ATMEL 89C4051 CMOS MicroController based digi thermo (cute palm sized)

This is Digi Thermo Cute Palm-Sized using ATMEL 89C4051 CMOS MicroController, is a device specially designed for measuring and time and temperature in chemistry laboratory.

  • The MCU: ATMEL 89C4051 CMOS Microcontroller with 4kB code memory, 128 bytes On-chip RAM and 8-bit Port1 and Port3.
  • The A/D chip: HARRIS CA3162, 3-digit DVM.
  • The A/D converter employs dual-slope integrator providing 10Hz sampling rate, while Digital output sent to MCU will be multiplexing four bit BCD started from MSD, LSD and NSD respectively.
  • Integrating capacitor: 330nF Polyester.
  • The 10k POT that connected to Pin 13 is a gain adjustment, while 50k POT to pin 8 and 9 is for zero adjustment purpose.
  • Pin 11 for HI and Pin 10 for LO for differential the input of converter.
  • LM35D used for temperature measurement tool.
  • The output signal is 10mV/°C.
  • First order low-pass filter acts as front-end hardware filtering is forming by a 100k and 0.02uF.
  • The 16×1 line LCD is connects in 4-bit interfacing to P1.4-P1.7.

The +5V power supply uses a 78L05 TO92 case with an external +9V adapter.

ATMEL 89C4051 CMOS MicroController based digi thermo (cute palm sized)

S:electronicsuite.com


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