In this tutorial, we are making a circuit of a Simple magnetic pulse counter using a hall effect sensor. This circuit is simple and easy to make as it uses only a few numbers of components such as a hall sensor, optocoupler, resistor, and calculator.
The purpose of this circuit is to count the speed of the motor or count any type of magnetic pulse. A hall sensor is used for sensing purposes, it is a sensor that senses and measures the magnitude of the magnetic field around it. Its voltage is directly proportional to the intensity of the magnetic field. The other important component of this circuit is a photocoupler, it is responsible for passing electrical signals between two isolated circuits with the help of light.
Hardware Components
The following components are required to make Magnetic Pulse Counter Circuit
| S.no | Component | Value | Qty |
|---|---|---|---|
| 1. | Input Supply DC | 5-12V | 1 |
| 2. | Hall effect sensor | US1881 | 1 |
| 3. | Photocoupler | PC817 | 1 |
| 4. | Calculator | – | 1 |
| 5. | Resistor | 1KΩ | 1 |
PC817 Pinout
For a detailed description of pinout, dimension features, and specifications download the datasheet of PC817
US1881 Pinout
For a detailed description of pinout, dimension features, and specifications download the datasheet of US1881
Magnetic Pulse Counter Circuit
Working Explanation
This circuit can be operated at 5 to 12 volts DC, any kind of battery or power supply can be used. The working of this circuit is very simple. When the hall effect sensor senses a moving magnet, its voltage will increase with the increasing intensity of the magnetic field around it. So, it will send pulses from its OUT gate which is an input signal for the PC817 photocoupler. Now, these output pulses will be received by the photocoupler and sent to the calculator. The calculator will count them and display the count.
After building this circuit you will have to activate the counting mode by adjusting the counting. For that, you have to press 0+1 on your calculator and after this, the calculator will be ready for counting the pulses received from the optocoupler.
