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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
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v1.1 (from 20th October 2014) - Yell0w
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v1.2 and later (from 15th November 2014) - Orange
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Soldering the Line-Follower PCB
1. Check you have the correct parts
PCB
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2 x 330R resistors (Orange, Orange, Brown)
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2 x 220R resistors (Red, Red, Brown)
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Diode
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2 x LEDs (Green & Red)
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2 x IR reflectance sensors
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6-pin male header
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Related Manuals for 4tronix Pi2Go Lite
Summary of Contents for 4tronix Pi2Go Lite
- Page 1 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 •...
- Page 2 2. Solder the diode - black line away from the connector 3. Add the resistors.
- Page 3 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...
- Page 4 6. Solder the male header to the top of the board. Ensure it is soldered perfectly vertical...
- Page 5 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) •...
- Page 6 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.
- Page 7 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:...
- Page 8 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 •...
- Page 9 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...
- Page 10 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.
- Page 11 21. Solder the ultrasonic sensor board to the bottom of the board, facing forward. Ensure it is fully inserted and horizontal. NOTE: Sometimes we receive a batch of ultrasonic sensor modules where the header is on the same side as the sensors. Do NOT fit these. Contact us immediately for a replacement. If these are fitted, they will interfere with the mounting pillars and may cause a short-circuit.
- Page 12 Soldering the Motor Wires & Capacitors Notes - Please read: 1. It is very important to add at least one capacitor between the two terminals of each motor. This removes about 70% of the electrical noise produced by the motor. Another 20% can be removed by adding 2 capacitors, one from each terminal to the case.
- Page 13 Motor 2 - Add Main Capacitor Feed a capacitor through the metal terminals and solder as shown. It doesn't matter which way round it is fitted. Then clip the leads short - being careful not to clip off the motor terminals Motor 3 - Add Second &...
- Page 14 If required, the other 2 capacitors should be soldered between one motor terminal and the metal case, as shown above. You will need a hot iron to heat up the case sufficiently to melt the solder. Then clip the leads short:...
- Page 15 Motor 4 - Add the Wires 1. Each wire has a short end and a long end. The short end should be soldered to the motor 2. Solder the Red wire to the top terminal and the Black wire to the bottom terminal, as shown above.
- Page 16 Assemble the Pi2Go-Lite You could watch the one minute assembly video here but note that some things are slightly different from this released version For each Raspberry Pi mounting position you will need a 20mm M2.5 pillar, an 8mm countersunk screw and a 3mm spacer. For the Model B you will require 2 sets, and for the Model B+ you will require 4 sets Here we have mounted 2 pillars in the correct positions for a Model B.
- Page 17 Prepare the line follower PCB, the 4 M3x6mm screws, the 2 M3 25mm pillars, the ball caster and the 6-pin female header Screw the 25mm pillars into the main PCB using 2 of the 6mm M3 screws Push the female header onto the male header on the line follower board, then push the completed assembly into the female header on the underside of the main PCB.
- Page 18 Use the 6mm M3 screws to screw through the ball caster, through the line follower PCB and into the pillars Prepare the items required to mount the motors: 2 motors with wires and capacitors ready soldered • 4 motor mount PCBs •...
- Page 19 Push the motor mount PCBs from the top of the main board so that the holes line up with the mounting holes in the motor. Pass the 25mm screws from the outside, through one mount, through the motor and then through the second mount. Screw into the M3 nuts on the inside. Repeat for both motors.
- Page 20 Push the wheels on now as it makes the unit more stable. Your Pi2Go-Lite should look like this To mount a Model B you will need an extended GPIO header and 2 x 5mm male-female pillars. To mount a Model B+ you will need also need 2 x 4mm countersunk screws. For the B+ use the screws for two front mounts and the 5mm male-female pillars for the two rear mounts.
- Page 21 Push the extended header into the GPIO header on the main PCB, then carefully push the Raspberry Pi onto the extended header. Ensure that the mounting holes in the Pi match the pillars. If not, check that the GPIO header is plugged into the correct position. Push the extended header into the GPIO header on the main PCB, then carefully push the Raspberry Pi onto the extended header.
- Page 22 Below: Model B+ or RPi 2B Battery Holder Mounting Now use 2 4mm countersunk screws to fit the battery holder into position, screwing into the 5mm male-female pillars that hold the Pi. For the Model B, the battery holder is mounted as shown above.
- Page 23 Your Pi2Go-Lite is now Complete!