Tiny Contacts

by Sergio Ghirardelli in Circuits > Electronics

80 Views, 1 Favorites, 0 Comments

Tiny Contacts

Tiny contacts 1 copertina.png

Tiny Contacts

An ultra-compact 4-channel SMD relay board engineered for space-constrained IoT and home automation setups. Designed to interface low-power microcontrollers (3.3V/5V) with medium loads seamlessly.


🛠️ Key Features


  1. Ultra-Compact Footprint: Only 42 mm x 38 mm, perfect for custom enclosures and tight spaces.
  2. 4-Channel Relay Control: Built with Omron G6K-2F-Y low-signal SMD relays for fast, reliable switching.
  3. Integrated Driver IC: Powered by the ULN2003A Darlington transistor array, protecting MCU GPIO pins from inductive kickback.
  4. Universal MCU Compatibility: Fully compatible with ESP32, ESP8266, Arduino, ATtiny, and STM32.
  5. Status LEDs: Onboard indicators for power state and channel activity monitoring.


📊 Technical Specifications


  1. Board Dimensions: 42 mm x 38 mm
  2. Operating Voltage (VCC):5V DC
  3. Logic Input Level: 3.3V – 5V TTL
  4. Relay Type: Omron G6K-2F-Y (SMD, Low-Signal)
  5. Driver IC: ULN2003A
  6. Channels: 4 Independent Relays


Supplies

Tiny contacts 3.png
  1. PCB (link) quantity:1
  2. Led smd 1206_3216metric quantity:4
  3. Connector pinHeader 1x06 p.2.54 vertical quantity:1
  4. Connector pinHeader 1x03 p.2.54 vertical quantity:8
  5. Relay SMD DPDT Omron G6K-2F-Y-DC5 quantity:4
  6. Resistor smd 1206_3216metric 330 ohm quantity:4
  7. IC ULN2003A smd SOIC-16 quantity:1

Solder ULN2003A

Tiny contacts 7.png
Tiny contacts 4.png

Install ULN2003A SMD IC, hot air soldering iron is recommended

Solder Diodes and Resistors

Tiny contacts 5.png

SMD components

Solder Relays

Tiny contacts 6.png

Solder Connectors

Tiny contacts 8.png
Tiny contacts 9.png

Enjoy!

Tiny contacts 10.png

The Tiny Contacts relay module is ready to be used for your projects!