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WORK IN PROGRESS
PureControl V3– Assembly manual
v1.22 – 11.04.2019
PCB-Version: v1.55 (15.04.2018)
http://www.puremoco.com
https://www.facebook.com/puremoco
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Content 1. General information ........................................................................................................................ 3
1.1. Safety advise ............................................................................................................................ 3
1.2. Assembly tips ........................................................................................................................... 3
1.3. Necessary equipment .............................................................................................................. 3
2. Assembly.......................................................................................................................................... 4
2.1. PCB-assembly .......................................................................................................................... 4
2.1.1. Soldering SMD-resistors .................................................................................................. 4
2.1.2. 3.3V-Voltage-Regulator (LM3940) ................................................................................... 6
2.1.3. 3.3V regulator (LM3480) and BC847C transistor ............................................................ 7
2.1.4. Optocoupler..................................................................................................................... 8
2.1.5. Teensy supply diodes ...................................................................................................... 9
1.1.1. 150 Ohm resistor ........................................................................................................... 10
1.1.2. Connectors and power switch ....................................................................................... 10
1.1.3. PROG and RESET pushbutton ........................................................................................ 11
1.1.4. MOSFET (IRF 4905) ........................................................................................................ 11
1.1.5. Capacitors ...................................................................................................................... 12
1.1.6. Teensy-Pins .................................................................................................................... 16
1.1.7. Teensy jumper wires ..................................................................................................... 19
1.1.8. Stepper driver headers .................................................................................................. 22
1.1.9. SilentStepStick ............................................................................................................... 27
1.1.10. Voltage regulators ......................................................................................................... 29
1.1.11. USB-Host-Shield (optional) ............................................................................................ 34
1.1.12. AUX connection (optional) ............................................................................................ 35
1.2. Housing assembly .................................................................................................................. 39
1.2.1. Driver heatsink .................................................................................................................. 39
1.2.2. miniXLR socket wire connections ...................................................................................... 41
1.2.3. Adjustment of stepper current .......................................................................................... 49
1.3. Cable assembly ...................................................................................................................... 50
1.3.1. Power supply cable ........................................................................................................ 50
1.3.2. Stepper cable ................................................................................................................. 50
1.3.3. Camera power cable ...................................................................................................... 51
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1. General information
1.1. Safety advise
1.2. Assembly tips
- The pins of many components can be bend easily. Before placing the components on the
PCB, always make sure that the pins are straight and can be fitted without using force into
the PCB.
- It is very difficult (impossible) to remove components which are already soldered onto the
PCB. Make sure to align the components as good as possible before soldering all
connections. One good way to do this is to start only with one solder connection. Check
whether the part is fitted correctly. If not, you can heat up this connection and correct the
placement. Once the position is ok, you can continue with the remaining connections.
- The PCB does not have a false polarity protection. So please double check the polarity of all
components and cable of the power supply before connecting it to the power supply.
1.3. Necessary equipment
- Soldering iron or station with standard tip
- precision cutting pliers with flat cutting edge
- some isolation tape
- multimeter
- Fine screwdriver – slotted 1,0/1,5mm width
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2. Assembly
2.1. PCB-assembly
Amount Part Function
2 SMD resistor 150 Ω (Code: 151) Optocoupler resistor
3 SMD resistor 1,20 kΩ 0,1% (Code: 1201) Voltage Reading
2 SMD resistor 10 kΩ 0,1% (Code: 1002) Voltage Reading
1 SMD resistor 3 kΩ 0,1% (Code: 3001) Voltage Reading
2 SMD resistor 10 kΩ (Code: 103)
1 SMD resistor 1 kΩ (Code: 102)
1 SMD resistor 100 Ω (Code: 101)
1 SMD resistor 100 kΩ (Code: 104)
- Resistor values are labeled on PCB
- At first, apply some soldering tin on only one pad of each resistor value on PCB
- Using a tweezer, pick up the resistor, place it to the pad with the soldering tin and solder it
together
- Apply soldering tin to the opposite side
2.1.1. Soldering SMD-resistors
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2.1.2. 3.3V-Voltage-Regulator (LM3940)
This is the main voltage regulator which converts the 5V voltage to 3.3V. This will supply the stepper
drivers with the VIO voltage and the HM-10 Bluetooth module.
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• The 3.3V regulator is used for the power supply of the external Trigger (Slave-Mode).
• This transistor is used to switch the MOSFET which will switch the 12V power supply for the
stepper drivers.
ATTENTION:
Both components have the same housing and look the same. If you have a closer look, you can read
“L0A” on the LM3480 and “1GW 76” on the BC847C.
2.1.3. 3.3V regulator (LM3480) and BC847C transistor
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• This Optocoupler is used to trigger your camera. There are two optocouplers in one housing,
one for focus and one for the actual shutter.
• While placing the optocoupler, pay attention on the direction. There is a line marking on the
PCB. The optocouplers will have a flat area on one side. If you place the optocoupler in the
wrong direction, it won’t work.
2.1.4. Optocoupler (LTV826)
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• There are two identical diodes on the PCB
• This diode is used to prevent current running from the Teensy to the rest of the PCB when
connected via USB to a PC.
• While placing the diode, pay attention on the direction. One side of the diode has a white
mark, this is also marked on the PCB. If you place the diode in the wrong direction, the
Teensy won’t work.
2.1.5. Teensy supply diodes
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1.1.1. 150 Ohm resistor
• 150 Ohm resistor:
1.1.2. Connectors and power switch
• The power switch is used to choose, if you want to use both power supplies together or
separately (camera power supply)
• Place all components from the top side
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Place and solder the pushbuttons for PROG and RESET on the top side of the PCB. Make sure that the
short pushbutton (PROG) is on the left site.
This MOSFET will switch the 12V power supply for the stepper drivers. If it is not switch, the 12V rail
for the drivers is connected via a 150 Ohm resistor to the power supply. This is necessary to reduce
the power on current. Otherwise all capacitors would be fully loaded on power on, might causing the
power supply to switch off due to over current.
ATTENTION:
The MOSFET can be placed both ways into the three holes. Make sure to place it according the
picture below, otherwise you might cause damage on the control board.
1.1.3. PROG and RESET pushbutton
1.1.4. MOSFET (IRF 4905)
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Amount Part Function
6 Elko - 220µF - 35Volt Stepper driver
4 Elko - 150µF - 10Volt PCB logic
1 Elko - 680µF - 16Volt Camera Output
• Pay attention on the polarity of the capacitor, a wrong connected capacitor can explode and will
cause other damage. Each positive pole on the PCB is labeled with a “+”-symbol.
• There are two way to determine the polarity of the capacitor:
o One of the connecting pins is longer than the other, this one is the positive pole
o One side of the capacitor is marked white and containing a “-“ symbol, this is the
negative side
1.1.5. Capacitors
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4x 150 µF – 10 V
• Two of the 150µF capacitors need to be tilted flat to the PCB. Please do this before you start
soldering:
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6x 220 µF – 35 V
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1x 680 µF – 16 V
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• Cut this connection on the Teensy
1.1.6. Teensy-Pins
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• You will receive complete pin and socket headers, which must be cut to the according length
to fit the Teensy. Keep the pieces which you don’t need, you will need them later.
• Place the pin headers inside the socket header and put them on the PCB
• Place the Teensy on top of it and solder all connections on the top
• Make sure, that you place the Teensy in the right orientation and not upside-down
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• After you have finished the top-side, turn the PCB around and solder from the bottom.
• Start with all 4 corners, if the alignment is not good, you are still able then to correct it.
• If the alignment is correct, solder all remaining connections.
• Make sure that the socket is sitting completely on the surface and not like in the picture
below:
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1.1.7. Teensy jumper wires
• Some of the connections to the Teensy have to be done using jumper wires.
• Use one of the solo wires (ca. 5cm) and connect it from the bottom side to the “VUSB”-Pin of
the Teensy
• Connect to other end to “VUSB”-Pin on the PCB. When installing the wire, place it from the
top side (left picture below) and solder it from the bottom side (right picture below).
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• The next wires are for the RESET and PROGRAMMING connection of the Teensy. Take around
10cm wire for each connection and solder the wires from the bottom side to the “R” and “P”
pin of the Teensy.
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• Put both wires through the hole underneath the Teensy. Make sure that you know exactly
which wire is “R” and which “P”
• Turn around the PCB and solder the “R” wire to the marked “RESET” pin and the “P” wire to
the marked “PROG” pin (those pins are from the both pushbuttons)
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Prepare the female headers:
• 4 pieces: 8 pins → 1 free → 8 pins → 1 free→ 8 pin
• 1 piece: 6 pins
Place the outer row first (on the top side) and solder it. Make sure to it aligned properly before
soldering.
1.1.8. Stepper driver headers
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Now you must remove the solder pins, to be able to install the stepper sockets.
• Use a very flat pliers to cut them off. Make sure, that you don’t scratch the PCB around those
pins.
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• Place the 4-pin sockets from the bottom side
Start by soldering the outer pins. Check if the socket is aligned properly and then continue with the
rest.
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Make sure that you apply enough solder. It should look like this:
• After you have soldered the sockets, you can place the second row on the top side:
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• Place the female header for the Bluetooth-module:
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Now you are able to solder the SilentStepStick-drivers. Make sure that you have the right orientation.
This is labeled with “TOP”:
Do not solder the drivers this way, otherwise you will damage the drivers and the whole board:
1.1.9. SilentStepStick
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• Once you placed the SilentStepStick you can solder the pins on top.
ATTENTION:
The drivers can be placed both ways into the female header. Ensure that the side which has “M1B”,
“M1A”,”M2A” and “M2B” is always facing to the outer site. Placing the SilentSteckStick in the wrong
direction will damage the driver and the whole controller.
Also make sure that there is always one free pin between the drivers. If you place them the wrong
way, they will be damaged and might damage to whole PCB.
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1.1.10. Voltage regulators
The PCB must be equipped with two DC-DC voltage converters:
One voltage converter (bottom side) needs to be set to 5.0V and will supply the Arduino and the
SilentStepStick with power.
The second converter is placed on the top side and is used for camera power supply. This voltage
needs to be set to the according value, which you will find one your camera battery. Usually this will
be something around 7-8V. Some cameras will need higher values than printed on the battery. Be
careful to set this voltage to the right value. A higher voltage might destroy your camera.
Soldering the voltage converter requires a specific order, otherwise you will not be able to solder
other components or might damage the components due to high voltage.
The voltage converter will be delivered with a random current setting, so you need to set up the right
value before soldering the converter to the PCB:
Connect your supply voltage to the INPUT. Make sure you have the right polarity
Now measure the OUTPUT voltage. Adjust both regulators to 5.00V by turning the screw on the
potentiometer.
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• Cut out 8 single pins:
• Place 4 single pins into the Voltage-Converter-position:
• Make sure, that the long side of the pin is upwards:
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• Place the converter, but do not solder it yet.
• Turn over the board and solder the connections on the bottom side:
Repeat the same steps for the second converter. Do not solder the converter yet, just the pins on
the PCB. Otherwise you will not be able to continue the assembly…
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• Take the cables and solder them from the bottom side. Make sure that the position is similar
to the picture:
• Cut off the wire end on the top side, if they are too long. It should be a flat surface after.
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• After you have soldered the wires and all other components, you can solder the voltage
converters to the pins. Make sure the orientation is right.
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1.1.11. USB-Host-Shield (optional)
• This USB-Host-Shield is used to attach the Bluetooth-Dongle for the PlayStation4 Controller
support
• Before starting assembly, you need to cut the wire trace left to the “2K2” marking on the top
side of the module:
• Take a jumper wire (ca. 3-4cm) and solder it to the VBUS (from the bottom site) and connect
this wire to the “top right” pin of the shield like in the pictures below:
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1.1.12. AUX connection (optional)
Place the 15-pin Sub-D port from the bottom of the PCB, like in the picture below:
This connector is only required, if you are planning to connect further equipment like external
stepper drivers, sensors etc.
Unfortunately, all Pins of the Teensy are in use, so the only possibility to make more connections is to
use the solder pads on the bottom side of the Teensy.
The used pin-layout is just a recommendation. If your project requires other pins or functions, you
have to adjust the pins accordingly.
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The 15 Sub-D connector on the PCB already has some fixed connections as you can see in the pin-
layout below. So Pins 1,2,3,8,9 and 10 are already connected.
Pins 4,5,6,7,11,12,13,14 and 15 have no connection.
So we will use those unconnected pins and make some wire connections to the bottom side of the
Teensy. To make the connection, I recommend using ribbon cable. You will need one cable with 4
wires(pins 4,5,6,7) and one cable with 5 wires (pins 11,12,13,14,15). Both cables should be around
15cm and cut to length later.
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Start with making the wire connections from the top side of the PCB:
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This is the standard layout like shown on the previous page. You can adjust those pins to your needs,
but it is recommend using this layout
15-pin Sub-D Teensy 3.6
Pin 4 47
Pin 5 48
Pin 6 49
Pin 7 50
Pin 11 A11
Pin 12 54
Pin 13 55
Pin 14 56
Pin 15 57
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1.2. Housing assembly
1.2.1. Driver heatsink
• After soldering and placing of all SilentStepStick drivers, cut and put the thermal pad to each
headsink. Remove the protection film from the thermal pad and place it carefully like in the
picture below.
Now place the aluminium cube. Make sure the both surfaces with the rough surface are facing left
and right according to this picture.
ATTENTION:
Make sure that the heatsink is centered and not touching the pins on the left or right side. Otherwise
a contact will produce a short circuit and might damage the driver and the whole PCB.
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• Place adhesive tape on the cube and remove the protection film:
• Place the blue thermal pad on top.
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1.2.2. miniXLR socket wire connections
• Remove the nut of all three sockets (1x 3-pin and 2x 5-pin) and place it on each pair of cables
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• Place the shrinking tube on each wire (about 2-3cm long each)
• Place the cables through the holes. Make sure that you place the right cables to the right
hole. Pay attention to the label on the PCB and the housing plate.
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• Cut of the wires, so that about 2-3 cm are looking out:
• Remove the isolation about 3-4mm at the end and apply solder:
• Also apply some solder on the pins of the plug:
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• Solder the wires with the plug and apply the shrinking tube by using a lighter or hot air gun:
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• Connect both outer pins and solder the wire in the center of both pins, so that both pins are
connected. You can place the wire a bit to the outer side, to avoid any short between the
pins.
• Make sure, that you don’t touch the pin in the center or any other metal part. Leave the
center pin not connected and make sure, that you don’t have any contact to your soldering.
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• Place on the nuts and tighten them:
• Make sure, that the position is like this:
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• Place all 4 walls around the PCB
• Place the Bottom plate together with the rest. Make sure you have the right orientation. It
will only fit in one direction:
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• Place and tighten the 4 standard screws on the PCB. Make sure that you place the plastic
washers between the screws and the PCB. Do not overtighten the screws, since you are
screwing into plastic.
• Before you put in the screws, make sure that the cables below the PCB are free and not
between the PCB and the bottom housing. The PCB should be flat on the pillars of the
bottom housing part.
There is always one pin free between the drivers.
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1.2.3. Adjustment of stepper current
The output current of the stepper drivers needs to be reduced to 0.8A, since the drivers will get too
hot otherwise. The setting it done by a small setscrew on the drivers. The current can be later
reduced further inside the Android app, but this hardware setting is necessery to set a total limit.
1. Connect at least one stepper to the controller
2. Connect the power supply to PWR1
3. Open the app and open manual move
4. The stepper should have now power and you will be able to move it in manual mode.
5. If this is not the case, please shut off the power, close the app and retry again.
6. Now measure the voltage between the two points like in the picture below (IN- of the upper
voltage regulator (GND) and the Vref of the driver)
7. You should have around 1.13V (which is about 0.8A stepper current). You can adjust this by
turning the little potentiometer of the driver next to the VM pin.
8. Set the current on all drivers.
Setscrew to
adjust current
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1.3. Cable assembly
1.3.1. Power supply cable
1.3.2. Stepper cable
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1.3.3. Camera power cable
