ESP32 MASTER - ARDUINO NANO SLAVEs with IC MAX485 and MODBUS PROTOCOL
Posted: Wed May 03, 2023 12:07 am
Hello everyone, I have some communication problems between ESP32 and Arduino Nano via IC MAX485 and with the use of the Modbus protocol, I would like some help from you ESP32 experts.
I'll explain in detail where I have problems: I'm using a 38 PIN ESP32 WROOM 32 as Master in a project I made a couple of years ago with Arduino Nano V3. My initial project was to use Arduino nanos as slaves that were polled by another Arduino nano as masters. Now I would like to replace the Arduino nano Master with the ESP32 to have more performance.
I state that for me it is the first time that I use the ESP32, so forgive me the ignorance I show on this MCU.
Attached is what I've made at the moment on breadboard.... everything works except the communication between ESP32 and Arduino nano.
At the moment I'm testing the communication with only one slave, but actually the project has 4 slaves (all Arduino nano V3)
I am using Software Serial for serial communication. Below is the master's sketch.... in zip file..
thanks in advance to those who want to help me out.
I'll explain in detail where I have problems: I'm using a 38 PIN ESP32 WROOM 32 as Master in a project I made a couple of years ago with Arduino Nano V3. My initial project was to use Arduino nanos as slaves that were polled by another Arduino nano as masters. Now I would like to replace the Arduino nano Master with the ESP32 to have more performance.
I state that for me it is the first time that I use the ESP32, so forgive me the ignorance I show on this MCU.
Attached is what I've made at the moment on breadboard.... everything works except the communication between ESP32 and Arduino nano.
- master_esp32_01.png (666.49 KiB) Viewed 1735 times
I am using Software Serial for serial communication. Below is the master's sketch.... in zip file..
thanks in advance to those who want to help me out.