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Arduino Rover Project - Failed in First Attempt

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So What failed?
I had 2 ground level sensing IR Sensors. They both failed in outdoor sunny environment. They worked fine in initial design phase.
I also had 1 Ultrasonic sensor for obstacle clearance. That too failed during operation. I assume my rover motor speed is too high. Also I used to 2 old 9V batteries in parallel connection to power up the bot, but I believe the power was not sufficient. Also to use the Analog pins in the motor shield extended from Arduino Uno, I had soldered a bunch of wires to the pins. This would have caused to much loss of power because of lengthy circuits.
Finally I chose a poor cheap glue gun which mad the setup even messier. I hope to learn from the lessons from this attempt and build a better clean rover next time. I am even thinking of building a rover with MOSFET instead of using Motor Shield. I don't know if it will work but I'll try.

The code for my Arduino Rover Project is uploaded here
https://github.com/greenxgene/Arduino-Rover-Project/blob/main/Rover_Project.ino

Let me know if you find anything unusual.
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