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https://github.com/araobp/can-bus

CAN adapter to UART
https://github.com/araobp/can-bus
can-bus mcp2515 mcp2561 mqtt pic
Last synced: about 1 month ago
JSON representation
CAN adapter to UART
Host: GitHub
URL: https://github.com/araobp/can-bus
Owner: araobp
License: gpl-3.0
Created: 2018-03-10T04:38:36.000Z (almost 7 years ago)
Default Branch: master
Last Pushed: 2021-11-10T16:15:11.000Z (about 3 years ago)
Last Synced: 2023-03-23T01:45:49.784Z (almost 2 years ago)
Topics: can-bus, mcp2515, mcp2561, mqtt, pic
Language: G-code
Homepage:
Size: 10.4 MB
Stars: 12
Watchers: 2
Forks: 0
Open Issues: 0
Metadata Files:
- Readme: README.md
- License: LICENSE
Awesome Lists containing this project

README

        # IoT with CAN bus

![pcb_ed](./KiCAD/circuit/v0.2_pcb_3d.jpg)

Printed circuit design for CAN node

(I have not tested the printed circuit board yet, because I have been too busy in other priority works)

## Motivation

I want to develop very cheap and low power sensor/actuator network with electronic parts sold in [Akizuki-Denshi](http://akizukidenshi.com/catalog/default.aspx), Tokyo.

Most of parts I use are DIP.

## Architecture

### Basic concept

I pursue seamless communications between CAN-bus and MQTT-bus:

![concept](./doc/concept.jpg)

## Specification

The CAN node consists of one base board and one expansion board.

See this page for expansion boards: [EXPANSION BOARDS](./EXPANSION_BOARDS.md).

### CAN node base board

|Parameter           |Value                       |Note

|--------------------|----------------------------|---------------------------|

|PIC16F1 MCU clock   |32MHz(Internal OSC 8MHz * 4 PLL)                        |

|UART baud rate      |9600bps (fixed)             |Full-duplex wire-rate is not supported|

|SPI clock           |2MHz (fixed)                |                           |

|CAN speed           |Max. 250kHz (default 125kHz)|                           |

|Oscillator for CAN controller|8MHz (ceramic)     |Murata Ceralock            |

|Expansion board     |8 pins connected to PIC MCU |                           |

#### Circuit

![Circuit](./KiCAD/circuit/v0.2.jpg)

#### PCB

![pcb](./KiCAD/circuit/v0.2_pcb.jpg)

#### BOM

|Part                      |Akizuki-denshi URL |Price in Yen |Quantity|

|--------------------------|-------------------|-------------|--------|

|Microchip PIC16F1825-I/P  |http://akizukidenshi.com/catalog/g/gI-10656/|150|1|

|Microchip PIC16F18326-I/P |http://akizukidenshi.com/catalog/g/gI-11886/|130|1|

|Microchip MCP2515         |http://akizukidenshi.com/catalog/g/gI-12030/|160|1|

|Microchip MCP2561         |http://akizukidenshi.com/catalog/g/gI-12483/|90|1|

|Murata Ceralock 8MHz      |http://akizukidenshi.com/catalog/g/gP-00153/|35|1|

|Regiter 51k ohm           |http://akizukidenshi.com/catalog/g/gR-25513/|1|1|

|Register 10k ohm          |http://akizukidenshi.com/catalog/g/gR-25103/|1|1|

|Register 120 ohm          |http://akizukidenshi.com/catalog/g/gR-25121/|1|1|

|Murata capacitor 0.1 micro F|http://akizukidenshi.com/catalog/g/gP-00090/|10|3|

|Diode 1A                  |http://akizukidenshi.com/catalog/g/gI-08332/|10|1|

|Toshiba TA48M05F (w/ capacitors)|http://akizukidenshi.com/catalog/g/gI-00451/|100|1|

|Polyswitch 250mA          |http://akizukidenshi.com/catalog/g/gP-01354|30|2|

|LED 3mm red               |http://akizukidenshi.com/catalog/g/gI-04780/|20|1|

|Tactile switch            |http://akizukidenshi.com/catalog/g/gP-08216/|20|1|

|IC sockets 14pins         |http://akizukidenshi.com/catalog/g/gP-00006/|10|1|

|IC sockets 18pins         |http://akizukidenshi.com/catalog/g/gP-00008/|10|1|

|IC sockets 8pins          |http://akizukidenshi.com/catalog/g/gP-00017/|10|1|

|Pin socket 6pins          |http://akizukidenshi.com/catalog/g/gC-03784/|20|1|

|Pin socket 4pins          |http://akizukidenshi.com/catalog/g/gC-10099/|20|2|

|Pin header L shape        |http://akizukidenshi.com/catalog/g/gC-01627/|50|1|

|Phenix Contact terminal block 2P|http://akizukidenshi.com/catalog/g/gP-08369/|20|1|

### CAN Standard Identifier format

This implementation supports CAN Standard Frame only (does not support Extended Frame). For home networking, 11bit Standard Identifier suffices.

=> [FORMAT](./doc/FORMAT.md)

### "CAN adapter to UART" command list

This implementation supports CAN adapter functionality for PC and Android.

```

/// UART2CAN HELP (version 0.11  March 19, 2018) ///

[Set standard identifier] @i

[Set output mode] {debug: @vd, verbose: @vv, normal: @vn}

[Enable operation mode] {loopback: @ol, normal: @on}

     with SID: @ols or @ons

[Set mask] @m

[Set filter] @f

[Set baud rate] @b

[Abort all pending transmissions] @a

[Dump masks and filters] @F

[Dump registers] @D

[Send message] 

[Send message beginning with '@' character] @<@message>

[Receive message]  will be output

[Show this help]: @h

```

For example, to receive messages with SID 5, 10 and 15, set masks and filters to the CAN adapter as follows:

```

@m02047  --> RXM0 0b11111111111

@f05     --> RXF0 0b00000000101 (SID 5 message to RXB0)

@f110    --> RXF1 0b00000001010 (SID 10 message to RXB0)

@m12047  --> RXM1 0b11111111111

@f215    --> RXF2 0b00000001111 (SID 15 message to RXB1)

```

---

## Development environment

- Microchip [MPLAB-X IDE](http://www.microchip.com/mplab/mplab-x-ide) with MCC plugin.

- [FreeCAD](https://www.freecadweb.org/)

- [KiCAD](http://kicad.org/)

- [3D printer BIQU Magician](https://www.biqu.equipment/collections/3d-printer/products/biqu-magician-3d-printer-new-diy-kit-mini-kossel-delta-printing)

- [RaspberryPi](https://www.raspberrypi.org/)

---

## Development plan and progress

### M1 (completed on March 17, 2018)

![board](./doc/board.jpg)

- Purchased CAN adaptors from Amazon.

- Evaluate CAN ==> [EVALUATION](./doc/EVALUATION.md).

- Developed my original ASCII-based protocol over serial for MCP2515. The protocol is mainly for evaluating MCP2515.

At first, I use [this universal board](http://akizukidenshi.com/catalog/g/gP-08241/) to make a prototype of the CAN adaptor:

![universal board](./doc/universal_board.jpg)

I have finished the first prototype (Marth 25-27, 2018). I have made three boards, and it took eight hours.

![front](./doc/universal_board_front.jpg)

![back](./doc/universal_board_back.jpg)

![daisy_chain](./doc/daisy_chain.jpg)

### M2 (completed on April 1, 2018)

![3d_printed](./doc/3d_printed.jpg)

3D printed enclosure for CAN node

- Purchase three pairs of MCP2515 and MCP2561 in Akihabara.

- Develop my original CAN adaptor board.

- Develop [CAN-MQTT gateway](./gateway/gateway.js) on RasPi ~~and OpenWrt~~.

- Develop [a 3D-printed DIN rail enclosure](./cad/adapter_to_uart.stl) for the board by using [FreeCAD](https://www.freecadweb.org/).

- ~~Mount all of them on DIN rail (incl. RasPi).~~

- ~~Add [SLCAN](https://elixir.bootlin.com/linux/v3.4/source/drivers/net/can/slcan.c) that is ASCII-based protocol for SocketCAN.~~

### M3

- Evaluate [PIC16F18326](http://akizukidenshi.com/catalog/g/gI-11886/) that is cheaper than PIC16F1825 and supports two MSSPs.

- Use KiCAD to redesign the circuit for PIC16F18326.

- Adopt moduler architecture: base board and sensor/actuator building blocks.

- Support sensors and actuators: doppler sensor, CdS, servo motor etc.

![requirements](./doc/requirements.jpg)

---

## Reference

### Datasheet (Microchip/NXP/Murata)

#### Microchip

- [PIC16F1825](http://ww1.microchip.com/downloads/en/DeviceDoc/41440A.pdf)

- [MCP2515](http://ww1.microchip.com/downloads/en/DeviceDoc/21801d.pdf)

- [MCP2561](http://ww1.microchip.com/downloads/en/DeviceDoc/20005167C.pdf)

- [MCP2515DM-BM](http://www.microchip.com/Developmenttools/ProductDetails.aspx?PartNO=MCP2515DM-BM)

#### NXP

- [TJA1050](https://www.nxp.com/docs/en/data-sheet/TJA1050.pdf)

#### Murata

- [Ceralock](https://www.murata.com/~/media/webrenewal/support/library/catalog/products/timingdevice/ceralock/p17e.ashx)