flash-drives are of the lowest quality type. Also, not all USB-to-SATA adap...
by Joel_Mckay
Wed Jan 16, 2019 5:49 am
Forum: Advanced users
Topic: interfacing with matlab & simulink - is it free
Replies: 4
Views: 704

Re: interfacing with matlab & simulink - is it free

The open Octave is fairly similar to Matlab, and Julia is the super-computing option.
https://julialang.org/learning/

There are no shortcuts in learning how to write software, but python is a good place to start.
by Joel_Mckay
Fri Jan 11, 2019 7:30 pm
Forum: Advanced users
Topic: accessing device connected in eth0
Replies: 2
Views: 476

Re: accessing device connected in eth0

In general, a good VPN will create a local virtual network device, and sand-boxed networks. After a client connects to the tunnel, a local IP is assigned for each remote user in the sand-boxed network. The admin must then decide how to route packets between the sand-boxed area, and other actual LAN ...
by Joel_Mckay
Tue Jan 08, 2019 3:47 am
Forum: Advanced users
Topic: syslog - is someone rerouting data to another site?
Replies: 2
Views: 553

Re: syslog - is someone rerouting data to another site?

Access attempts are usually logged to: sudo tail -n 100 /var/log/auth.log The Xwindows GUI layer does open local connections to system resources you need to use, and can be reviewed with: sudo netstat | grep 'X11' If you want to monitor network activity, than wireshark is the standard tool. However,...
by Joel_Mckay
Mon Jan 07, 2019 7:23 pm
Forum: Troubleshooting
Topic: Stuck! Cannot SSH or Ping with new Pi3 on Stretch
Replies: 10
Views: 499

Re: Stuck! Cannot SSH or Ping with new Pi3 on Stretch

Some wifi routers disable cross forwarding between network areas. Our local club desktop image also enables ufw basic firewall by default, as we saw some users getting tagged by annoying traffic on the ssh port (i.e. few inexperienced users would know/bother to change the default password on standar...
by Joel_Mckay
Fri Jan 04, 2019 5:40 pm
Forum: Graphics, sound and multimedia
Topic: Is Openscad ported to Raspbian Stretch?
Replies: 20
Views: 5484

Re: Is Openscad ported to Raspbian Stretch?

@scruss I was hoping our clubs forced qt4 built version was finally getting an update to qt5 with better gpu acceleration. ;-) It would have been nice to finally get that graphics driver lib issue in qt5 finally solved, as it broke several other packages. We just released the rc1 version of our desk...
by Joel_Mckay
Fri Jan 04, 2019 5:21 pm
Forum: Advanced users
Topic: Changes do not survive power cycle
Replies: 7
Views: 528

Re: Changes do not survive power cycle

For our club machinery, we use an ramdrive and overlayfs: https://sourceforge.net/projects/micrometer-cnc-on-raspberry-pi/files/ And map the /home to a writable partition for everything that needs to persist. Professionally, the logger equipment I would design used SLC flash, large journals (150MB o...
by Joel_Mckay
Thu Jan 03, 2019 8:10 pm
Forum: Troubleshooting
Topic: No HDMI Output Although TV is recognized by RPi 3 B+
Replies: 21
Views: 2776

Re: No HDMI Output Although TV is recognized by RPi 3 B+

Maybe add a HDMI Switch between the TV and your pi, as a $7 part is a less painful loss. The pi3/pi3b+ ATX PC infinity motherboard offer is still valid if you are interested in covering the shipping from Canada. You can contact me though the online form if you like: https://www.micrometer.xyz/cdn/no...
by Joel_Mckay
Wed Jan 02, 2019 11:44 pm
Forum: Troubleshooting
Topic: Overheating without reason
Replies: 7
Views: 362

Re: Overheating without reason

I don't think this is true for any RPis other than early versions of the original Model B back in 2012. Those had a design error where the 1.8 volt pin on the LAN+USB chip was thought to be a power input and was connected to the board's 1.8 volt regulator. In fact that pin was an output from the ch...
by Joel_Mckay
Wed Jan 02, 2019 10:48 pm
Forum: Troubleshooting
Topic: Overheating without reason
Replies: 7
Views: 362

Re: Overheating why ?

1. The 3v3 rail pin on the pi is for powering an external hat eeprom, and was never intended to supply more than 50mA. https://elinux.org/Rpi_Low-level_peripherals#P1_Header_pinout.2C_bottom_row https://www.raspberrypi.org/forums/viewtopic.php?p=634795 2. Although switching to the 5v rail is less pr...
by Joel_Mckay
Wed Jan 02, 2019 9:24 pm
Forum: Troubleshooting
Topic: VLC 3.0.3 is crashing my RPi3
Replies: 20
Views: 1193

Re: VLC 3.0.3 is crashing my RPi3

Code: Select all

dmesg
sudo tail -n 1000 /var/log/kern.log
May be related if using out-of-date older kernel or firmware.
viewtopic.php?f=29&t=220986

Best of luck,
J
by Joel_Mckay
Wed Jan 02, 2019 9:10 pm
Forum: Troubleshooting
Topic: Overheating without reason
Replies: 7
Views: 362

Re: Overheating without reason

It sounds like you have several things happening at once, and thus it may be difficult to identify the root cause. However, I have found the following is common: 1. some pi3 board revisions caused the Ethernet chip to get rather hot, and a fan cooled heat-sink was recommended. Later PCB revisions di...
by Joel_Mckay
Wed Jan 02, 2019 7:06 pm
Forum: Troubleshooting
Topic: Strange issue with main menu language
Replies: 9
Views: 264

Re: Strange issue with main menu language

Try reset of local menu config:
mv ~/.config/lxpanel ~/lxpanel_bak
sudo shutdown -r now


Usually screenshot capture is possible by pressing print screen button

Go to advanced search