egr314-team308.github.io

Component Selection

Op Amp

Solution	Pros	Cons
Op Amp. Part No. BD1321G-TR Price: $ 0.69 Each Link	Surface mount is in line with class requirements General purpose so we can potentially use it for other things Range of acceptable voltage already includes 3.3V	Relatively low temperature range (hard to solder)
Op Amp Part No. 2156-OPA234E-ND Price: $ 1.00 Each Link	Has an extremely large voltage range (2.7-36V) Durable in extreme temperature and moisture. Does not require much supply current	Can only be bought in bulk (100+)
Op Amp Part No. 505-AD8630ARZ-ND Price:$ 9.21 Each Link	Zero-Drift OpAmp minimizes input offset voltage. Durable in extreme temperature and moisture.	Price is much higher than other available OpAmps

Choice: BD1321G-TR

Rationale: Our team chose this OpAmp because it meets class requirements and is able to be surface mounted, it is a general person OpAmp which means our team could use it for multiple subsystems, and it meets the acceptable voltage range required for our design.

Anemometer

Solution	Pros	Cons
Anemometer No. 1528-1328-ND Price: $44.95 Each Link	Relatively easy to use	Expensive Needs an extra part to research
Motor Part No. 505-AD8630ARZ-ND Price:$ 3.86 Each Link	Cheap Runs in a voltage range from 2.7 to 5V. Simple voltage change output.	Will require external wiring. Will not work with stepper-specific motor drivers.
Motor Part No. 3567-PAV1015-ND Price: $49.00 Each Link	Product has a digital output Small enough to fit in a compact design Datasheet has a typical voltage curve already	Cannot sense direction on its own Through hole mounting Most likely inaccurate

Choice: 505-AD8630ARZ-ND

Rationale: We chose this component as it is the most realistic for this type of project. Using a motor as an anemometer is cheap and simple with a constructed wind cup. As an input, the microcontroller can use the voltage changes produced by the motor’s rotation.

Analog to Digital Converter (ADC)

Solution	Pros	Cons
<img src="7.JPG"width:20%;height:20% /> ADC Part No. 584-AD7858ARZ Price: $29.15 Each Link	Product has 4 inputs and 4 outputs Has a supply input range (3-5V) Uses SPI	Extremely moisture sensitive
ADC Part No. 595-ADS8924BRGET Price: $13.22 Each Link	Can withstand extreme temperature Has a supply input range (3-5V) Considered a “High Speed” ADC Uses SPI	Has only one output channel
ADCr Part No. 595-TLV1543CDW Price: $8.88 Each Link	10 bit Extremely small 3-5.5 V input voltage	Single-ended input limits output to voltage differentials.

Choice: 595-ADS8924BRGET

Rationale: Due to the moisture sensitivity the first option is unrealistic; another subsystem is meant to detect moisture. The single output can be worked with since the component is small and the pcb would only need to fit two or three. The only other physical contradiction to the choice would be soldering difficulty.

Switching Voltage Regulator

Solution	Pros	Cons
Switching Voltage Regulator Part No. LTC1502CS8-3.3#PBF Price:$3.42 Each Link	Fits most of our criteria	Max Input Voltage is 1.8 V Higher Cost
Switching Voltage Regulator Part No. MC7805BDTG Price: $0.67 Each Link	Input Voltage max of 35V Cheap	Output Voltage Minimum of 5V Would not output 3.3 easily
Switching Voltage Regulator Part No. MCP1700T-3102E/TT Price: $0.50 Each Link	Cheapest option	Requires an amplifier due to it only outputting 3.1Vt

Choice: MCP1700T-3102E/TT

Rationale: The team chose this regulator to simplify what we have to do to meet the requirements. It was fairly difficult to find a regulator that accepts 9 volts and outputs a fixed 3.3 volts. Amplifying the output voltage would be simpler than regulating it or decreasing the input voltage by 8V.

Motor Driver

Solution	Pros	Cons
Motor Driver Part No. IFX9201SGAUMA1 Price:$4.88 Each Link	Cleared by graders Available in Peralta 5-36 V input voltage	5V input conflicts with 3.3V input of many other components
Motor Driver Part No. EMC2301-1-ACZL-TR Price: $1.24 Each Link	Specifically notes use with PWM pins on microcontrollers Works with selected motor	3-3.6 V input voltage 6 week lead time
Motor Driver Part No. EMC2305-1-AP-TR Price: $2.46 Each Link	16 pin PWM based Can be obtained in 4 weeks	3-3.6 V input voltage

Choice: IFX9201SGAUMA1

Rationale: Our team chose this motor driver as we already have access to it through the adjacent storage room. Minimal soldering will be needed to implement it in a given circuit. Also, the component’s functionality will necessitate a voltage regulator, which is included as a subsystem. This motor driver should be able to relay the PWM signal from the microcontroller with minimal effort.

Power Budget:

This is the power budget for all of our main components It shows our device is to run for 160 hours on a 9 volt battery. Meaning we have about a week of runtime.