README.md

RS485Expander

This is the firmware for an RS-485 port expander based on a PIC16F1825
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Table of Contents

1. About The Project
2. Getting Started
3. Hardware
4. Project Layout
5. History
6. License

About The Project

This is an 8-bit port expander based on a PIC16F1825.

The hardware part of this project can be accessed on Altium 365. An Altium 365 (or CircuitMaker) account is needed to download the files, but they can be viewed online even as a guest.

The boards can be ordered from OSH Park. If necessary, gerber files can be downloaded directly even as a guest.

Note: The above links are not affiliate links. I will not gain money if you download/order from the above links.

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Getting Started

Clone the repository from [email protected]:fra87/RS485Expander.git in a folder called RS485Expander.X.

Before building you will need to generate the MCC files. For this, open the MPLAB® Code Configurator and click on the "Generate" button.

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Hardware

The pins have the following functions:

• RA0: RS485 TX
• RA1: RS485 RX
• RA2: RS485 DIR (0 => receive, 1 => transmit)
• RA3: MCLR (connect to VCC)
• RA4: Expander - CH6
• RA5: Expander - CH7
• RC0: Expander - CH0
• RC1: Expander - CH1
• RC2: Expander - CH2
• RC3: Expander - CH3
• RC4: Expander - CH4
• RC5: Expander - CH5

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Project Layout

• README.md: this file
• LICENSE.txt: file containing the license notice
• main.c: the file containing the main loop
• Makefile: file generated by MPLAB® X environment
• RS485Expander.mc3: file with MPLAB® Code Configurator configuration
• nbproject: folder with MPLAB® X configuration files

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History

Version	Date	Notes
1.0	xx/yy/2022	First release

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License

Distributed under the MIT License. See LICENSE.txt for more information.

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