Version 1.0 | June 2025 | Powered by ThingsLinker
The Tarangify T-LORA-RN-01 is a versatile relay node development board engineered for remote switching, IoT automation, and long-range wireless control.
Built around the reliable RAK3172 LoRaWAN module, it combines ultra-low power design with up to 15 km line-of-sight communication.
Equipped with four independent relays for controlling AC/DC loads, an onboard AHT20 temperature & humidity sensor, and flexible power options — either battery-powered or directly from 240 V AC via an integrated mini SMPS — it’s ideal for smart agriculture, industrial automation, remote pump/valve control, and other wireless control systems.
Technical Specifications
| Category | Specification |
|---|---|
| Microcontroller | RAK3172 module with STM32WLE5 MCU |
| Communication | LoRaWAN EU868 / IN865 / RU864; also supports LoRa P2P |
| Relay Outputs | 4 × SPDT mechanical 5 V relays (up to 250 V AC @ 7.5 A or 14 V DC @ 7 A each) |
| Sensor | AHT20 (Temperature: −40 °C ~ +85 °C, Humidity: 0–100 % RH) |
| Power Supply | – Onboard mini SMPS: 240 V AC → 5 V DC – Battery: Li-ion / LiFePO₄ supported |
| Interfaces | – I2C header (5 mm pitch) – UART1 header – TTL serial via USB-C – Extra GPIOs |
| Logic Level | 3.3 V internally regulated |
| Current Consumption | – Deep sleep: ~2–5 mA – Active TX: ~250–350 mA |
| Indicators | Relay status LEDs, LoRa TX/RX LEDs |
| Mounting | M3 mounting holes |
| Dimensions | 85.82 mm × 112.42 mm |
| Firmware Support | Arduino IDE (RUI3), STM32Cube, LoRaWAN compatible |
Power & Interfaces
- Battery support: LiFePO₄, LiPo, Li-ion (3S)
- Optional DC input: 5 V ~ 40 V (using Tarangify DC–DC buck converter)
- Relays controlled by: IO1, IO8, IO9, IO15 (RAK3172 GPIOs)
- Extra GPIOs exposed: PB5, PA0, PB2, PA10
- I2C: shared with onboard AHT20 and available for external sensors
- UART1: screw terminal for serial communication
- Status LED: PB4
Workflow Example
The T-LORA-RN-01 can function as:
- LoRaWAN end-device: communicates with a gateway & cloud
- LoRa P2P node: direct device-to-device control without the internet
Example:
A solar-powered sensor node measures field moisture and wirelessly signals this relay node to activate irrigation pumps — enabling fully off-grid automation.
Applications
- Smart agriculture: irrigation, pump & valve control
- Industrial IoT: remote machine & process automation
- Smart cities: street lighting, remote switching
- Environmental monitoring: temperature & humidity tracking
- Remote sensing: operate loads in isolated locations without network infrastructure
Environmental Ratings
| Parameter | Value |
|---|---|
| Operating Temp. | −20 °C ~ +85 °C |
| Storage Temp. | −20 °C ~ +75 °C |
| Humidity | 10 % to 90 % RH |
| Cooling | Natural convection |
Ordering Information
| Product Code | Description | Color |
|---|---|---|
| T-LORA-RN-01 | LoRa Relay Node Development Board | Green |
Mechanical Drawing
Dimensions: 85.82 mm × 112.42 mm
- Pin pitch error ±8 %
- Pin length error ±1 mm
- Pin diameter error −0.2 mm
All dimensions in mm.
Node PCB Highlights
- Built-in RAK3172 LoRa module
- 4-channel relays
- Onboard AHT20 temperature & humidity sensor
- I2C header for extra sensors
- TTL serial for programming/debugging
- Reset button, boot header, and extra GPIO pins
- RGB LED for relay status and LoRa activity
- Battery terminals & optional DC input
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