Our site saves small pieces of text information (cookies) on your device in order to deliver better content and for statistical purposes. You can disable the usage of cookies by changing the settings of your browser. By browsing our site without changing the browser settings you grant us permission to store that information on your device.
Q. SONG1,* , W. WU1, S. ZHU1, H. YAN1
A capacitive drop sensor composed of the drop head and a cylindrical ring plate is designed for drop growth study. The weak capacitance signal is processed in frequency modulation circuit. The high frequency signal is measured by 8254 fast counter, which is controlled by the single-chip microcomputer 89C51, based on pulse-counting method. The counting result is stored in 89C51 first and then is transmitted to PC, through MAX232 bi-directional level transition chip, in accordance with RS-232 communication protocol. The circuit connection and the error analysis are introduced in detail. The content and flowchart of the communication protocol are presented.
SCM, Capacitive sensor, Frequency, Signal processing.
Q. SONG, W. WU, S. ZHU, H. YAN, Single-chip microcomputer for application in the capacitance-frequency conversion circuit used in drop sensors, Optoelectronics and Advanced Materials - Rapid Communications, 1, 5, May 2007, pp.242-246 (2007).
Submitted at: Jan. 19, 2007
Accepted at: April 5, 2007
Optoelectronics and Advanced Materials - Rapid Communications
(2024): Impact Factor = 0.4 - Journal Citation Reports (Clarivate Analytics, 2025)
Active accounts were imported to the new platform and assigned a random password by default. In order to access your account you need to access the login page and go through the Lost Password dialog (involves the system sending you an email with instructions) in order to reset your password. This step is necessary as passwords are kept in hashed form and the new platform uses modern hashing algorithms incompatible with the previous ones.