8 Channel Opto Isolated Electromagnetic Relay Module with I2C Interface, PCF8574

• compatible with Home Assistant / ESPHome

• DUAL Power support - 3.3V for logic side and 5.0V for relays

Product description:

• PCB board dimension 72mm x 150mm
• Compatible with DIN rail plastic holder
• Operation DC voltage – 3.3V and 5.0V
• Maximum current @5.0V – 700mA
• Maximum current per relay – 10A peak
• LEDs indicators for each electromagnetic relay channel
• Relays with SPDT switch contacts: Normally Open, Common, Normally Closed
• Relay contact resistance 100 milliohms max. ( initial value )
• Relay insulation resistance 100 MOhm min. (DC 500V)
• Relay operation time 8 ms max
• Relay release time 5ms max
• Relay dielectric strength 750 VAC, 50/60Hz between contact
• Relay dielectric strength 1,500 VAC, 50/60Hz between all elements
• Relay expected life Mechanical - 10,000,000 operations min.
• Relay expected life Electrical - 100,000 operations min. at rated load
• Working temperature range - 25 C ~ + 80 C
• Comes with different slave address 0x27 or 0x3F, depends on the batch
• Each board can be assigned an I2C address between 0x20...0x27 (0x38...0x3F) by the DIP switch
• The module contains an PCF8574 or PCF8574A chip
• The SDA and SCL lines are pulled up to D.VCC with 5.6k resistors on the relay module.
• Up to 8 boards can be connected to I2C bus line.

PIN description:

• A.VCC - analog (relays) power supply
• A.GND - analog (relays) ground
• D.VCC - logic side (digital) power supply
• D.GND - logic side (digital) ground
• SDA - i2c serial data
• SCL - i2c serial clock

Sample codes:

• Arduino sample code for 0x27 slave address - https://drive.google.com/open?id=1bhoR4dusLg54g0WM_b_a0Efto5wGJ3SZ

• Arduino sample code for 0x3F slave address - https://drive.google.com/open?id=14HXx25LMoYRrmThCqxxRv5AvvmoChJDV

• Code for controlling each channel separately - https://drive.google.com/open?id=1xvJZBvRlOtW8DJ1urEnSKOScQ5fM5Zs1

• Multiboards controlling code - https://drive.google.com/open?id=131HilQV8ZbCkEMC_oS3NJGbEQn-aUKaF

• Home Assistant *yaml code - https://drive.google.com/file/d/1puJG7e_3uAKEAuQfctY5cBt5C62L2Q1I/view?usp=sharing

Free contact me, if you have any question !