IT & Business

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 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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Inexpensive Modbus RTU to Modbus TCP Elfin EW-11 Wi-Fi converter (RS485)

Modbus RTU (RS485 interface) to Modbus TCP converters from the top producers like Moxa, Advantech, Schneider, ABB and etc. are quite expensive. Of course, the quality and reliability of these industrial devices are really very high. Sometimes the most important parameter … Continue reading

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Azure IoT Solutions. Stopping/starting Azure IoT related services to cut costs.

After installing Azure IoT Solutions (free trial) in a couple days you’ll realize that IoT related services permanently consume your money and there is no easy way (the one button) how to manage this. Money just dries up. But, it’s … Continue reading

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