Best photoelectric sensors according to redditors
We found 5 Reddit comments discussing the best photoelectric sensors. We ranked the 2 resulting products by number of redditors who mentioned them. Here are the top 20.
We found 5 Reddit comments discussing the best photoelectric sensors. We ranked the 2 resulting products by number of redditors who mentioned them. Here are the top 20.
Optical sensors that I bought off of amazon:
https://www.amazon.com/gp/product/B00XT0PBC0/ref=oh_aui_detailpage_o09_s00?ie=UTF8&psc=1
They work flawlessly. Their max sensing distance is probably a little more than 1/2", so the balls have to pass fairly close to them. I ordered some blaze orange balls and they work perfectly with those. Then I ordered a set of lime-green balls and for whatever reason, those balls do not trip them AT ALL. I haven't yet found anything else that doesn't trip them.
> might they be moving too quickly for a break beam IR or photoresistor?
A photocell will respond plenty fast. To get the Arduino to respond quickly enough use a digital photocell or obstacle detector module connected to interrupt-on-change pins, either on Arduino pins directly or via an IO expander like the PCF8575.
H-Bridge (for the UNO there are also shields)
Sensors e.g. this / that though you can also get tctr5000 modules for cents elsewhere.
And note that if you are not set on a line-follower, the kit you've chosen already includes the ultrasonic distance sensor which is nie for robotic projects as well :-)
Do you have a soldering iron and multimeter? Even a cheap $4 multimeter is fine for low-current & low-voltage tasks, and makes your life easier (checking voltages, connections, resistor values...)
As for a soldering iron, even a $1 will do (if it doesn't burn down your house ;-) ) - but an adjustable temperature one will be more worthwhile. Even a $20 soldering station will do to get started if you don't want to spend $80-$100. I tried to avoid soldering for years, and it was a big mistake. It's actually easy and useful.
And another note: The 2wd and 4wd chars will not always go in a straight line. Motors don't run 100% in sync, even at the same voltage.
With a rotary encoder you can ajust the speed in software. You can use one of those IR reflective sensors modules, or a gap sensor, or even a hall sensor... example
You can also get 2wd kits example, but overall, they aren't as great of a value (and as you can see, they just include the standard modules)
A "sensor shield" like in that kit is nice though as it reduces the wiring chaos a bit :-) They cost $1 for the UNO at Aliexpress, probably more expensive at Amazon.
I found this 10 pack of light sensors on Amazon: https://www.amazon.com/Gowoops-Digital-Intensity-Detection-Photosensitive/dp/B01N1FKS4L/ref=sr_1_3?keywords=arduino+light+sensor&qid=1565710705&s=gateway&sr=8-3
Let's say I got these and attached them to each LED on the speaker splitter. Would I be able to attach 8 of them (mute LED and 7 zone LEDs) to the same microcontroller?