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ereshop

EREshop is an electronics maker and online store. The ereshop is an electronic designer and online store.

We design electronic circuits and software, you can view our products on www.ereshop.com.

29/05/2026

This is the third generation of the 8-channel opto-isolator board designed for input expansion over the I²C bus. Each input accepts 5–30 V DC, making it suitable for electronic or semiconductor switching devices such as transistors and FETs, as well as small mechanical switching devices such as relays, buttons, and signal switches.

The board uses the PCF8574 I2C controller chip, supports a 100kHz bus speed, and operates with a bus voltage of 3.3-5.5VDC. It features three jumpers for setting its address, allowing up to 16 boards to be connected on a single bus.

In this version, the board does not include I2C bus pull-up resistors or an interrupt pull-up resistor on board. These pull-up resistors must be connected to the I2C bus externally.

The board can be mounted on a DIN-rail PCB holder, which can be securely attached to a tray.

The difference between the I2C-IN830MxV3 and I2C-IN830MAxV3 lies in the I2C controller chip used. The I2C-IN830MxV3 uses the PCF8574, while the I2C-IN830MAxV3 uses the PCF8574A. The key distinction between the PCF8574 and PCF8574A is their I2C bus address.

https://www.ereshop.com/shop/8-opto-input5-30v-pcf8574-i2c-bus-din-rail-mountable-v3-p-895.html

12/05/2026

The I2C-TC9604KP is a specialized electronics board engineered for accurate temperature measurement through conversion of the electromotive force (EMF) generated by a thermocouple into precise Celsius readings. Central to its design is the MCP9604 chip from Microchip, which incorporates an integrated cold-junction compensation unit to enhance measurement accuracy.
A key feature of the I2C-TC9604KP is its robust error detection capability, allowing it to identify both open-circuit and short-circuit conditions in thermocouple sensors. This functionality significantly enhances reliability and safety during temperature monitoring processes.
The device supports four independent channels for thermocouple inputs. The I2C-TC9604KP is optimized for compatibility with thermocouple type-K. The board delivers exceptional accuracy, with a typical error margin of only ±0.5°C, and provides results at a fine resolution of 0.0625°C, enabling precise control and monitoring.
For user convenience, the board features a dedicated thermocouple plug connector, facilitating straightforward sensor connection. Communication with host microcontrollers is established via the I2C bus protocol, operating at a standard speed of 100 kHz. The I2C-TC9604XP accommodates a wide operating voltage range from 2.7V to 5.5V, offering flexibility for integration into diverse system architectures. Its design also supports easy mounting on electronic case panels, making it well-suited for integration into various instrument enclosures and industrial environments.

https://www.ereshop.com/shop/4-ch-thermocouple-type-k-i2c-bus-mcp9600-panel-mountable-p-893.html

10/05/2026

The I2C-TC9600KP is a specialized electronics board designed for precise temperature measurement by converting the electromotive force (EMF) generated by a thermocouple into a temperature value in degrees Celsius. At its core, the board utilizes the MCP9600 chip from Microchip, which features an integrated cold-junction compensation unit to ensure accurate readings.
One of the notable capabilities of the I2C-TC9600XP is its ability to detect a potential error in the thermocouple sensor, including open-circuit (thermocouple physically disconnected) condition. This improves reliability and safety during temperature monitoring operations.
The I2C-TC9600KP is designed for compatibility with Type-K thermocouple, ensuring optimal performance and accuracy. The board itself offers high measurement accuracy, with a typical error margin of only ±0.5 degrees Celsius. Additionally, the measurement results are provided with a fine resolution of 0.0625 degrees Celsius, allowing for precise monitoring and control.

https://www.ereshop.com/shop/thermocouple-type-k-i2c-bus-mcp9600-panel-mountable-p-883.html

03/05/2026

The new product, I2C-TC9600KP, is a thermocouple temperature measurement board. It connects to a Type K thermocouple and communicates with an Arduino board via the I2C bus. The temperature value is displayed in degrees Celsius on a PC screen. The board uses a single-chip MCP9600 from Microchip.

https://www.ereshop.com/shop/thermocouple-type-k-i2c-bus-mcp9600-panel-mountable-p-883.html

02/05/2026

I2C-IN830MA0V3 is the third generation of the 8-channel opto-isolator board designed for input expansion over the I²C bus. Each input accepts 15–30 V DC, making it suitable for small mechanical switching devices such as relays, buttons, and signal switches.

The board uses the PCF8574A I2C controller chip, supports a 100kHz bus speed, and operates with a bus voltage of 3.3-5.5VDC. It features three jumpers for setting its address, allowing up to 16 boards to be connected on a single bus.

In this version, the board does not include I2C bus pull-up resistors or an interrupt pull-up resistor on board. These pull-up resistors must be connected to the I2C bus externally.

The board can be mounted on a DIN-rail PCB holder, which can be securely attached to a tray.

29/04/2026

This is the second version of the I2C bus relay board, designed as a remote 8-relay expander for the I2C bus, based on the PCF8574. It is ideal for expanding relay outputs via I2C, and it is compatible with most microcontrollers.

The board supports a 100kHz I2C bus frequency. Addressing is done via 3 jumpers, allowing up to 8 boards (64 relays). Additionally, up to 16 boards (128 relays) can be connected when both PCF8574 and PCF8574A are used on the same bus.

The operating logic supply voltage is 2.5V DC - 5.5V DC, with inverse polarity protection.

The relay supply voltage is 9V DC - 13V DC, with inverse polarity protection (12V DC recommended). The relay contact rating is 10A @ 120V AC / 24V DC or 6A @ 250V AC, rated for 100,000 life cycles. The board also includes relay power-on protection.

27/04/2026

This is an I2C-bus thermocouple board, I2C-TC31855DK. The board is designed around the MAX31855, a high- precision, cold-junction compensated thermocouple to digital converter. Since the MAX31855 uses SPI interface, a microcontroller typically requires at least three pins to communicate with a single chip. Furthermore, when multiple MAX31855 chips are connected, even more pins are needed.

However, this board is designed to convert the MAX31855’s SPI interface to an I2C bus, requiring only two microcontroller pins for communication. Additionally, multiple boards can be connected to the same I2C bus without increasing the number of required pins. The microcontroller can easily read temperature data via the I2C bus.

The board supports two different I2C addresses on a single bus. It also includes jumpers to enable pull-up resistors for SCL and SDA lines. The board can be mounted on a DIN-Rail PCB holder for industrial applications.

Since the MAX31855 operates at 3.3Vdc then it is not directly compatible with the 5Vdc system. However, this board is designed to function with both 3.3Vdc and 5Vdc, making it more versatile.

24/04/2026

How to control a solid-state relay with an I2C bus.

The I2C-ER1001 board is a burst-fire solid-state relay controller via the I2C bus. The board can interface with most microcontrollers and provides fast, silent switching — offering a better alternative to mechanical relays.

The I2C burst-fire solid-state relay controller adjusts the load power in a smooth, linear way, which is superior to simple on-off control.

It is suitable for heating control applications or projects that require I2C relay control, such as Raspberry Pi or Arduino.

• Burst Fire Control System
• Controls Solid State Relays via I2C bus
• Supports 100Khz and 400Khz I2C bus frequencies
• Onboard pull-up resistors for SCL and SDA lines
• 10-Step Solid State Relay Control
• Operating Voltage: 3Vdc – 5Vdc
• Addressing up to 4 addresses via jumpers
• PCB size optimized for mounting on Solid State Relays
• Suitable for Thermal Management Applications
• LED indicator included
• Control up to 4 SSRs on a single I2C bus
• Period time: 200ms

23/04/2026

Many electronic devices such as sensors and actuators interface with microcontrollers through the I2C bus. However, the I2C bus has some limitations, including the number of available addresses and the bus capacitance. All devices on the same bus must have a unique address, but many devices are manufactured with identical addresses, even when produced by different companies.
Another limitation is bus capacitance, which depends on the number of devices connected to the bus and the length of the cables. Increasing the number of I2C buses can solve these issues. However, if a microcontroller does not provide enough I2C buses, bus multiplexing can offer a practical solution.

The I2C-MUX9548M is an 8-channel bidirectional I2C bus multiplexer. It is designed based on the TCA9548A, which can switch the SCL and SDA lines of a master I2C bus to eight different channels. The signals on the master SCL and SDA lines can be routed to individual channels or to any combination of channels.

The I2C-MUX9548M supports bus frequencies up to 400 kHz and includes selectable pull-up resistors for the SDA and SCL lines of both the master bus and each individual channel. The board also provides a RESET pin with a pull-up resistor.

For protection, the board includes reverse-polarity circuitry to prevent damage to the TCA9548A caused by incorrect power supply connections.

The I2C-MUX9548M supports a wide operating-voltage range, making it suitable for use with both low-voltage microcontrollers and standard 5V microcontrollers.

For industrial applications, the board can be mounted on a DIN-Rail PCB holder.

The link for more details for this product, please see in comments.

18/04/2026

The ER1000 heater controller regulates a hot plate using the burst-fire principle and adjusts the heat via a potentiometer (POT). Please see more details in the comments.