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The expansion kit for 3pi mobile robot is a printed circuit board allowing you to add very easily your own components to the 3pi mobile robot of Pololu. It has the exact same size as the robot and is mounted right above the wheels. The expansion kit is very easily removable.
The shape with cutouts of the expansion kit's PCB let you see the LCD screen and access easily to the power and reset buttons, as well as the ISP programming header. If you need more space for your prototype, you can choose the expansion kit for 3pi mobile robot of Pololu without cutouts. Both models exist in red (with, without cutouts).
The expansion kit for 3pi mobile robot contains a printed circuit board with with holes spaced on a 0.100" grid, one extended 2×7 male header, two extended 1×2 male headers, one 2×7 female header, two 1×2 female headers, four 7/8" nylon spacers, four 1-1/4" screws, and four nuts.
The expansion kit for 3pi mobile robot offers you a large free space for your componants. It has room for one 0.6" 40-pin DIP (dual in-line package) component, such as the ATmega32 or a lot of smaller DIP components. Prototyping space goes to the edge of the expansion kit's PCB, allowing you numerous interresting locations to mount all kind of sensors, from bumper switches to range-finders.
Once assembled, the expansion kit's PCB gives you access to the ATmega168’s free/jumpered pins, as well as to the three on-board voltages: VBAT (battery voltage), VCC (regulated 5V), and VBST (regulated 9.25V that is supplied to the motors). It is also connected to the 3pi mobile robot's power button and battery charge port, allowing you to add your own power buttons and charge ports.
The silkscreen of the expansion kit's PCB allows you to see how the pads are connected the electrical connections are on the bottom side. You can cut the copper traces with a sharp knife if they interfer with your prototype.
The two unused I/O lines on the 3pi mobile robot’s microcontroller are its serial transmit and receive lines. This means that you can add a second microcontroller or microcontroller board, such as a Basic Stamp, or Arduino Nano, to the expansion kit's PCB. This second microcontroller would deal with all of the sensors and additional hardware you added on the expansion kit's PCB and control the base via serial commands. Pololu releasedserial slave program for the 3pi mobile robot that turns it into a serially controlled platform that waits for the orders of your microcontroller
The supplied header pins allow you to establish all of the necessary electrical connections between the expansion kit's PCB and the 3pi mobile robot. We recommend that you fully assemble the 3pi mobile robot and its expansion kit in the following order before you solder anything. This will ensure that once everything is soldered in, the expansion platform will align properly with the base.
After assembly you will have a single 2×1 female header left over. You can use this to create your own battery charge port on the expansion kit's PCB.