Opis

Relejni modul 2 releja I2C XL9535 5V

Razširite število relejev preko I2C vodila

The I2C XL9535 5V 2-relay module expands the number of relays controllable via an I2C bus, using only two wires (SDA/SCL) on a microcontroller like ESP32 or Arduino. It utilizes the XL9535 chip as an I/O expander, allowing commands to be sent over I2C to control the relays. Optical isolation ensures electrical separation between the control electronics and the power section, protecting the microcontroller from voltage spikes.

The module supports adjustable I2C addresses (0x20 by default, configurable via A0, A1, A2 solder pads) allowing up to 8 modules (16 relays) to be connected to the same I2C bus. It can be powered via USB-C or terminal. Use cases include smart home projects (Home Assistant, ESPHome), controlling lighting or irrigation systems with ESP32, automating projects with limited microcontroller pins, and building control cabinets with minimal wiring..

Ključne lastnosti

• Združljivost z Arduino, ESP32 in drugimi krmilniki
• Napredna komunikacija (I2C)
• Vgrajena zaščita in galvanska ločitev

Tehnične specifikacije

Inženirski “PRO” nasvet

When using this module with ESPHome or Home Assistant, verify the default I2C address (usually 0x20). For inductive loads like powerful motors or pumps, it is recommended to keep the real load up to 7A, despite the 10A specification. This reduces contact overheating and extends relay lifespan during high inrush currents. For stable operation, especially with microcontrollers like ESP32, use an external 5V power supply connected via the USB-C input, as relays consume significant current (70-100 mA per relay) during switching, which can cause microcontroller restarts if powered directly from a computer. When working with 230V, ensure the device is disconnected from the mains before wiring, and enclose the circuit in an insulated housing. Understand NO (Normally Open), NC (Normally Closed), and COM (Common) contacts; most projects use NO. Pull-up resistors for I2C communication are already integrated into the module. For daisy-chaining multiple modules, ensure each has a unique I2C address set via the A0-A2 solder pads.

Primeri uporabe

• Pametni dom in IoT avtomatizacija
• Daljinsko upravljanje naprav preko telefona
• Razširitev I/O pinov pri kompleksnih projektih