
Pearl Standalone Controller
The Pearl Standalone Controller is a robust solution engineered for seamless integration and ultimate control.
Includes:
- 8 pilot relay outputs
- Built-in sensor support
- I2C Digital Temperature & Humidity Sensor Included
- Weather-resistant enclosure
Key Benefits:
Plug & Play Installation: Includes a wall power plug for fast and simple setup
Integrated Sensor Included: Digital temperature and humidity sensor via I2C
8 Pilot Relay Outputs: Control multiple devices with low-voltage pilot relays
Weather-Resistant Enclosure: IP65-rated with front access window
Retrofit Ready: An excellent upgrade for older control system
$2,450.00
Shipping calculcated at Checkout | *17% surcharge calculated on all hard goods.

Watch how the Pearl Controller Standalone can transform your grow operation!
- Power supply: 24VDC
- Enclosure: IP65 weather-resistant
- Ethernet, USB, Wi-Fi, 4G*
*check for availability - Requirements: Internet, cloud connectivity, cloud subscription, and a power outlet
- 5 isolated Modbus RTU ports
Digital Temperature and Humidity Sensor Via I2C (Included)
| Supply Voltage | 2.4-5.5V |
| Communication | I2C, up to 1 MHz, 2 selectable addresses |
| Temperature accuracy | ±0.3 °C |
| Humidity accuracy | ±2% RH |
| Humidity Range | 0-100% RH |
| Temperature Range | -40 – 125°C |
| Package | 8-Pin DFN, 2.5 x 2.5 x 0.9mm |
| Current Consumption | 2 µA avg, 800 µA measuring |
| Response Time | RH: 86 s, Temp: >2 s |
1. Is this suitable for outdoor use?
2. Can I monitor and control the Pearl Controller remotely?
3. Is this compatible with other equipment?
4. Does the controller provide alarms or notifications if a relay, sensor, or power supply fails?
The controller has a built-in safety feature: if a relay, sensor, or even the power supply fails, it will trigger local alarms (like on-screen alerts or indicators). And if the controller is linked to the Link4 Cloud, it can also send you remote notifications (via email/text/app) so you can troubleshoot the issue quickly without being on-site.
5. If the I2C temperature/humidity sensor gets disconnected or fails, will the controller still operate safely?
If the I2C temperature/humidity sensor stops working or gets unplugged, the Pearl controller won’t shut down. Instead, it will keep running based on the last saved settings, so your system stays stable, and at the same time, it can send an alert or notification so you know there’s a sensor issue to fix.
6. How easy is it to upgrade from my older control system to this one?
The Pearl Standalone Controller is built so you don’t need to start from scratch or rewire everything when replacing an old control system. Since it’s modular, you can connect it to your existing setup with only small adjustments, making the upgrade fast, less costly, and less disruptive.
Link4 Cloud for Web, Android, and iOS
The Link4 Cloud is the latest innovation to Link4’s Cloud technology, supporting the new Pearl controller.
Monitor and set your controllers from anywhere. Create reports, view graphs, and collect data. Log notes using the Grow Journal. Do all of this and more using the intuitive user interface.


















