This device monitors up to four temperature sensors. It is programmed to sample each every second and store the highest of each in memory every 30 seconds. This allows 32 recordings and 16 minutes recording time. The intervals can be adjusted easily. The LED is illuminated when any sensor exceeds a threshold (50'C) giving a visual indication of a high temperature situation.
I have used Microchip's 8 pin PIC12F683 chip. Many other PICs with ADCs should work too. I have used the tiny MCP9701 temperature sensors; again many other 5v sensors should be suitable. I've compiled the program with the BoostC compiler.
C source code | | | PIC Projects | | | Beginners Guide |
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