These pages created by Wichit Sirichote of Department of Applied Physics, Faculty of Science, provides schematic and software for hobbyists to practice “learn by doing”, build a simple microcontroller projects at home.
Some of the projects include – The 4 Channel Pt100 Thermometer, G5-Data Logger, Solar Recorder, 89S52 and PIC Project Board. Even circuits, code and SBC for the popular 8051 can be found here.
I do remember the Intersil ICL7135 very clearly. This year 2011, almost 29 Years, the classic integrating type analog to digital converter is still interested. With a cheap price and easy interfacing, I think I will design a cheap digital volt meter with microcontroller to provide serial interface similar to the Fluke45. Two channels is good for scientific experiment. The serial port RS232 is also nice for interfacing to the PC. Let us see the prototype of the meter in Figure 1. The display for each channel is 8-digit 7-segment LED. It is cheap and very reliable.