The purpose of this project was to develop a stepper motor driver for 2-phase unipolar stepper motors that has built in current control. The eventual target project for this driver is for my CNC milling machine that I am currently planning out. This needs a few elements that are combined to provide a full driver. Once this is established the curre
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nt being supplied to the motor coils needs to be limitted in some way to stop melting anything. The obvious option here is to use a chopper circuit. Finally an intelligent controller is required to provide the correct number of steps for a required distance of travel. Many simply use a PC parallel port for this on CNC projects but I want this to be more of a stand-alone driver that can be used for other things. Ideally I will include ethernet control so that I can run the CNC machine remotely from the comfort of my living room instead of the cold garage and negates the need for a dedicated control PC. The device is based around an L297 driver IC that performs the translation step (ie takes clock and direction input and generates the correct output sequence for driving the stepper) and has current limitting abilities. Additional logic and driver circuitry is then added to drive the motor coils. Each motor driver is fully independant of the other drives and is controlled with its own clock and direction signals, has a seperate current limitter setting and should not interfere with each other. In reaching this final solution I went through many designs, some of my own, some through various searches on the net. The final design is a combination of a few of the most common designs that can be found on the internet. One useful site I used is there are some good designs of stepper drivers and also a bulletin board where people...
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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