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by Robo
Fri Sep 26, 2014 8:28 pm
Forum: Automation, sensing and robotics
Topic: Raspberry Pi + MSP430 controlling Tamiya TT-01 RC car
Replies: 20
Views: 13318

Re: Raspberry Pi + MSP430 controlling Tamiya TT-01 RC car

OK, I tried using WiringPi library before, and it didn't work.

https://projects.drogon.net/raspberry-p ... m-library/

It was fine for blinking some LEDs, but wouldn't move a servo.

Can you give some description on how your library works?
by Robo
Fri Sep 26, 2014 8:01 pm
Forum: Automation, sensing and robotics
Topic: Raspberry Pi + MSP430 controlling Tamiya TT-01 RC car
Replies: 20
Views: 13318

Re: Raspberry Pi + MSP430 controlling Tamiya TT-01 RC car

Hi, we need to send PWM (pulse width modulation) signals to the throttle and servo of the Tamiya. The Pi is running Linux and not a real time operating system, so it can't send accurate pulse width signals. That's what the MSP430 is for.
by Robo
Mon Apr 15, 2013 10:51 am
Forum: Graphics, sound and multimedia
Topic: Having trouble getting video stream from Logitech C920
Replies: 2
Views: 2981

Having trouble getting video stream from Logitech C920

My goal is to have the Pi streaming video/audio from Logitech C920 webcam, so another computer can view the stream in Skype like quality. I thought it would be easy because the webcam has hardware h.264 encoding, and the Pi's GPU can decode h.264, it means I should get super high quality stream righ...
by Robo
Wed Apr 03, 2013 8:31 am
Forum: Graphics, sound and multimedia
Topic: Bad quality video capture from Logitech C920
Replies: 3
Views: 2326

Re: Bad quality video capture from Logitech C920

Just tried it, didn't help. Looks to have gotten worse to be honest. I used the same command as before, and it appears to have only caught one frame, i.e. I move the webcam around, but the video only shows one image.
by Robo
Wed Apr 03, 2013 4:59 am
Forum: Automation, sensing and robotics
Topic: Raspberry Pi + MSP430 controlling Tamiya TT-01 RC car
Replies: 20
Views: 13318

Re: Raspberry Pi + MSP430 controlling Tamiya TT-01 RC car

Hi, I am doing the same thing with Raspi and MSP430 launch pad, but have a lot of isues reading / writing to the UART over usb I'm using UART to communicate, but not over USB. In fact, I don't even know how to do that, is there an advantage? If you look at my image, the white wire from the Pi to th...
by Robo
Tue Apr 02, 2013 9:32 pm
Forum: General discussion
Topic: Power switch now available for Pi
Replies: 48
Views: 38828

Re: Power switch now available for Pi

Also, thought i'd share this with anybody. Looks like there is native support for a reset switch on rev2 boards. I plan on doing adding this to my project. Not sure if it has been shared yet, but just letting more know. http://raspi.tv/tag/raspberry-pi-reset-switch Just to be clear, the reset switc...
by Robo
Tue Apr 02, 2013 11:23 am
Forum: Graphics, sound and multimedia
Topic: Bad quality video capture from Logitech C920
Replies: 3
Views: 2326

Bad quality video capture from Logitech C920

My goal is to stream video similar in quality to Skype, for now I'm trying to capture a video from the Logitech C920 webcam. I'm using ffmpeg, the command is: avconv -f video4linux2 -s 320x240 -t 30 -i /dev/video0 ~/test.mpg The command I used to play the video is: ffplay -i test.mpg My questions ar...
by Robo
Tue Apr 02, 2013 1:22 am
Forum: Automation, sensing and robotics
Topic: Raspberry Pi + MSP430 controlling Tamiya TT-01 RC car
Replies: 20
Views: 13318

Re: Raspberry Pi + MSP430 controlling Tamiya TT-01 RC car

You use a different approach. On my cheapo RC cars I try to tap into the controller module and simulate the L/R F/B pulse being received from the radio transmitter. I've not considered detaching the servo cables as I'd assumed I'd then have problems supplying the power. Time to open up the cheapo R...
by Robo
Tue Apr 02, 2013 1:14 am
Forum: Automation, sensing and robotics
Topic: Raspberry Pi + MSP430 controlling Tamiya TT-01 RC car
Replies: 20
Views: 13318

Re: Raspberry Pi + MSP430 controlling Tamiya TT-01 RC car

(Mind you - I just googled for the TT-01 - the price of the controller is not significant!!! - its out of my pocket money range) Simon Preciously why I bought second hand! I didn't need to put it together myself, it came with everything, plus the motor, ESC, and other parts were already upgraded. H...
by Robo
Mon Apr 01, 2013 11:29 am
Forum: Automation, sensing and robotics
Topic: Raspberry Pi + MSP430 controlling Tamiya TT-01 RC car
Replies: 20
Views: 13318

Re: Raspberry Pi + MSP430 controlling Tamiya TT-01 RC car

I'm not sure I understand the question. The only thing I've connected from the car is the servo and the ESC, both use the red/black/white wires, the white one being the signal wire receiving PWM signal. So, controlling the servo and ESC is identical, in fact in my code I call them servo1 and servo2....
by Robo
Mon Apr 01, 2013 10:24 am
Forum: Automation, sensing and robotics
Topic: Quadrocopter... RC receiver?
Replies: 5
Views: 2002

Re: Quadrocopter... RC receiver?

See here:

http://www.raspberrypi.org/phpBB3/viewt ... 2&p=322044

I setup the Pi as a Wireless Access Point for remote control. Typical radio control receivers are only 2 or 3 channels, so I don't see how it can work for you, especially with all the sensors.
by Robo
Mon Apr 01, 2013 10:16 am
Forum: Automation, sensing and robotics
Topic: Raspberry Pi + MSP430 controlling Tamiya TT-01 RC car
Replies: 20
Views: 13318

Raspberry Pi + MSP430 controlling Tamiya TT-01 RC car

http://i.imgur.com/LVMqyHp.jpg http://i.imgur.com/LVMqyHp.jpg Here's the video of it working: http://youtu.be/plBGQRBN6Qo The Pi is powered by an USB battery pack, the MSP430 is mounted on the breadboard, powered by the 3v3 GPIO from the Pi, commands are sent to MSP430 using UART. This all means th...
by Robo
Sun Feb 10, 2013 2:05 am
Forum: Automation, sensing and robotics
Topic: Most compact way to link hookup wires to GPIO?
Replies: 5
Views: 1020

Re: Most compact way to link hookup wires to GPIO?

Thank you, just needed the right search term. Now I just have to wait for Chinese New Year holiday to be over so the sellers go back to business.
by Robo
Sun Feb 10, 2013 1:46 am
Forum: Automation, sensing and robotics
Topic: Most compact way to link hookup wires to GPIO?
Replies: 5
Views: 1020

Most compact way to link hookup wires to GPIO?

Currently I've plugged a ribbon cable to GPIO, then use my hook up wires on the other end of the ribbon cable. However, while it works as prototype, the ribbon cable is bulky, I only need to use 2 or 3 wires, so I'm looking for a more compact solution. Ideally, there would be a socket that can conve...
by Robo
Tue Jan 29, 2013 8:34 pm
Forum: Automation, sensing and robotics
Topic: Best way to supply multiple voltages from one power source?
Replies: 5
Views: 1162

Re: Best way to supply multiple voltages from one power sour

joan wrote:eBay.

Search for ubec. I bought mine for £1.50.
I've had a look, majority outputs 5V, a small number supports 3.3V. When you suggested ubec, you do mean I need to get both regulators right?
by Robo
Tue Jan 29, 2013 11:55 am
Forum: Automation, sensing and robotics
Topic: Best way to supply multiple voltages from one power source?
Replies: 5
Views: 1162

Best way to supply multiple voltages from one power source?

I have a 7.2V battery power source, and need to use it to power the Pi at 5V, and the TI MSP430G2 which allows 1.8V to 3.6V. I guess I'll need a voltage regulator for 5V, and another one for 3V. Is there a better way to do this? According to MagPi issue 6, they recommend the LM2576T-5.0 voltage regu...
by Robo
Sat Dec 08, 2012 10:31 am
Forum: Automation, sensing and robotics
Topic: Help controlling Futaba S3003 servo using RPi
Replies: 4
Views: 4039

Re: Help controlling Futaba S3003 servo using RPi

I've tried hooking an LED to the GPIO pin. When I run the servo program it lights up, when I quit the LED turns off, so it's definitely the correct pin. I've done the same with multimeter, turn servo program on, multimeter gets a voltage reading, turn program off, multimeter says zero. But when I li...
by Robo
Sat Dec 08, 2012 8:08 am
Forum: Automation, sensing and robotics
Topic: Help controlling Futaba S3003 servo using RPi
Replies: 4
Views: 4039

Help controlling Futaba S3003 servo using RPi

I'm fine with software programming, but new to electronics. I'm trying to control the Futaba S3003 servo in my RC car using RPi. The spec is here: http://www.futaba-rc.com/servos/analog.html http://www.servocity.com/html/s3003_servo_standard.html I connected 4x 1.5V AA batteries in series to power t...
by Robo
Fri Nov 30, 2012 10:33 am
Forum: Automation, sensing and robotics
Topic: How to replace receiver on RC car with Pi?
Replies: 2
Views: 2775

How to replace receiver on RC car with Pi?

I have a Tamiya TT-01 RC car. My goal is to control it using the Pi instead of the radio control. How do I go about it? I'm fine with programming, but new to robotics and electronics. On the RC car, the receiver has cables connected to the servo and ESC. I assume the receiver sends signals through t...
by Robo
Wed Nov 21, 2012 10:55 am
Forum: Beginners
Topic: What's the Gertboard for that can't be done using GPIO?
Replies: 5
Views: 1317

Re: What's the Gertboard for that can't be done using GPIO?

And how is "an external power source" connected to that motor? And where on a motor do you connect the 'go' signal? The Gertboard takes that 'go' signal, and uses it to control the 'external power' thereby controlling the motor. Another way of looking at it: motors are stupid. They need something t...
by Robo
Tue Nov 20, 2012 10:14 pm
Forum: Beginners
Topic: What's the Gertboard for that can't be done using GPIO?
Replies: 5
Views: 1317

What's the Gertboard for that can't be done using GPIO?

What's the Gertboard/PiFace for? I have no problem with software programming, but a bit clueless on hardware and electronics. From what I can gather, expansion boards are used to connect to sensors, servos, motors, etc. Also from what I can gather, Pi's GPIO can send and receive signals. I've read f...
by Robo
Fri Sep 21, 2012 11:59 am
Forum: Bare metal, Assembly language
Topic: Cambridge OS tutorial, OK05 SOS solution not working
Replies: 3
Views: 1871

Re: Cambridge OS tutorial, OK05 SOS solution not working

OK, that worked, could you please explain what it does? That option doesn't appear in http://elinux.org/RPi_config.txt

Also, is it possible to edit the code to make it work without using that option?

I appreciate your help by the way
by Robo
Fri Sep 21, 2012 6:42 am
Forum: Bare metal, Assembly language
Topic: Cambridge OS tutorial, OK05 SOS solution not working
Replies: 3
Views: 1871

Cambridge OS tutorial, OK05 SOS solution not working

http://www.cl.cam.ac.uk/freshers/raspberrypi/tutorials/os/ok05.html I've been working my way through the tutorials, in OK05 it should make the LED flash a SOS signal. I couldn't get it to work, so compiled their provided solution verbatim and it didn't work either. The LED stays on instead of flashi...

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