Parki Internals II: Electronics

Here we are, after several months of silence, I’m giving you out the schémathics of Parki.

You thought I was really going to give them to you?? Lol!!

I might consider it if you ask though… 😉

Let’s talk about more serious stuff. Parki’s core has 12 circuit boards which are :

  • The motherboard (1) : a Pic18f4680 as the core/brain of the robot and lots of connectors for the other circuit boards.
  • The Power Supply (2) : contains three high current capable voltage outputs : 5V for the logic, 6V for the servos and 19V for the motors.
  • 2 three channel input boards (3) : they work as an interface between the micro-controller and the Bumpers (Contact sensors).
  • 19V Power distributor board (4) : used to connect the output of the power supply and to distribute it to the motors.
  • three 5V Power distributor boards (5)  : one of them powers the motor boards, the others connected with a cable switch in between. When the cable is disconnected, the logic circuits are turned on and the robot starts moving.
  • Two Stepper Motor Boards (6) : uses a SN754410 as  motor driver. However, we burnt the IC and we didn’t have a replacement, so we changed to another IC the day of the contest.
  • Servos distributor (7) : interface the servos, the micro-controller and the power supply.
  • Line scanner (8) : an array of 14 IR sensors (QRD1114) scans the terrain to find lines under the robot. The purpose was to increase robot’s position accuracy. However we already had a very good one so we didn’t use this board in the end.

The following pictures illustrate Parkis electronic system.


And finally a schéma that specifies all the connections between the electronic boards.

PS : it’s in french and some small changes were made in the final version.



One comment on “Parki Internals II: Electronics

  1. Pingback: Parki Internals III : Design Hints and Informatics « Redkiing's Blog

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