Design and Performance Test of Relative Humidity and Temperature Controlling Devices Using the Micro controller AT89C51 for Drying
Abstract
The objectives of this research were to design and to produce relative humidity and temperature controlling devices using the Micro controller AT89C51 hardware and to control the heater performance of a dryer.
The works was carried out in three stages: designing, constructing and performance testing of the devices. The associated apparatus includes the SHT 75 sensor, a keypad, an LCD, and a driver relay. The “Assembler†language was used to develop a computer software. The output of measurements of the product temperatures and relative humidities of the air were used to control the heater and blower operation during drying. The readings of the developed devices were compared with the ones using the corresponding conventional apparatus.
The results showed that the devices works well for measurement of a set values of RH and temperature. Compared with the conventional method, the difference in readings were in the order of 0.07oC to 0.53oC (temperature) and 0.16 to 0.98% for RH in the range of RH between 75 – 79%.
Â
Key words: temperature and RH control, drying, Micro controller AT89C51, SHT75 sensor
Downloads
Published
Issue
Section
License
Authors who publish with this journal agree to the following terms:- Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal
- Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal
