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Remember that the setup() function runs once, and then the loop() function runs forever. So to keep the blue LED light, simply turn it on, but never off. The code for the red LED remains unchanged. …

It's sounds silly, but just get an UNO, a breadboard, wires, 1 resistor (220 ohm) and an LED. Wire up a LED circuit, and program the Arduino to flash the LED. (There's a million examples of this all …

Check the baud rate of your serial monitor matches what you have set in your setup() function. In the above code that is 9600. If the baud rate is incorrect you typically get rubbish output in the s …

The Arduino will easily drive this relay board, and it needs only a very small input current. The board you linked to has a built-in optical isolation circuit, so there is no direct electrical connec …

Do all the processing on the Arduino, and supply the results to Matlab over serial. I'm not 100% sure about your particular encoder, but generally encoders talk in "Grey Code". This is a series of b …

I've had better success with this version. I did not work out the problem with the first version. Although I did find the rear legs of the push-button were lighting up a LED - but only when pushed. …

These 16x2 LCDs are fairly sensitive about their power requirements. As a first step, I would check the VCC and GND wires are well connected, and closely connected on the breadboard near the LCD. If …

I am making a "Electronic Dice". I have 7 LEDs to form the output, and this works fine. My problem is getting a random result on the output. int die_face = 1; void loop() { if (analogRead(BUTT …

Is the device on the other side of the bluetooth connection running at 9600 baud too ? You say you transmit the state of the sensor - which BTW is only ever a space ' ', and never changes. So that …

A simple HC-05 module will give you a wireless bluetooth connection. They're fairly simple to setup, and you can write data to them the same as one would the Arduino serial console. Obviously they c …

The program is fine. Looking at the first photograph - The Ground of the Arduino needs to be connected to the ground of your circuit. I do not understand the two-transistor part of your circuit, so …

I suspect these delays are caused by TCP buffering. For some theory on this sort of thing, perhaps read about Nagle's Algorithm which covers some of the issues with small packet buffering. It seem …

It's difficult to answer without details of how your server works. If your arduino is simply connected to the server, the server could open the arduino serial port (e.g.: COM5: or /dev/ttyUSB0) and s …

Ints and unsigned ints are 16 bits on AVR ATmegas. So while the argument passed is a 32-bit value, sprintf() is expecting a 16 bit value. The stack is packed with twice as much data as needed. From …

The sprintf() function has a memory cost because of the library import at compile time. But it only costs that once, no matter how many more times you use it. Unless you're running out of space, mem …