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Development of an ESP32 Microcontroller-based Colorimeter with an Android App for the Verification of Roasting Degree of Coffee Beans


Paper Type 
Contributed Paper
Title 
Development of an ESP32 Microcontroller-based Colorimeter with an Android App for the Verification of Roasting Degree of Coffee Beans
Author 
Prathan Comejina, Miki Kanna and Sarawut Somnam
Email 
sarawut_som@cmru.ac.th
Abstract:

     A low-cost and portable colorimeter was developed using an ESP32 microcontroller and a TCS34725 color sensor to monitor the degree of coffee roast, crucial for maintaining flavor consistency and controlling product quality across different batches. The colorimeter detected color recognition resulting in RGB color intensity values, which could be displayed on the device’s TFT LCD touchscreen. Additionally, colorimetric data was transmitted in real-time via WiFi and stored in a MySQL database using an Android app created with the MIT App Inventor platform. The colorimeter was powered by a rechargeable lithium phosphate battery. The consistency of coffee roasting was ensured by self-identifying the standard RGB values of the roasted coffee beans at five degrees (light, light-medium, medium, medium-dark, and dark) with the app. The darker the color of the roasted coffee, the lower the RGB values were gained. The color detection was highly precise, with a relative standard deviation of less than 5%.

Article ID
e2024079
Received Date 
2024-03-14
Revised Date 
2024-05-27
Accepted Date 
2024-06-10
Full Text 
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Keyword 
portable colorimeter, ESP32 microcontroller, TCS34725 color sensor, coffee beans, roasting degree
Volume 
Vol.51 No.5 (September 2024)
DOI 
https://doi.org/10.12982/CMJS.2024.079
Citation 
Comejina P., Kanna M. and Somnam S., Development of an ESP32 Microcontroller-based Colorimeter with an Android App for the Verification of Roasting Degree of Coffee Beans, Chiang Mai J. Sci., 2024; 51(5): e2024079. DOI 10.12982/CMJS.2024.079.
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Chiang Mai Journal of Science

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EMAIL
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