H-bridge is frequently used to control DC motors and stepper motors. When controlling a bipolar stepper motor, two full H-bridges are needed. There are many H-bridge ICs (like L298, MPC17529 and SN754410 which is a quad half H-bridge) for just that purpose. But if you are on a budget, you may want to consider building a dual H-bridge yourself. The following schematic shows a simple dual H-bridge
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using eight general purpose transistors ( 2N3904 and 2N3906 ). Given the maximum Iceo of roughly 200mA, this circuit can be used to drive a small bipolar stepper motor operating between 5V and 12V, such as the stepper motors found in most floppy drives and CD/DVD drives. The four control inputs (1, 2, 3, 4) can be driven with Arduino s digital pins (i. e. 2, 3, 4, 5) directly. The following program illustrates how to signal the four leads of a bipolar stepper motor for it to rotate. Of course, there`s already a stepper motor library built for this purpose. The program below is helpful when learning the sequence of the pulses required by bipolar stepper motors. int coila1 = 2; int coila2 = 3; int coilb1 = 4; int coilb2 = 5; void setup() { pinMode(coila1, OUTPUT); pinMode(coila2, OUTPUT); pinMode(coilb1, OUTPUT); pinMode(coilb2, OUTPUT); } void loop() { digitalWrite(coila1, HIGH); digitalWrite(coila2, LOW); digitalWrite(coilb1, LOW); digitalWrite(coilb2, LOW); delay(10); digitalWrite(coila1, LOW); digitalWrite(coila2, LOW); digitalWrite(coilb1, HIGH); digitalWrite(coilb2, LOW); delay(01); digitalWrite(coila1, LOW); digitalWrite(coila2, HIGH); digitalWrite(coilb1, LOW); digitalWrite(coilb2, LOW); delay(10); digitalWrite(coila1, LOW); digitalWrite(coila2, LOW); digitalWrite(coilb1, LOW); digitalWrite(coilb2, HIGH); delay(10); } Here is a picture of an Arduino controlled CD-ROM stepper motor (the one controlling the tray...
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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