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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)

I want to develop very cheap and low power sensor/actuator network with electronic parts sold inAkizuki-Denshi, Tokyo.

Most of parts I use are DIP.

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

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

See this page for expansion boards:EXPANSION BOARDS.

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

=>FORMAT

This implementation supports CAN adapter functionality for PC and Android.

/// UART2CAN HELP (version 0.11  March 19, 2018) ///[Set standard identifier] @i<standard identifier>[Set output mode] {debug: @vd, verbose: @vv, normal: @vn}[Enable operation mode] {loopback: @ol, normal: @on}     with SID: @ols or @ons[Set mask] @m<n><mask(SID10 ~ SID0)>[Set filter] @f<n><filter(SID10 ~ SID0)>[Set baud rate] @b<bpr>[Abort all pending transmissions] @a[Dump masks and filters] @F[Dump registers] @D[Send message] <message>[Send message beginning with '@' character] @<@message>[Receive message] <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)

• MicrochipMPLAB-X IDE with MCC plugin.
• FreeCAD
• KiCAD
• 3D printer BIQU Magician
• RaspberryPi

• Purchased CAN adaptors from Amazon.
• Evaluate CAN ==>EVALUATION.
• Developed my original ASCII-based protocol over serial for MCP2515. The protocol is mainly for evaluating MCP2515.

At first, I usethis universal board to make a prototype of the CAN adaptor:

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

3D printed enclosure for CAN node

• Purchase three pairs of MCP2515 and MCP2561 in Akihabara.
• Develop my original CAN adaptor board.
• DevelopCAN-MQTT gateway on RasPiand OpenWrt.
• Developa 3D-printed DIN rail enclosure for the board by usingFreeCAD.
• Mount all of them on DIN rail (incl. RasPi).
• AddSLCAN that is ASCII-based protocol for SocketCAN.

• EvaluatePIC16F18326 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.

• PIC16F1825
• MCP2515
• MCP2561
• MCP2515DM-BM

• TJA1050

• Ceralock