It was designed for 3.3 V, but I'm testing at 5 V just because it was easy to just plug into the Activity Board headers...
This runs it past redline though... The LEDs are pushing 54 mA and they are rated for a maximum of 50 mA. The current limiting resistors and the I/O expander chips are a bit warm...
I've seen before how you can interface 5V I2C devices directly to Prop pins, so wasn't a surprise there really...
Just did a field test on chalk line in the driveway...
Works OK when in the shade. Sun messes it up though...
Have to print a visor to keep the sun away from the sensors...
Chalk gets on the back wheel too... Perhaps I should polish it with some acetone...
That was a tough line to follow!
My bot was ill prepared for that challenge...
But, I think this one would have a chance.
These sensors give you a value, not just a binary result.
So, they can distinguish the line, even with sunlight.
But, it'll be a whole lot easier to program if it had a visor that can block the sunlight.
May have to lower the sensor as well, but hoping to avoid that...
Just designed up this sun visor.
Wanted it to be snap on, but that didn't work out.
This is going to use the same 2 screws that secure the line array sensor to the bot.
It's printing now... Maybe tonight can see if it fits...
Comments
First time using them.
Seem to be a good option for low cost, low volume production...
The Activity Board sized PCB will give me a touchscreen for display, audio amp and a Nunchuck connector for manual control.
Just wish Digikey sold it. Had to get from Mouser...
Be the guy who makes a robot arm that spins a fidget spinner.
See it, then be it, big shoutout to RayRay!
I've got IR things now... Just need some time to solder it up...
It's installed and appears to be working.
It was designed for 3.3 V, but I'm testing at 5 V just because it was easy to just plug into the Activity Board headers...
This runs it past redline though... The LEDs are pushing 54 mA and they are rated for a maximum of 50 mA. The current limiting resistors and the I/O expander chips are a bit warm...
I've seen before how you can interface 5V I2C devices directly to Prop pins, so wasn't a surprise there really...
http://forums.parallax.com/discussion/166763/
The line following competition is heating up!
Congrats, always nice to hear things are going well and as planned.
Works OK when in the shade. Sun messes it up though...
Have to print a visor to keep the sun away from the sensors...
Chalk gets on the back wheel too... Perhaps I should polish it with some acetone...
https://youtu.be/nqspME7FDOA
http://forums.parallax.com/discussion/139607/participating-in-the-parallax-expo-lfo-line-following-open-2012
My bot was ill prepared for that challenge...
But, I think this one would have a chance.
These sensors give you a value, not just a binary result.
So, they can distinguish the line, even with sunlight.
But, it'll be a whole lot easier to program if it had a visor that can block the sunlight.
May have to lower the sensor as well, but hoping to avoid that...
Wanted it to be snap on, but that didn't work out.
This is going to use the same 2 screws that secure the line array sensor to the bot.
It's printing now... Maybe tonight can see if it fits...