When it comes to compact automation hardware, size usually comes at the cost of features. Most boards that pack Wi-Fi and relay control end up being bulky or limited in flexibility. That’s why I found the WiFIRCard particularly interesting – a credit card-sized ESP32-S3 based board that combines wireless connectivity, dual relays, IR transmitter/receiver, and a whole range of features tailored for both DIY enthusiasts and serious automation projects.
Credit card-sized smart control board
WiFIRCard gets its name from its Wi-Fi connectivity and built-in IR (infrared) support. Despite its small footprint, the board integrates everything you’d need for smart home and IoT projects – from relay switching and GPIO breakout to MicroSD logging and voice assistant compatibility.
WiFIRCard specifications
- Microcontroller – ESP32-S3 WROOM-1 module with Xtensa dual-core 32-bit LX7 processor
- Connectivity – 2.4 GHz Wi-Fi and Bluetooth 5 (LE)
- Memory – Up to 16 MB Flash, 8 MB PSRAM
- Relay control – 2x onboard relays with opto-isolation and screw terminal outputs (NO/COM/NC)
- IR functionality – Onboard IR transmitter and receiver (learn & emulate remote signals)
- Storage – MicroSD (TF card) support for logging and data storage
- Programming – USB Type-C interface, supports Arduino, MicroPython, CircuitPython, and C/C++
- Indicators – 2x programmable LEDs + buzzer for visual/audio alerts
- GPIO expansion – Screw terminals + header pin breakout for sensors/actuators
- Supply voltage – 5V via Type-C or screw terminal
- Cloud support – Works with Alexa, Google Assistant, Blynk, MQTT, and Home Assistant
Unlike many low-cost relay boards, WiFIRCard has been designed with precision and durability in mind. It uses an open PCB track with enhanced solder masking to maximize current flow, ensuring reliable high-load performance. The relays feature multiple isolation protection circuits, providing a safer and more dependable experience for automation setups.
WiFIRCard has just launched on Kickstarter at an early bird price of $39 (Retail: $55). Other reward tiers include multi-pack options for makers, classrooms, and IoT labs.
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