This is a project I`ve done on behalf of a person on an internet forum. The requested operation is simple: Use an EasyDriver stepper motor driver and a 1. 8 deg/rotation stepper motor and make the motor turn one revolution per minute. This frees me up a bit not having to select and source products myself, nor having to implement the actual stepper
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driver myself. The EasyDriver is REALLY simple in operation. Connect 7-30v DC to M+ (and ground to GND), connect a stepper motor to A and B and the motor automatically steps once for each LOW->HIGH transition on STEP. The direction is dependent on the state of DIR (+5v or ground). MS1 and MS2 together defines the step resolution. The driver chip is a Allegro A3967SLB, so the truth table for MS pins can be found in it`s datasheet, page 2. The breakout board has pull-up resistors on both MS1 and MS2, which puts it in eight-step resolution as standard. To alter MS1 and MS2 you simply pull them to ground individually based on your desired resolution. I decided to make a few improvements to the requested operation. Via a DIP-switch the user can select the resolution for the EasyDriver while simultaneously altering the steps/minute so it will always make one turn per minute even though the step resolution is changed. There is also an LED to indicate each step. I used a four-way DIP switch, the two remaining switches I used for step direction and to simply turn the steps on or off. The DIR signal is pulled up to +5v by a 10k resistor My circuit is built on a strip board and is based on an AtTiny25. It`s system clock is driven by a low frequency 32. 768kHz watch crystal. It`s important to program the correct fuse bits for low frequency crystal oscillators! On to the code. I`m using Timer 0 with system clock as clock source in...
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....
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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....
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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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