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→Estimation de la puissance nécessaire
* 60 NeoPixels × 60 mA ÷ 1,000 = 3.6 Amps minimum
* 60 NeoPixels × 60 mA ÷ 1,000 = 3.6 Amps minimum
The choice of "overhead" in your power supply is up to you. Maximum safety and reliability are achieved with a more generously-sized power supply, and this is what we recommend. Most power supplies can briefly push a little extra current <font style="text-decoration: underline">for short periods</font>. Many contain a thermal fuse and will simply shut down if overworked. So they may technically work, but this is the electronics equivalent of abusing a rental car.
The choice of "overhead" in your power supply is up to you. Maximum safety and reliability are achieved with a more generously-sized power supply, and this is what we recommend. Most power supplies can briefly push a little extra current {{underline|for short periods}}. Many contain a thermal fuse and will simply shut down if overworked. So they may technically work, but this is the electronics equivalent of abusing a rental car.
=== J'ai besoin de 3.6 Amp. Ca ira avec un bloc de 10 Amp? ===
'''Question:''' I estimate I need a 3.6 Amp power supply. I have a 10 Amp supply on-hand. Will this cause my NeoPixels to explode?
As long as the output is 5 Volts DC, you’re golden. The LEDs will only draw as much current (Amperes) as they need. So extra Amps are OK — in fact, it can be a good thing. The larger power supply will run cooler because it’s not being pushed to its limit.
Excessive voltage, however, will definitely kill your LEDs.
'''Extra Amps = good. Extra Volts = bad.'''
=== Piles et signification "Amp heure"? ===
Amp-hours are current over time. A 2,600 mAh (milliamp-hour) battery can be thought of as delivering 2.6 Amps continuously for one hour, or 1.3 Amps for 2 hours, and so forth. In reality, it’s not quite linear like that; most batteries have disproportionally shorter run times with a heavy load. Also, most batteries won’t take kindly to being discharged in an hour — this can even be dangerous! Select a battery sufficiently large that it will take {{underline|at least}} a couple hours to run down. It’s both safer for you and better for the longevity of the battery.
=== Puis-je utiliser plusieurs alimentations? ===
'''Question:''' I need to power LOTS of NeoPixels and don’t have a power supply that large. Can I use several smaller ones?
'''Maybe'''. There are benefits to using a single supply, and large power supplies are discussed below. “Non-optimal” doesn’t necessarily mean “pessimal” though, and we wouldn’t discourage anyone from using what resources they have.
If you go this route, the key is to have all of the ground pins among the strips connected in common, but the +5V from each power supply should be connected only to one length of NeoPixels — those should not all be joined. Every power supply is a little different — not precisely 5 Volts — and this keeps some from back-feeding into others.
=== Bloc d'alimentation - les montres de puissance ===
MCHobby propose un bloc d'alimentation 5V continu pouvant fournir jusqu'à {{pl|311|10 Ampères}}. This is usually sufficient for a couple hundred NeoPixels or more. For really large installations, you’ll need to look elsewhere.
One possibility is to repurpose an ATX computer power supply. The nice beefy server types often provide up to 30 Amps. Some minor modifications are needed…Google around for “ATX power supply hack.”
Even larger (and scarier, and much more expensive) are laboratory power supplies with ratings into the hundreds of Amps. Sometimes this is what’s needed for architectural scale projects and large stage productions. And occasionally we get requests for help…
Please note that '''projects of this scale are potentially very dangerous''', and the problems of power distribution are fundamentally different than hobby-scale projects. As much as we enjoy helping our customers in the forums, they are for product technical support and {{underline|not}} full-on engineering services. If you’re developing a project of this scope, hire a professional electrician with experience in high-power, low-voltage systems such as photovoltaics or large RVs and boats. This is no charade.
=== Distribuer l'alimentation ===
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