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

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β‚Ή249.00 β‚Ή 211.02 + 37.98 GST
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PRO5499

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Control high-power loads via I2C with this compact 1-channel relay module. Features the XL9535 expander, optocoupler isolation, and selectable addresses for chaining multiple units.

The Pin Scarcity Problem Are you hitting the limit of your microcontroller's digital capabilities? It’s a common bottleneck in growing projects: you want to add "just one more" heavy-duty switch for a fan or solenoid, but your Arduino Uno or ESP32 is already maximizing its GPIOs for sensors and displays. Standard relays are "pin-hungry," demanding a dedicated wire for every single channel. This limitation often forces makers to upgrade to expensive, larger boards just to get a simple switch working.

The XL9535 1-Channel I2C Expansion Relay Module solves this by shifting the control logic to the I2C bus. Instead of occupying a digital I/O pin, this smart module piggybacks onto the existing SDA/SCL lines you are likely already using for a display or sensor. By utilizing the robust XL9535 16-bit I/O expander architecture, this board listens for specific address commands, allowing you to control high-power AC or DC loads with zero additional pin overhead. It effectively transforms a mechanical switch into an addressable digital node.

This module represents a shift from "Direct Wiring" to "Bus Architecture." Once you master this module, you unlock the ability to chain multiple devices. Because the XL9535 supports hardware address selection, you can daisy-chain multiple relay modules on the same two wires. This is the exact architecture used in professional home automation systems to minimize cabling. Whether you are building a distributed smart home network or a complex robotics control unit, this module scales with your ambition.

 

Specifications:

  • Operating Voltage: 5V DC
  • Communication Protocol: I2C / IIC
  • Relay Rating: 10A @ 250VAC / 10A @ 30VDC
  • Isolation: Optocoupler integrated for signal protection
  • Address Selection: Onboard Jumpers (Selectable I2C addresses)
  • Indicator: Power LED & Relay Status LED
  • Terminals: Screw terminals for Load (NO/COM/NC); Pin headers for Control (VCC/GND/SDA/SCL)

Applications:

  • Smart Home Nodes: Distributed light switching without running individual control wires to a central hub.
  • IoT Edge Devices: Perfect for ESP8266-01 or ESP32-CAM modules where GPIO pins are extremely scarce.
  • Industrial Automation: Controlling solenoids and contactors while maintaining galvanic isolation from the PLC/MCU.
  • Modular Power Banks: Create individually switchable power outlets for test benches.

Virtual Technician: Wiring Guide

  • VCC: Connect to 5V DC (Stable source required for coil).
  • GND: Connect to Common Ground.
  • SDA: Connect to Microcontroller SDA.
  • SCL: Connect to Microcontroller SCL.
  • NC/COM/NO: Standard Relay Output (Normally Closed, Common, Normally Open).

Project Evolution

  • Where you've been (The Prerequisite): You’ve likely started with a standard Single Channel 5V Relay directly connected to a digital pin (like Pin 13) on your Arduino to toggle a fan or light. It was simple, but it didn't scale—wiring four of them meant losing four valuable pins and dealing with a mess of jumper wires.
  • What this product unlocks (The Upgrade): The XL9535 I2C Relay upgrades you to Bus-Based Architecture. This isn't just a switch; it's an addressable node. By moving to I2C, you unlock the ability to chain up to 8 relays on the same two wires (SDA/SCL). This is the same technology used in professional building automation systems to control hundreds of devices without running thick cable bundles. You are effectively trading a bit of code complexity for massive hardware scalability.

⚠️ Probots Logic-Safe™ Warning: While the XL9535 is robust, always ensure your I2C pull-up logic matches your microcontroller voltage (3.3V for ESP32/Pi, 5V for Arduino AVR). The relay coil must have a clean 5V source.

Package Including : 

1 X XL9535 1-Channel I2C Expansion Relay Module - 5V
1 X Jumper wire Connector

 

 

 

Frequently Asked Questions (FAQ)

  1. What is the I2C address of the XL9535 relay module?
    The default address varies by batch but is usually configured via the onboard A0/A1/A2 jumpers. Use an I2C Scanner sketch to confirm.
  2. Can I use this relay with ESP32 or ESP8266?
    Yes, it is compatible. Ensure you power the VCC pin with 5V, as the relay coil requires 5V to switch.
  3. Does the XL9535 relay work with Raspberry Pi?
    Yes, it works via the I2C bus on GPIO 2 (SDA) and GPIO 3 (SCL). Python libraries for XL9535 are available.
  4. How many of these relays can I chain together?
    The XL9535 supports up to 8 unique addresses, allowing 8 modules on a single I2C bus.
  5. Do I need a specific library for Arduino?
    You can use the standard Wire.h library or specific XL9535 libraries available in the Arduino Library Manager.
  6. Is this relay optically isolated?
    Yes, the board features an optocoupler to isolate the high-voltage side from the I2C logic side.
  7. What is the maximum current this relay can handle?
    The relay is rated for 10A at 250VAC or 30VDC. For continuous loads, we recommend keeping it under 7A.
  8. Can I switch 220V AC household appliances?
    Yes, the relay is rated for mains voltage, but exercise extreme caution and ensure proper insulation.
  9. Why is the relay clicking but the device is not turning on?
    Check your wiring on the COM (Common) and NO (Normally Open) terminals. Also ensure the load has its own power source.
  10. Does this module support latching?
    No, this is a monostable relay. It requires power to stay in the "ON" state.
  11. Can I change the I2C address manually?
    Yes, look for the solder pads or DIP switch labeled A0, A1, A2 to change the address bits.
  12. What happens if I disconnect the I2C wires while it is on?
    The XL9535 may maintain its last state until power is cycled, but it is not guaranteed. Design fail-safe code.
  13. Is the XL9535 better than the PCF8574?
    The XL9535 is a 16-bit expander while PCF8574 is 8-bit. For a single relay, performance is similar, but XL9535 offers different addressing options.
  14. Does it require external pull-up resistors?
    Most modules have built-in pull-ups on the SDA/SCL lines. Check the PCB; if missing, add 4.7kΩ resistors.
  15. Can I control this with a computer via USB?
    Yes, if you use a USB-to-I2C adapter (like FT232H) and appropriate software.
  16. What is the quiescent current (standby power)?
    The chip itself consumes microamps, but the onboard power LED adds a few milliamps.
  17. How do I wire a DC motor to this?
    Connect the power source positive to COM, motor positive to NO, and complete the circuit with ground.
  18. Is this module suitable for high-frequency switching?
    No, mechanical relays wear out. For fast switching (PWM), use a MOSFET or SSR module.
  19. What logic voltage levels are supported?
    The I2C bus is typically 3.3V to 5V tolerant, but VCC must be 5V for the relay coil.
  20. Does it come with a Flyback diode?
    Yes, the module includes a protection diode across the relay coil to prevent back EMF from damaging the circuit.
More Information
Operating Voltage:5 V
Max Current:10 A
Number of Channels:1 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
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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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PURUSHOTHAM N K
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Shubham Dutta
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Good stuff

Mojo
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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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