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Schematic

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Radiken:
I'm sorry to bug everyone with another schematic, but I had to scrap the first one and redesign...

This one uses the OOPic version of the PIC16F877 chip.
I decided to switch because I had the OOPic chip already, as with the eeprom needed too...

Just one question:
Do I really need I/O ports with regulated voltage? I can't really think of a sensor that couldn't just be plugged into the analog in...

Any thoughts are appreciated!
Thanks!

Ro-Bot-X:
Use regulated power supply for all sensors.

I have the OOPIC-R board. On this board they divided the I/O pins in groups of 5. Each group's power line goes to a jumper from which the user can select either 5v or unregulated. Why don't you do just that?

I use this board to control an arm with 6 servos, the pan and tilt head (2 servos), a PING ultrasonic sensor, an Eltec pyro sensor and an IR sensor for the gripper. I have grouped the devices like this: US sensor, Eltec sensor, IR sensor and the 2 servos for the head on the first group, powered with 5v. All the other servos (for the arm) are powered from the 6V battery (unregulated). So you see, you can have both ways with just a jumper.

Admin:

--- Quote ---Use regulated power supply for all sensors.
--- End quote ---
Its cause sensors give out different readings depending upon input voltage.

Radiken:
I think there was some confusion...
The I/O lines are strictly for servos, and any sensor that I need to plug in can go to one of the analog in ports...

Although,
Ro-Bot-X, your jumper statement sounds pretty useful, I think I'll go with that...

Admin:

--- Quote ---any sensor that I need to plug in can go to one of the analog in ports...
--- End quote ---
but all sensors need power and ground to work . . . the analog pin is for output, not powering the sensor ;D

since you need to regulate voltage to your microcontroller anyway, just use that voltage . . .

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