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Relay ControllerVersion 1.0.9 - August 2023
Relay Controller is an app that allows you to control a USB HID relay board (x1, x2, x4 and x8 switches) that is connected to a USB port on your Windows PC, laptop or tablet. This will then allow you to switch the power to connected equipment (e.g. lights, fans, motors, etc) on and off over a timed schedule. IMPORTANT: The Relay Controller app only supports USB HID compliant relay boards that can be programmed by third party apps. When plugged in, these boards are automatically recognized by Windows as a USB device and they do not require any drivers to be installed. IMPORTANT: When purchasing a board to use with the Relay Controller app, please make sure that the supplier states that their boards can be controlled by the usb_relay_device DLL / development library. Click here for a supplier of compatible USB HID relay boards and read the product description where it clearly states that the boards can be controlled by a development library (or DLL). 
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The app can alter the on/off state of each of the relay switches when the following combinations of conditions (triggers) are met:
You can also:
Video demonstration of the Relay Controller app
- immediately OR...
- specific times of day
- specific days of the week, single days or all days
- specific dates of the year.
You can also:
- add a sequence of commands for each switch that will occur during each trigger event in order to provide combinations of switch on, off, delay and repeat command sequences.
- assign a keyboard key to each switch to allow you to turn the switches on and off at any time by pressing the keys on the keyboard.
- run the app from a batch file or by process launching from other apps
Video demonstration of the Relay Controller app
Note that the app will work in Evaluation Mode until you buy a Product Code. In Evaluation Mode the app is fully functional to allow you to test it, but a message box will appear at random times. This will pause the app until you click on the message box to remove it.
Please note that since recording the tutorial video (above), the Relay Controller app has been developed further and it now has additional features that are not shown in the video. The Release notes below provide a list of the new features and you can find information on how to use all the features in the User Guide PDF which is available from the 'Help' button in the app itself.
Relay Controller - Release Notes
1.0.9 - 29/8/23
1.0.9 - 29/8/23
- Prevent crash in certain schedules
- Fix: Allow 'Single Trigger' schedule files to run from the command line
- Add the Switch panels feature
- Poll for a relay board connection in a background thread
- Add On/Off and Toggle option to the 'Switch keys' feature
- Add the 'Switch state' display
- Add the Watchdog feature
- Add the Keyboard hook feature
- Fix: Prevent the app crashing if a board is not connected and the app is trying to issue a switch command
- Add support for more USB HID relay boards
- Added the feature for running a Single Trigger Schedule File as a Command Line parameter. This will cause the Relay Controller to load and run the schedule, then close immediately after the schedule has completed. This is useful when you want to control the relay switches from the Windows command line or from other applications.
- Added the 'Switch Toggle Keys' feature
- First release
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