Wheel Forces Calculations

By Anthony Dunigan Back of the envelope calculations for wheels and electronic slip differential In order for the project to move forward in our Level 2 requirements numbers 8 and 9. We need to gather calculations based on our 6 in (0.0762m)  wheel diamater.   Names of constants and variables   r = radius (m), […]

Solar Current Sensor Experiment

(Written By: Edgardo Villalobos – Manufacturing/Solar Panel) This project requires current sensors in order to measure the current running through the solar cells. We are having 36 solar cells on the solar panel. We are using 12 INA3221 current sensor breakout boards to do this because they each contain 3-channels, support high-side current and bus […]

Stepper Motor Control

By Renpeng Zhang   In this demo, I tested the 28BYJ-48 stepper motor with the ULN2003 stepper motor driver. I used one Arduino for the control of the stepper motor. Since it’s recommended to use an external power source, I just used another Arduino solely for the purpose of providing 5V DC to the motor […]

Solar Panel Voltage Calculations

By Edgardo Villalobos   Solar Panels need to be able to charge a 12-Volt, 7-Ah (10-Ah) battery Rule of thumb: Solar Panel Voltage = Battery Voltage x 1.5                             Solar Panel Voltage = 12-V x 1.5             […]

Encapsulation Trade Off Study

By Edgardo Villalobos   PLEXIGLASS Plexiglass provides a lightweight, about 3 lbs per 8 sq. ft. with a 0.065 thickness, anti-reflective surface and is classified as a scratch resistant surface. Although plexiglass is virtually impossible to break and scratch resistant, it can scratch much easier than glass. If this material is used to encapsulate solar […]

Chassis Fritzing Diagram

By Renpeng Zhang   Based on the interface definition, I created the fritzing diagram for the chassis part of the pathfinder. It consists of the Arduino Leonardo with two HC-SR04 ultrasonic sensors. It has the HC-05 bluetooth module connected to the Arduino through the TX and RX pins for the communication through a phone using […]

Solar Cell Current Sensing

By Edgardo Villalobos Test Paragrapgh sdfsd fsdf sdf sdf.   INA3221   Original Eagle CAD   Custom PCB with 2 INA3221     Three INA219 = One INA3221   Description The INA3221 is a three-channel, high-side current and bus voltage monitor. It contains the setup of 3 INA219 single-channel, high-side current and bus voltage monitor. […]