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Electronics / Re: Good transmitter for RC/robot
« Last post by Chrabban on August 05, 2014, 02:08:04 AM »
tnx for the responce, i am just wondering if that will be do, i think i need more CH, i am thinking about getting a robot arm, video switch, and ir lights, also, might add something more :P is there someting like this that are for the 2,4ghz http://hackaday.com/2012/07/11/remote-control-with-an-xbee-and-a-propeller/ or that are modular, i also found this one http://www.jetimodel.com/en/katalog/Transmitters/@produkt/DS-14/ but i dont kno alot about it :P and it cost to mutch :/

is it hard to make DIY controler ?
Software / Re: Voice Recognition Car Codes
« Last post by APJ1234 on August 04, 2014, 06:44:47 PM »
I have follow every single steps on the link provided above and still got this error...

Build started 4.8.2014 at 20:37:13
avr-gcc -I"C:\My_Robots\Axon2_WebbotLib\..\WebbotLib"  -mmcu=atmega640 -Wall -gdwarf-2 -std=gnu99 -DF_CPU=16000000UL -O0 -funsigned-char -funsigned-bitfields -fpack-struct -fshort-enums -MD -MP -MT Axon2_WebbotLib.o -MF dep/Axon2_WebbotLib.o.d  -c  ../Axon

../Axon2_WebbotLib.c:3:23: error: sys/axon2.h: No such file or directory
../Axon2_WebbotLib.c:5:22: error: hardware.h: No such file or directory
../Axon2_WebbotLib.c: In function 'appInitHardware':
../Axon2_WebbotLib.c:13: warning: implicit declaration of function 'uartInit'
../Axon2_WebbotLib.c:13: error: 'USB_UART' undeclared (first use in this function)
../Axon2_WebbotLib.c:13: error: (Each undeclared identifier is reported only once
../Axon2_WebbotLib.c:13: error: for each function it appears in.)
../Axon2_WebbotLib.c:13: error: 'USB_BAUD' undeclared (first use in this function)
../Axon2_WebbotLib.c:16: error: 'USB_ACTIVATE' undeclared (first use in this function)
../Axon2_WebbotLib.c:18: warning: implicit declaration of function 'led_off'
../Axon2_WebbotLib.c: In function 'appInitSoftware':
../Axon2_WebbotLib.c:25: warning: implicit declaration of function 'marqueeGetWriter'
../Axon2_WebbotLib.c:25: error: 'marquee' undeclared (first use in this function)
../Axon2_WebbotLib.c:25: warning: passing argument 1 of 'rprintfInit' makes pointer from integer without a cast
../Axon2_WebbotLib.c:26: warning: implicit declaration of function 'marqueeSetCharDelay'
../Axon2_WebbotLib.c:27: warning: implicit declaration of function 'marqueeSetEndDelay'
../Axon2_WebbotLib.c: In function 'appControl':
../Axon2_WebbotLib.c:36: warning: implicit declaration of function 'marqueeIsActive'
../Axon2_WebbotLib.c:36: error: 'marquee' undeclared (first use in this function)
make: *** [Axon2_WebbotLib.o] Error 1
Build failed with 9 errors and 7 warnings...

Electronics / Re: full vs half h-bridge
« Last post by waltr on August 04, 2014, 01:04:57 PM »
Two half-bridges is an H-bridge. The difference in terminology is that the two half-bridges are in two separate chips but are wired and controlled together as a single H-bridge. One reason to do this is power handling and heat dissipation.
Software / Re: using the iphone as an rc transmitter
« Last post by waltr on August 04, 2014, 01:01:23 PM »
Serial protocol over BlueTooth.
Electronics / Re: Good transmitter for RC/robot
« Last post by DiegoChavez on August 03, 2014, 07:22:19 PM »
I would go for spektrum the dx5 is the cheapest fir 5 channels ( 1 switch apart from the 2 joysticks) and there are plenty more, dx6, dx7, dx8, etc.
Software / Ecstatic to have finally programmed my Axon2
« Last post by shiggity on August 03, 2014, 07:00:01 PM »
Good news everyone!

I just uploaded 'hello world' to my Axon2 and it said hi back to me :)

I'm ecstatic about this because i've had my Axon2 since 2011 but have always had so much trouble with it I could never get anything going.  Just so much fuss with bootloaders and needing 32 bit, ugh! I have tried countless times previous, to no avail. It just wasn't as easy as the BASIC Stamp or Arduino for me.

Well some time has passed, Im a much better programmer (and perhaps a much better instruction follower) and I finally got it working! So psyched!

How'd I do it? (Just in case there's someone out there as clueless as I was)
I'm on a mac now, which brought it's own challenges - but it worked out in the end. To get around the bootloader & 32 bit windows require I bought a Pololu hardware programmer. I decided to listen to the experts here and now I'm using Webbotlib to make my files. Then, I use avrdude to push them over onto the Axon2 (thankfully crosspack makes it not too hard to setup avrdude on mac).

Anywho, just wanted to post. I'm super psyched to have gotten my dev environment setup here for the Axon2 and am looking forward to many projects in the future with it!

Take care all,

Electronics / Good transmitter for RC/robot
« Last post by Chrabban on August 03, 2014, 03:21:01 PM »
Hello everyone, i need some help to find a transmitter, i am going to build a Robot/RC vehicle, i am going to use it for FPV (with pan/tilt) and i want to be able to use some on/off switch, and be able to just push a button and it dose a sequense of things,

What controler is good for all this ? :) it whold be nice if i can change the frequency (change modual)
what is needed to make a Car/robot make a sequense ?

Tnx for all the help :)
Electronics / full vs half h-bridge
« Last post by Noobita on August 03, 2014, 09:37:52 AM »
Hi everyone,

I already searched the for this topic, but i didn't came across with nothing. SO, if you could explain me what are the diferences between a full and a half h-bridge and what are the adavantages of each one i would be grateful.

I know that a full h-bridge can drive a motor in either way and that a half h-bridge only can drive the same motor in one way. So, what are the advantages of using a half bridge? For example, the dynamixel uses two half h-bridge to drive the motor. Why not use a full h-bridge?

Misc / what are your biggest beefs with robotics companies today?
« Last post by shiggity on August 02, 2014, 12:01:52 PM »
I want to do some brainstorming about the robotics marketplace. I think this prompt would be a great way to learn from you guys, as I am fairly new to the industry and still getting a lay of the land.

Here I 'll start it off with my shortlist so far--
What are the top 10 biggest problems with the current robotics companies & robotics product offerings:
  • Most companies have their software locked up, and make it difficult for hobbyist to tinker and customize their robots.
  • Most companies patent their important bits (whether mechanical/electrical/software), so others cannot also use them, rather than open-sourcing them and helping the greater robotics community grow it leaves others trying to find ways around the patents.
  • Most companies make robots that don't do anything! (everyone seems to be making little educational kits that do only the most basic things like line following, light seeking, etc.) They don't do anything.
  • Most robots made by existing companies are not cost effective, they are not 'investments' (except for robot arms maybe in factories) but are more like 'toys'. You know you will 'lose money' on the toy, but thats okay because the purpose of the toy is to produce joy not to produce profit.
  • Most robotics companies today are not making actual autonomous machines, mostly just remote control devices, electrical components and mechanical parts (gears, enclosures, etc.).
etc.. etc..

Add your own list! Please! I would very much like to hear others opinions.
Mechanics and Construction / Re: Building a simple robot..... need advice
« Last post by jkerns on August 02, 2014, 11:33:40 AM »
I suspect that the simplest to program and low cost choice for controlling your servo would be one of the Arduino boards. They will have more capability than you need, but you aren't going to find anything much less expensive.

The Arduino will run off a USB and supply what you need for the pulse modulated signal to command a servo position, but I suspect that you will need a bit more juice for the actual servo power than you can get from a USB.

Many servo motor controlled arms that I have seen can be jerky and bouncy - you would want something that has some spring to it to actually touch the ipad.
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