This device monitors up to four temperature sensors. It was developed to measure cyclinder temperatures in 150 and 300cc 2 and 4 cylinder petrol motors used in large model aeroplanes. This has helped develop efficient air ducts in the cowl and to set mixtures correctly.
Temperatures are measured every second and displayed in real time via three LEDs for each cylinder. The 'first' green LED flashes when the temperature reaches 80'C and becomes solid when it reaches 90'. The yellow flashes at 100' etc. Various combinations reveal temperatures up to 160'C.
The highest temperature measured in every 20 second cycle is stored in memory. This allows 64 recordings per sensor and 21 minutes recording time. The intervals can be adjusted easily. This data is downloaded after flight for analysis using Excel (graphs above).
I have used Microchip's 20 pin PIC16F687 chip and the tiny MCP9701 temperature sensors. I've compiled the program with the BoostC compiler.
C source code | | | PIC Projects | | | Beginners Guide |
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