3pi Expansion Kit without Cutouts - Red

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  • Part No :
  • ROB-1341
  • Availability:
  • In Stock
  • Shipping :
  • Same Day*
  • Weight:
  • 0.1Kg
  • Made By:
  • Pololu - USA
  • Mfr.Part.No:
  • 976
  • Quality Rank:
  • 100/100
Rs 1544
(Excluding GST.)
Rs 1822
(Including GST)
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Description: This kit gives you everything you need to add a second level to your 3pi robot. In this version, the LCD pins are brought up to the expansion board from the base via extended headers for your own custom use. This red printed circuit board can also serve as a general-purpose round prototyping board.

The expansion PCB matches the diameter of the 3pi chassis and mounts just above the tops of the wheels using the four included screws and spacers. Once assembled, the PCB has electrical connections to the base that allow you interface your own electronics with the 3pi robot, which is sold separately. These connections give you access to the ATmega168’s LCD pins, ISP programming pins, and free/jumpered pins, as well as to the three on-board voltages: VBAT (battery voltage), VCC (regulated 5 V), and VBST (regulated 9.25 V that is supplied to the motors). Additionally, the expansion PCB connects to the base’s power button and battery charge port, allowing you to add your own power buttons and charge ports.

This version of the kit might be preferable over the version with cutouts to those who want additional I/O lines or extra prototyping space and do not need the LCD. A wireless module, for instance, might need the I/O and make the on-board LCD unnecessary if data is relayed to a nearby PC. For a more advanced expansion kit, please consider the m3pi expansion kit, which lets you turn your 3pi robot into an m3pi robot.

The expansion PCB is designed to provide plenty of prototyping space for your components. It has room for two 0.6" 40-pin DIP (dual in-line package) components, such as the ATmega32 in the picture below, or for numerous smaller DIP components. The prototyping space extends all the way to the edge of the PCB, allowing you convenient points to mount a variety of sensors such as bumper switches and range-finders. The silkscreen shows how the pads are connected; the electrical connections are on the bottom side. You can cut the copper traces on that bottom side (with a sharp knife or a small rotary tool cutoff wheel) if some of the pre-made connections interfere with your desired layout.

Two of the unused I/O lines on the 3pi’s microcontroller are its serial transmit and receive lines. This means that you can add a second microcontroller or microcontroller board, such as a Baby Orangutan, Basic Stamp, or Arduino Nano, to the expansion PCB. This second microcontroller would deal with all of the sensors and additional hardware on the expansion PCB and control the base via serial commands. We have released a serial slave program for the 3pi base that turns it into a serially controlled platform that can be driven at the whim of another microcontroller.

Kit Includes:
  • 1x Round PCB (holes spaced on a 0.100" grid)
  • 2x Extended 2×7 male headers
  • 2x Extended 1×2 male headers
  • 1x 2×7 female header
  • 2x 1×2 female headers
  • 4x 7/8" nylon spacers
  • 4x 1-1/4" screws
  • 4x Nuts.
Resources: NOTE: This expansion kit will cover up the 3pi’s LCD. If you want to preserve the LCD, please consider the version of the expansion kit with cutouts or the more advanced m3pi expansion kit. This product is a kit designed to augment the 3pi robot (sold separately). Assembly of this kit requires soldering.
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Good Spare

By Amal from Sikkim, India on June 28, 2016
If you have a 3pi rover, this accessory is worth buying.
2 of 2 people found this review helpful
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3pi Expansion Kit without Cutouts - Red