Advantages And Disadvantages Of Smartphones

1191 Words5 Pages
Abstract: - Today smartphones are readily available with source of power, faster processing capabilities and connectivity. In this paper, we propose design of circuit to harvest power from widely available standard 3.5mm headphone jack of smartphone itself. Headphone jack can generate tones (sine or square) within the frequency range of 20-20KHz. we have also developed GUI of an android application for tone generation which plays sine wave. The audio output channels of smartphones from different manufacturers were characterized in order to determine the range of design parameters. Proposed design provides few milliwatts to power mHealth peripherals and enhances practicality of smartphone as a medical device. It could be the better option…show more content…
So, among smartphone’s various analog interfaces, headphone jack is only option which is open, standardized, and widely accessible. The audio headset jack offers a path to interface medical devices with a mobile phone (Kuo etal. 1). University of Michigan’s Hijack project demonstrated that data and power can be transferred over the common headset jack opening a method to connect sensors to existing mobile phones. Drawing power from the headset jack eliminates the need for batteries or alternate power sources thus keeping cost, size, and weight down. It reduces the logistical need for batteries to keep the devices operating. Sending diagnostic results through the audio headset jack forgoes the need for a proprietary data communication port. Almost all mobile phones have a headset jack so it can serve a near universal solution for transmitting low bandwidth data to a mobile phone. In addition, a modular platform could be developed around the headset jack interface to add other sensor modalities such as EKG, temperature, blood pressure, etc. (Kuo et al.…show more content…
active mode and low power mode. In active mode, both outputs are enabled with enhanced response performance. In low power mode, the LDO is disabled to disconnect peripherals. The TPS610981 generally consumes around 250nA of current. If input voltage is greater than a pass-through threshold, the boost converter stops switching and passes the input voltage to VMAIN rail. We find that proposed design can provide up to 50 mA total output current at 0.7 V input to 3.3 V output conversion. Hysteretic controller topology is used for boost to obtain maximum efficiency at minimal quiescent
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