Tag Archives: IoT
In the previous article, I reviewed how to connect very cheap RS485 module to the ESP8266. Generally speaking, it’s MAX485 chip without any protection against troubles like lightning and cost about 0,3 $ It’s better to purchase wholesale by 5 … Continue reading
In the last article, I mentioned how to work with RS485 module XY-485 with ESP8266. In this article, I’ll review how to work with XY-485 module with microcontroller ESP32. In the next article, I’ll review using very cheap MAX485 based … Continue reading
RS485 interface providing a noise-resistant connection with the equipment at a distance of up to 1200 meters. The question is how to ensure a secure connection of the microcontroller to the equipment operating on the RS485 interface? When lightning, electronic … Continue reading
In the previous article, I reviewed several Arduino RS485 shields. Some of them are quite expensive, more than 20 USD. In this article, I tested one of Arduino RS485 shields, which costs about 3 USD. I ordered at Aliexpress IO … Continue reading
There are a lot of different cloud services in the Internet working as a storage to accumulate telemetry data from IoT devices. It’s quite comfortable services. You don’t need to spend some time to install a server to collect data … Continue reading
There are a lot of different variants of RS-485 shields for Arduino: https://www.waveshare.com/wiki/RS485_CAN_Shield https://www.tinyosshop.com/arduino-rs232-rs485-shield https://www.dfrobot.com/wiki/index.php/IO_Expansion_Shield_For_Arduino(V5)_(SKU:_DFR0088) https://www.hwhardsoft.de/english/projects/rs485-arduino/ Example of using the shield with Modbus RTU termo sensor. Example, how to work with not expensive Arduino RS485 Shield ordered from Aliexpress.
To test a device management by Modbus RTU commands, we use the circuitry of 4 relays controlled by the STM8S103 controller. (Relay MCU 4-way relay-communication board (RS-485). Manage the relay To turn a relay on/off we will use Modbus “Write Single Coil … Continue reading