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Try with this and check that at least you can reproduce the desired effect: http://www.arduino.cc/en/Tutorial/Ping?from=Tutorial.UltrasoundSensor Then you can refer to this for the part related to dr …

My advice: - get a model with USB port (some do not have one) - the DUE might seem attractive, but you have less libraries available and less examples, I'd recommend it more as follow up - you will …

There is a fairly inexpensive solution, but it's not Arduino based. All you need is: the Google Cardboard sdk a fairly modern and powerful Android phone (I have a OnePlusOne and it works well with …

That looks like an UNO R2, the type with DIP micro controller (you can extract it and replace it with another one, in case of problems). The R3 version is probably the best choice to get started. You …

Pin13 is attached to the onboard LED. So when you see a reference to it, it means that the program is turning the light ON/OFF. You do not need to do any wiring with it. But the logic seems strange: …

First you must verify that storing the value as int is even possible: long int can represent much larger values than int. Are you 100% sure that the maximum reading you will ever get can be represent …

In these cases where power must come from mains, my preferred solution is to buy a cheap phone charger+usb cable from ebay. They are sealed and safer than do-it-yourself solutions. The power adapter i …

It depends on what you want to do overall. Using the HC-SR04 works roughly like this: you generate a strobe on a pin for a minimum amount of time, and this strobe is understood by the sensor as "em …

An alternative way of seeing the two operations is through the operators "integer division" and "reminder of the integer division". In a more generic fashion: #include <limits.h> #define highBits(v …

possibly you will face problems with current drain and timing. There is no ready made solution. You have to get a bit farther by yourself and come back with detailed descriptions of your problems. ch …

To confirm your analysis that the issue is caused by the lower pwm frequency on the Arduino, did you try reproducing the problem with the teensy? Just divide by 3 the PWM frequency on the Teensy and s …

Those lines like currentMillis1; are completely useless You do not really have "timers", especially if your goal is to be more efficient. What you have done is to create some convoluted way to perf …

If your battery voltage is lower than 12 but sufficiently high to power the arduino (let's say 9V), you could put a white LED on the 12V line and a red LED on the battery line, like this: WH …

Like the OP wrote, you can use very simple sensors, like a phototransistor. Even simpler, if you can somehow isolate each pair LED-phototransistor, you don't even need to care about the color of the l …

This is a snippet of how I would refactor the code: void mode3() { int timeout = millis() + random(1000,5000); while (digitalRead(TriggerSensorIn == LOW) && millis() < timeout) { }; …