Difference between revisions of "Trim Controller"

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== General notes ==
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=Possible configurations=
  
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Idea for vendor to make the boards
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* Input pins: 24, 11, 23, 10
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https://www.pcbway.com/
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* Input pins with external pull up: 9, 22
  
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Trim system controller is based on this board:
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==Button combos==
  
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https://www.rugged-circuits.com/microcontroller-boards/ruggeduino-smalls-tcrmx
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===Single or dual elevator trim with neutral and trim wheel===
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* Pilot and co-pilot: UP pin 24
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* Pilot and co-pilot: Down pin 11
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* Pilot and co-pilot: Neutral pin 23
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* Trim wheel: pin 9 and 22
  
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Which has the same pinout of this board:
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===Single or dual elevator trim with neutral and trim wheel and speed sense===
 +
* Pilot and co-pilot: UP pin 24
 +
* Pilot and co-pilot: Down pin 11
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* Pilot and co-pilot: Neutral pin 23
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* Trim wheel: pin 9 and 22
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* Speed sensor: pin 10
  
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[[File:uno.jpg|500px]]
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===Single Elevator and Single rudder/aileron trim with neutral===
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* Pilot and co-pilot: UP pin 24
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* Pilot and co-pilot: Down pin 11
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* Pilot and co-pilot: Neutral pin 23
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* Pilot and co-pilot: Rudder or aileron up pin 9 (requires external pull up resistor)
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* Pilot and co-pilot: Rudder or aileron down pin 22 (requires external pull up resistor)
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* Pilot and co-pilot: Rudder or aileron neutral pin 10
  
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Power supply circuit:
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===Single Elevator with neutral and Single rudder/aileron with speed sense===
 +
* Pilot and co-pilot: UP pin 24
 +
* Pilot and co-pilot: Down pin 11
 +
* Pilot and co-pilot: Neutral pin 23
 +
* Pilot and co-pilot: Rudder or aileron up pin 9 (requires external pull up resistor)
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* Pilot and co-pilot: Rudder or aileron down pin 22 (requires external pull up resistor)
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* Speed sensor: pin 10
  
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:[[File:ClipCapIt-220222-144720.PNG]]
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===Fixed===
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* Master warning: pin 21
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We also need the following:
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* Master caution: pin 8
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* Autopilot input: pin 7 and 20
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* (1) DRV8871 Motor controller
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* Analog output for trim position: pin 6 and 19
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* (1) digital pot MCP4651 (not MCP[1|2]XX because those are SPI which needs more pins)
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* Trim A sense and power: pin 1, 14, 2, 15, and 16
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* Trim B sense and power: pin 3, 4, 5, 17, and 18
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Inputs are:
 
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ADC
 
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# ADC for linear resistor 1
 
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# ADC for linear resistor 2
 
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# ADC 4 for i2c
 
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# ADC 5 for i2c
 
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Digital
 
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# Encoder A
 
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# Encoder B
 
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# Trim up (both up/down goto neutral)
 
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# Trim down (both up/down goto neutral)
 
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# Trim up (both up/down goto neutral)
 
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# Trim down (both up/down goto neutral)
 
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# Motor IN 1
 
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# motor IN 2
 
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# motor driver A
 
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# motor driver B
 
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# transistor for sinking current to discrete input.
 
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== MCP4651 notes ==
 
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Tie A0, A1, A2 to get the default first i2c address. 
 
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This code can probably work with some changes. 
 
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https://github.com/uChip/MCP4551/tree/master
 
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Notice that the code sets the default address to 0x2E
 
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#define MCP4551_DEFAULT_ADDRESS 0x2E // A0 is connected to GND
 
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That won't work on the 2 pot 4651.  See this note in the datasheet:
 
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:[[File:ClipCapIt-231212-202111.PNG]]
 
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The default 4551 with A0 low is '0101 11`b + 0 where b is a 0 to make a byte so 0101110 or 0x2E.  With a 4651 with A0, A1, A2 all low, we should get 0101000 or 0x28.  As for writing to the second resistor array looks like the first 4 bits change.
 

Latest revision as of 20:12, 27 January 2024

Possible configurations

  • Input pins: 24, 11, 23, 10
  • Input pins with external pull up: 9, 22

Button combos

Single or dual elevator trim with neutral and trim wheel

  • Pilot and co-pilot: UP pin 24
  • Pilot and co-pilot: Down pin 11
  • Pilot and co-pilot: Neutral pin 23
  • Trim wheel: pin 9 and 22

Single or dual elevator trim with neutral and trim wheel and speed sense

  • Pilot and co-pilot: UP pin 24
  • Pilot and co-pilot: Down pin 11
  • Pilot and co-pilot: Neutral pin 23
  • Trim wheel: pin 9 and 22
  • Speed sensor: pin 10

Single Elevator and Single rudder/aileron trim with neutral

  • Pilot and co-pilot: UP pin 24
  • Pilot and co-pilot: Down pin 11
  • Pilot and co-pilot: Neutral pin 23
  • Pilot and co-pilot: Rudder or aileron up pin 9 (requires external pull up resistor)
  • Pilot and co-pilot: Rudder or aileron down pin 22 (requires external pull up resistor)
  • Pilot and co-pilot: Rudder or aileron neutral pin 10

Single Elevator with neutral and Single rudder/aileron with speed sense

  • Pilot and co-pilot: UP pin 24
  • Pilot and co-pilot: Down pin 11
  • Pilot and co-pilot: Neutral pin 23
  • Pilot and co-pilot: Rudder or aileron up pin 9 (requires external pull up resistor)
  • Pilot and co-pilot: Rudder or aileron down pin 22 (requires external pull up resistor)
  • Speed sensor: pin 10

Fixed

  • Master warning: pin 21
  • Master caution: pin 8
  • Autopilot input: pin 7 and 20
  • Analog output for trim position: pin 6 and 19
  • Trim A sense and power: pin 1, 14, 2, 15, and 16
  • Trim B sense and power: pin 3, 4, 5, 17, and 18
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