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.
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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.
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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..
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Figure 4: wiring diagram of the ISP Loader.
Download
Schematic and BOM schematic.pdf C source code thermistor.c Orcad Schematic File N/A Intel-Hex file thermo.hex
12 Feb 2007