will melt. Solder on a silicone heat-proof mat if
you have one (Figure
B
).
2. SOLDER COMPONENTS ONTO PCB
You’ll need a PCB design software to click around
and see which part goes where. First, download
the board and schematic files from github.com/
tomasero/openSleep/tree/master/hardware.
Then you can upload them to the free Altium
Online Viewer (altium.com/viewer) to see how the
components should be arranged. Or download
Eagle, which offers a free version for hobbyists
(autodesk.com/products/eagle/free-download).
This is the software we used to designed the
board and can also be used to visualize all the
components and traces (Figure
C
).This way you
can looking at the .brd and .sch files while you
solder all the components in place.
Now you can start soldering the components!
Use generous amount of flux when soldering
the MCU and check closely to avoid bridging. In
the timelapse video of Tomás working (youtu.be/
FMHOy8AFdqA) he’s using a stencil (and taking a
long time to align it!) and solder paste, but this is
not necessary. The board was redesigned so that
you can assemble it using only a soldering iron,
with no need for a reflow oven.
Once the board is all soldered up it should look
like Figure
D
.
3. CONNECT THE PROGRAMMING GEAR
Check that you have the J-Link, FTDI, and SWD
breakout boards.
Solder the included jumper pins onto the SWD
breakout board.
Plug the J-Link into the SWD breakout board,
then connect the J-Link to your computer by
USB. Also connect the FTDI connector to your
computer by USB (Figure
E
).
Connect the SWD and FTDI breakout boards to
the Tag-Connect cable as shown in the diagram
(Figure
F
). When powering the Dormio board
using a battery, connecting the VCC of the FTDI
breakout board isn’t necessary.
Use the pinout diagram in Figure
G
as
reference to match the pins of the Tag-Connect
cable (Figure
H
). Note that the connections you
attach should be mirrored from their layout on
the PCB viewer (Figure
I
).
E
F
G H
I
59
make.co
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