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07-4-2009, Current Projects, Muhhamad M. Raza,,

Shown below is the Semi-Invasive Liquid Level Measurement and Alert Circuit (SILLMAC) sensor. The sensor and the circuit are currently under design by me as part of a personal project. More updates will be uploaded as the design progresses. The sensor is a coaxial capacitive sensor, and has a linear relationship to the fluid level. The design requires that the corrosion on the metal conductors be eliminated. This design requirement will be met by insulating the conductors. Therefore no current passes between the cathode and anode. Size and weight are yet another set of requirements, as is cost. The size requirement will be met by using surface mount components. The device must be able adaptable to a future telemetry system. Since fuel tanks differ, upon purchase or construction of the device, the hardware must be able to mesh with a user selected size for the actual sensor. This will be accomplished by allowing the user to field program the device to the limits of the fuel tank (i.e. the capacitance).

Currently the problems I am encountering are that the readings for capacitance are not as steady as would be hoped. The capacitance values are actually quite small (in the picofarad range). Though only a picofarad resolution is required, it would be beneficial to have at least a tenth of a picofarad resolution. The possible, and viable solutions are being investigated. The basic stamp 2 is quite expensive, and although the hardware has been prototyped with a program to accompany the hardware, more cost effective microcontroller solutions are being sought.

Semi Invasive Liquid Level Measurement and Alert Circuit Sensor

Semi Invasive Liquid Level Measurement and Alert Circuit Sensor


Home made Laptop Cooling System Analysis

04-28-2009, Current Projects, Muhhamad M. Raza,,

Analysis of a homemade laptop cooling pad's design
I built a pair of cooling pads a while back, and the only capabilities I had at the time in terms of analysis were nil. So the design relied heavily on concept. The strategy I had was to locate the location of the laptops CPU and then place CPU fans on the cooling pad such that I would keep the laptop cool even if I get another laptop in the future.

Most of the laptop cooling pads that are found at local retailers are either ineffective, of very delicate or unacceptable quality, and they generally lack any proper air flow. Also I built my cooling pads so that there are 3 speed settings to control the flow of the air. This feature proved useful for when the laptop was running in a high state (running MATLAB code, or playing video games, etc., etc.).

Aluminum Cooling Pad

Please check back soon for more updates.