Real Time G-Meter with Peak/Hold ECE480 Team 4:

Real Time G-Meter with Peak/Hold ECE480 Team 4:

Real Time G-Meter with Peak/Hold ECE480 Team 4: Karl Anderson, Shuhan Chen, Corey Fox, Eric-John Kohler, Tim Carroll, Dan Svoboda Spring 2013 Abstract Key Parameters The purpose of this project was to develop a portable G-Meter, roughly the size of a cell phone. Potential applications of the product include logging destructive acceleration during the shipment of a packages. The on-board microcontroller is programmed to perform several important functions. It is capable of recording peak acceleration events and logging the time at which they occurred. The meter also features real-time RMS calculation and a set of six bandwidth filters to monitor acceleration within a specific frequency range. Display and record peak g events and RMS readings. Must record time and date of occurrence. 30 days on 2 AA batteries Selectable bandwidth filters Hardware Design Initial Prototype The first prototype was constructed in three separate modules on solderless protoboards. EAGLE Schematic The messy original circuit was carefully documented and recreated in EAGLE. Testing Block Diagram This diagram represents a high-level view of the G-Meter. Each block was implemented by a member of the group. The G-Meter is dynamically calibrated using the earths static gravitation (1G) as a reference. The on board clock was measured, and deviates by less than a minute over a one month period. Accelerometer Final Production Two PCBs were created and populated with components. Inside the final enclosure, the PCBs are stacked along with the screen and battery pack. Bandwidth Filters Memory Voltage Regulator 2 AA Batteries 2x8 LCD MSP430 Microcontroller Display Driver Control Buttons DIP Switches Software Code on the MSP430 microcontroller: Continuously reads acceleration and computes RMS values and peaks Maintains a real time clock with time and date for peak log Sends data to the screen through the display driver circuit Utilizes interrupts and low power modes to reduce power consumption Real Time G-Meter with Peak/Hold ECE480 Team 4: Karl Anderson, Shuhan Chen, Corey Fox, Eric-John Kohler, Tim Carroll, Dan

Svoboda Spring 2013 Abstract Key Parameters The purpose of this project was to develop a portable G-Meter, roughly the size of a cell phone. Potential applications of the product include logging destructive acceleration during the shipment of a packages. The on-board microcontroller is programmed to perform several important functions. It is capable of recording peak acceleration events and logging the time at which they occurred. The meter also features real-time RMS calculation and a set of six bandwidth filters to monitor acceleration within a specific frequency range. Display and record peak g events and RMS readings. Must record time and date of occurrence. 30 days on 2 AA batteries Selectable bandwidth filters This diagram represents a high-level view of the G-Meter. Each block was implemented by a member of the group. EAGLE Schematic The messy original circuit was carefully documented and recreated in EAGLE. The G-Meter is dynamically calibrated using the earths static gravitation (1G) as a reference. The on board clock was measured, and deviates by less than a minute over a one month period. Accelerometer Coreys g testing data here? Bandwidth Filters 2 AA Batteries 2x8 LCD Voltage Regulator Display Driver Control Buttons DIP Switches Memory Initial Prototype The first prototype was constructed in three separate modules on solderless protoboards. Testing Block Diagram MSP430 Microcontroller Hardware Design Final Production Two PCBs were created and populated with components. Inside the final enclosure, the PCBs are stacked along with the screen and battery pack. Software Code on the MSP430 microcontroller: Continuously reads acceleration and computes RMS values and peaks Maintains a real time clock with time and date for peak log Sends data to the screen through the display driver circuit Utilizes interrupts and low power modes to reduce power consumption

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