This page (revision-18) was last changed on 2019-12-23 11:17 by Murray Altheim

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Power Supplies...nobody
PowerSupplies

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At line 3 changed one line
When you're working on your robot you'll likely want to plug it into a wall socket rather than run it from batteries. You'd call that a [Bench Power Supply].
When you're working on your robot you'll likely want to plug it into a wall socket rather than run it from batteries. You'd call that a ''Bench Power Supply''.
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We'll focus on the [Raspberry Pi] since it generally requires more power than other [microcomputers/microcontrollers|microcontrollers]. The Raspberry Pi requires a 5 volt power supply and generates an onboard regulated 3.3 volt supply for its peripherals. Most processors suitable for small robots require either 5 volts or 3.3 volts, but if they have a USB connector on them it's likely so you can use a USB charger as a power supply. Obviously, ''read the user manual''.
We'll focus on the [Raspberry Pi] since it generally requires more power than other [microcomputers/microcontrollers|microcontrollers]. Most processors suitable for small robots require either 5 volts or 3.3 volts, but if they have a USB connector on them it's likely so you can use a USB charger as a power supply. Obviously, ''read the user manual''.
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For a Raspberry Pi you'll need a reliable __USB Power Supply__ (5 volts) with enough current capacity to run your processor (e.g., [Raspberry Pi]), your [sensors], [motors] and any other accessories (such as displays).
The Raspberry Pi requires a 5 volt power supply and generates an onboard regulated 3.3 volt supply for its peripherals. You can use a reliable __USB Power Supply__ (5 volts) with enough current capacity to run your processor (e.g., [Raspberry Pi]), your [sensors], [motors] and any other accessories (such as displays).
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!! How Much Power?
!! So How Much Power?
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[{Image src='USBPowerSupplies/nuclear.jpg' caption='Serious Power' alt='serious power' align='right' class='imgFloatRight'}]
There are a number of companies providing USB Power Supplies specifically for the Raspberry Pi. Each of the
different Pi models has differing power requirements (see below), with recommended PSU (Power Supply Unit) current capacities ranging from 700mA for the Model A to 3 amps for the Pi 4, but these numbers don't include sensors or motors.
[{Image src='USBPowerSupplies/nuclear.jpg' caption='Serious Power' alt='serious power' align='right' class='imgFloatRight'}] There are a number of companies providing USB Power Supplies specifically for the Raspberry Pi. Each of the Raspberry Pi models has different power requirements (see below), with recommended PSU (Power Supply Unit) current capacities ranging from 700mA for the Model A to 3 amps for the Pi 4, but these numbers don't include sensors or motors.
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[Jaycar|Vendors] sell a ''[Mean Well 70W 5V 14A Power Supply|https://www.jaycar.co.nz/mean-well-70w-5v-14a-power-supply/p/MP3289]'' that actually __delivers__ 70 watts: 5 volts at 14 amps for NZ$54.90. It's not as pretty as the Apple unit but as a bench power supply it looks pretty good. Here's the specs:
[Jaycar|Vendors] sell a ''[Mean Well 70W 5V 14A Power Supply|https://www.jaycar.co.nz/mean-well-70w-5v-14a-power-supply/p/MP3289]'' that actually delivers 70 watts (5 volts at 14 amps, do the math) for NZ$54.90. It's not as pretty as the Apple unit but as a bench power supply it looks pretty good. Here's the specs:
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\\
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The above is a portion of the table from the [Raspberry Pi FAQ|https://www.raspberrypi.org/documentation/faqs/#pi-power].
The above is a portion of the table from the [Raspberry Pi FAQ|https://www.raspberrypi.org/documentation/faqs/#pi-power]. There's also a table showing typical power usage "during standard processes" (which doesn't include driving your robot up a steep incline, but might be helpful...). They define a "stressed" Raspberry Pi 3B as using 1.34 amps. Stall current on a robot motor can be 5 amps.
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Hmm. Clearly we need to think about this a bit more.
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The problem is, the companies selling these units are not always very honest about the power ratings of their
The problem is, the companies selling USB chargers are not always very clear about the power ratings of their
This page (revision-18) was last changed on 2019-12-23 11:17 by Murray AltheimTop