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by MangoKid
Tue Jul 23, 2019 5:02 pm
Forum: General discussion
Topic: PreBuilt OpenCv and ROS Image for the Raspberry Pi 4
Replies: 9
Views: 2185

Re: PreBuilt OpenCv and ROS Image for the Raspberry Pi 4

Wifi does work but it is not setup to connect to anything. You have to edit the

Code: Select all

wpa_suplicant
file.

Good point about OpenCV I will see if there is a nice way to have both of them on there. CV 4 is excellent but I think it cant yet be bridged nicley to ROS.
by MangoKid
Mon Jul 08, 2019 8:02 pm
Forum: General discussion
Topic: PreBuilt OpenCv and ROS Image for the Raspberry Pi 4
Replies: 9
Views: 2185

PreBuilt OpenCv and ROS Image for the Raspberry Pi 4

Hello All, I have attached a link below that has a prebuilt image with both ROS and OpenCV prebuilt. I intend to maintain this image moving forward so if there are any issues at all please mention them here and I will be sure to address them. This image does not contain any malicous software or anyt...
by MangoKid
Thu Dec 24, 2015 10:54 am
Forum: HATs and other add-ons
Topic: Designing a Raspberry Pi Hat
Replies: 1
Views: 1378

Designing a Raspberry Pi Hat

I think maybe Raspberry Pi Hats should have their own category in the forum, there are more and more of them popping up all the time. Anyway I brought this up to a friend at Openfet and he said he would put some time into making a Hat template in KiCad. He isn't great at promoting so i though I woul...
by MangoKid
Wed Apr 22, 2015 7:15 pm
Forum: Automation, sensing and robotics
Topic: Python Multi-Stepper Control: SlushEngine
Replies: 7
Views: 1573

Re: Python Multi-Stepper Control: SlushEngine

yes it most certainly can.

It is a bipolar stepper motor with 1.3A per phase so it would be no trouble for the SlushEngine
by MangoKid
Wed Apr 22, 2015 3:23 am
Forum: Automation, sensing and robotics
Topic: Python Multi-Stepper Control: SlushEngine
Replies: 7
Views: 1573

Re: Python Multi-Stepper Control: SlushEngine

Thanks! We intend the product on our site to be identical. We have spent a good amount of time testing and developing on this board and we are confident with its performance. However if major issues are raised by the community we may make changes based on that feedback. If the kickstarter goes well ...
by MangoKid
Mon Apr 20, 2015 7:13 pm
Forum: Automation, sensing and robotics
Topic: Python Multi-Stepper Control: SlushEngine
Replies: 7
Views: 1573

Python Multi-Stepper Control: SlushEngine

Hello all, This is my first open source project and i would like to get as much feedback as possible. We are currently kick-starting the project so that we can build it to a proper quality standard. https://www.kickstarter.com/projects/144859729/slushengine-stepper-motor-driver The SlushEngine was d...
by MangoKid
Sat Oct 19, 2013 3:30 pm
Forum: Automation, sensing and robotics
Topic: control of an actuator
Replies: 1
Views: 680

Re: control of an actuator

What you are looking for is a DAC (Digitial-to-Analog). These are not the most common thing to find on a breadboard. I would recommend soldering this chip to a breakout board and connecting it to the Pi's SPI port. http://www.maximintegrated.com/datasheet/index.mvp/id/1118 The chip is pretty cheap a...
by MangoKid
Thu Aug 22, 2013 3:43 pm
Forum: Automation, sensing and robotics
Topic: Is there I2C over radio? (or something similar)
Replies: 5
Views: 8366

Re: Is there I2C over radio? (or something similar)

I hate to say it but there arnt many rf sensors out there. The easiest way would be to find a sensor with serial output and run it into an xbee. You can then mount the xbee on the raspberry pi. Keep in mind that compatability between rf devices is very limited. They are usual only designed to work w...
by MangoKid
Mon Aug 12, 2013 2:58 pm
Forum: Automation, sensing and robotics
Topic: Want to use Sharp distance rangers on RPi?
Replies: 1
Views: 682

Re: Want to use Sharp distance rangers on RPi?

Thats pretty cool! I guess you are using a mutli channel i2c adc?

One downside to these sensors is the cost. Even off ebay they are 13$ at the cheapest. with 27 thats about 350$
by MangoKid
Mon Aug 12, 2013 2:54 pm
Forum: Automation, sensing and robotics
Topic: Pi-Speed Camera
Replies: 3
Views: 2061

Re: Pi-Speed Camera

I think this would be possible. Use a low res camera and take pictures at a high frame rate (if your field of view is wide enough 24fps should be fine). Then use CV blob functions to find the bus and the shift of the bus. This system will get screwed up if there are other cars in the field of view. ...
by MangoKid
Mon Aug 12, 2013 2:47 pm
Forum: Automation, sensing and robotics
Topic: Is there I2C over radio? (or something similar)
Replies: 5
Views: 8366

Re: Is there I2C over radio? (or something similar)

The most obvious way would just be to use two PIs on a wifi network. One reading the sensor and sending the data the other receiving and controlling. But thats probably pretty pricy. The best way to do this in my opinion would be Bluetooth. Some Bluetooth modules have an I2C protocol mixed in with t...
by MangoKid
Tue Jul 09, 2013 7:44 pm
Forum: Automation, sensing and robotics
Topic: Quadcopter
Replies: 2
Views: 1235

Re: Quadcopter

I have done this using long range wifi over rf systems (4km ish). It totally depends on how you are managing you network. I was able to run 640*480 video at 20fps and control the copter without noticeable lag. You will run into issues when you router/Ethernet card is controlling the packets. The con...
by MangoKid
Mon Jul 08, 2013 1:12 pm
Forum: Automation, sensing and robotics
Topic: Motor questions
Replies: 5
Views: 1130

Re: Motor questions

A stepper would work great for dispensing the grain. The best way to control the flow is to use a turbine wheel. http://www.google.com/url?sa=i&rct=j&q=&esrc=s&source=images&cd=&cad=rja&docid=Nmfb918zAtOxcM&tbnid=Z9AF6JMwW9Cr2M:&ved=0CAUQjRw&url=http%3A%2F%2Fwww.foundry-planet.com%2Findex.php%3Fid%3...
by MangoKid
Tue Jul 02, 2013 4:00 pm
Forum: Automation, sensing and robotics
Topic: Sensor and GPIO problems (python)
Replies: 3
Views: 1133

Re: Sensor and GPIO problems (python)

You only ever set the LED once in your function and its always to 1 (or HIGH). It is going to be stuck there unless you clear them all at some point.

set them low at the beginning of each loop maybe.
by MangoKid
Thu Jun 27, 2013 8:56 pm
Forum: Automation, sensing and robotics
Topic: Magnetic reed switch
Replies: 3
Views: 7023

Re: Magnetic reed switch

You most definitely can do it out of the box. If you use the included RPGPIO library (there are a ton of tutorials on the interweb) and a read switch from the 3.3v source and one of the GPIO pins then you should be good to go. As a disclaimer using heavy/industrial reed switches might be a bad idea,...
by MangoKid
Tue Jun 18, 2013 2:12 pm
Forum: Automation, sensing and robotics
Topic: efficiency of Raspberry Pi Robots
Replies: 16
Views: 3181

Re: efficiency of Raspberry Pi Robots

It totally depends how you program it. If you are using python and a digital line sensor with the on-board Pi GPIO i would say its going to be the same speed. If you are using an IO expander (over i2c) to do all of the work it will probably be slower. The final option is hard-coding the Pi. This is ...
by MangoKid
Thu Jun 13, 2013 3:18 pm
Forum: Automation, sensing and robotics
Topic: Question about using raspberry pi to drive two servos, laser
Replies: 9
Views: 3998

Re: Question about using raspberry pi to drive two servos, l

Are you wiring multiple servos on 1 channel? i know some people have done this for hexa pods, because some legs make the same motions.

I dont think it works for quadrapeds though...
by MangoKid
Thu Jun 13, 2013 1:36 pm
Forum: Automation, sensing and robotics
Topic: Question about using raspberry pi to drive two servos, laser
Replies: 9
Views: 3998

Re: Question about using raspberry pi to drive two servos, l

I hate to say it but its never that easy. You cant plug the laser into the GPIO for many reasons, the most important being that the voltage levels are probably different. Your best bet would be to use a basic relay module. Something like this http://compare.ebay.com/like/160831617523?var=lv<yp=All...
by MangoKid
Tue Jun 11, 2013 5:34 pm
Forum: Automation, sensing and robotics
Topic: Portable power
Replies: 1
Views: 574

Re: Portable power

One option is to power the Pi via a DC to DC converter. This can provide you with 5v and will give you all the current that you need. The Pi can be powered through the header pins it doesn't necessarily have to be powered through the usb jack. Another option is to wire a USB hub to a battery. The be...
by MangoKid
Mon Jun 03, 2013 7:21 pm
Forum: Automation, sensing and robotics
Topic: Connecting stepper motor to Raspberry pi
Replies: 33
Views: 12622

Re: Connecting stepper motor to Raspberry pi

Its rated at 5v... but now that you mention it i think i have used them with the MSP430 LP (which is 3.3) So i retract my statement about the 5v thing.

That being said it is still easier to use a stepper driver with an integrated controller.
by MangoKid
Mon Jun 03, 2013 3:06 pm
Forum: Automation, sensing and robotics
Topic: Connecting stepper motor to Raspberry pi
Replies: 33
Views: 12622

Re: Connecting stepper motor to Raspberry pi

The ULN chip cannot be connected to the Pi. It is uses 5v signals and the Pi can only provide you with 3.3v. A way around this is to use a level shifter to bring the 3.3v to 5v. An alternative to this would be to use a module like: http://www.robotshop.com/ca/pololu-single-bipolar-stepper-motor-driv...
by MangoKid
Wed May 29, 2013 12:01 pm
Forum: Automation, sensing and robotics
Topic: Raspberry Pi Handwriting Recognition
Replies: 5
Views: 3624

Re: Raspberry Pi Handwriting Recognition

There is a project on github (https://github.com/haywood/Handwriting-Recognition-System) for hand writing recognition. Its done in C but it look pretty straight forward. It uses open cv which is a package that works great on the PI. Install open cv, clone this project onto your PI and then compile i...
by MangoKid
Tue May 28, 2013 2:50 pm
Forum: Automation, sensing and robotics
Topic: Raspberry Pi for servo-systems
Replies: 2
Views: 1017

Re: Raspberry Pi for servo-systems

One of the easiest ways of doing this with a single power supply is using something like this. http://www.karlssonrobotics.com/cart/micro-maestro-6-channel-usb-servo-controller/?gclid=CJmk5uGFubcCFUyY4AodJSAALA These are very easy to use and you wont risk overloading the PI. It works via serial over...
by MangoKid
Tue May 28, 2013 12:14 pm
Forum: Automation, sensing and robotics
Topic: automatic headlights, light sensing
Replies: 1
Views: 1204

Re: automatic headlights, light sensing

http://learn.adafruit.com/basic-resistor-sensor-reading-on-raspberry-pi/basic-photocell-reading Ive tried this and it works well. If you need the accuracy you are probably better off using one off these. http://www.seeedstudio.com/depot/grove-i2c-color-sensor-p-854.html It says color sensor but it a...
by MangoKid
Tue May 28, 2013 12:11 pm
Forum: Automation, sensing and robotics
Topic: Colour Sensor
Replies: 1
Views: 536

Re: Colour Sensor

This one might be pretty tough to use with the pi. Working with timing in python can be a bit unreliable. I would processing it with an MCU and then sending it to the PI. The best option (if you dont need high speed) is one of these bad boys. http://www.seeedstudio.com/depot/grove-i2c-color-sensor-p...

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