Unsigned Char | Arduino Reference

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Sketch

• Function
• loop()
• setup()

Control Structure

• break
• continue
• do while
• if else
• for
• goto
• if
• return
• switch...case
• while

Further Syntax

• /* */ (block comment)
• {} (curly braces)
• #define (define)
• #include (include)
• ; (semicolon)
• // (single line comment)

Data Types

• array
• bool
• boolean
• byte
• char
• double
• float
• int
• long
• short
• size_t
• string
• String()
• unsigned char
• unsigned int
• unsigned long
• Variable
• void
• word

Constants

• constants
• Floating Point Constants
• Integer Constants

Variable Scope & Qualifiers

• const
• scope
• static
• volatile

Digital IO

• digitalRead()
• digitalWrite()
• pinMode()

Analog IO

• analogRead()
• analogReference()
• analogWrite()

Advanced IO

• noTone()
• pulseIn()
• pulseInLong()
• shiftIn()
• shiftOut()
• tone()

Serial

• Serial
• Serial.available()
• Serial.availableForWrite()
• Serial.begin()
• Serial.end()
• Serial.find()
• Serial.findUntil()
• Serial.flush()
• Serial.getTimeout()
• if(Serial)
• Serial.parseFloat()
• Serial.parseInt()
• Serial.peek()
• Serial.print()
• Serial.println()
• Serial.read()
• Serial.readBytes()
• Serial.readBytesUntil()
• Serial.readString()
• Serial.readStringUntil()
• serialEvent()
• Serial.setTimeout()
• Serial.write()

Stream

• Stream
• Stream.available()
• Stream.find()
• Stream.findUntil()
• Stream.flush()
• Stream.getTimeout()
• Stream.parseFloat()
• Stream.parseInt()
• Stream.peek()
• Stream.read()
• Stream.readBytes()
• Stream.readBytesUntil()
• Stream.readString()
• Stream.readStringUntil()
• Stream.setTimeout()

String Functions

• String.c_str()
• String.charAt()
• String.compareTo()
• String.concat()
• String.endsWith()
• String.equals()
• String.equalsIgnoreCase()
• String.getBytes()
• String.indexOf()
• String.lastIndexOf()
• String.length()
• String.remove()
• String.replace()
• String.reserve()
• String.setCharAt()
• String.startsWith()
• String.substring()
• String.toCharArray()
• String.toDouble()
• String.toFloat()
• String.toInt()
• String.toLowerCase()
• String.toUpperCase()
• String.trim()

String Operators

• String += (append)
• String == (comparison)
• String + (concatenation)
• String != (different from)
• String [] (element access)
• String > (greater than)
• String >= (greater than or equal to)
• String < (less than)
• String <= (less than or equal to)

Keyboard

• Keyboard
• Keyboard.begin()
• Keyboard.end()
• Keyboard Modifiers
• Keyboard.press()
• Keyboard.print()
• Keyboard.println()
• Keyboard.release()
• Keyboard.releaseAll()
• Keyboard.write()

Mouse

• Mouse
• Mouse.begin()
• Mouse.click()
• Mouse.end()
• Mouse.isPressed()
• Mouse.move()
• Mouse.press()
• Mouse.release()

Time

• delay()
• delayMicroseconds()
• micros()
• millis()

Math

• abs()
• constrain()
• map()
• max()
• min()
• pow()
• sq()
• sqrt()

Characters

• isAlpha()
• isAlphaNumeric()
• isAscii()
• isControl()
• isDigit()
• isGraph()
• isHexadecimalDigit()
• isLowerCase()
• isPrintable()
• isPunct()
• isSpace()
• isUpperCase()
• isWhitespace()

Bits and Bytes

• bit()
• bitClear()
• bitRead()
• bitSet()
• bitWrite()
• highByte()
• lowByte()

Arithmetic Operators

• + (addition)
• = (assignment operator)
• / (division)
• * (multiplication)
• % (remainder)
• - (subtraction)

Bitwise Operators

• << (bitshift left)
• >> (bitshift right)
• & (bitwise and)
• ~ (bitwise not)
• | (bitwise or)
• ^ (bitwise xor)

Boolean Operators

• && (logical and)
• ! (logical not)
• || (logical or)

Comparison Operators

• == (equal to)
• > (greater than)
• >= (greater than or equal to)
• < (less than)
• <= (less than or equal to)
• != (not equal to)

Compound Operators

• += (compound addition)
• &= (compound bitwise and)
• |= (compound bitwise or)
• ^= (compound bitwise xor)
• /= (compound division)
• *= (compound multiplication)
• %= (compound remainder)
• -= (compound subtraction)
• -- (decrement)
• ++ (increment)

Conversion

• byte()
• char()
• float()
• int()
• long()
• (unsigned int)
• (unsigned long)
• word()

Random Numbers

• random()
• randomSeed()

Trigonometry

• cos()
• sin()
• tan()

External Interrupts

• attachInterrupt()
• detachInterrupt()

Interrupts

• interrupts()
• noInterrupts()

Utilities

• PROGMEM
• sizeof()

Pointer Access Operators

• * (dereference operator)
• & (reference operator)

Zero, Due, MKR Family

• analogReadResolution()
• analogWriteResolution()

unsigned char

Description

An unsigned data type that occupies 1 byte of memory. Same as the byte data type.

The unsigned char data type encodes numbers from 0 to 255.

For consistency of Arduino programming style, the byte data type is to be preferred.

Syntax

unsigned char var = val;

Parameter Values

• var: variable name.
• val: the value to assign to that variable.

Example Code

unsigned char myChar = 240;

See Also

• Language : array
• Language : bool
• Language : boolean
• Language : byte
• Language : char
• Language : double
• Language : float
• Language : int
• Language : long
• Language : short
• Language : size_t
• Language : string
• Language : String()
• Language : unsigned int
• Language : unsigned long
• Language : void
• Language : word
• Language : Serial.println

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