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The RoHS icon on this product indicates that the PCBs, components, solder, and chemicals are all lead-free and RoHS compliant. Additionally, this product is produced using a lead-free process. Unfortunately, we are currently unable to provide documentation confirming that this product is RoHS compliant.
Resources:
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Package Includes:
This package does not include cables.
Notes:
- This board uses 4-pin, 2.00mm pin pitch connectors for I2C bus.
Features:
- 4 relays on board
- 4 input/output(I/O) ports
- Interrupt(INT) output signal
- Based on PCA9554C
- 400kHz I2C bus frequency
- Addressable via 3 jumpers, supporting up to 8 boards
- Configurable SCL/SDA pull-up resistors
- Operating and logic voltage: 3.0V-5.5V with reverse polarity protection
- Coil voltage: 9V-13V with reverse polarity protection (12V recommended)
- Relay contact rating: 10A @120VAC/24VDC or NO/NC:10A/6A @250VAC rated for 100,000 life cycles
- Prevent relays turning-on during power-up
- Compatible with Arduino, ESP32, Raspberry PI and STM32
- PCB size: 87.50 x 55.00 mm
The I2C-RL412C is an I2C board with 4 relays and 4 input/output (I/O) ports. The board is designed as a remote I2C bus expander based on the PCA9554C. It can be used with Arduino, ESP32, Raspberry Pi, and STM32.
The board supports an I2C bus frequency of up to 400 kHz.
The I2C address is configured using 3 jumpers, allowing up to 8 boards on the same bus. Additionally, up to 16 boards can be connected when both PCA9554B and PCA9554C versions are used together.
The operating and logic voltage is 3.0V–5.5V, with reverse-polarity protection.
The logic voltage of the 4 I/O ports is limited by VCC. Voltage higher than VCC must not be applied to any of the I/O ports.
The relay coil voltage is 9V–13V, with reverse-polarity protection; however, 12V is recommended. The relay contact rating is 10A @ 120V AC / 24V DC or NC/NO: 10A/6A @ 250V AC, and the relays are rated for 100,000 cycles.
The board prevents all relays from turning on during the initial power-up.
Important: To prevent damage to the board, do not plug or unplug I2C cables while the power supply is turning on. Always turn off the power supply before connecting or disconnecting I2C cables.
