How do you detect that saturation point? If you have a scope and measure the current through one of the motor windings in full step mode, you should see a gradually increasing current per pulse. When you reach saturation, current will rise much much faster towards the end of the pulse and instead a sawtooth you will see a sawtooth with steep spikes at the end.

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Thats why at 5V your system did not work: not enough current was allowed due to the high L or too short dt. Suddenly, from 7.5V on there was enough current allowed to be able to spin. But if you want to be in the optimal region, you need to find a good relation between voltage (that will dictate current for a given on-pulse) and the load. The more load on the shaft of the stepper, the more current you will need, so the higher voltage you need to apply.

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Do not worry about driver and power supply. Both are protected from overload. Power supply should be higher in amps than driver or/and motor.

Stepper motors are current driven devices. In order to overcome DC winding resistance but more important the impedance of the windings due to their inductance, you will have to put some suitable voltage over it. The amount of tension needed depends on basically two factors:

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jremington: Look in the data sheet for the continuous output current instead. The data sheet also discusses what happens if that current is exceeded.

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So the 2A power supply is better than the 800mA one I was using before? And won't damage it? Also, how could I measure how long the motor can handle 7.5 volts at? Like I said, the project is almost due and can only provide the power necessary to turn the disk at 7.5 volts.

The intensity of a wave depends on the amplitude of the wave. Since light is also a wave, its intensity will depend on the amplitude of the wave.

You can treat this backlight just like an LED, light with ~3V at 20mA current and you get a pretty shape that you can mask with vinyl or draw over with a marker. You will need a resistor in series like any other LED, to set the max current. Gels can be used to change the color. We think these would make great wearables without the need for EL or inverters, they're much brighter than EL and use less battery. The trade-off is these are not flexible at all.

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well, you can let it spin at desired load and speed and check it if overheats and how fast. I guess you can use the sensors in your fingers for a balpark initial estimate. The motors are damaged by overheating because high currents and/or limited cooling, long before a higher-than-rated voltage will do other kind of damage.

At 5 volts (not coming from the arduino BTW, external supply) It cannot spin the disk that is required. At 6 volts, it is inconsistant. At 7.5 volts, it works like a charm. My question however is this; Will I damage the motor by running it at this speed for extended periods of time? Also, I am using a 1A H-Bridge, but the power supply is 2A. Will this damage the H bridge, or does it regulate the current?

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These pretty strips of light are plastic diffused backlights, often seen in LCD displays. Normally they're tucked behind the LCD and shine white light from below. Here, we've got the LEDs available individually and they're really cool! Each LED is encased in a 3.5mm thick strip of a acrylic. The acrylic strip is a special type that is very good at diffusing light, so even though there is only one single white LED, it provides near-uniform lighting. The other flat side of the strip has a reflector on it so you only get light from the top (otherwise the backlight would lose 1/2 the brightness unnecessarily).

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Ok, what would be considered a long time? Like, if its running for three hours at a time? Or if it runs 15 minutes at a time two to four times a day?

Also, I am using a 1A H-Bridge, but the power supply is 2A. Will this damage the H bridge, or does it regulate the current?

jremington: The motor can be damaged by overheating, if operated above the rated voltage for a long time. Depends on the H-bridge.

If you buy less than a full reel, you'll get a single strip, but it will be a cut piece from a reel which may or may not have a connector on it. If the piece comes from the end of the reel, the connector may be on the output end of the strip!

No way, the power supply rated current is the max it can give. It's normal (and required) to be higher than the load will draw. A car battery can provide hundreds of amps, that doesnt mean it will burn an arduino board that draws 100mA. If it is powered through the right pins of course. The current is limited by the motor's resistance, and as I mentioned above, it is high enough to keep both the H-bridge and power supply within safe limits.

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The temperature will rise in a normal way, almost linearly with increasing current. Until you reach the point where the iron stator gets magnetically saturated. This is the real maximum that you might be able to use.

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Look in the data sheet for the continuous output current instead. The data sheet also discusses what happens if that current is exceeded.

At 5 volts (not coming from the arduino BTW, external supply) It cannot spin the disk that is required. At 6 volts, it is inconsistant. At 7.5 volts, it works like a charm. My question however is this; Will I damage the motor by running it at this speed for extended periods of time?