If you were Registered and logged in, you could reply and use other advanced thread options
|
Posted by on February 1, 2007, 8:04 am
Hi guys,
I'd like to show you my mobile robot based on the HandyBoard
controller. Pls have a look at http://robot.proof.cz
Basic info:
* 2 MHz microprocessor Motorola 68HC11.
* 32 kB RAM, battery backed.
* Drives up to 4 DC motors. I've changed the two L293D circuits
with four SN754410NE so I can now control DC motors with up to 2A
constant or 2.4A peak power consumption. (See H-bridges)
* Two motor outputs can be used to control a stepper motor.
* 16 x 2 LCD display.
* Two fully programmable buttons, potentiometer with 0-255 range
and a piezo buzzer.
* 7 analog and 9 digital inputs. All of them powered for use with
active sensors.
* 9.6V NiCd battery pack. Charging is done by a special interface
adapter or directly using the main board. Just connect a power adapter
and that's it.
* A 38kHz infra red receiver/transmitter. It's not connected at
the moment, I'm working on a remote digital radio control.
* 8 pin powered serial connector interface with up to 1 Mbaud
transmission speed.
* Easily expandable using the expansion board.
|
|
Posted by werty on February 3, 2007, 11:12 pm
On Feb 1, 6:04 am, nucl...@gmail.com wrote:
> Hi guys,
> I'd like to show you my mobile robot based on the HandyBoard
> controller. Pls have a look athttp://robot.proof.cz
> Basic info:
> * 2 MHz microprocessor Motorola 68HC11.
> * 32 kB RAM, battery backed.
> * Drives up to 4 DC motors. I've changed the two L293D circuits
> with four SN754410NE so I can now control DC motors with up to 2A
> constant or 2.4A peak power consumption. (See H-bridges)
> * Two motor outputs can be used to control a stepper motor.
> * 16 x 2 LCD display.
> * Two fully programmable buttons, potentiometer with 0-255 range
> and a piezo buzzer.
> * 7 analog and 9 digital inputs. All of them powered for use with
> active sensors.
> * 9.6V NiCd battery pack. Charging is done by a special interface
> adapter or directly using the main board. Just connect a power adapter
> and that's it.
> * A 38kHz infra red receiver/transmitter. It's not connected at
> the moment, I'm working on a remote digital radio control.
> * 8 pin powered serial connector interface with up to 1 Mbaud
> transmission speed.
> * Easily expandable using the expansion board.
If the motor needed smooth DC , you must
use "H" bridge .
Switch mode circuits are more powerful .
You need only low cose bipolar transistors
and a little bit of inductor .
coils close to the value of the motors
inductance will work .
These self oscillating bipolar circuits will
rise 10 amps into a motor in milliseconds .
You only need to turn them off , they
turn on by themselves .
One circuit to drive the ground based motor
, positive and another to drive it negative .
This circuit is far more fault tolerant
and easier to control .
I cant understand why colleges dont teach
these better methods .
But i know why i left college after
half a semester !
The proof is in commercial stuff like
low cost power supplies .
They only use
1) single bipolar ,
2) self oscillating ,
3) switch mode , "forward" converters,
not fly backs .
I think its clever to nix the always
present problem of driving the 1 vdc base
of a bipolar .
Its just a 2nd winding on the core !
Now i can fully saturate it for 90% efficiency ,
unlike your H bridge that needs a very
large heat sink !
If your friends explain a complicated
I.C. controlled "switcher" , it is
NOT what im talking about .
Single bipolar , self-oscillating ,
and stopped by the simplist .03 amp
control .
|
| Similar Threads | Posted | | http://robot.pro <- Domain Name for Auction | October 14, 2007, 4:40 am |
| Mobile PC platform for a robot | July 20, 2006, 5:48 pm |
| Sending command to a robot from a mobile phone with Symbian OS | July 6, 2005, 8:27 am |
| [ANNOUNCE] MissionLab v7.0 released - Mobile Robot Software | July 12, 2006, 5:07 pm |
| Programming a Local GPS Navigation System into a Mobile Robot | May 25, 2008, 4:14 am |
| WiMo Robot - Windows Mobile 5 Cellphone as controller | August 4, 2008, 4:55 pm |
| Multi-channel video transmitter/receiver for mobile robot | June 3, 2008, 7:38 am |
| NEW AVR ARCHIVE: http://avr.x.am | May 16, 2006, 12:24 pm |
| http://technology-gadgets-review.blogspot.com | March 10, 2006, 2:04 pm |
| Robotics news site http://robots.simra.net | July 22, 2006, 5:08 pm |
|
|
Yahoo! 
Google 
Windows Live 
del.icio.us 
digg 
Netscape 
XML site map
> I'd like to show you my mobile robot based on the HandyBoard
> controller. Pls have a look athttp://robot.proof.cz
> Basic info:
> * 2 MHz microprocessor Motorola 68HC11.
> * 32 kB RAM, battery backed.
> * Drives up to 4 DC motors. I've changed the two L293D circuits
> with four SN754410NE so I can now control DC motors with up to 2A
> constant or 2.4A peak power consumption. (See H-bridges)
> * Two motor outputs can be used to control a stepper motor.
> * 16 x 2 LCD display.
> * Two fully programmable buttons, potentiometer with 0-255 range
> and a piezo buzzer.
> * 7 analog and 9 digital inputs. All of them powered for use with
> active sensors.
> * 9.6V NiCd battery pack. Charging is done by a special interface
> adapter or directly using the main board. Just connect a power adapter
> and that's it.
> * A 38kHz infra red receiver/transmitter. It's not connected at
> the moment, I'm working on a remote digital radio control.
> * 8 pin powered serial connector interface with up to 1 Mbaud
> transmission speed.
> * Easily expandable using the expansion board.