4tronix Pi2Go Lite Instructions for use

Soldering Pi2Go Lite
First check which version of the main PCB you have. It is marked above the left motor
"Pi2Go-Lite v1.x". There are minor changes to some parts of the build.
• v1.0 (initial release) - Yellow
• v1.1 (from 20th October 2014) - Yell0w
• v1.2 and later (from 15th November 2014) - Orange
Soldering the Line-Follower PCB
1. Check you have the correct parts
• PCB
• 2 x 330R resistors (Orange, Orange, Brown)
• 2 x 220R resistors (Red, Red, Brown)
• Diode
• 2 x LEDs (Green & Red)
• 2 x IR reflectance sensors
• 6-pin male header

2. Solder the diode - black line away from the connector
3. Add the resistors.

4. Add the LEDs. Long leg next to the + sign on the silk screen (ie. long leg away from centre
of PCB)
5. Add the reflectance sensors to the bottom of the PCB. Blue LED at the edge of the board
as shown

6. Solder the male header to the top of the board. Ensure it is soldered perfectly vertical

Now to solder the main PCB
7. First ensure you have all the parts:
• Main PCB with motor driver, schmidt trigger and voltage regulator fitted
• 4 x 220R resistors (Red, Red, Brown)
• 2 x 330R resistors (Orange, Orange, Brown)
• 1 x 1K resistors (Brown, Black, Red)
• 2 x 2K2 resistors (Red, Red, Red)
• 2 x 10K resistors (Brown, Black, Orange)
• 2 x 56K resistors (Green, Blue, Orange)
• Diode 1N5817
• 2 x 470uF capacitors
• 6 x LEDs (Green, Red, 4 x White)
• 100uH coil
• Ultrasonic sensor
• 2 x IR reflectance sensors
• 2-pin mini tact switch
• Toggle switch
• 3x2 male header (2 of these for v1.1)
• 2 x 6-pin female headers
• 26-pin GPIO header
• 3 x 2-pin screw terminals
• 2 x 0.1" 2-pin jumpers (v1.1 only)
• 2 x 100nF capacitors - small yellow blobs with long legs! (v1.1 only)
• 1 x miniature slide switch (v1.2 only)

8. Add the resistors near the front of the board. The silk screen shows the value. It doesn't
matter which way they go but it is tidier to keep a standard orientation
** For v1.1 and later, also add the two 100nF capacitors at either end of the IC in photo
above
9. Add the resistors in the block near the motor driver chip. For tidiness, keep all the gold
bars at the same end
10. Add the 1N5817 diode. Ensure the silver stripe is towards the centre of PCB
11. Add LEDs at front of board. Red is for port (as in the wine), left. Green for starboard,
right. And 2 white LEDs.
Ensure that the long lead of each LED goes into the position marked with a + (on v1.0 the +
sign has missed the edge of the board and can only just be seen, v1.1 and later are OK)

12. Add the 2 white LEDs at the rear of the board, again ensuring long lead into the +
13. Add the 2-pin tact switch
14. Add the two 470uF capacitors ensuring long lead towards centre of board (grey strip on
case towards outside of board)
Keep the 100uH coil to one side as it is better to leave this until last as it is quite tall
Now open the bag of headers and switches:

15. Add the three headers:
• 6-pin female header for I2C breakout (bottom left of photo)
• 3x2 male header for servos (top left of photo)
• ** For v1.1 also add a 3x2 male header in the position at the bottom centre of above
photo
• 26-pin GPIO header
• For v1.0, note that the lower 3x2 header is not used unless the wheel encoder add-on
pack is fitted
• ** For v1.1 add the 2 blue jumpers in the leftmost positions for line followers, or
rightmost positions for wheel sensors
• ** For v1.2 we have replaced the 3x2 headers and 0.1" jumpers with a miniature slide
switch as shown below
The position of the jumpers (v1.0 and v1.1) should be as shown below. Put both jumpers to
the left for line following, and to the right for wheel sensing. Note that the jumpers should be
aligned along the length of the Pi2Go-Lite, not across the board.

16. Snip the 4 leads on each reflectance sensor at the position shown
17. Solder the sensors in the front corners. Ensure you solder the top and the bottom of the
board and that the blue LED is to the left as looking at the photo above
Note: If you are using the wheel sensors, now is a good time to head over to the build
instructions for wheel sensors

18. Add the three 2-pin terminals to the bottom of the board. Connector holes should face to
the rear of the board as shown above
19. Add the 6-pin female connector to the bottom of the PCB. Ensure that it is mounted
perfectly vertical as it is used to connect to the line follower board. Solder one pin, then
adjust the position with one hand whilst keeping the solder melted with the other. 3 hands
helps here!
20. Add the toggle switch to the underside of the PCB at the rear. This is the On/off switch