Abstract:
In each type of liquids contents physical material that has a
conductivity to deliver a current. More or less the conductivity in a
liquid defines ability to deliver electrical power. The aim of this
research is to measure the conductivity level of liquid with
microcontroller and compare which liquid that has a higher ability to
deliver the electrical power. Measurement of conductivity from a
liquid can be done through censor, Analog to Digital Converter
(ADC), microcontroller AT89C51 and Liquid Cristal Display (LCD).
Censor will be connected in parallel with a resistor to get a voltage
divider. The voltage in censor will be varied depend on the level of
measured resistance. The conductivity can be seen when censor is put
in a liquid. The voltage fluctuates before it achieves the stability. ADC
converts the analog value (from censor) to digital value.
Microcontroller gets the data of voltage from ADC, process it and
send the result to LCD. In this research, the liquid used are sulphate
acid, alcohol, methylated spirit and lead acid battery. So, it can be
identified which liquid has a higher ability to deliver the electrical
power. The result shows that alcohol has a higher electrical power
delivery rather than sulphate acid, methylated spirit and lead acid
battery. On the other hand, lead acid battery has lower electrical
power delivery than sulphate acid, alcohol and methylated spirit. The
maximum percentage of fault from the measurement is 1.3%.
