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Handheld Digital Altimeter

Instrumentation & Measurement Solutions -
Handheld Digital Altimeter

Handheld digital altimeters are portable devices that measure altitude based on the change of atmospheric pressure. However, a variety of additional features such as clock, atmospheric pressure, compass and weather information (temperature, humidity etc.) can usually be implemented within a single device. This combination makes it an ideal choice for mountaineers, hikers, adventure enthusiasts and search & rescue staff working in the field.

A handheld digital altimeter is composed of sensors, signal conditioning circuit, ADCs, MCU, human-machine interface, and power supply. The sensors used in a single device may include barometric sensor, magnetic sensor, temperature sensor and humidity sensor. These sensors typically provide analog output, and therefore a signal conditioning circuit (of which amplifiers are the core components) is required to implement amplification and filtering of sensors’ small signals. The processed signals are then converted into digital signals by ADCs so that MCU can calculate based on digital input and certain algorithm to get results of altitude, atmospheric pressure, temperature, humidity, etc. The human-machine interface on a handheld digital altimeter includes several functional pushbuttons and a display for showing information. The power supply consists of battery, power management and battery management. The power management is used to convert battery power into different voltages to satisfy different requirements. The battery management provides control and protection during battery charge process.

In order to ensure that the handheld digital altimeters have a small size and capability of working properly for a long life even in harsh environment, the components with high integration, low power, wide temperature range and small package, and a large-capacity rechargeable battery that can work in a wide range of temperature should be selected. Meanwhile, the approaches that can reduce system’s power consumption should be adopted as many as possible during system design.

 

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Application Notes

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EVALUATION KITS
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