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by harmsobuk
Sun Jun 21, 2015 12:49 pm
Forum: Automation, sensing and robotics
Topic: Nema17 current and power supply
Replies: 1
Views: 497

Nema17 current and power supply

Hi there, I have been designing a cnc dremel for the past few weeks now, and after I finish my final exams I am going to spend more time on it. I bought 3 nema 17 steppers for this project, and together with a friend we (mostly he) designed a way to power the stepper without using a driver (for more...
by harmsobuk
Tue Jun 16, 2015 8:15 am
Forum: Automation, sensing and robotics
Topic: Pi robot
Replies: 2
Views: 621

Re: Pi robot

i learned python from a book, which you can read online if you don't want to buy it. i skipped the last few lessons, which were about taking input from a webpage. http://learnpythonthehardway.org/book/ Lesson 51 and 52 are about taking input from a webpage. hope this helps, probably not if you are n...
by harmsobuk
Tue May 26, 2015 8:30 pm
Forum: Automation, sensing and robotics
Topic: Nema17 driver
Replies: 0
Views: 1173

Nema17 driver

Hi there, I have been working on a low budget (my goal is to stay under €150, and it's going well so far) cnc machine for a few weeks now. My finals are pretty much over, the last one will be tomorrow, so I can finally start spending some real time on it. I have been working on the design, and makin...
by harmsobuk
Mon Apr 06, 2015 6:18 pm
Forum: Automation, sensing and robotics
Topic: CNC Dremel
Replies: 6
Views: 2416

CNC Dremel

Hi there, You might remember me from the recent laser cutter post. after gathering some information about the laser i needed, i came to the conclusion it was too expensive to do as a fun project. for about 50 dollars i could buy a low power laser with a driver, which is doable, but considering the r...
by harmsobuk
Fri Apr 03, 2015 9:36 am
Forum: Automation, sensing and robotics
Topic: Laser cutter
Replies: 13
Views: 3480

Re: Laser cutter

One last question, which website can i get a good laser for the least amount of money? the only site i have searched on so far is ebay, but i don't know it that is the best site when searching for a laser.
by harmsobuk
Thu Apr 02, 2015 5:17 pm
Forum: Automation, sensing and robotics
Topic: Laser cutter
Replies: 13
Views: 3480

Re: Laser cutter

https://www.kickstarter.com/projects/15 ... escription Scroll down to: What materials can it work with? where there are a pair of tables, one for the original spec (2W) laser module and one for the 3W stretch goal laser. Thanks! These are good ideas. It's also a good idea to use it in an area that ...
by harmsobuk
Thu Apr 02, 2015 1:33 pm
Forum: Automation, sensing and robotics
Topic: Laser cutter
Replies: 13
Views: 3480

Re: Laser cutter

Where do you plan to run the laser? It'll make some smoke when you cut, so you need to make sure you have proper ventilation. Just something else to think about ;) I was already planning on doing something like the lazerblade, where the air is directed away from the laser. I also wanted to combine ...
by harmsobuk
Thu Apr 02, 2015 9:47 am
Forum: Automation, sensing and robotics
Topic: Laser cutter
Replies: 13
Views: 3480

Re: Laser cutter

I mainly want to use it for cutting plywood, but if I need an expensive laser for doing so, I might continue this project using a smaller laser, and than maybe change it later. Edit: I thought I saw a vide where it was cutting 3mm plywood, but I can' theme to find it. Maybe I'm thinking of a differe...
by harmsobuk
Wed Apr 01, 2015 5:17 pm
Forum: Automation, sensing and robotics
Topic: Laser cutter
Replies: 13
Views: 3480

Laser cutter

Hi there, I have been thinking about building a laser cutter from scratch, and i need some help with the kind of laser i need and some other things. I made a post on a different forum, but this forum isn't really the most active i have seen, and i doubt i will get a reply within the next week. When ...
by harmsobuk
Sun Mar 01, 2015 7:23 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: mcp23017
Replies: 2
Views: 722

mcp23017

hi there, i finally figured out the i²c bus/mcp23017 (i asked a couple of questions on this forum, but i didn't know you had to write a binary number on the bus :) ). i managed to control a stepper motor using i²c, but only with the a0-7 ports. i did some research, but i still can't figure out how t...
by harmsobuk
Sat Feb 28, 2015 10:57 am
Forum: Other projects
Topic: raspberry pi induction loop
Replies: 0
Views: 470

raspberry pi induction loop

hi there, we (me and a friend) are trying to make an induction loop using the raspberry pi (as a project for school). we made a primary and a secundary coil. the primary will have a pwm signal, and the secundary coil will detect if something changes. we have no idea what capacitor we have to use, an...
by harmsobuk
Tue Feb 24, 2015 6:23 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: i²c commands
Replies: 4
Views: 710

Re: i²c commands

Try this #!/usr/bin/python # (C) 2015 Copyright Dougie Lawson, All rights reserved # Version 0.6 import smbus ADDR = 0x20 IODIRA = 0x00 IODIRB = 0x01 GPIOA = 0x12 GPIOB = 0x13 OLATA = 0x14 OLATB = 0x15 bus=smbus.SMBus(1) bus.write_byte_data(ADDR,IODIRA,0x00) bus.write_byte_data(ADDR,IODIRB,0x00) gl...
by harmsobuk
Tue Feb 24, 2015 5:31 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: i²c commands
Replies: 4
Views: 710

i²c commands

hi there, I have been trying to figure out everything about i²c and the MCP23017. I have hooked up everything, i tested everything, and it now shows up when i run the i2cdetect command (asked this in my last post, turned out te be an image i used for figuring out what pin did what, that was mirrored...
by harmsobuk
Sun Feb 22, 2015 11:02 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: i2cdetect command not found
Replies: 3
Views: 39937

i2cdetect command not found

hi there, i have been trying to figure out i2c for a while now, but i keep running into problems i wanted to connect a mcp23017 to my raspberry pi, and i followed multiple online tutorials. but at one point, i had to type in sudo i2cdetect, but then i get the "sudo: i2cdetect: command not found" err...
by harmsobuk
Fri Feb 20, 2015 7:56 pm
Forum: General programming discussion
Topic: transferring files
Replies: 5
Views: 683

Re: transferring files

i use raspbian, forgot to mention that.
by harmsobuk
Fri Feb 20, 2015 7:41 pm
Forum: General programming discussion
Topic: transferring files
Replies: 5
Views: 683

Re: transferring files

didn't even think about that, seems like a really good idea
thanks :D

Harm
by harmsobuk
Fri Feb 20, 2015 7:36 pm
Forum: General programming discussion
Topic: transferring files
Replies: 5
Views: 683

transferring files

hi there, when programming, i prefer using my normal pc instead of programming directly on the raspberry pi. i made a whole script on my computer, and today i wanted to start debugging it. i ran into a problem trying to put the file on the pi, as i have no idea where it has to go. i saved a file on ...
by harmsobuk
Sat Feb 14, 2015 9:03 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: i²c help
Replies: 5
Views: 751

Re: i²c help

thanks for the quick replies, Using your preferred web search tool to look for "raspberry MCP23017" will give lots of useful information. Two authors I recognise and trust are: http://www.raspberrypi-spy.co.uk/2013/07/how-to-use-a-mcp23017-i2c-port-expander-with-the-raspberry-pi-part-1/ http://natha...
by harmsobuk
Sat Feb 14, 2015 6:50 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: i²c help
Replies: 5
Views: 751

i²c help

Hi there, A while ago, I started building/designing a 7-axis robot arm. i am controlling 7 stepper-motors and a servo with a raspberry pi b+. this requires 29 pins, and since the b+ only has 26 controllable pins, i figured out i needed i²c to expand the amount of pins. I bought the following things ...
by harmsobuk
Tue Feb 03, 2015 7:25 pm
Forum: HATs and other add-ons
Topic: Expansion board
Replies: 3
Views: 1535

Expansion board

hi there, The last month(s) i have been working on a robot arm, controlled by the raspberry pi. I am using stepper motors to move the arm, and the arm itself has 6 axes. i am using a servo to control the hand. it will be a long time before i finish this project, but by just doing some maths, i came ...
by harmsobuk
Sat Jan 10, 2015 5:12 pm
Forum: Beginners
Topic: Raspberry pi voltage
Replies: 2
Views: 508

Raspberry pi voltage

I have been searching online for information about this subject, but on every page the answer is different. What is the output voltage of the raspberry pi? Some people say the voltage is 3.3 volt, and others say it's 5 volt. I want to connect a 5v stepper motor to my pi, and in some video's people j...
by harmsobuk
Sat Jan 10, 2015 11:03 am
Forum: Beginners
Topic: Programming the raspberry pi
Replies: 7
Views: 1048

Re: Programming the raspberry pi

I can think of 4 modules/libraries that give access to the physical gpio pins from Python from an RPi running Raspbian - RPi.GPIO WiringPi PiGPIO RPIO If you are confident in your skills with Python perhaps all you need to do is consult the documentation for those libraries? If those modules are ev...
by harmsobuk
Thu Jan 08, 2015 8:36 pm
Forum: Beginners
Topic: Programming the raspberry pi
Replies: 7
Views: 1048

Re: Programming the raspberry pi

http://www.raspberrypi.org/resources/ http://www.raspberrypi.org/help/physical-computing/ http://www.raspberrypi.org/carrie-anne-philbins-adventures-in-raspberry-pi/ These are the kind of tutorials I meant, they teach python using the raspberry pi. I am searching for a tutorial that teaches the par...
by harmsobuk
Thu Jan 08, 2015 7:34 pm
Forum: Beginners
Topic: Programming the raspberry pi
Replies: 7
Views: 1048

Re: Programming the raspberry pi

http://www.raspberrypi.org/resources/ http://www.raspberrypi.org/help/physical-computing/ http://www.raspberrypi.org/carrie-anne-philbins-adventures-in-raspberry-pi/ These are the kind of tutorials I meant, they teach python using the raspberry pi. I am searching for a tutorial that teaches the par...
by harmsobuk
Thu Jan 08, 2015 4:52 pm
Forum: Beginners
Topic: Programming the raspberry pi
Replies: 7
Views: 1048

Programming the raspberry pi

I have bought a raspberry pi recently, and I started learning python. Because I have used vbscript before, it didn't take me long to learn python. I am searching for a tutorial for controlling the raspberry pi with python. All of the tutorials I see are about learning python using the raspberry pi, ...

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