As I delve into the world of smart home automation, one of the most exciting projects I’ve undertaken is integrating my spa system with my home automation setup. My spa, which is branded as Avenli but also sold under other names, has a display/controller that connects to the pump and heater via three wires labeled GND, HX, and +5V. This setup has presented me with a couple of intriguing options for automation, and I thought I’d share my journey and insights with the community.Option 1: Hacking the Control InterfaceMy first thought was to see if I could hack the control interface between the display and the pump. This would allow me to potentially integrate the spa’s controls directly into my smart home ecosystem. I started by examining the wiring and the communication protocols used. While I’m not an expert in reverse engineering, I found some resources online that suggested using a logic analyzer to capture the communication between the display and the pump. This approach seemed promising, but it also felt a bit daunting for someone at my skill level.Option 2: Wiring Switches with ESPHomeThe second option I considered was wiring the relevant switches and using an ESPHome device to trigger them as needed. This method seemed more manageable and less invasive. I envisioned creating a setup where I could control the heater, filter, and even the bubble jets remotely through my smartphone or voice commands. To make this work, I would need to identify the specific switches and leds on the spa’s control board. From what I could see, there were up to three leds and five switches involved, which would require careful wiring and programming.Monitoring LEDs and Controlling FunctionsOne aspect I was particularly excited about was the idea of monitoring the LEDs. These LEDs could provide valuable feedback on the spa’s current state, such as whether the heater was on, the filter was running, or the bubbles were active. By integrating this feedback into my home automation system, I could create a more seamless and interactive experience. For example, I could set up notifications when the spa was ready or automate certain functions based on my schedule.Challenges and LearningOf course, this project hasn’t been without its challenges. One hurdle I faced was ensuring that the ESPHome device could reliably trigger the spa’s switches without causing any unintended behavior. I spent quite a bit of time testing different configurations and ensuring that the communication between the ESPHome device and the spa’s control board was stable. Another challenge was interpreting the data from the LEDs and translating that into meaningful information within my automation system.Tips and TricksFor anyone looking to undertake a similar project, here are a few tips I’ve learned along the way:1. Start Small: Begin by testing individual components before attempting to integrate the entire system. This approach helps identify potential issues early on.2. Document Everything: Keep detailed records of your wiring, configurations, and any modifications you make. This documentation will be invaluable for troubleshooting and future reference.3. Leverage Community Resources: Don’t hesitate to reach out to forums and communities like this one for advice and support. There’s a wealth of knowledge and experience shared by fellow enthusiasts.Looking AheadWhile I’m still in the process of fine-tuning my setup, I’m already seeing the benefits of integrating my spa into my smart home. The ability to control and monitor my spa remotely has added a new level of convenience and enjoyment to my smart home experience. I’m excited to continue refining this project and exploring new ways to enhance my automation setup.If anyone has experience with similar projects or has advice on how to improve my setup, I’d love to hear from you! Let’s continue to learn and grow together in the world of smart home automation.