Rangkaian Thermometer Berbasis Mikrokontroler AT89S52


Posted on Feb 6, 2014

This is a circuit of a microcontroller AT89S52 Thermometer and 12-bit ADC LTC1298, programs written in the language c program with digital filtering and interface the LED display. The reading provides 0. 1C sensitivity. The hardware block and circuit diagram is shown in Fig below. The sensor is epoxy molded thermistor. The circuit for signal condit


Rangkaian Thermometer Berbasis Mikrokontroler AT89S52
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ioning is a simple voltage divider. The ADC is 12-bit SPI interface LTC1298 analog-to-digital converter. The microcontroller is Atmel 89S52. The display has four digits 0. 5 inches 7-segment LED. The segment driver provides 32-bit CMOS output. The ADC is 12-bit (LTC1298 or MC3202) are two channels, CH0 and CH1. The input signal from thermistor for ADC channel 0 is simple voltage divider. Channel1 is available for other sensor. The sample shown in schematic is HIH-3160 Honeywell Relative Humidity Sensor. The ADC chip is interfaced with MCU, 89S52 with P1. 1, P1. 2 and P1. 3. The display has 4-digit LED. The 4094 CMOS shift register drives the LED directly.




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