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| Counter Sensor 4 Digit |
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| The counter sensor majority apply in industry or factory. Example counting commodity or counting a car in/out of parking. This project we will create counter system for apply. First of all see feature as below. |
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Feature  |
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Display 4 Digit 0000-9999
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Can be Count UP or Count DOWN
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Hardware |
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| This counter Sensor consist of 3 Section as follows 1.Detect Object (Sensor) Data Processing (CPU) and Display for sensor final section Display by 7-Segment. |
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| 1.Detect Object (Sensor) : we choose Optical Sensor H21A1 (Phototransistor Optical Interrupter Switch). |
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| 2.Data Processing (CPU) : for this project we choose microcontroller AT89C1051 of ATMEL Product |
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| 3.Display : for final section Display by 7-Segment. |
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The completed circuit show as figure 1 |
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Figure 1. Schematics of Counter Sensor 4 Digit |
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Software |
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| The Programming can be explain by flowchart figure 2 |
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Figure 2. Flowchart for Programming |
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| Data Support |
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