Simple compact RS485 node (ATmega328 + MAX485)
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6 years ago
Updated:
5 years ago
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This is RS485 version of a simple RF24 node on Atmega328

D7 pin used for control RS485 DE/RE input.

On long side of board present 11-pin header include:

  • D2, D3, D4, D5
  • A0, A1, A4/SDA, A5/SCL
  • GND, 5V

On short side of board present two pin header include:

  • 5V, GND, D2, D3 (for simple connect sensors like DS18B20, DHT22)
  • RES, TX, RX (for connect UART)

On bottom side of board present MISO, MOSI, SCK and CSN for programming bootloader to ATmega328.

Present place to solder pull-up resistors for RES, D2, D3, SDA, SCL signals.
It is also possible to install LED connected between D6 pin and 5V through 510Ohm resistor.

You can order PCB from PCBs.io - 4pcs for $4.65, black 1.6mm PCB

08/07/2019 UPDATE !!! Tested in hardware now !!!

30/09/2019 ATTENTION !!! Possible unstable work node with LP2950CZ-50 LDO !!! (temporary using AMS1117, order HT7550-1 for testing as LDO for power of 12V)

485 node compared to RF24 Node

485 node compared to RF24 Node

This is my ALARM module base board with installed MYSNodeRS485 module (used to connection PIR sensor of standart secirity system):

ALARM module with RS485 node

ALARM module with RF24 node

This is my LIGHT module with installed MYSNodeRS485 module for lamp connection to MySensors:

LIGHT module with RS485 node

LIGHT module with RS485 node

LIGHT module with RS485 node

LIGHT module with RS485 node

Connection of module:

LIGHT module with RS485 node