Digital Converter Nt1310

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A. Sample and Hold circuit The main function of sample and hold circuit is to sample the input signal. The sampling frequency of the circuit should be follow by nyquist criteria of the sampling theorem. B. Analog to Digital converter Analog and Digital converter is used to convert the analog signal into digital sequence. The analog to digital converter took the instantaneous analog voltage value from the sample and hold circuit and converts it to the appropriate digital sequence depending the reference voltage. The AVR ATmega 8 has an a inbuilt ADC in microcontroller. C. USART USART stands for universal Synchronous Asynchronous Receiver transmitter. It is sometimes called the serial communication interface or SCI. …show more content…

RS232 connector In telecommunication RS232 is a standard for serial communication transmission of data . it formally defines the signal connecting between DTE(data terminal equipment) such as a computer terminal, and DCE(data circuit terminating equipment) such as a modem. The RS232 standard commonly used in computer serial ports.[3] When we connect the RS232 connector cable to the computer. The operating system of the computer assigns a port number to the RS232 port. These port number used in the programing to identify the data from coming serial port. The Baud rate of DAQ device an computer is must be …show more content…

23 programmable I/O lines 2. 28 pin PDIP o Peripheral Features 1. Two 8-bit Timer/Counters with Separate Prescaler and Compare Mode 2. One 16-bit Timer/Counter with Separate Prescaler, Compare Mode, and Capture Mode 3. Real Time Counter with Separate Oscillator 4. Six PWM Channels 5. Programmable Serial USART 6. Interrupt and Wake-up on Pin Change AVR ATmega 8 comes with on chip analog to digital converter and USART module. For storing the embedded program the AVR microcontroller comes with an 8k on chip flash program memory. The Baud rate of an USART can be adjust using a program. We have to program it according to our requirement.[2] V. RESULT The result of the output of LABView shown in figure 4.These shows that the DAQ device worked satisfactory. It works for temperature monitoring and level monitoring. VI. CONCLUSION A low cost DAQ system device has been implemented and tested. It gives satisfactory response. These device can be used in for various application at collage level as well as industry level. The Daq device can used in biomedical also. these and shows the output. Snapshot of an output shown by labview is showed in following

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