Particularly for use in theatrical stage props to open/shut a prop curtain. ) I'm having trouble visualizing how they can open, because the bulldog clips seem like they would be great in one direction, but lose tension going other way? I wondered too if you have considered something like a set of magnet reed switches mounted to act as limit switches to indicate the full open and full close positions, such that you wouldn't need to change the rotation count for each different sized blind that you install it on in a house? Also, what's a good way to measure the strain on the motor such that if you trigger a close event, particularly based on time or light level but aren't present in the room and the drape hangs up on something? Like your sleeping annoyed cat? Is there a sensor or value one could read to cut it off if it's held back? I'm loving this idea and want to try it out. Not the first time I have seen videos mentioned in an instructable's comments that I can't seem to locate. Can you post a crude diagram of the way you set out the fishing line thing? Or help me understand where I scan see the video discussed? (I'll check the site's info on video shortly. Very very cool and fun concept! I'm new to being able to comment but have lurked here a while. Do you think it would be easy to add onto or modify this in such a way that it can connect to wifi and IFTTT? Is the clock part you've added supposed to let you set it to open and close at certain times of day while you're not around to Bluetooth-control it? Today I found a crowd-backing page for something like this called Slide, but at $85 apiece I would love to take on the challenge of learning to do electronics and a bit of coding if I can find a local friend to work with me on it that actually has a bit of experience in those areas (all I can do is basic HTML and super-basic home repairs!) Thank you for providing the directions, pictures, links to parts, etc. This looks so amazing! I was saying a while back that I need something like this, and surely it's possible to build one? My apartment windows only face east, so I'd really like to be able to program the curtains to switch positions in the middle of the day - either keep out morning light then let in less-hot afternoon light in summer, or let in warm morning sun then insulate to hold in the warmth on winter afternoons. Reverse the motor and they come towards each other, closing the blinds. When you spin the motor one direction, the binder clips will go away from each other, opening the curtains. In the drawing, with the binder clips in the middle, this is the curtains closed. UPDATE: I have added a picture/diagram of how I wrapped the fishing line with the binder clips. To attach the curtains, I took some binder clips and clipped them to the curtains, after seeing where those clips met the line, I tied them off to opposite sides of the line, so they go in opposite directions. ![]() I then wrapped this loop multiple times around the stepper motor pulley, until the line was tight. I could then tie the two ends of the line together to make a loop. I put one wrap around the idler pulley and pulled the other end to the pulley on the stepper motor. I switched to standard fishing line that can stretch pretty easily. I started by using a high strength, low stretch type of line but realized that have no play was not going to be a good idea. NOTE: Not all stepper motors will have the same color pinout!Ĭonnecting the fishing line was the hardest part of this project. Stepper driver 2B -> stepper motor GREEN wire Stepper driver 2A -> stepper motor YELLOW wire Stepper driver 1A -> stepper motor RED wire Stepper driver 1B -> stepper motor GRAY wire Power Supply V-> Arduino GND -> stepper driver GND pins -> bluetooth GNDĪrduino +5V -> stepper driver VDD -> bluetooth VCC ![]() Power Supply V+ -> Arduino Vin -> stepper driver VMOT pin On the wires that I actually put through a hole, I created a solder bridge between it and whatever pin it was being connected to.Īrduino D12 -> stepper driver DIRECTION pin I intentionally didn't cut the long leads of the components so that I could use them to solder to. ![]() Once the main components were in place it was time to start wiring them all together. Once I had the components where I wanted them, I stuck the PCB in the vise and got to soldering.
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