1. Introduction
This implementation can be seen as a simple extension of the RUC Lighting, adding another Zigbee cluster in the Home automation aspect.
Test and verify various functionality and ensure proper functioning.
| RUC Window Covering |
|---|
2. Zigbee Implementation
The Zigbee cluster Window Covering [1] is used for this example.
| Window Covering cluster usage |
|---|
2.1. Server cluster side
The server is based on a STM32WB5MM-DK [2], which has a slot to put an Arduino board to expand its functionality.
| STM32WB5MM-DK |
|---|
It uses an Arduino Motor Shield Control (AMS) [3] based on the ST dual full-bridge driver L298P [4] to drive a DC motor, enabling the real opening and closing of a window covering.
| Arduino Motor Shield |
|---|
One driver was created to enable the following functionalities:
- Adjust the motor’s speed by modifying the duty cycle of a PWM (driven by a GPIO connected to a timer).
- Change the rotation direction (driven by a GPIO).
- Set a break (also driven by a GPIO)
- Current sensing, with that possibility, this feature detects when the window covering is stuck and stops the motor.
2.2. Client cluster side
The client is based on a P-NUCLEO-WB55 [5]
| P-NUCLEO-WB55 |
|---|
The client cluster of the window covering implements 7 commands but only three commands are used.
- Up / Open
- Down / Close
- Stop
As with the previous example, theses commands are associated with callbacks functions on the server side. When a UP comand is sent, the corresponding callback function on the server side, initiating the motor rotation to open the window covering.
2.3. Binding and Report process
This example reuse the same process of Zigbee RUC Lighting.
For more information please visit it.
2.4. Extension possible
A potential extension is to add the Alarms cluster [6] to notify when the shutter is blocking and flash the LEDs controller to warn User.
To better understood a first approach implemented, please find below a process used.
3. Acronyms and definitions
| Term | Definition |
|---|---|
| ZC | Zigbee Coordinator |
| ZR | Zigbee Router |
| ZED | Zigbee End Device |
| RUC | Realistic Use Case |
| AMS | Arduino Motor Shield |
| GPIO | General Purpose Input Output |
| PWM | Pulse Width Modulation |