Digital Altimeter Circuit
The circuit employs a pressure sensor (IC4) that operates on the principle of a Wheatstone bridge, allowing it to accurately measure pressure changes. The output from the pressure sensor is typically a differential voltage that needs to be amplified and converted to a single-ended voltage for further processing. This is achieved through a DC amplifier that enhances the signal strength, making it suitable for subsequent analog-to-digital conversion.
IC1 serves as a reference voltage source, crucial for establishing a baseline for barometric pressure measurements. This reference voltage ensures that the readings from the pressure sensor are accurate and reliable, compensating for any variations in the sensor's output due to environmental factors.
The A/D converter IC3, manufactured by Intersil, plays a vital role in translating the amplified analog signal into a digital format. This conversion is essential for interfacing with digital displays or microcontrollers. The LCD module connected to IC3 provides a user-friendly interface, displaying real-time pressure readings and calibration data.
For calibration purposes, a vacuum pump can be utilized to create a controlled pressure environment, allowing for precise adjustments to the sensor's output. The water-based manometer serves as a secondary reference, providing a visual indication of pressure changes and ensuring that the sensor is calibrated accurately against a known standard.
Overall, this configuration allows for effective pressure measurement and monitoring, with a focus on accuracy and ease of use in various applications. A pressure sensor (IC4) is used with a dc: amplifier to convert the bridge output (IC4) to a single-ended voltage. ICld provides a reference voltage for setting barometric pressure. IC3 is an A/D converter manufactured by Intersil. This drives an LCD module. Calibration reads out in fact. A vacuum pump and a water-based manometer can be used for sensor calibration.
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