This page (revision-30) was last changed on 2019-12-23 04:14 by Murray Altheim

This page was created on 2019-12-23 01:01 by Murray Altheim

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Page References

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USB Power Supplies
USBPowerSupplies

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At line 10 changed one line
different Pi models has differing power requirements, 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. At very least a __3 amp supply__ is probably recommended. With sensors and motors you may need something even bigger.
different Pi models has [differing power requirements|https://www.raspberrypi.org/documentation/faqs/#pi-power], 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.
At line 12 added 32 lines
Since you're building a robot, not an alarm clock, at very least a __3 amp supply__ is probably recommended. With sensors and motors you may need something even bigger. You may need to add up the estimated power consumption of all your components and add a bit extra for safety. Or use a very large power supply and actually measure the power consumption using a multimeter while your robot is running.
[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:
* Full range 85~264VAC input 
* Withstand 300VAC surge input for 5 seconds 
* High efficiency, long life and high reliability 
* Operates from -30°C to 70°C under air convection without a fan 
* Extremely low no load power consumption 
* Complete protective functions 
* Power on LED indicator 
* 5G anti-vibration capability 
* Complies with international safety standards.  
* 100% full load burn-in test 
* 3 year warranty 
* Input Frequency: 47-63Hz 
* Cold Start Inrush Current: 50A
Rather impressive.
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%%small
|| Product || Recommended PSU Current || Maximum USB peripheral draw || Typical bare-board consumption
| Raspberry Pi Model A+ | 700mA | 500mA | 180mA
| Raspberry Pi Zero W | 1.2mA | Limited by components | 150mA
| Raspberry Pi 3 Model B+ | 2.5A | 1.2A | 500mA
| Raspberry Pi 4 Model B | 3.0mA | 1.2mA | 600mA
%%
The above is a portion of the table from the [Raspberry Pi FAQ|https://www.raspberrypi.org/documentation/faqs/#pi-power].
This page (revision-30) was last changed on 2019-12-23 04:14 by Murray AltheimTop