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Lemon Microbrick Reference Guide
Page 19 of 20
BUT: It has one disadvantage. You need to have access to the button while binding. Normally this is not a big
problem as if you use stabilization you need access to the 3 gain pots and the bind button is right next door.
However, if the Microbrick is buried in the plane it can be a real problem.
SOLUTION
Add an external Bind Button or 0.1” header pins for a regular Bind Plug. If you find it
awkward to hold the tiny bind button while plugging in the battery at the same time,
then header pins and the regular bind plug may be more convenient.
All you have to do is solder two fine wires to these two pads on the Microbrick.
Put a small momentary switch or a 0.1” pin header (for connecting a Bind Plug) on the
other end. Either will be in parallel with the onboard switch and will initiate binding.
Put the switch or header somewhere convenient on the model. A long shaft PCB board
switch as shown is particularly convenient as you can feed it through a hole in the
fuselage and hot glue (or similar) the switch in place.
Mounting the Microbrick with double sided tape.
Lemon specifically warns against any form of mounting that stresses the
underside of the PC board.
Wh
at’s the problem
? The RF daughterboard that is actually the receiver is
mounted to the bottom of the main PC board by only four solder pads. This
is perfectly adequate for a unit that is protected in a case, but to save
weight the Microbrick is not so protected. If you mount the Microbrick using double sided tape, there is a very
good chance that you will rip the daughterboard off if you try and remove
it from the model. Lemon intends you to mount the Microbrick on rails
using the two screw holes provided but that may not be convenient; you
may want to use the traditional double-sided tape common in micro
planes.
Here is what to do.
Run some hot glue from a narrow tip glue gun around the board as shown
in the picture.
It is easiest to use one of the small hot glue guns with a fine tip sold for craft use. If you hit the hot glue with a
heat gun after it is in place it will melt again and run in between the two boards and make a strong joint.
This will add very little to the total weight but will solidly anchor the daughterboard on 3½ sides to the main PC
board. You can then use double sided tape as usual. You might want to use two or more layers in parts to “level”
that attachment surface. If you are absolutely sure you will never need to resolder to the five connection pads,
you can hot glue all four sides.
Power Supply Voltage and the Onboard Speed Controller
The Microbrick is 1-2s capable. That means you can power it from a 1s LiPo, a 5v or 6v BEC in an external
brushless speed controller, or direct from a 2s LiPo. All onboard components including the two servos and the
brushed speed controller are good up to 2s (8.5v) supply.