DT‑R016 16‑Channel Ethernet Relay Module – DTWonder / Dingtian

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Intro Summary
Multi‑interface 16‑ch Ethernet relay board with ESP32—ideal for smart home, industrial control, and Home Assistant integration.

Product Overview
The DT‑R016 is a robust, flexible Ethernet relay module featuring 16 relays and inputs, powered by an ESP32. Measuring 250×107 mm, it supports 12/24 V DC/AC and handles 2 A loads per channel (9 W max) . It offers multiple interfaces (RJ45, Wi‑Fi, RS485, CAN, Wiegand), and supports common protocols: MQTT, Modbus‑TCP/RTU, HTTP GET/CGI, CoAP, and TCP/UDP . Key features include IP watchdog, timers, mutual-exclusion/linkage, jog control, and OTA firmware updates .

How to Use

  1. Power & Network: Provide 12/24 V DC or AC, connect to LAN via RJ45 or Wi‑Fi.
  2. Initial Setup: Use DTWonder or Dingtian web UI to set IP, protocols, watchdog, timers.
  3. Protocol Integration: Interface via MQTT, Modbus‑TCP, HTTP GET/CGI; ideal for Home Assistant, Domoticz, OpenHAB, or Node‑RED .
    1. Advanced: Order dev board variant for unlocked ESP32 bootloader to flash ESPHome (via USB‑TTL on IO0, RX/TX).
    1. Safety Tips: Ensure mains wiring follows local electrical standards; don’t exceed relay current ratings and use the IP watchdog feature carefully.

Related Videos

– shows similar functionality on 8‑channel model, helpful for understanding setup.

Frequently Asked Questions (FAQ)

  1. What voltage does it require?
    Runs on 12/24 V DC or AC; each channel supports ~2 A load .
  2. Can it work with Home Assistant?
    Yes—supports MQTT, HTTP GET, Modbus‑TCP; can flash ESPHome when ordering dev version .
  3. Do I need special firmware?
    Standard firmware supports protocols; dev version allows ESPHome.
  4. How many inputs and outputs?
    16 relay outputs plus 16 digital inputs .
  5. What protection features?
    Includes IP watchdog, timers, jog, mutual-exclusion, linkage & OTA .
  6. Is Wi‑Fi included?
    Yes—Ethernet + Wi‑Fi as standard.
  7. Can I flash my own firmware?
    Dev version ships with unlocked ESP32 bootloader; standard version is locked .
  8. How large is it?
    About 250×107 mm .
  9. What protocols supported?
    MQTT, Modbus RTU/TCP, HTTP, TCP/UDP, CoAP, CAN, Wiegand, RS485 .
  10. Is there Home Assistant community support?
    Yes—users report rock‑solid performance and fast MQTT responsiveness (<1 s) .

User Review Summary
Reddit users praise the DT-R016 and 8‑channel variants for reliability and feature‑rich firmware. One reported “impressed at their featureset for the price point” and >1‑year uptime with stable MQTT response . Community discussion highlights better performance after using dev version for ESPHome .

Comparison with Competing Products

  • Denkovi 16‑ch Ethernet Relay: Supports SNMP, analog inputs, similar web/API control but lacks MQTT/ESP32 features and is larger.
  • Shelly Pro 4: Certified Zigbee/Z‑Wave, mains-ready, smaller size; single‑purpose relays, pricier (~€100 vs ~$30–90).
  • Lilygo T‑Relay: 8 relays for $20 with external 5 V supply; lacks Ethernet, fewer channels, and smart watchdog features .

Technical Specifications

  • Dimensions: 250 × 107 mm
  • Power: 12 / 24 V DC or AC, ≤2 A/channel, total ~9 W
  • Interfaces: RJ45 Ethernet, Wi‑Fi, RS485, CAN, Wiegand
  • Communication: MQTT, Modbus RTU/TCP, HTTP GET/CGI, TCP/UDP, CoAP
  • OS: ESP32-based with OTA
  • Operating Temperature: –10 °C to 85 °C
  • Inputs/Outputs: 16 digital inputs, 16 relay outputs

Brand or Manufacturer Info
Dingtian (DTWonder) specializes in multi-channel smart relay/control boards targeting both industrial and DIY smart home markets. Their products are well-documented, affordable, and supported through firmware updates. The company provides SDKs and developer resources for custom integration .

Purchase Recommendations
DTWonder：https://www.dtwonder.com/product/dt-r016-ethernet-relay-module/

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