Development of a Simple Analog-to-digital Converter Using Free-software

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  • SUZUKI Yasutada
    Department of Applied Chemistry, College of Bioscience and Chemistry, Kanazawa Institute of Technology
  • OSHIMA Syunichi
    Department of Applied Chemistry, College of Bioscience and Chemistry, Kanazawa Institute of Technology
  • SAKAMOTO Muneaki
    Department of Applied Chemistry, College of Bioscience and Chemistry, Kanazawa Institute of Technology
  • FUJINAGA Kaoru
    Department of Applied Chemistry, College of Bioscience and Chemistry, Kanazawa Institute of Technology
  • MOTOMIZU Shoji
    Okayama University Incubator

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Other Title
  • フリーソフトウエアを用いる簡易なアナログ—デジタル変換器の開発
  • フリーソフトウエアを用いる簡易なアナログ-デジタル変換器の開発
  • フリー ソフトウエア オ モチイル カンイ ナ アナログ-デジタル ヘンカンキ ノ カイハツ

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Abstract

<p>We have developed a simple analog-to-digital converter (ADC) by using free software such as computer-aided design (CAD) software for an electronic circuit, a filter circuit simulator, an integrated-developing environment (IDE) for programming a controller, and that for a PC to acquire and display the data. The ADC can record a temporal signal produced by chromatography and flow-injection analysis. It has two voltage measurement ranges: ±2.048 V and ±1.024 V, respectively, with 14-bit resolution and a four samples s−1 sampling rate. The voltage resolution is 0.25 mV and 0.125 mV per one ADC reading for ±2.048 V and ±1.024 V, respectively. Its dimensions were 100 × 70 × 30 mm, and mass was 110 g. We have evaluated its performance, including the linearity and the difference between the two devices. For ±1.024 V range, the calibration curve for one ADC and another was D = 7954V - 5 and D = 7946V + 30, respectively, where D is an ADC reading, and V is an input voltage. For another range, it was D = 3972V - 3 and D = 3968V + 15, respectively. Their slopes and intercept agreed with each other, and had good linearity, R2 > 0.9999. We have then successfully applied it to the sequential injection analysis (SIA) of chromium(VI) using diphenylcarbazide as a coloring reagent. The circuit diagram and programs developed in this paper are available on our website.</p>

Journal

  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 70 (12), 737-743, 2021-12-05

    The Japan Society for Analytical Chemistry

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