> For the complete documentation index, see [llms.txt](https://docs.macchina.cc/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.macchina.cc/product-documentation/m2-docs/detailed-reference/byob.md).

# Breakout Board

The Macchina M2 was designed to be modular to give you the option of using your own microcontroller board in place of our Arduino-based processor board. We've built a [breakout board](https://www.macchina.cc/catalog) to make it easy to connect a Raspberry PI, Edison, Particle, or whatever your favorite microcontroller may be.

![](/files/-Lhg6DASTW1IG6P3VQNA)

We've broken out all of the necessary signals to make it easy to hook up. Below is a rendering of the top of the breakout board showing where each signal is found. See the tables below for further description of how pins work.

**At a bare minimum, connect +5VOUT and GND to your microcontroller board, supply the interface board with +3.3V at +3.3VIN, and connect up whatever signals you are looking to interface with (CAN, LIN, etc)**

![](/files/-Lhg6DAUGhxytUetcsAl)

| PCB Left column label | Interface board signal name | Function                                |
| --------------------- | --------------------------- | --------------------------------------- |
| A1                    | GPIO1 ANA                   | Analog input 1 (J5 pin 1)               |
| A2                    | GPIO2 ANA                   | Analog input 2 (J5 pin 5)               |
| A3                    | GPIO3 ANA                   | Analog input 3 (J5 pin 9)               |
| A4                    | GPIO4 ANA                   | Analog input 4 (J5 pin 13)              |
| A5                    | GPIO5 ANA                   | Analog input 5 (J5 pin 17)              |
| A6                    | GPIO6 ANA                   | Analog input 6 (J5 pin 21)              |
| GPIO1A                | GPIO1 A                     | 12V I/O channel 1    (J5 pin 2)         |
| GPIO2A                | GPIO2 A                     | 12V I/O channel 2    (J5 pin 6)         |
| GPIO3A                | GPIO3 A                     | 12V I/O channel 3    (J5 pin 10)        |
| GPIO4A                | GPIO4 A                     | 12V I/O channel 4    (J5 pin 14)        |
| GPIO5A                | GPIO5 A                     | 12V I/O channel 5    (J5 pin 18)        |
| GPIO6A                | GPIO6 A                     | 12V I/O channel 6    (J5 pin 22)        |
| GPIO1-6 B             | GPIO1-6 B                   | Not connected in Release M2             |
| ISENSE                | I SENSE 12V                 |                                         |
| OC                    | OVER CURRENT                |                                         |
| GPIOEN                | 12Vio\_EN                   |                                         |
| OCADJ                 | DAC1                        |                                         |
| +5VOUT                | +5V                         | +5V OUT (can supply up to \~3A)         |
| PS\_nDIS              | BUCK\_nDIS                  |                                         |
| +3.3VIN               | +3.3V                       | Need to suppply 3.3V to interface board |
| +12VOUT               | VIN                         | Vehicle battery voltage                 |
| GND                   | DGND                        | Ground                                  |

| PCB Right column label | Interface board signal name | Function                          |
| ---------------------- | --------------------------- | --------------------------------- |
| CAN0 TX                | CANTX0                      | CAN channel 0 TX                  |
| CAN0 RX                | CANRX0                      | CAN channel 0 RX                  |
| CAN1 TX                | CANTX1                      | CAN channel 1 TX                  |
| CAN1 RX                | CANRX1                      | CAN channel 1 RX                  |
| CAN0S                  | HSC\_S                      | CAN channel 0 Silent mode control |
| CAN1S                  | MSC\_S                      | CAN channel 1 Silent mode control |
| K-TX                   | 9141 K TX                   | K-Line or LIN channel 0 TX        |
| K-RX                   | 9141 K RX                   | K-Line or LIN channel 0 RX        |
| L-TX                   | 9141 L TX                   | L-Line or LIN channel 1 TX        |
| L-RX                   | 9141 L RX                   | L-Line or LIN channel 1 RX        |
| K-SLP                  | 9141 K SLP                  | K-Line/LIN0 sleep control input   |
| L-SLP                  | 9141 L SLP                  | L-Line/LIN1 sleep control input   |
| SWC M1                 | SWC M1                      |                                   |
| SWC M0                 | SWC M0                      |                                   |
| SWC INT                | SWC nINT                    |                                   |
| RST                    | M\_nRST                     |                                   |
| MISO                   | SPI0 MISO                   |                                   |
| MOSI                   | SPI0 MOSI                   |                                   |
| nCS3                   | SPI0\_nCS3                  |                                   |
| CLK                    | SPI0 CLK                    |                                   |
| 1850 P/nV              | J1850\_PWM\_nVPW            |                                   |
| LP                     | J1850 9141 ON               |                                   |
| 1850 PRX               | J1850\_PWM\_RX              |                                   |
| 1850 VRX               | J1850\_VPW\_RX              |                                   |
| 1850 +TX               | J1850+\_TX                  |                                   |
| 1850 -TX               | J1850-\_TX                  |                                   |
| GND                    | DGND                        | Ground                            |
| +5VOUT                 | +5V                         | +5V OUT (can supply up to \~3A)   |