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Capacitors probably aren't a bad idea but since your arduino is running off a separate power supply and the biggest reason for having the capacitors is to stop the arduino from behaving erratically when drawing too much from its power, I think you could skip them if you want and still have it work fine.

int num = random(1, 501);

Check out the description of the constructor, particularly at the bottom: www.arduino.cc/en/Reference/LiquidCrystalConstructor

@@gbosdet1 Thanks for your quick answer :) The only constructor I could find with 6 inputs is the following: LiquidCrystal(uint8_t rs, uint8_t enable, uint8_t d0, uint8_t d1, uint8_t d2, uint8_t d3); ( github.com/arduino-libraries/LiquidCrystal/blob/master/src/LiquidCrystal.h ) This is also forwarded to the init() with init(1, rs, 255, enable, d0, d1, d2, d3, 0, 0, 0, 0) setting d4-7 to 0 if I get it right. (line 50 in the cpp github.com/arduino-libraries/LiquidCrystal/blob/master/src/LiquidCrystal.cpp ) So I would assume, that only data pins 0-3 are used. When using the lcd however, I do it like described in the link you've kindly attached and it works fine, I just cant find where the library actually links the input values to d4-d7. I think there is something I'm missing :/ Thank you very much for your help!

I think they are just variable names in the program and when the hardware is set to 4 bit mode it is looking for the data to just be connected to LCD pins 4-7

@@gbosdet1 Ah ok so it's just inconsistensy in the labeling. Thanks a lot for your help :)

@@pallme100 That is my guess anyway. No problem!

I was using it as a decoupling capacitor for the motor driver chip as the way I control motor speed is through turning the chip on and off at 490 or 980 Hz depending on which pins you are using to analogWrite to the enable pin of the L298D chip. I was worried that that kind of periodic significant power draw could turn the voltage at the Vin pin of the Arduino to sort of a square wave and that might cause the arduino to behave unpredictably so I threw in the capacitor to smooth out the main battery power. It still works without it, but I think I get less glitches with it in.

Sorry for the scattered nature of it all. This is mainly where I host my videos to use in my edX course for my students. You would want to check out: The millis function: czcams.com/video/PcdNKGBwJ2A/video.html Auto Callibration Trick: czcams.com/video/PTeBZLc4FQ8/video.html The tone function: czcams.com/video/i2zMKf5xsXM/video.html Piezobuzzers: czcams.com/video/FlXtH_zqUP4/video.html Light Theremin Explanation: czcams.com/video/yylcGB5Qw_0/video.html

Glad it helped!

A is the amplitude of the motion. The absolute value of the maximum value it can attain. Another way to write this is Xmax.

Sorry for the remarkably late reply but I just found the CZcams page where it shows unanswered comments. You've probably already figured this out but I would wrap your map with a max and a min like this: percent = min(max(map(...), 0), 100);

@@gbosdet1yeh looking back it was a newborn question. I just made a talking rfid Motorcycle system. Chimpo mcdoodle on Facebook

You are not the first person to comment on that. I never quite know how to take it.

It depends, the capacity value determines how slow or fast its going to work, while the voltage is the maximum value that it can holds. In your case, you need a capacitor with more than 6 V (10, 15, 20,...).

Thanks!