Thermistor based thermometer

This thermometer doesn’t use any fancy digital temperature sensors – it is based on NTC thermistor which resistance depends on ambient temperature. Design is based on Atmel89S52 microcontroller which drives four 7 segment LED displays and reads temperature value via external 12-bit ADC (LTC1298). ADC values are read through SPI interface. Reading accuracy is about 0.1ºC accuracy. Continue reading