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You can certainly use an Arduino in a commercial device. … It's especiallyuseful if you're only going to produce one or two such devices, and the customer doesn't mind the cost and size of the Arduino. …

There are two problems with a pot as a sensor. The wipers can generate electrical noise as the wiper scrapes along the track. A pot is a fairly high impedance sensor, and so the signal wires can pic …

There are two things you should do. Firstly, implement a little bit of hysterisis. Currently, it look like you're using 200 as the threshold in both the rising and falling direction. What you'll alway …

The sensor detects the magnet, and sends its output to the Arduino. This has the advantage that it works even when it's wet or dirty. …

I'm not totally familiar with the Arduino language, but I hear that it's quite like C. So this should probably work. …

I have faced a similar problem in the past, but with only two SPI devices. My solution was to use a PIC12F1822 as an SS switcher. It ran at 8 MIPS using its internal oscillator, and had code that did …

You can almost certainly do this easily using a PSoC3 or PSoC5. The PSoC chips are microcontrollers that contain re-configurable digital hardware, a bit like an FPGA or CPLD. This means you can make …

Store enough of those values in the Arduino code so that you can compensate for temperature in the future. …

As Russell suggested it's possible to make your own laser rangefinder using angles. It depends how much work it's worth. They're tricky to build and make accurate, and by the end you might wish you'd …

Get hold of a PSoC development kit. The PSoC is a microcontroller which contains re-configurable digital and analog blocks. You can basically wire up digital and analogue schematics with the IDE. Thos …

Here are some suggestions for projects which would not be hard to get into for a software developer. They might all appear rather hard, but I'm a big fan of attempting projects that are way outside my …

First you'll need to find out / calculate / measure how much current the solenoid requires, and what voltage it requires. If the voltage is less than 50v (quite likely) and the current is less than 50 …

The impedance buffer (an op-amp) is optional, but will result in much better sensor readings, especially as you intend to use fairly long wires to connect the sensor to the Arduino. …

What you're looking for is called a Trapezoidal velocity profile. There is no need to use sin waves. Smooth motion can be achieved by simply linearly ramping up the velocity to its maximum, holding …

You can buy strings of addressable LEDs, and there's Arduino code to control them. There are loads of different types available. …