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by badook
Thu May 01, 2014 6:44 pm
Forum: Automation, sensing and robotics
Topic: [email protected]: doorbell, intercom and more, notified on my android
Replies: 10
Views: 7983

Re: [email protected]: doorbell, intercom and more, notified on my and

In my project I chose sqllite as database, because this way I don't have to have a DB server running. The python code which manages the DB is this one . The server running on the raspberry is this file . Beware that security measures are pretty much absent at the moment. When the app on the smartpho...
by badook
Sun Oct 27, 2013 10:55 pm
Forum: Camera board
Topic: GPU Accelerated Processing Of The Camera Feed
Replies: 10
Views: 8609

Re: GPU Accelerated Processing Of The Camera Feed

I've been struggling to get decent processing speeds for my project. Running some OpenCV filters is quite slow on the 700mhz cpu, and with your work it seems like my lil' robot might finally recognize obstacles a lot faster. I'll definitely try it...Keep up the good work! Edit: Any chance of a Pytho...
by badook
Sat Sep 21, 2013 5:30 pm
Forum: Automation, sensing and robotics
Topic: Wireless touch sensor to send SMS text message
Replies: 2
Views: 1775

Re: Wireless touch sensor to send SMS text message

I think you need a capacitive touch sensor. Sparkfun sells one based on MPR121 for $9.95. A cheaper alternative would be one based on MPR121 , I think it uses the I2C protocol but I'm not 100% sure it can be used wit the Raspberry PI. EDIT: I just read that you need a wireless one. My best guess wou...
by badook
Thu Sep 19, 2013 10:10 am
Forum: Automation, sensing and robotics
Topic: [email protected]: doorbell, intercom and more, notified on my android
Replies: 10
Views: 7983

Re: [email protected]: doorbell, intercom and more, notified on my and

The android application is developed in Java using Eclipse. To receive messages it uses Google's GCM.
If you're interested in the source code send me a pm ;)
by badook
Wed Sep 04, 2013 10:11 pm
Forum: Automation, sensing and robotics
Topic: [email protected]: doorbell, intercom and more, notified on my android
Replies: 10
Views: 7983

[email protected]: doorbell, intercom and more, notified on my android

[email protected] Hi, this is a project I've worked on for some time. It consists of a raspberry pi connected to several sensors + wifi internet, which alerts me on my Android phone of several events. The reasons I decided to start this project are: - I wanted to learn a little of electronics, the practical ...
by badook
Fri Jun 14, 2013 2:08 pm
Forum: Automation, sensing and robotics
Topic: [WIP] Quadrotor Project
Replies: 24
Views: 4409

Re: [WIP] Quadrotor Project

Very interesting, I'd love to make a project like this too, if only I had the time. May I recomend buying the MPU on ebay? $4,32 : (x1) : http://www.ebay.it/itm/MPU-6050-3-Axis-Accelerometer-3-Axis-Gyro-module-3-3V-5V-For-Arduino-/171046300701?pt=LH_DefaultDomain_0&hash=item27d3276c1d&_uhb=1 They ar...
by badook
Fri May 31, 2013 8:46 am
Forum: Other projects
Topic: Normally closed optocoupler/relay
Replies: 3
Views: 2142

Re: Normally closed optocoupler/relay

Thank you for your help.
I have already worked with optocouplers, so that's what popped up in my mind. Now I'll document myself about SPDT relays. :)

Thanks!
by badook
Thu May 30, 2013 8:25 pm
Forum: Other projects
Topic: Normally closed optocoupler/relay
Replies: 3
Views: 2142

Normally closed optocoupler/relay

Hi, I'm trying to interface my existing alarm system to the raspberry. In my alarm system there are several PIR sensors which are normally closed. So if there is no movement keep the circuit closed. I'd like to manually trigger one of these PIR when some event happen. I had thought to use an optocou...
by badook
Thu May 30, 2013 10:10 am
Forum: Automation, sensing and robotics
Topic: Indoor location sensing
Replies: 6
Views: 6224

Re: Indoor location sensing

Actually, if there are many wifi networks in range, you could fingerprint the wifi levels in room and get better precision. This means that you'd need to create a map of wifi networks strength in the room and then check whether a user is "near" to one of the memorized points. The advantage is that i...
by badook
Mon Mar 18, 2013 8:42 am
Forum: Python
Topic: using python with opencv
Replies: 13
Views: 5179

Re: using python with opencv

Depending on what kind of object you are trying to recognize there are several algorithms and implemented solutions available on-line. - One example is a tennis ball: http://wiki.elphel.com/index.php?title=OpenCV_Tennis_balls_recognizing_tutorial (this code is C, but you can translate it in python b...
by badook
Sat Mar 16, 2013 2:25 pm
Forum: HATs and other add-ons
Topic: Maxbotix Ultrasonic Rangefinder - LV-EZ1
Replies: 22
Views: 15961

Re: Maxbotix Ultrasonic Rangefinder - LV-EZ1

Thanks! I'll start experimenting right away!

EDIT:
Here it is, working like a charm! Next step: accelerometer+gyro+magnetometer

Image

Thanks again ;-)
by badook
Fri Mar 15, 2013 5:51 pm
Forum: HATs and other add-ons
Topic: Maxbotix Ultrasonic Rangefinder - LV-EZ1
Replies: 22
Views: 15961

Re: Maxbotix Ultrasonic Rangefinder - LV-EZ1

nice work btidey! For mproved performance and lower cpu usage you could use the library RPIO ( https://github.com/metachris/RPIO ), which features interrupts on input gpios with very little cpu usage and fast response. Also, I just received three ultrasonic sensors, and I was wondering how to connec...
by badook
Mon Mar 04, 2013 10:00 am
Forum: Other projects
Topic: Raspberry pi and 12/24V doorbell
Replies: 5
Views: 2559

Re: Raspberry pi and 12/24V doorbell

Thank you for the extensive and detailed explanation. It was really helpful. I think that now I have a better understanding of what has to be done. I have just other two questions, I promise! If instead of a single diode I were to place 4 as a bridge rectifier, can the resistors be the same? Lastly,...
by badook
Sun Mar 03, 2013 9:44 pm
Forum: Other projects
Topic: Raspberry pi and 12/24V doorbell
Replies: 5
Views: 2559

Re: Raspberry pi and 12/24V doorbell

Ok, I've documented myself about diodes and optocouplers. Do you think that the optocoupler 4N33 would be fine? Also, did you mean 0.5 Ohm and 1 Ohm resistors? Finally apart from connecting the gpio and ground from the raspberry pi to the optocoupler, will I have to use a pulldown resistor? Thanks a...
by badook
Sun Mar 03, 2013 6:52 pm
Forum: Other projects
Topic: Raspberry pi and 12/24V doorbell
Replies: 5
Views: 2559

Re: Raspberry pi and 12/24V doorbell

Ok :cry: ...I'm still pretty new to the electronics world, I thought it would be simpler, but I'll look into it.
Thanks!
by badook
Sun Mar 03, 2013 5:53 pm
Forum: Other projects
Topic: Raspberry pi and 12/24V doorbell
Replies: 5
Views: 2559

Raspberry pi and 12/24V doorbell

Hi, I bought a model A because of it's low power usage, and now I'd love to put it to work. My idea is to have it near the apartment door and connect it to the doorbell, so that when it rings the raspberry notifies me on my phone. I've found several similar projects but all of them either use a wire...
by badook
Wed Feb 27, 2013 6:43 pm
Forum: Troubleshooting
Topic: Model A STILL crashing intermittently
Replies: 11
Views: 1633

Re: Model A STILL crashing intermittently

I agree, but the problem is not the raspberry pi model A, it's a linux problem with the realtek driver for this dongle (quick search: http://google.com/search?hl=en&q=rt2x00usb_vendor_request ). The simplest solution is use another dongle. As for why this only happens with the model A or why the hub...
by badook
Wed Feb 27, 2013 5:04 pm
Forum: Troubleshooting
Topic: Model A STILL crashing intermittently
Replies: 11
Views: 1633

Re: Model A STILL crashing intermittently

Hi jrmedd, after some testing I found out that using a usb hub (not powered) with the model A the problem seems to solve, at least for a few hours. I left it on for about four hours and the connection held up. Instead if I connect the wifi dongle directly to the model A after usually 5-10 minutes it...
by badook
Tue Feb 26, 2013 2:20 pm
Forum: Automation, sensing and robotics
Topic: Will Minoru 3D Webcam work?
Replies: 1
Views: 1197

Re: Will Minoru 3D Webcam work?

Well, since usb uses 5V, and Watts = Amps x Volts, the webcam draws 0.3A. Assuming you have a rev2 board, looking on the internet, it says that for devices which use 250mA there are no problems, except that if hotplugged it may make the rPI reboot because of a voltage drop. 0.3 should be ok, but I'd...
by badook
Tue Feb 26, 2013 2:07 pm
Forum: Automation, sensing and robotics
Topic: PWM for servos, motors, and LEDs plus.
Replies: 22
Views: 34018

Re: PWM for servos, motors, and LEDs plus.

This is very useful indeed. I only wish it was fully open source, because it would be more in line with the linux and raspberry pi philosophy ;) For those who prefer open source and/or are familiar with servoblaster, there is another project called pi-blaster specifically for dc motors which also us...
by badook
Tue Feb 26, 2013 12:10 pm
Forum: Arch
Topic: Model A and B interchangeable SD card
Replies: 6
Views: 1091

Re: Model A and B interchangeable SD card

I flashed another sdcard with Arch, and the same issue happens....sigh...I think the board is defective.
by badook
Mon Feb 25, 2013 4:48 pm
Forum: Arch
Topic: Model A and B interchangeable SD card
Replies: 6
Views: 1091

Re: Model A and B interchangeable SD card

hey sdjf, do you mean CTRL-ALT-DEL over ssh or with an attached keyboard? The part of everything.log relative to the last boot is the following: http://pastebin.com/sYBbAHrQ (Yes, the last line is truncated in the log). What's curious is that the last line was written at 16:37:42 and is truncated as...
by badook
Mon Feb 25, 2013 4:35 pm
Forum: Arch
Topic: Model A and B interchangeable SD card
Replies: 6
Views: 1091

Re: Model A and B interchangeable SD card

I set up the os on the sd card about a month ago, but it's fully updated. I'll reinstall archlinux on another sd card and try again...but I'm afraid it's a board defect. The reported temperature never goes over 33° but it just stops working...sigh.
by badook
Mon Feb 25, 2013 3:38 pm
Forum: Arch
Topic: Model A and B interchangeable SD card
Replies: 6
Views: 1091

Model A and B interchangeable SD card

Hi, I recently bought a model A raspberry, because of it's lower power usage. The first thing I did when it arrived was to take the sd-card from my model B rev2 (with arch loaded) and I plugged it in the model A. At first everything worked flawlessly, it booted and I logged in through ssh without pr...
by badook
Mon Feb 25, 2013 10:31 am
Forum: Automation, sensing and robotics
Topic: Yet more MPU6050 demo code
Replies: 122
Views: 93090

Re: Yet more MPU6050 demo code

I'm very interested in integrating the HMC5883L magnetometer too!

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