Arduino Programming Language

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1 Introduction to Haptics Arduino Programming Language (optional material for beginning programmers) Allison M. Okamura Stanford University

2 Programming Guidance Potential resources: Online courses (e.g., EdX, Udacity) Web tutorials (Java or C programming languages are most appropriate) Arduino-specific tutorials In this class: You will start from existing programs (sketches) and modify them The complexity of the programming you will do is low Debugging can be difficult because of the real-time nature of haptic interaction You should learn by doing. There is little you can do to damage your Hapkit through programming mistakes!

3 We will start by going through some examples at

4 Arduino Programming Language Components Structure Variables Functions Basic syntax Arithmetic operators Control structures Comparison Operators Boolean Operators Constants Data types Scope Digital I/O Analog I/O Math Serial communication Defining your own

5 Arduino Programming Language Components Structure Variables Functions Basic syntax Arithmetic operators Control structures Comparison Operators Boolean Operators Constants Data types Scope Digital I/O Analog I/O Math Serial communication Defining your own

6 Structure: Basic Syntax ; { // /* */ #define Each statement ends in a semicolon. For example: int a = 13; Curly braces always come in pairs; they are used to define the start and end of functions, loops, and conditional statements. For example: while (boolean expression) { statement(s) Single line comment Multi-line comment Used to give a name to a constant value. For example: #define ledpin 3

7 Structure: Arithmetic operators = Assignment operator stores the value to the right of the equal sign in the variable to the left of the equal sign: sensorval = analogread(fsrpin); + - * / Addition, subtraction, multiplication, and division. For example: result = value1 + value2; result = value1 - value2; result = value1 * value2; result = value1 / value2; where value1 and value2 are any variables or constants Tips: Choose variable sizes that are large enough to hold the largest calculated result For math that requires fractions, use float variables (but there are drawbacks) Check for order of operations; use parentheses to enforce order

8 Structure: Control structures if Tests whether a certain condition has been reached. Used in conjunction with a comparison operator. For example: if (somevariable > 50) { // do something here if...else Allows you to do multiple tests. For example: if (force > 1) { // action A else { // action B

9 Structure: Control structures for Creates a loop for repetitive operations. for (initialization; condition; increment) { //statement(s);

10 Structure: Control structures switch case Allows you to specify different code that should be executed in various conditions. For example: switch (var) { case 1: //do something when var equals 1 break; case 2: //do something when var equals 2 break; default: // if nothing else matches, do the default // default is optional

11 Structure: Comparison Operators The result of a statement with a comparison operator is either TRUE (1) or FALSE (2) x == y (x is equal to y) x!= y (x is not equal to y) x < y (x is less than y) x > y (x is greater than y) x <= y (x is less than or equal to y) x >= y (x is greater than or equal to y) Tips: Be careful not to accidentally use the assignment operator = instead of ==. Cannot use statements such as 0 < x < 1; need to do each comparison separately

12 Structure: Boolean Operators && Logical AND. True only if both operands are true, e.g. if (digitalread(2) == HIGH && digitalread(3) == HIGH) { // do this only if both inputs are high Logical OR. True if either operand is true, e.g. if (x > 0 y > 0) { // do this if either x or y is greater than 0! NOT. True if the operand is false, e.g. if (!x) { // do this if x is false (0)

13 Arduino Programming Language Components Structure Variables Functions Basic syntax Arithmetic operators Control structures Comparison Operators Boolean Operators Constants Data types Scope Digital I/O Analog I/O Math Serial communication Defining your own

14 Variables: Constants HIGH LOW true false When reading or writing to a digital pin, there are only two possible values a pin can take (or be set to): HIGH and LOW Logical levels (result of a comparison): false is defined as 0 true is defined as 1 (but more broadly, anything but 0) In addition, integer and floating-point constants can be used: Decimal integers Floating point E5 67e-12

15 Variables: Data types void boolean Used in function delcarations to indicate that the function returns no information. For example: void setup() { { //... //... void loop() A boolean holds one of two values, true or false. For example: boolean running = false; if (running) { // do something

16 Variables: Data types char float double A data type that stores a character value. For example: char mychar = 'A'; char mychar = 65; // both are equivalent Coding is in this ASCII chart: Datatype for floating-point numbers, a number that has a decimal point. Floating-point numbers are often used to approximate analog and continuous values because they have greater resolution than integers. Floats have 6-7 decimal digits of precision. On the Hapkit board, double is the same as float.

17 Variables: Scope Global vs. Local: A global variable is one that can be seen by every function in a program. Define it outside a function. A local variable is only visible to the function in which it is declared. Define it inside a function. For complex programs, local variables can help prevent programming errors. However, global variables are an easy way to share information across functions. The static keyword is used to create variables that are visible to only one function. However unlike local variables that get created and destroyed every time a function is called, static variables persist beyond the function call, preserving their data between function calls. For example: static int a;

18 Arduino Programming Language Components Structure Variables Functions Basic syntax Arithmetic operators Control structures Comparison Operators Boolean Operators Constants Data types Scope Digital I/O Analog I/O Math Serial communication Defining your own

19 Functions: Digital I/O For a description of the roles of different pins on the Arduino/Hapkit, see pinmode(pin, mode) digitalwrite(pin, value) digitalread(pin) Configures the specified pin to behave either as an input or an output. pin is the pin number. Write a HIGH or a LOW value to a digital pin. Reads the value from a specified digital pin. The result will be either HIGH or LOW.

20 Functions: Analog I/O analogreference(type) analogread(pin) analogwrite(pin,value) The default reference voltage is 5V. This can be changed to a different type and different resolution using this function. Reads the value from the specified analog pin and returns a value between 0 and 1023 to represent a voltage between 0 and 5 volts (for default). It takes about seconds to read an analog pin. Writes an analog value (PWM wave) to a pin. value is the duty cycle: between 0 (always off) and 255 (always on). Works on pins 3, 5, 6, 9, 10, and 11.

21 Functions: Math min(x, y) max(x, y) abs(x) Calculates the minimum of two numbers Calculates the maximum of two numbers Computes the absolute value of a number pow(base, exponent) sqrt(x) map(value, fromlow, fromhigh, tolow, tohigh) Calculates the value of a number raised to a power Calculates the square root of a number Re-maps a number from one range to another. That is, a value of fromlow would get mapped to tolow, a value of fromhigh to tohigh, values in between to values in between. Trigonometric functions such as sin, cos, and tan are also available.

22 Functions: Serial communication Typically used for communication between an Arduino board and a computer via the USB port. Use the serial monitor to communicate with the board. Serial.begin(9600); Serial.print(val,format); Serial.println(val); Used to begin serial communications, typically at a 9600 baud rate (bits per second) Prints data to the serial port as human-readable ASCII text. Examples: Serial.print(78) gives "78" Serial.print( ) gives "1.23" Serial.println( , 4) gives "1.2346" Serial.print("Hello world.") gives "Hello world." Prints val followed by carriage return

23 Functions: Defining your own Many other functions have been created by Arduino users; some are posted at You can also define your own function. This could be used to make your code more organized and efficient. int find_text(string needle, String haystack) { int foundpos = -1; for (int i = 0; (i < haystack.length() - needle.length()); i++) { if (haystack.substring(i,needle.length()+i) == needle) { foundpos = i; return foundpos; This is a function that searches for a given string within another string. If the search string is found its position is returned, otherwise -1 is returned.

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