(1992-1995, Collaborated in developing the hardware based on MCS-51 microcontrollers.)
The controllers had multiple versions with high accuracy, multiple-channel, multi-step and self-adaptation. They were used in many laboratories at Xia'men University, China.
Features:
- multi-segments (30) and long control-time
- multi-chanels: 1-32
- high accuracy: <= 0.5°Ç
- The Award of the Chinese '85' Science and Technology Achievement, 1996
Publication:
- Zhou, T.; Liang, Q., XCC Serial Intelligent Programming Temperature Controllers, Experimental technology and management, 36(10), 1993
Addtional Information:
- Central: RAM and ROM connected to 8051 microcontroller (lower addresses were latched by 74HC373 (Octal D-type transparent latch; 3-state); EEPROM was for storing users' program. Soft watchdog was for reliable operation.
- Display: Multiple 7-segment LED digital display, 8 ports of 8051 drove 7-segment and decimal point; other ports drove several transistors for the common anodes of the display
- Keyboard: Either 16 buttons or 4 buttons design.
- Signals In: 1-32 thermocouples were selected by the multiplexer. After passing by am amplifier, the signal from the selected thermocouple was converted by an ADC (sigma-delta) and read into 8051 microcontroller.
- Controls Out (multiple): The control signal sent from 8051 was transferred by Optical Isolator (optocoupler), SCR (Silicon Controlled Rectifier) to the oven.
- I/O: emulated RS-232, printer.
