After being inspired by @jetpuf’s implementation using the ESP8266, I embarked on a journey to create a solar-powered automated blind system that would not only be energy-efficient but also completely wireless. The challenge was to design a system that could run on batteries and be recharged using a small, discrete solar panel. Here’s how I achieved it!
The Design
The core of my solution is a central ‘hub’ that stays connected to the WiFi network. This hub communicates with the blinds via a 915Mhz RF module. The blinds themselves are in a low-power sleep mode most of the time, waking up only when they receive a command from the hub. This approach drastically reduces power consumption.
Key Components:
- Hub: Built using a WeMos D1 Mini with an RF shield (RFM69W) to handle communication.
- Blind Controller: Uses a Moteino from lowpowerlab.com, which includes an RFM69W module. The Moteino is integrated into a custom circuit board that manages battery charging, servo control, and manual switch inputs.
- Solar Panel: A compact 5V 200mA panel ensures the system stays powered even during extended periods of use.
Features
- Fully Self-Contained: No need for wired power sources.
- Precision Control: Capable of moving to 180 different set points.
- Customizable Positions: Set custom open and close positions.
- Manual Override: Manually open or close the blinds at any time.
- Group and All Commands: Control multiple blinds or all blinds simultaneously.
- Long Battery Life: Theoretical battery life of 8.9 years on a 2200mAh LiPo battery.
- Solar Charging: Quickly charges the battery with the included solar panel.
- Status Reporting: Monitors battery voltage, charging status, and more.
Implementation
The system is designed to be easily integrated into existing blinds. The custom circuit board fits neatly into the blind’s mechanism, and the solar panel can be mounted discreetly. The entire setup is controlled through a SmartThings interface, making it accessible from any smartphone.
Why This Matters
This project isn’t just about convenience; it’s about sustainability. By harnessing solar power and minimizing energy consumption, this system offers a green alternative for home automation. Plus, the ability to control blinds remotely can significantly improve energy efficiency by managing natural light.
Final Thoughts
While the development process was challenging, especially in optimizing power consumption and ensuring reliable communication, the result is a robust and user-friendly system. I encourage anyone interested in DIY home automation to consider similar projects. It’s a rewarding way to enhance your living space while pushing the boundaries of what’s possible with technology!
For those interested in replicating this project, I’ve made my custom Moteino shield available on Tindie. Check it out and let me know if you have any questions or suggestions!