16CH Relay 12V

A 16-channel 12 V relay board that switches 16 independent loads from microcontroller GPIO signals — with optocoupler isolation on every channel, individual LED indicators, and both NO and NC contacts per relay. The ultimate expansion board for large-scale automation projects.

🔹 Key Applications

• 16-zone home automation and smart home control

• Industrial process 16-stage sequencing

• Large-scale irrigation zone control

• 16-output automated test switching

• Theatre and stage lighting switching

• Building management system zone control

🔹 Why Choose This Module?

• 16 independent channels — maximum switching flexibility

• Optocoupler isolation on every channel — complete MCU protection

• Individual LEDs — instant visual status for all 16 channels

• NO and NC contacts per relay — flexible circuit design

• 12 V coil voltage — powered from standard supplies

🔹 Technical Specifications

• Channels: 16

• Coil Voltage: 12 V DC

• Contact Rating: 10 A / 250 V AC

• Isolation: Optocoupled (per channel)

• Trigger: Active LOW

• Indicators: LED per channel

🔹 What's Included

1 × 16-Channel 12V Relay Board

🔹 Pro Tip

💡 Use a shift register (74HC595) or I2C port expander (MCP23017) to control all 16 channels from as few as 3 Arduino pins — essential when you don't have 16 free GPIO pins. Separate the relay power supply (12 V) from the logic supply (5 V) for clean isolation and to prevent voltage drops from relay switching affecting your MCU.

⚠️ Note: Always ensure proper heat dissipation and correct voltage configuration before powering connected devices.