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XL9535 8-Channel I2C Expansion Relay Module - 5V Opto-Isolated

Relay Boards
β‚Ή1,199.00 β‚Ή 1016.1 + 182.9 GST
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PRO5506

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Control 8 high-power relays using only 2 wires (I2C). Features the XL9535 IO expander for addressable expansion up to 64 channels. Ideal for ESP32/Arduino automation.

Running out of GPIO pins on your ESP32 or Arduino? It’s the classic maker problem: you want to build a serious home automation system, but your microcontroller only has a handful of usable pins. Connect a display and a few sensors, and suddenly you have no room left to control your lights or fans. The XL9535 8-Channel I2C Expansion Relay Module is the smart solution to this bottleneck. Instead of using 8 separate wires for 8 relays, this board uses the I2C bus (just 2 wires!) to drive everything. It effectively converts your pin-limited microcontroller into a powerhouse capable of handling complex switching tasks without the wiring mess.

Industrial-Grade Reliability & Isolation This isn't just a basic relay board; it is engineered for stability in noisy electrical environments. Each of the 8 channels is fully Opto-Isolated, meaning your sensitive microcontroller logic is electrically separated from the high-voltage switching side. This design prevents back-EMF, noise interference, and voltage spikes from crashing your system—a common headache in 220V projects. With our Probots Logic-Safe™ ????️ verification, we ensure the input logic is perfectly compatible with standard 5V logic levels, guaranteeing reliable triggering without overstressing your data lines.

 

Specifications:

  • Operating Voltage: 5V DC
  • Interface: I2C (SDA, SCL)
  • Channels: 8 Independent Channels
  • Relay Rating: 10A @ 250VAC / 10A @ 30VDC
  • Isolation: Optocoupler isolation for each channel
  • I2C Address Range: 0x20 to 0x27 (Selectable via DIP switch/Jumpers)
  • Expansion Capable: Daisy-chain multiple modules on the same bus
  • Indicators: Power LED and individual Status LEDs for each relay

Applications:

  • Smart Home Distribution Box: Control multiple room lights from a single central controller.
  • Greenhouse Automation: Manage water pumps, grow lights, and ventilation fans simultaneously.
  • Industrial PLC Replacements: Low-cost alternative for non-critical industrial switching tasks.
  • Holiday Lighting Control: Create complex lighting sequences without using 50 wires.

Project Evolution

  • The Upgrade: This module unlocks the ability to build a central "Power Distribution Unit" for a room or greenhouse.
  • New Power: You can now control 8 devices (Lights, Fans, Pumps, Locks) while leaving your microcontroller's pins free for advanced sensors like Temperature (DHT22) or Displays (OLED).
  • Effort Level: Intermediate. Requires understanding of I2C addresses and installing a library.
  • Minimum Hardware: An Arduino UNO, Nano, or ESP32 and 4 jumper wires.

Virtual Technician: Wiring Guide ????️
Warning: High Voltage Safety!

  • AC Mains: When switching 110V/220V, ensure the board is mounted in a non-conductive enclosure. Do not touch the bottom of the PCB while powered.
  • Power Supply: This board needs a solid 5V external power source. Do not power the Relay VCC strictly from the Arduino's 5V pin if switching all relays at once; it may draw too much current (~600mA).

Pin Mapping (I2C Interface):

  • VCC: Connect to 5V (External Supply Recommended).
  • GND: Connect to Common Ground.
  • SDA: Connect to Microcontroller SDA (A4 on Uno, D21 on ESP32).
  • SCL: Connect to Microcontroller SCL (A5 on Uno, D22 on ESP32).

Package Including:

1 X XL9535 8-Channel I2C Expansion Relay Module - 5V Opto-Isolated

1 X Jumper wire Connector

Frequently Asked Questions (FAQ)

  1. Does this work with ESP32 and ESP8266?
    Yes, it works perfectly via the I2C interface (3.3V logic is generally tolerated on I2C, but a logic level converter is recommended for long-term reliability).
  2. What is the default I2C address? The default address is usually 0x20, but it can be changed to 0x21-0x27 using the onboard address selection jumpers.
  3. Can I use this with a Raspberry Pi?
    Yes, you can control it using Python libraries (like smbus) compatible with I/O expanders.
  4. How many of these boards can I chain together?
    You can connect up to 8 boards on a single I2C bus, giving you control of 64 relays.
  5. Do I need a separate power supply?
    Yes, we highly recommend a separate 5V 2A power supply for the relays, as the coil current for 8 relays exceeds the limit of most USB ports.
  6. What happens if the I2C signal is lost?
    The relays will generally stay in their last known state until power is reset or a new command is sent.
  7. Is the XL9535 the same as the PCF8574?
    No, the XL9535 is a 16-bit expander (often used here for 8 relays + extras) and uses different registers. Do not use a PCF8574 library.
  8. Can I switch DC loads like motors?
    Yes, the relays are rated for 30V DC at 10A. For inductive loads like motors, adding a flyback diode at the motor is good practice.
  9. Are the relays "Active Low" or "Active High"?
    This depends on the library and wiring, but typically setting the expander pin output to LOW activates the optocoupler and turns on the relay.
  10. Why are the LEDs dim when I plug it in?
    Ensure your 5V power supply can deliver enough current. Weak power causes dim LEDs and chattering relays.
  11. Does it support 3.3V directly?
    The VCC for the relays must be 5V. The I2C lines can work with 3.3V logic, but check if pull-up resistors on the board are pulling up to 5V (if so, use a level shifter).
  12. Can I control individual relays independently?
    Yes, the I2C protocol allows you to address specific bits to toggle individual relays without affecting others.
  13. What is the maximum switching voltage?
    The relays are rated for a maximum of 250V AC.
  14. Does this board have mounting holes?
    Yes, it typically features 4 mounting holes for standard M3 screws.
  15. Can I use this with Arduino Mega?
    Absolutely. Use pins 20 (SDA) and 21 (SCL) on the Mega.
  16. Is there a specific library you recommend?
    Libraries generic to "PCA9555" or "XL9535" often work well. The 'sparkfun_pca9535' or similar community libraries are good starting points.
  17. How do I change the address?
    There are usually A0, A1, A2 address pads or DIP switches. Shorting them to VCC or GND changes the address bits.
  18. Is it compatible with Home Assistant (ESPHome)?
    Yes, ESPHome supports generic I/O expanders (PCA9555/XL9535), making it easy to integrate into Home Assistant.
  19. What is the current draw per relay?
    Each relay draws about 70mA-90mA when active. All 8 on requires ~600mA-700mA.
  20. Can I replace the relays if they fail?
    The relays are soldered to the PCB. Desoldering is required to replace them.

     
     
More Information
Operating Voltage:5 V
Max Current:10 A
Number of Channels:8 Channel
Trigger Type:Low Level
Isolation:Opto-Isolated
Interface Type:I2C
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  • Place an order online our website probots.co.in for quick and fast delivery
  • You can contact us by phone, Whatsapp or Mail for bulk enquiries, technical queries or order related enquiries before placing the order.
  • If you require a Quotation or PI for your company, send us a request mail and we will help you with it.

Delivery Time?

We delivery electronics components and parts throughout India using standard couriers like Bluedart, Delhivery & India Post.

  • Dispatch Time: 1 Working Day for most orders
  • Guranteed Delivery Time: 1-3 days within India under Express Shipping

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  • Customers can visit our store to buy parts directly
  • Alternatively, you can place orders online and select Select Pickup as the delivery option and have your order picked up by Dunzo, Porter, etc. Please contact us for confirmation before arranging a pickup.

Need Help?

For order related queries contact -

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  • Whatsapp: +91 8618050706
  • Mail: info@probots.co.in

7-Day Warranty

This item is covered by a warranty of 7 days from the date of delivery, against confirmed manufacturing defects only, as verified by Probots' own testing and investigation. In case of a confirmed defect, we will replace the item β€” a refund is issued only if a replacement can't be supplied (e.g. discontinued or out of stock). Transit damage or a wrong item received must be reported within 3 days of delivery.


What voids the warranty:

If the product shows signs of misuse, tampering, physical damage, static discharge, liquid or fire damage, use of unapproved chemicals, or has been soldered or physically altered in any way.


Country of Origin

China

Probots sells every Electronics Part for your next Project. You can order 10,000+ Electronic Parts Online - Arduino, Raspberry Pi, NodeMCU Development Boards, Sensors, Motors, Motor Drivers, SMPS, Plastic Enclosures etc in India directly on probots.co.in

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Buyed them. But no bargain. Helpful staff.

prateek chiko
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MANJUNATH S
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Available all children school project spears parts like electronics

Madhuraj K
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GAGAN BHASKAR
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It was good experience

RAJESH MENON
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Arun ___
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Jannat Akthar
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Shashi Kiran
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Staff is very patient and helpful

Siddharameshwara
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One of the best place for electronics you will get everything you want! With the best and orginal quality

Niranjan n
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Very helpful staff and the best place to buy components for projects

GuruRaj Kulkarni
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Wonderful store with expert service and technically strong people.

mohan raju
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Prompt delivery, excellent technical support

SR Techtronic
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Shailesh Muralidhar Kodkani
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Large inventory of electronic components and parts. Well trained service personnel and technicians who can quickly identify and rectify product defect if any. They are a reliable and trustworthy online stores.

Nischal m
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