Feather_M4_Modbus_Example

This example is built using the Adafruit Feather M4 Express, Adafruit Ethener Featherwing and the built-in NeoPixel. This aim of this project is to create a modbus reference design using common and readily available hardware, software and libraries.

Flow Chart

![[Modbus_Neopixel_Demo_Flow_Chart.png]]

Modbus Reg Map

Coils (0xxxx)

Discrete Inputs (1xxxx)

Reg	Addr	Description
Enable	20001	Enable bit

Input Registers (3xxxx)

Reg	Addr	Description
Brightness	30001	Brightness
Color_Chan	30002-30004	Color Channels
Red	30002	Red Channel
Green	30003	Green Channel
Blue	30004	Blue Channel

Holding Registers (4xxxx)

Reg	Addr	Description
UID	40001	Unique ID
MAC_ADDR (0:5)	40002-40006	MAC Address
MAC_ADDR_0	40002	$MAC_0$
MAC_ADDR_1	40003	$MAC_1$
MAC_ADDR_2	40004	$MAC_2$
MAC_ADDR_3	40005	$MAC_3$
MAC_ADDR_4	40006	$MAC_4$
IP_ADDR (0:4)	40007- 40010	IP Address
IP_ADDR_0	40007	$IP_0$
IP_ADDR_1	40008	$IP_1$
IP_ADDR_2	40009	$IP_2$
IP_ADDR_3	40010	$IP_3$

Parts

• Feather M4 Express
• Featherwing Ethernet

Documents & Setup

• FeatherM4 Getting Started
  • Adding the board to Arduino IDE
  • Install the Adafruit SAMD boards in the board explorer
  • Select Adafruit Feather M4 Express and allow Arduino IDE install the SAMD Boards
  • Libraries to install
    • Ethernet
    • Modbus
    • Adafruit NeoPixel
  • Modbus Example from Arduino
  • Modicon Modbus Docs
  • Modbus Data Address Format
• Python & Tkinter Modbus GUI Example