DEVELOPMENT OF A LOW COST MICROCONTROLLER - BASED HAEMOGLOBIN METER

• K D Adedayo

  Department of Physics, Federal University of Technology, P. M. B.704, Akure, Ondo State, Nigeria.

• T Ewetumo

  Department of Physics, Federal University of Technology, P. M. B.704, Akure, Ondo State, Nigeria.

• I Konwea

  Department of Physics, Federal University of Technology, P. M. B.704, Akure, Ondo State, Nigeria.

• T Ewetumo

  Department of Physics, Federal University of Technology, P. M. B.704, Akure, Ondo State, Nigeria.

This work looked at the determination of haemoglobin level in the blood using haemoglobin meter; an instrument for determining the absorbance value of haemoglobin in a sample of blood in g/dl.The haemoglobin meter was developed using light emitting diode (LEDs), a phototransistor, operational amplifiers, microcontroller (arduino board), liquid crystal display and a dark compartment. Samples of blood were smeared on a slide that was fixed between the LED and, phototransistor in the dark compartment. The LED emits radiation of visible light that pass through the blood sample which is detected by the phototransistor and is sent to the amplifier that amplifies the signal to a magnitude that can be picked up by the analog to digital converter (ADC) on the arduino board. The digital signal is then programmed by the microcontroller unit and the value is displayed on the liquid crystal display. The meter was calibrated against a standard (SH 120-1) and was examined for the accuracy of haemoglobin level. The developed system performed favourably well with the standard with a correlation value of0.98 at a percentage of 0.01% and the resolution is 0.001 g/dl.

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