Lemon Rx Microbrick Reference Manual Download Page 19

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. 

Summary of Contents for Microbrick

Page 1: ...Binding 11 Programming 11 Transmitter or Microbrick 11 Programming the Microbrick 12 Swapping the Functions of the Onboard Servos 12 Changing Stabilization Response Direction 12 Selecting a Receiver M...

Page 2: ...er onboard servo Channel 5 On Off control of stabilizer internal to the receiver Channel 6 Aux1 or Left Aileron in dual servo aileron setups Channel 8 Master gain control of stabilizer sensitivity int...

Page 3: ...eplacement for the popular Spektrum AR6400 style integrated micro receiver with two onboard linear servos found in many UMX size micro models from E Flite and others It is also attractive to scratch b...

Page 4: ...lses to the ESC The ESC then knows that the signal is lost and the motor should stop with slight delay Not all small ESCs will do this and you should test to be sure For the small models for which thi...

Page 5: ...2 or later Spektrum transmitter 3 results in correct control directions for Throttle Channel 5 Mode switch and Channel 8 Master Gain knob That is throttle stick up increases speed switch A forward tur...

Page 6: ...t sometimes it needs to be 3 4m from the transmitter Nearby metal objects such as a furnace fence or vehicle can also prevent binding as can a Wi Fi router or nearby active RC transmitters After the r...

Page 7: ...repeatedly Also make sure the bind button is accessible 6 Set up servos Power on If stabilization is enabled use the channel 5 switch to turn the stabilizer OFF both green and red LEDs ON 1 If you hav...

Page 8: ...R rudder Instructions for changing the response direction are given on page 12 THIS IS VITALLY IMPORTANT If stabilization moves the surfaces the wrong way i e to increase the disturbance your model ma...

Page 9: ...stop after a couple of seconds and the control surfaces should stay in their current positions If you have Master Gain on channel 8 set it to the middle of its range 11 Perform a test flight If stabil...

Page 10: ...ific Issues Rudder Steering For a model steered by rudder that does not have ailerons the above instructions still apply but there are two options 1 Set it up just like an aileron model as above but i...

Page 11: ...follow or understand as lot of it is time dependent It is easiest to understand the green red and blue LEDS if we consider it by intended function Binding Start with the transmitter off or in System...

Page 12: ...en the onboard servos you can do this on the Microbrick Essentially this action shifts the rudder servo to channel 3 and the elevator servo to channel 4 Nothing else changes 1 With the transmitter off...

Page 13: ...manent until they are deliberately changed LED A E R Mixer function None Normal wing and tail V Tail Surfaces connect to onboard servos operated by channels 3 and 4 Elevon Delta Surfaces connect to on...

Page 14: ...ould be used for ailerons and Normal must be set as the wing type in Spektrum transmitters 2 If dual aileron is set then the Microbrick actively stabilizes on both channels 2 and 6 Dual Ail or Flapero...

Page 15: ...are involved but here the mixing is done in the transmitter Let s take a look specifically at how these three types of control setup are dealt with in relation to the Lemon Microbrick The actual setti...

Page 16: ...ponse for an axis use the push button switch and blue LEDs as previously indicated Master Gain Master Gain multiplies the three individual gain values set by the three gain pots by a constant factor I...

Page 17: ...100 to 100 when the switch moves from one side to the other If not you may have to adjust servo travel on channel 5 The stabilizer is ON between 100 and 0 and OFF between 0 and 100 If you have assign...

Page 18: ...eople seeking minimum weight can remove the header pins and solder directly to the PC board pads Hint Cut the plastic header spacer between each pin and remove them one at a time LM0070M2 This one is...

Page 19: ...y 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 ther...

Page 20: ...will see a maximum of 4 2v External 1 7 1 9g servos of the 5320 5330 type and linear servos intended for 1s AR6400 type bricks work fine 2 Supply is from an external brushless speed controller Typica...

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