# 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)   |


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.macchina.cc/product-documentation/m2-docs/detailed-reference/byob.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.