Simple Fire Alarm Circuit:
Here is a simple fire alarm circuit based on a LDR and lamp pair for sensing the fire.The alarm works by sensing the smoke produced during fire.The circuit produces an audible alarm when the fire breaks out with smoke.
When there is no smoke the light from the bulb will be directly falling on the LDR.The LDR resistance will be low and so the voltage across it (below .6V).The transistor will be OFF and nothing happens.When there is sufficient smoke to mask the light from falling on LDR, the LDR resistance increases and so do the…Read More on Simple Fire Alarm Circuit
Digital Sound Recorder with AVR and DataFlash:
Features
• Digital Voice Recorder
• 8-bit Sound Recording
• 8 kHz Sampling Rate
• Sound Frequency up to 4000 Hz
• Maximum Recording Time 4 1/4 Minutes
• Very Small Board Size
• Less than 700 Bytes of Code Download Digital Sound Recorder Electronics Project
Electronics Mini Project Topics and Ideas:
- 4 Digit 7-Segment Multiplex DISPLAY
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