Setting up your Growlink Nutrient Controller
Growlink SW-1 Nutrient Controller Quick Start Guide
2.4 GHz capable router
Channels 1 – 11
On a broadcasted SSID network
Not behind a firewall of Enterprise network
Note: We do not recommend using WEP Wi-Fi settings, for security reasons.
Professional installation is recommended for large indoor grows and greenhouse installations.
Questions? Visit http://growlink.com/support or call 800-432-0160.
1 x Growlink Controller
1 x Quick Start Guide
1 x Power Adapter
1 x Mounting Hardware Kit
2 x Antennas
1 x pH Probe
1 x TDS Probe w/Temp Probe
2 x Float Level Switch
1 x pH Calibration Solution
1 x TDS Calibration Solution
Drill and a drill bit set
#2 Philips screwdriver
3/32” or similar small flat blade screwdriver
Before You Begin
To set up and configure your Controller, you must have a working Wi-Fi network with an internet connection. If you have a very busy network, such as one with multiple video cameras, we recommend using a dedicated wireless access point for the Growlink system.
Step 1 - Installation
Use the enclosed mounting hardware to mount it to any flat surface. If you're mounting on to drywall, level the controller at your mounting location on the wall. Using the two holes on the flange of the controller as a template mark the holes with a pencil. Remove the controller and set in a safe spot. Use a drill bit that will make a hole the same size as the provided anchors. Drill two holes on the pencil marks. Insert the anchors into the holes. Align the controller back up with these holes. Drive the provided screws in to the anchors with a #2 Philips screwdriver.
If you're mounting on to wood, metal or other surfaces, level the controller at your mounting location. Mark two holes with a pencil using the controller flange as the template. Remove the controller. Use a drill bit the same diameter as the shaft of the provided screws and drill holes at your pencil marks. Realign the controller and drive the screws in to the holes with a #2 Philips screwdriver.
Use the included power cable to plug in the Controller. The first time it turns on, it will have a flashing blue light to indicate that it has power and is ready to be connected to a Wi-Fi network.
Step 2 - Attach the pH Probe
Unscrew the cap on the end of your pH Probe right before inserting the probe into your grow system. Do not leave this probe exposed to open air for long, otherwise the membrane will dry out and the probe will be unsuable. Connect the female BNC adapter to the center male BNC port on the controller labeled "pH".
Step 3 - Attach the EC/TDS Probe
Unscrew and remove the cap on the end of your EC Probe. Remove the cap right before inserting into your grow system to prevent damage to the electrodes on the tip. However, this probe is not affected by being exposed to open air. Connect the female BNC adapter to the right male BNC port on the controller labeled "EC".
Step 4 - Attach the Temperature Probe
The two leads included on the EC Probe are for a built in Temperature Probe. Insert the leads into the two terminals on the right labeled "Temp Probe". Using a small jeweler's flat blade screwdriver, tighten the terminal screws and pull on both wires lightly to insure they're held in place. Polarity does not matter for these wires even though the terminals are marked as + and - so you can put either wire in either terminal.
Step 5 (Optional) - Attach the Float Switches (For Applications with a Reservoir)
When drilling a hole for the float sensor, we recommend starting with a 5/8" hole. Insert the two leads from the first float switch into the terminal labeled "Switch 1". Using the same flat blade screwdriver as before, tighten the terminal screws on both wires and tug on them to make sure there's a solid connection. Repeat for "Switch 2". Switch 1 should be mounted at the bottom of the reservoir and Switch 2 at the top or at whatever level you want the tank level to read "LOW" on the Growlink dashboard.
Important: Both float switches should be installed in the reservoir as pictured below. When the tank is empty the switch rests at a horizontal position and when submerged in water it is able to float UPWARDS to a near 90 degree angle. This is the only configuration that allows the switches to communicate properly with your controller.
If you're installing float switches on an EC6 expansion board, view the float sensor instructions here: Float Sensors on EC6 Expansion
Step 6 - Download the Growlink App
Step 7 - Launch App
Launch the App and follow the onscreen instructions to connect to your Controller and configure its Wi-Fi.
Getting to Know your Growlink System
Your Growlink Dashboard shows all real-time readings from the sensors connected to your system.
The Devices tab shows you the current status of any device connected to your system. “A” indicates the device is in Auto Mode. It is green if the device is turned on because on an active rule and red if it is off. You can also override the device either on or off.
Breathing Green - Your Controller is connected to the internet. When it is in this mode, you can call functions via the App.
Blinking Green - The Controller is trying to connect to the internet. If it continues to blink for several seconds, make sure that your internet service is working, then try resetting your Controller.
Blinking Blue - The Controller is in Listening Mode; it is waiting for your input to connect to Wi-Fi. This is the mode it comes in from the factory.
Flashing Purple - The Controller is updating its firmware. It will return to normal operation within a couple minutes.
After the initial setup, if you want to change the Controller’s Wi-Fi settings, press and hold the Setup button for approximately 15 seconds until the light flashes blue rapidly. (The Setup button is the Bottom button.) Release the Setup button and the light will start blinking blue. The Controller is back in Listening Mode. From the App, go to Settings > Connect to Controller to reconfigure your Controller.
Sensor - Sensors monitor the environment and provide back data. The Environment Sensor Module includes Temperature, Humidity, CO2 and Light. The Nutrient Controller includes pH, conductivity, reservoir temperature and reservoir level sensors.
Module - These are the physical units that make up the Growlink ecosystem. The Environment Controller, Environment Sensor Module, Nutrient Controller and Power Links are examples of modules.
Device - A device is an external device that is controlled by a Growlink Controller. Devices connect via Power Links, Remote Pro Relay Boards, or onboard I/O ports (depending on your model). Examples of devices are fans, lights, pumps, and humidifiers.
Need more help? You can troubleshoot an issue directly from the help center at