const unsigned char sample2[] PROGMEM = { 100,96,84,72,60,58,46,34,20,18,4,12,20,38,46,54,62, }; int inPin = 7; void setup() { pinMode(inPin, INPUT_PULLUP); } int lastPin = HIGH; // HIGH means not pressed for Pullup Inputs void loop() { int pin = digitalRead(inPin); if (pin == lastPin) return; if (pin == HIGH) { startPlayback(sample1, sizeof(sample1)); } else { startPlayback(sample2, sizeof(sample2)); … Read more
You should change “.” to ‘.’. “” means string not a char solved Why same char is not equal [closed]
On line 4 it says #define PinOut1 try adding a space to make it #define PinOut 1 EDIT: There were also a few other things I noticed after this post so I compiled a fixed version of your code: #include <Servo.h> #define trigPin 13 #define echoPin 12 #define PinOut1 11 Servo myservo; int AnalogIn=A0; int … Read more
Read the data as string using: string input = bluetooth.readString(); Then convert string to int using: int servopos = int(input); Then write the position to the servo:servo.write(servopos); Now depending on the data you send from android, you could need to : Trim it: input = input.trim(); Or constrain it : servopos = constrain(servopos,0,180); Your corrected … Read more
About your specific bug you should ‘dht’ does not name a type That means you have the word dht that is not at a place where the compiler could understand what you mean. how do i change it to a type? You do not want to change it into a type, you want to solve … Read more
Introduction Type errors in Arduino refer to errors that occur when the data type of a variable or an expression does not match the expected data type. These errors can occur when a variable is declared with the wrong data type, when a variable is used in an expression with an incompatible data type, or … Read more
WiFiClient object wraps a TCP socket. A normal TCP socket is connected to IP address and port. WiFiServer starts a listening socket on a port. If server on listening socket is contacted by a remote client socket, it creates a local socket connected with the remote client socket on a free port and returns a … Read more
You can do it recursively. First part size m = (str_size+N-1)/N; Then str_size -= m; and N–; A little example: #include <iostream> #include <vector> #include <string> std::vector<std::string> split_string(const std::string& s, int N) { std::vector<std::string> vect; if (N > s.size()) return vect; vect.resize(N); int n = s.size(); auto it = s.begin(); int Nnew = N; for … Read more
You need to have some kind of storage on your backend side, which will map RFID IDs to some website. Then you could redirrect user to that website with HTTP codes 301 or 302. Here is a pseudocede example for client and server: # Client rfid_id = get_rfid_id() make_request_to_server(rfid_id) # Server storage = { ‘12345’: … Read more
Yes, you can run a webserver with Arduino. This is the example from https://www.arduino.cc/en/Tutorial/WebServer /* Web Server A simple web server that shows the value of the analog input pins. using an Arduino Wiznet Ethernet shield. Circuit: * Ethernet shield attached to pins 10, 11, 12, 13 * Analog inputs attached to pins A0 through … Read more
Declare “int temp;” at the top. The same for all other variables. Do not declare the variables in GetState, just use them. Remove all “return” lines from Getstate(). Just setting “temp=DHT.temperature;” sets the variable and is enough. solved Problem With Functions And Printing Function Values in arduino [closed]
This sets x to a value from -15 to 15 (inclusive) based on the voltage at pin analogPort. 15 means 5 volts and -15 means 0 volts. This value is then used to set a delay between 100 (-(pow(2*15,2))+1000) and 1000 (-(pow(2*0,2))+1000) since the square of 2*x and 2*-x yield the same number. In other … Read more
I see a couple of issues. First, use the if..then..else construct or a switch for the several if..then statements. And, when you do a comparison to a char 10 is two char values so a simple == won’t work. You could convert it to an integer first, using atoi and then do a comparison, or … Read more
Well, Serial.println(“Resistance 1: ” + String(f1r) + ” ohms”); it uses the variable f1r whose scope just ended. In C++, when a variable is defined inside a scope (between some { and }), it does not exist outside of it. solved ‘ variable’ was not declared in this scope [closed]