Tuesday, January 6, 2009

PWM-Based Current Controller

A friend was looking for ways to control current flow in one of his projects. As always, MacGyver was approached to find a solution for him. So, MacGyver did just that. Pictured below is a PIC-based, PWM current controller that runs at 70kHz with 0-100% duty cycle varied via the multiturn trimpot. The MOSFET used is supposed to be able to handle about 50A with 0.022ohms on resistance. I don't think it can hit that high without exploding with the current heatsink.

Anyhow, the whole purpose of this board is to ascertain how much current does his project needs. From there, an alternative circuit will be made to cater just for that requirement... No need for fancy PIC, LED and all... That's for later... :-)

Monday, January 5, 2009

MyChicA Video...

During my initial search for a suitable robot to build, I could not find any Loki-based biped video on the internet... not on youtube and not on metacafe... so... for those seeking to see how a Loki-based biped moves, here the video I took of MyChicA doing forward and slight left turn...

For the moment, MyChicA is walking blind... next to be added will be the IR-based distance measurement system... later possibly a tactile switch under the feet to detect edges... who knows... we'll see how it goes...

video