The spider prop is fairly simple in terms of mechanical setup. Where it gets somewhat complicated is in the electronics setup. It is based around a stepper motor. By their very nature, stepper motors are non-trivial to control. By that, I mean that you can`t just apply power and expect them to turn. They need a controller of some type, such as a
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computer or a microcontroller. However, the advantage of a stepper motor is that the controller has a very high degree of control over the position of the motor`s shaft. By keeping track of the number of steps executed, the controller knows exactly how far the spider has been unwound, and so it knows exactly how many steps it needs to execute in the other direction to wind it back up. As I mentioned earlier, the mechanical set up is pretty basic. Attach a couple of L-brackets to the motor, and attach the motor to a small sheet of plywood. Drill a hole about the size of the motor shaft into the end of a dowel that is three inches long or so. The diameter of the dowel is up to you. The thicker the dowel, the faster the spider will wind and unwind. Glue the dowel onto the motor shaft. Drill a hole in the piece of plywood the motor is attached to. The hole should be directly under the dowel attached to the motor shaft. Run a string through the hole and attach it to the dowel. I stuck a thumbtack into the dowel and tied the string to that. Tie the other end of the string to the spider, or whatever else you want to go up and down. Now, for the electronics side. The stepper motor I use has 6 leads. Two of them are to supply power to the four coils within the motor. Each of the other four leads is connected to one of the four coils. By connecting each of the four leads to ground, one at a time, in the proper order, the motor shaft...
This project fits more for custom made battery casing that can have more space to hide things inside. This switch with few alterations can be used for any other project as well but is designed based on e-bike needs! This project use a clever functionality of....
The circuit described here uses ultrasonic oscillations and operates based on the propagation velocity of these oscillations in the air. Thus, we can easily determine the distance of two points if the time within which the wave travels this distance is....
Sometimes the precious metals are hidden too deep and are not detected except with complicated devices. In many cases, however, small pieces of precious metal buried near the surface can be detected by relatively simple means. Everyone is very attractive to....
Many times for various reasons we forget or can not water the plants that we have in our homes. And many humidity sensors units just notify us with a beeping sound or with a flashing light, that the pot needs watering. But what if we are away from home? This....
The principle behind a metal detector is really very simple. Proof of this is the circuit that follows, in which it proves that the construction of a metal detector can be done in the minute, with few components that we find very easily everywhere. With the....
The sub-harmonic bass generator is a sound producing unit for guitars. The sound it produces looks very much like that of the bass guitar. The octave generator is sometimes quite unusual since it does not produce any of the usual ways of coloring the sound,....
In the past the sounding (sea bottom measurement) was done with the "bullet", that is, with a heavy lead object that the seamen plucked into the sea hung from a calibrated rope. As soon as the "bullet" reached the bottom, the depth appeared directly from the....
This Amplifier was designed to have the following specifications: Distortion less than 0.1% at full power of 100W even at 20KHz. Power has to be attributed to an extended bandwidth. The output transistors must be protected against short circuits. The power....
A series of LEDs serve to alert the gardener when plants need water. Using two conventional digital integrated LEDs and a series of LEDs, we make a very useful device for gardening. The device detects the amount of water in the pot and alerts the grower.....
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