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Continue to ChatPIR Sensor Interfacing with LPC2148 https://embetronicx.com/tutorials/microcontrollers/lpc2148/pir-sensor-interfacing-lpc2148/
PIR Sensor Interfacing with LPC2148 https://embetronicx.com/tutorials/microcontrollers/lpc2148/pir-sensor-interfacing-lpc2148/