Difference between revisions of "Trim Controller"
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| + | == General notes == | ||
| + | |||
Idea for vendor to make the boards | Idea for vendor to make the boards | ||
https://www.pcbway.com/ | https://www.pcbway.com/ | ||
| Line 39: | Line 41: | ||
# motor driver B | # motor driver B | ||
# transistor for sinking current to discrete input. | # transistor for sinking current to discrete input. | ||
| + | |||
| + | == MCP4651 notes == | ||
| + | |||
| + | Tie A0, A1, A2 to get the default first i2c address. | ||
| + | |||
| + | This code can probably work with some changes. | ||
| + | https://github.com/uChip/MCP4551/tree/master | ||
| + | |||
| + | Notice that the code sets the default address to 0x2E | ||
| + | #define MCP4551_DEFAULT_ADDRESS 0x2E // A0 is connected to GND | ||
| + | |||
| + | That won't work on the 2 pot 4651. See this note in the datasheet: | ||
| + | |||
| + | :[[File:ClipCapIt-231212-202111.PNG]] | ||
| + | |||
| + | 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. | ||
Revision as of 20:30, 12 December 2023
General notes
Idea for vendor to make the boards https://www.pcbway.com/
Trim system controller is based on this board:
https://www.rugged-circuits.com/microcontroller-boards/ruggeduino-smalls-tcrmx
Which has the same pinout of this board:
Power supply circuit:
We also need the following:
- (1) DRV8871 Motor controller
- (1) digital pot MCP4651 (not MCP[1|2]XX because those are SPI which needs more pins)
Inputs are:
ADC
- ADC for linear resistor 1
- ADC for linear resistor 2
- ADC 4 for i2c
- ADC 5 for i2c
Digital
- Encoder A
- Encoder B
- Trim up (both up/down goto neutral)
- Trim down (both up/down goto neutral)
- Trim up (both up/down goto neutral)
- Trim down (both up/down goto neutral)
- Motor IN 1
- motor IN 2
- motor driver A
- motor driver B
- transistor for sinking current to discrete input.
MCP4651 notes
Tie A0, A1, A2 to get the default first i2c address.
This code can probably work with some changes. https://github.com/uChip/MCP4551/tree/master
Notice that the code sets the default address to 0x2E
- define MCP4551_DEFAULT_ADDRESS 0x2E // A0 is connected to GND
That won't work on the 2 pot 4651. See this note in the datasheet:
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.
