![]() Unfortunately, the term brightness is often somewhat inaccurately used instead of radiance or luminance. This is a quantity of photometry, where the spectral response of the human eye is taken into account. ![]() The luminance is the luminous flux per unit area and solid angle, with units of candela per square meter (cd/m 2).This quantity is used in radiometry, where the physical properties of light and not its visual perception are relevant. The radiance is defined as optical power ( radiant flux) per unit area and solid angle its units are W cm −2 sr −1.For actual quantitative references, one should usually use one of the following terms: in the context of physiological sensations that is recommended by the U.S. The term brightness should be used only for non-quantitative references, e.g. How to cite the article suggest additional literature The reason for this is that variables take up memory when the code is running - something that an Arduino Uno doesn't have a lot of, whereas a #define takes up no memory - the compiler uses it as a "search and replace" before compiling your code.Encyclopedia > letter B > Brightness Brightnessĭefinition: a term mostly used in a qualitative way, related to the output power and beam quality of a laser quantitatively: often used instead of radiance or luminance You have used variables to store various non-changing numeric values, such as "maxBright = 255 " which is good practise, but is better (particularly with Arduino development) to use #define macros instead, such as "#define MAX_BRIGHTNESS 255". You need a new global variable at the top of your file for currentBrightness (int currentBrightness = 0 ). You do not need to store your current button states (buttonStateA) or your counts for the number of button presses (buttonPushCounterA - which you never referenced anyway) or your ms value so could get rid of those global variables. Finally the LED brightness is set regardless of whether any buttons have been pressed. Similar actions are performed for the B button, but with a decrement rather than an increment. Next the current button state is stored as the previous state ready for the next run through the loop. If it is different to the previous state and it is low, the current brightness is incremented and capped at a maximum value. The current button A state is read and stored in a local variable. Hopefully this is pretty self explanatory. If (currentBrightness < MIN_BRIGHTNESS) // MIN_BRIGHTNESS is defined at the top of the file with #define MAX_BRIGHTNESS 0 ![]() If (currentButtonStateB != lastButtonStateB & currentButtonStateB = LOW)ĬurrentBrightness -= BRIGHTNESS_INCREMENT Int currentButtonStateB = digitalRead(buttonBpin) If (currentBrightness > MAX_BRIGHTNESS) // MAX_BRIGHTNESS is defined at the top of the file with #define MAX_BRIGHTNESS 255 If (currentButtonStateA != lastButtonStateA & currentButtonStateA = LOW)ĬurrentBrightness += BRIGHTNESS_INCREMENT // BRIGHTNESS_INCREMENT is defined at the top of the file with #define BRIGHTNESS_INCREMENT 25 Int currentButtonStateA = digitalRead(buttonApin) This would be my replacement for your loop() code: loop() The next problem is that you are looping through all your brightness values when a button is pressed giving you your "fades all the way up in one go" problem. One problem in your original code is that you are only storing the current state of the buttons if they are pressed. fade from min to max in increments of 25.5 points: basically (0.5 volts) If (digitalRead(buttonApin) = LOW) //if buttonA is pushed Int lastButtonStateB = 0 // previous state of the button Int buttonStateB = 0 // current state of the button Int buttonPushCounterB = 0 //counter for the number of button presses Int lastButtonStateA = 0 // previous state of the button Int buttonStateA = 0 // current state of the button Int buttonPushCounterA = 0 //counter for the number of button presses Int buttonBpin = A1 // buttonB to analog 1 Int buttonApin = A2 //buttonA to analog 2 HERE is my code: int ledPin = 9 // must be a PWM digital pin CODE IS DIFFERENT from another post I did Here is my code that I have so far can someone help me with telling the Arduino to Step each time a button is pressed. I would like to have the LED step each time I press the button not all at once. The Problem I have is that when I push buttonA the LED steps it's voltage by 0.5V all the way to 5.0V and with buttonB its steps down to 0. I am using an Arduino UNO and I am trying to vary the brightness by steps by 0.5 volts till it gets to a max of 5.0 V using buttonA and decrease the brightness of the LED by 0.5 volts with buttonB.
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