Tag Archives: IoT

Inexpensive RS485 module with ESP32 (hardware serial)

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

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How to work with RS485 interface on ESP32

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

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Inexpensive RS485 interface board for ESP8266/ESP32/Arduino

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

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IO Expansion Shield For Arduino (V5) (SKU: DFR0088). RS485 interface.

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

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How to work with ThingSpeak.com on ESP8266? Code examples.

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

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RS-485 shields for Arduino

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.

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4-x relay board C0135 managed by Modbus RTU protocol (RS-485)

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

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