GR-Connect Wi-Fi Actuator and DC Motor Controller

The GR-Connect is now only available to new commercial users, existing personal users are still supported
Looking to add internet connectivity to your product? Please get in touch to order, and for information on customised versions of the controller and app. 

The GR-Connect control unit and the companion app, free to download for both Android and iOS/Apple devices, provides an easy way of operating electric actuators and other DC (direct current) motors via your smartphone, tablet, or via the website. With this controller you can monitor and control your connected devices from anywhere in the world with an internet connection.

Many different inputs and outputs are available and the GR-Connect can also be set to automatically trigger based on temperature changes (using the temperature sensor probe) or at particular times of the day/week. Please read on below for more information.


The GR-Connect, exclusive to Gimson Robotics, is the first internet connected device designed specifically for the control of DC electric motors and actuators. We have spent a long time developing the controller and the companion app to be as configurable and adaptable as possible, allowing it to be used for many different applications. For example by using the controller you could close a window after having left your house, water your plants from the other side of the world, or automatically regulate your greenhouse or aquarium temperature, just to name a few potential use cases. You can connect brushed electric motors, pumps, winches or actuators rated anywhere between 10V to 36V (including 12V and 24V motors), controlling loads of up to 10A.

Click here to open the above video in YouTube (you'll have a better experience via this link if you're viewing on a phone or tablet). 

Basic Operation

The controller is able to operate with a minimum of just four wired connections, via screw-terminals inside the controller casing (as shown above). Two leads should be connected to a DC (direct current) input supply (positive and negative), and two leads to the DC motor or actuator that you wish to control. Please see section 3.2 (page 6) of the GR-Connect Instruction Manual for more information on these connections. 

The controller has three output states; to operate a motor or actuator in one direction, the opposite direction, or off. The complexity and configurability of operation comes with the controller deciding when and for how long it switches between these states. There are connections on the board (see Instructions section 3.4) for wired control switches, limit switches, and stop switches or sensors, as well as a temperature sensor probe which extends from the controller housing. It is not necessary to use these additional wired inputs, but for many applications it can be useful to have feedback of the device state, for example by using the 'limit switch' signals you could check with a glance of the app whether an actuator-operated hatch were open or closed.

GR-Connect App

The controlling app is also named 'GR-Connect' and has a blue icon. This app enables all of the device features, including remote operation and automatic updates. It is available as a free download for both Android and Apple/iOS devices. 

As we have illustrated to the right, when using the app commands are sent first to our servers and then to the controller itself. This connection relies upon an internet connection for both devices, including a connection to a Wi-Fi router at the controller end. You do not have to have the app open at all times, the device will happily respond automatically to stored thermostats (temperature change triggers) and timers without intervention. Even if the controller's internet access goes down it can still be operated via wired control inputs.

Since the controller and the standard app are connected to the internet we are able to send 'over the air' updates to improve device functionality and options over time, these updates are completely free. For example we eventually hope to update with features such as custom device control groups (for operating multiple controllers simultaneously), and Google Home/Assistant connectivity.

When using the GR-Connect app there is an ongoing cost for us to maintain connected controllers on our servers. The first year of use is completely free while subsequent years are charged at a minimal rate, currently only £12/annum including UK VAT, equivalent to £1/month.

Here are some of the key features of the GR-Connect app:

Direct Control
The app homepage provides a simple and easy way to control the GR-Connect and monitor the state of the controller.
Temperature Recording and Thermostats
When connected to the internet the controller saves temperature data over time which can be viewed in the app. Thermostat events can be set to occur automatically which you can later view on the graph as shown above.
Control Display Options
You can choose how controls appear across the app to suit your application.
Automatic Timers 
You can configure events to occur at set times of day and days of the week. Each event has properties for output and duration and they can also be given custom names. 
Device Selection Menu 
Quickly switch between different GR-Connect controllers on your account (and see controller temperatures and connection statuses at a glance).
Controller Settings
There are many other options detailed in the Instructions Manual (section 8.5). 

GR-Local App

Specialist applications only. A second app version, GR-Local, is available upon request only (as a direct download), and is only compatible with Android devices. This app allows you to connect directly to the receiver's own Wi-Fi network and so may be useful if operating secure lockers or other control/access applications where the user device (phone, tablet) is positioned close to the receiver. For most users the standard app version is the much better choice.

Below is an example of how a GR-Connect controller can be connected to an actuator, in this case a GLA750 model (100mm stroke size). 

Each controller is supplied boxed with: 2pc reset pins (one spare), 3pc connector leads (which are useful if you wish to add limit switches, a wired control switch or a stop sensor), 1pc temperature sensor probe, and a 36 page instruction booklet. 

Controller Specifications                         

Model nameGR-Connect (V1.0) 
Operating voltage 10-36V DC (absolute limits 9V-40V) 
Max. control current 10A at up to 24V, 8A at 24V or more 
Control methodTwo SPST relays, output polarity switching
Operating powerFrom 0.7 to 2.2W (higher when a relay is on)
Operating temperature0°C ~ +45°C (temp sensor probe -50°C ~ 120°C)
On-board fuse
Slow-blow ‘Low profile mini’ / Micro blade fuse, 20A
Dimensions Enclosure 125 x 70 x 40mm, excluding sensor 
Enclosure ABS plastic. With 2pc 5mm mounting holes. 
Weight 220g including temperature sensor 
Suitable wire size At least 1mm2  >105°C rated 
Wi-Fi Module ESP8266EX, with PCB antenna, metal shield 
Protocols / Freq 802.11 b/g/n (HT20)  /  2.4GHz ~ 2.484GHz 

Leads Options    

The controller is normally supplied without input or output leads so that you can connect your own leads via the screw terminals inside the casing. We offer options (via a drop down box at the top of this page) to add either 1m long silicone rubber insulated cables (with bare lead ends), or 260mm long female DC plug leads, to the input and output. If you are planning to buy a linear actuator with a male DC plug fitted and to power it with one of our 12V or 24V power supplies with a male plug on its output, then it would make sense to add the female DC leads option in order to have a complete 'plug and play' set. If you require any custom leads options then please get in touch and we'll let you know what we can do. 

Wired Connections

The diagram below shows how it is possible to connect the controller to a SPDT wired control switch (at the top, to the 3-pin wired input), and to limit switches (at the bottom, to the L1 and L2 inputs).

If you have any questions about this item or about compatibility with other items then please contact us.

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