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You need the void loop() function on your sketch. This function gets called directly after the setup. If it's not there, then the program cannot compile. You cannot put any execution code (means code …

Your code has several problems: You are including the MS5837 library twice. That just doesn't pose a problem, because the library has include guards, that make sure it is only included once. At glob …

You defined, that every command will end with \r\n. So you need to choose "Both NL & CR" as line ending in the Serial monitor, so that it appends the line ending to your command. If you don't send the …

First of all you have to make sure, that you select the same baudrate in the Serial Monitor, that you used in your sketch with Serial.begin(). This error is very common and garbage values is the sympt …

The library, that you are using, doesn't seem to support exporting or importing fingerprints. Though if you look into the user manual of the fingerprint sensor at the Adafruit site, there are two comm …

This depends on what you consider "hacked". Do you care about someone reading the data, or changing it on its way to the target? Or do you provide endpoints to trigger something in your project from t …

The BMP180 uses the I2C bus and you cannot simply turn off the device, since that can block the I2C bus. Also it has only one, not changeable address. Thus you would need one I2C bus for every BMP180. …

The values seem fine to me. Generally these MPU chips are really noisy, that is totally normal. Ti really use the data to the the current orientation, you have to use a filter to combine the data from …

Your current code will not show all notes of a scale. Only the notes at 1 and 2 will light up, since you don't sum up the numbers, that you have stored in MajorScale. But I think it is not a great ide …

I cannot say much about the example code, that you mentioned. The posted example code is not complete, also the second part with the for loop is plain wrong. A for loop looks like this for(<Variable …

The main issue here is, that you are reading data, that might not be received yet. This: if (Serial.available()) { will check if there is any data in the Serial buffer. As the code runs rather fast a …

No,you cannot split the voltage and expect the devices (Arduino and LED strip) to work correctly together (would lead to different ground levels beside other problems). For getting a different voltage …

In the function Update_Ultra_Sonic() you do the measurement and save the result in the variable duration. Then you print the variable cm, but you haven't calculated the value for this variable yet. Yo …

Your calculation is not correct. The encoder has its 0 to 10V output voltage distributed over the whole distance, that the cable can reach, so 1.25m. And that gives you the resolution: 1.25m/1024 = 1. …

Here you can find the manual of your stepper driver. Look at page in the section "CN3 (I/O signals)". Beside the pulse and directions, that you already set in your code, there are 2 more input signal …