89S52 Project Board

Wichit Sirichote, kswichit@kmitl.ac.th

Simple project board with In System Programmable Flash based microcontroller, 89S52 and 2-channel 12-bit ADC.

The 89S52 project board was designed for easy microcontroller project development. The board has two channel 12-bit ADC, 4-digit seven segment LED , text LCD connector, four tact switches, and the ISP loader.

Figure 1: The 89S52 Project Board with ISP loader and thermsitor sensor.

The hardware block diagram is shown in Fig. 2. The MCU is 89S52, 8kB flash microcontroller.

Figure 2: Block diagram of the 89S52 Project Board.


Hardware Schematic

The complete hardware schematic is shown in Fig 3.

Figure 3: Hardware schematic and BOM.

ISP Loader

The ISP loader cable can be built easily using DB25 connector and 6-pin SIP socket. The wire lenght should be less than 50 cm. The hardware is compatible with Asim's ISP software. You can also use this loader for programming the 89S52..

Figure 4: wiring diagram of the ISP Loader.


Schematic and BOM schematic.pdf
C source code thermistor.c
Orcad Schematic File N/A
Intel-Hex file thermo.hex

12 Feb 2007