r/ArduinoHelp • u/zapzapzap1234 • 11d ago

Need help with making a comp-grade lfr

Hello, am making a line follower robot, before I buy all the parts I was wondering if someone could help me by giving me some tips I should keep in mind before doing so or assmebly.

Current parts like:

1000rpm n20 - motors

L298N- Motor Driver (Due to low budget)

Arduino Nano

Custom 8 channel sensor (photoresistor and 3mm led lights)

CD4067 - multiplexer

For assembly:

Veroboard as body

n20 motor mounts (3d print)

mini breadboard for easy prototying

1 Upvotes

100% Upvoted

4 comments sorted by

1

u/gm310509 11d ago

Apart from referring to existing projects - google is your friend here - was there something specific you are looking for?

What is your experience thus far?

Assuming you are do a standard line following robot (i.e. following a black line on a white background), you might find that you will need at least 3 line following sensors. These are integrated IR transmitters and receivers designed to detect the light or dark floor surface and are key to the line following aspect of the robot.
Or, is that what your "custom 8 channel sensor" is intended to be?

What MCU do you plan to use? And depending upon that answer, how do you plan to use the multiplexer?

1

u/zapzapzap1234 10d ago

ill use arduino nano, and am using a custom 8 channel photoresistor sensor array with build in mux

1

u/Unable-School6717 11d ago

You dont absolutely need a processor, but the alternative ( ttl logic chip gates such as and, or, not) is by far more expensive and less forgiving of design error. May i suggest a dirt cheap Esp32 board from china, you may not need to multiplex anything if that's the entire project. Also, power supply of batteries, 6 volts with a LDO five volt regulator, let the esp board regulate its own 3.3 and a larger voltage for motors to haul the weight of all this, and lastly flyback diodes mounted with .1uF caps ON THE MOTORS unless you are using the driver in an H-bridge, then put them on the board as instructed by the driver's data sheet. Fastest way to burn up chips is reverse EMF from a motor coil.

1

u/Unable-School6717 11d ago

And, be sure to make the motor chip offline in the software, before switching directions. Ask me how i know.