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To press a switch, you'll need some kind of expensive solenoid or servo, and mechanical linkages, and mounting hardware, and trigger pressure characterizations, and power-loss state characterization, …

If you've got less than the pitch of the connectors between the bottom of the male pins and the Arduino PCB (or the male pins are touching the PCB) then the pins are too long, your female headers are too … In this case, you need to replace the plugged header on your Arduino. Does this answer your question? …

This is a huge jump from the Arduino/Processing framework. Your Arduino has an 8-bit processor with 1k of RAM. … Next, move up to communication over the UART, start using interrupts, and redo some of your Arduino projects in C. Then, find (or make!) …

What is the current requirement of the motor? If it's less than 60mA, you can probably get away with sinking the current. Be aware that some digital pins can sink more current than they source. At …

It's possible that the Arduino IDE doesn't support line lengths of this size, you can break it up using the continuation character \ at the end of your line: const char javascript[] PROGMEM = "<script …

The emulator guide states: In this release [3.1, accessed 5/27/11], the limitations of the emulator include: No support for placing or receiving actual phone calls. You can simulate phone calls (pla …

If you want to go for it, powering your device with a solar panel the size of the Arduino (.004m^2, or 40cm^2) will not be trivial. … You'll need a switching regulator, and you'll probably want to bypass the 7805 on the Arduino for this (or tap into the USB Vbus line). …

As in, you send the Arduino a command over the UART, or flip some switches to a binary value, and tell it to set the volume to 11? …

This might be useful if you had the speaker at a remote location from the Arduino, and want to run a low-current differential signal on a twisted pair out to the speaker, which would be powered from a …

No, you can't do that with an op amp. Op-amps require power supplies. Many opamps have dropouts just like your 7805, so the output cannot quite reach the power rails. Others, called rail-to-rail o …

This can be used to get a decent first approximation, but division on an Arduino is expensive. …

You'll need to connect one pin of your Arduino to its strobe pin, and an ADC pin to read the amplitude. … If you want more customization than that, you're probably looking at doing some DSP work on the Arduino-is there a library for that yet? …

The AVR, like most microcontrollers, uses memory-mapped IO. In a nutshell, this means that a part of the memory space of the microcontroller is reserved for the peripherals. When you change a bit in …

Your Arduino will generate voltages close to 0V and close to 5V, but not precisely those voltages - That should be OK. … The Pong game may draw more current than your Arduino is capable of providing, leading to lower voltages (even constant 0V output) - That would be a problem. …

I'm no expert on alternative FAT libraries, but the linked issue and a brief skim of the SD library tells me that it's something of a RAM hog. Your ATmega328 has 2kB of RAM. How much of that are you …