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Nick: akeeh  Info
Age: 30
Location: Tampere

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Title: Robot
Created: 10.10.2006 15:03
Robot project
Robot got updated. Now it has a aluminum body instead of plywood, new motors (360 degree hacked standard servos and also the circuit boards are stripped off to allow direct control with a H-bridge), new tires and a wireless webcam (unfortunately not my own, just for testing).

The "brain" is the same old ATmega8 -board as it was in the old robot, also the bump and IR proximity sensors are the same. I attached a wireless keyboard+mouse receiver to control the robot with a keyboard (the operating range with this set is quite small, but it is still quite funny to control it with a keyboard). Don't mind about the big pile of wrapped wire coming from the receiver, because it is for testing purposes at the moment (I'm looking for another set of wireless keyboard+receiver so I can modify the receiver to have a better antenna and a shorter cable between the receiver and microcontroller).

At the moment it has two 9V batteries (one for the camera and the other is for the 5V regulator for the electronics) and four rechargeable AA cells for the motors.

EDIT: And it can wander around autonomously and avoid obstacles (well, atleast most of them)
Robot got updated. N...
Robot got updated. Now it has a aluminum body instead of plywood, new motors (360 degree hacked standard servos and also the circuit boards are stripped off to allow direct control with a H-bridge), new tires and a wireless webcam (unfortunately not my own, just for testing).

The "brain" is the same old ATmega8 -board as it was in the old robot, also the bump and IR proximity sensors are the same. I attached a wireless keyboard+mouse receiver to control the robot with a keyboard (the operating range with this set is quite small, but it is still quite funny to control it with a keyboard). Don't mind about the big pile of wrapped wire coming from the receiver, because it is for testing purposes at the moment (I'm looking for another set of wireless keyboard+receiver so I can modify the receiver to have a better antenna and a shorter cable between the receiver and microcontroller).

At the moment it has two 9V batteries (one for the camera and the other is for the 5V regulator for the electronics) and four rechargeable AA cells for the motors.

EDIT: And it can wander around autonomously and avoid obstacles (well, atleast most of them)
Robot got updated. N...
Back view of the robot project. Here you can see the 4xAA cells with the battery holder and the follower wheel. The small follower wheel is cut and bent from a piece of plastic and then I attached it to a small bearing (same kind as used in normal computer fans). Thanks to the bearing the wheel follows and turns very easily and doesn't affect driving and turning at all.
Back view of the rob...
My robot project. So far it only has two separate collision detectors but I'm working on IR proximity sensors to avoid collisions. That unconnected 6-wire cord in the ATmega board is the programming cable that I forgot to take away. :)
* Body: plywood (I'll make a new body as soon as I find a better material, but for now the plywood is good enough for this kind of prototyping), diameter of the plywood disc is 12cm and the overall height of the robot is about 10cm
* Brain: Atmel ATmega8 AVR microcontroller (32 pin TQFP one with a self made pcb) with a 4MHz crystal
* Programming language: C
* Motor controller: SN754410 (1 Amp Quadruple H-Bridge), you can see the corner of the control board on the front, below the top part
* Motors: two small (2cm long, 2cm diameter) gear motors I got from a friend, no idea where they have been used before but the robot runs nicely with the Lego wheels attached straight to the motors (about 12cm per second so no new land speed records yet)
* Power: 4xAA cells for the motors and 9V battery for other electronics
My robot project. So...