Drive your DC devices with speed and precision using the B4M Controller. This 4-channel controller replaces traditional relays with MOSFET solid-state switches, making it the ideal choice for applications requiring silent operation, high-speed switching, or PWM control (like LED dimming or motor speed regulation). Powered by the ESP32-S3 and packed in the same compact enclosure as the B4, it offers a perfect blend of fast outputs and versatile inputs for modern automation projects.

Why You'll Love This Controller

✔ Master High-Speed DC Control
Go beyond simple relays. The B4M’s MOSFET outputs let you dim LEDs, control motor speeds with PWM, and switch DC loads silently and without wear.

✔ All-in-One Sensing & Control
Get 4 fast outputs, 4 analog inputs (for sensors like light or current), and 4 digital inputs in one compact DIN-rail device. It's a complete DC automation hub.

✔ Dual-Platform Simplicity
Use the Tuya App for instant smartphone control, while seamlessly integrating with Home Assistant for advanced local automations. Both work perfectly together out-of-the-box.

✔ Built for Real-World Reliability
Features robust opto-isolated digital inputs (good for long wire runs), a precise RTC, manual override buttons, and industrial communication options like RS-485.

✔ Your Project, Your Code
Whether you prefer the easy KCS v3 firmware, ESPHome, Tasmota, or writing your own code in Arduino or ESP-IDF, the B4M gives you complete freedom.

Among other outstanding features are the following:

• High-Current MOSFETs: Each of the 4 outputs utilizes a 10A driver IC, providing robust control for a wide range of DC devices beyond just signal-level loads.
• Dual-Network Connectivity: Equipped with both Wi-Fi and 100Mbps Ethernet for flexible and resilient network integration, ensuring your controller stays connected.
• Precise Time-Stamping & Logging: Includes a high-precision DS3231 RTC chip (with battery backup) for accurate time-based events and a microSD card slot for logging data.
• Mixed Analog & Digital Inputs: Features a 16-bit ADS1115 ADC for accurate analog readings (0-5V and 4-20mA) alongside 4 opto-isolated digital inputs, all configurable for your specific sensors.
• Expandable I/O: Offers 4x 1-Wire GPIOs (with pull-up resistors) for adding temperature sensors and 3x Free GPIOs (direct to ESP32) for maximum flexibility. An I2C bus extender and RS-485 port are also included.
• Manual Override Buttons: Includes physical buttons for each MOSFET output, allowing you to turn loads on or off manually even if the software or network is down.

Technical Specifications: