Hey guys. This is my first post here. Yes, I have looked over similar topics as this. Of course the scope and objective is a bit unique when compared to some of hte existing topics. I currently have a rasberry pi running an openhabian server. It controls 9 blinds tilt servos. These are all kits from MKSmarthouse. He makes great stuff!
There are three blinds in my house that my wife wants lifted and not just tilted open. These blinds are all on the 2.5" blinds frame platform. I have a 38kgcm servo spec'd. With a 27:1 worm gear I want to lift the blinds that require a 25lb force to lift. I want to place an ES8266 in the blinds frame and use a relay with external power supply to provide the lift servo with 7.4V. The 3.3V output from the ESP8266 would open the relay to give the 7.4V to the servo. Signal goes back to the ESP8266 direct. I think I should have a reed switch at the top (open) and bottom (closed) positions as inputs back to the ESP8266. The servo would receive power each morning to lift until the open reed switch was made. At night at a set time openhabian would send out the "close" signal via wifi and the servo would get power to rotate in the other direction until the "closed" reed switch was made.
The purpose of the project is to manage blinds lift in a compact, nearly invisible package that is internal to the blinds frame. I have seen others tackle the blinds lift issue, but the solution is always messy with pulleys , ropes, big gear boxes, etc. mounted in and around the blind and window. My concept has two small reed switches mounted on the window frame and one or two power source cords ran up tight on the outside of the window trim. I currently use small command hooks to keep the tilt servos' power source cords tight to the trim, and you can't even tell they're there. I also want the solution to integrate with my openhabian (raspberry pi) server. The blinds that will be lifted will get a command to open prior to being told to lift (open) or lower (close). This means there will be two servos, and it'd be nice to eliminate the existing MKSmarthouse PCB in the blind and power only one board. The benefit here is there are less wires and less components in these blinds.
To start with; I am looking for an ESP8266/relay combination to power the ESP8266 and servo- which requires 7.4V for peak torque while the ESP8266 can only handle 3.3V. A combination with two relays for each of the servos listed above would be preferred. Is this a good solution? Will this relay hold up to 7.4V? It's a SRD-05VDC-SL-C. Will I need the SRD-09VDC-SL-C to hold up to the 7.4V? If so, can anyone link me to an ESP8266/9VDC relay module that's available for purchase off the shelf because I'm not finding it.
Thanks in advance for the help.