This is a commentary on a project that replaced the sensor used in the previously published "Visitor Notification System" with a Doppler sensor.(From "Overview" in this book)Conventional pyroelectric sensors react to people and automobiles, but they also react to leaves and domestic cats, so we were not able to get the satisfaction we expected.Since an infrared sensor cannot be used outdoors, we tried using a Doppler sensor that uses radio waves. This is convenient because it can be used by sticking it inside the resin case without opening a window in the case.Also, add a microcomputer to read the width of the pulse signal from the sensor. If the width is greater than the boundary value, it is assumed that more than a certain amount of objects has been detected, and the conventional wireless device is notified.For OLED, we don't use external libraries, only use standard libraries. Since detailed usage is described, it can be used for other applications. When not changing parameters, it turns off access to the OLED and allocates all CPU time to object detection. Parameters are stored in EEPROM.---------------[Visitor notify system] table of contents[1] Overview (1) Overall structure (2) Additional main parts (3) Software development environment (4) Overview flow chart (5) Circuit diagram (6) Photos (7) Doppler sensor[2] Data handling (1) Detection processing (2) Flowchart[3] Detection program (1) Interrupt part (2) 10ms timer section (3) 100ms timer section[4] Display and setting (1) Current value display (2) Boundary value setting (3) Display program (4) Push button input section (5) Stored in EEPROM[5] Display on OLED (1) Creation of bit pattern (2) Display on OLED device[6] All program code (1) OLED section (2) Key input section (3) EEPROM section (4) Display section (5) Interrupt section (6) Main section[7] Postscript

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