%0 Journal Article %T Digitally Synthesized Alternative Current Sinusoidal Waveform for Resistive Sensor Measurements %A K. N. Trachanidis %A A. T. Soilemes %J Journal of Engineering Science and Technology Review %D 2011 %I Kavala Institute of Technology %X This paper presents a circuit that has the ability to provide a sinusoidal current waveform. The produced waveform is alternative,so it takes positive and negative values. This circuit comprises a microcontroller, a DAC with current outputand a fast electronic switch. The sine wave samples are stored in the microcontroller¡¯s data memory and are applied to theDAC¡¯s digital 8-bit input. The complementary output currents are connected alternatively through the electronic switch tothe ground. At pre-calculated timing the microcontroller changes the polarity of the switch, allowing the DAC¡¯s output, asalternative current, to flow through the resistive sensor (load), ending through the switch to the ground. Another microcontrolleracting as data acquisition chip, at the positive peaks is sampling the voltage across the load. These measurements aretransferred through the serial port to a PC, where the resistance is calculated and presented on screen. %K Digital Sine wave %K Current Source %K Resistive Sensors Microcontroller %K Embedded Application %U http://www.jestr.org/downloads/volume4/fulltext092011.pdf