138.EIGHT CHANNEL DATA LOGGER _89C51 BASED_.pdf

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www.svsembedded.com SVSEMBEDDED [email protected], CONTACT: +91-- 9491535690, +91-- 7842358459

EIGHT CHANNEL DATA LOGGER (89S52 BASED)
Aim:
To capture data (Analog) from sensors and display on PC

Block diagram
Serial

8 0 5 1 COMUTER

LCD DISPLAY

ADC 8 Bit

Senso r

www.svsembedded.com SVSEMBEDDED [email protected], CONTACT: +91-- 9491535690, +91-- 7842358459

www.svsembedded.com SVSEMBEDDED [email protected], CONTACT: +91-- 9491535690, +91-- 7842358459 Description:
Analog to Digital conversion Many times it is required to monitor physical phenomena such as temperature, pressure, humidity, light intensity, sound intensity, force, etc. Such physical phenomena can be monitored by digital systems employing sensors. However sensors generally produce a change in resistance, voltage or current. All such phenomena can be converted into a change in voltage levels. Since the sensors and the subsequent signal conditioning circuits provide a proportionate change in voltage with respect to the phenomena, this cannot be directly interpreted by a digital system. A sensor is usually an analog voltage and can take any value between + 10 to -10 volts. However a digital signal has only two states. 1(ON) or 0(OFF). Thus it is required to have additional circuitry between the digital system and analog system that translates the analog signal in to a digital signal. Such conversion can be performed by an analog to digital converter. A characteristic feature of A to D converters is its resolution; another important feature is the conversion speed. Higher the resolution more the number of bits required to represent the data. The digital data from the A to D chip becomes available when the chip indicates end of conversion. The A to D chip requires a clock for producing the conversion. An 8 bit ADC can produce a count of 255 for full scale. I.e. if the full scale (5V) then 5/255 will be the least value that the A to D can measure. This is called 1LSB. This value multiplied by the port data produces the voltage at the analog input of the chip. Another important aspect of any A to D conversion is the analog ref. Voltage supplied to the chip. The accuracy of this voltage dictates the accuracy of the reading.

Hardware:
• • • • • Microcontroller MCP3208 LCD display Computer Optionally a sensor

Skill set:
• • • Functionality of all above components Embedded C programming Serial communication programming in embedded C

www.svsembedded.com SVSEMBEDDED [email protected], CONTACT: +91-- 9491535690, +91-- 7842358459

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