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Components

	Wemos D1 Mini	x 1
	MOV	x 1
	Glass fuse holder	x 1
	200 mA glass fuse	x 1
	RS486 to TTL converter board	x 1

Description

ESP8266 Modbus board

This board uses an ESP8266 and an RS486 to TTL converter to allow the ESP to access devices over Modbus. I used this to read from and write to a Beca Modbus Thermostat. You can find the detailed sketch of this project on my github page: https://github.com/nygma2004/beca_mqtt

Parts:

Some are generic parts that I have ordered a long time ago from eBay and since the listing has been removed.

Wemos D1 Mini ESP8266 module (clone)

MAX485 RS-485 TTL to RS485 MAX485CSA Converter Module

Panel Mount PCB Fuse Case Holder With Cover For 5x20mm Fuse

5.08mm Pitch Panel KF301-2P KF301-3P Screw Terminal Block PCB Connector

HLK-PM05 AC-DC 220V to 5V Step Down Buck Isolated Power Supply Module

MOV for 275V

You can watch a short video about this PCB here: https://youtu.be/ziYbEip_HqQ.

Further details in the wiring is in the github read.me.

Code

https://github.com/nygma2004/beca_mqtt

Feb 13,2020

12,681 views

ESP8266 Modbus board

2 Layers PCB 45 x 98.55 mm FR-4, 1.6 mm, 1, HASL with lead, Green Solder Mask, White silkscreen

Connect to Modbus devices with an ESP8266. Check out my project (see github link) where I convert data from a Beca Modbus data to MQTT.

12681

10.00 (2)

Published: Feb 13,2020

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