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57 votes

How Raspbian Detects Under Voltage

If you want to do it with a shell script, here is a solution that works on Pi 1, 2 & 3 (not tested in zero). With the command: /opt/vc/bin/vcgencmd get_throttled If the answer is: throttled=0x0 ...
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43 votes
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Is setting `max_usb_current=1` to give more power to USB devices a bad idea?

It seems that the only concern is that your power supply, if it's not a decent, reliable supply capable of 2A+ of clean output power, might not be able to power the Pi sufficiently, resulting in ...
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43 votes
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Power consumption of Pi Zero W?

Based on the measurements made by RaspiTV, here are some estimates: 100 mA: No peripherals connected, WiFi And Bluetooth off 160 mA: Bluetooth turned on 170 mA: WiFi turned on 230 mA: Camera ...
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34 votes
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Why do the Pi GPIO pins use/give 3.3V and not 5V?

The ATMega chips specify Operating Voltage: ̶ 1.8 - 5.5V. If you read deeper the operating speed is dependent on voltage. They work at 3.3V but you have to limit the clock speed. The Arduino team ...
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33 votes
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Why does the Raspberry Pi not have a power button?

Modern power buttons use the Advanced Configuration and Power Interface (ACPI) to request the OS to turn its motherboard off. That's why, for a couple decades now, if you really want the motherboard ...
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30 votes
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Is it okay to just pull the plug?

I don't make a habit of unplugging the pi in the sense of eschewing shutting them down properly except when I've lost networking on a headless pi, in which case I am usually too lazy to plug in a ...
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29 votes

Will any external battery power a Raspberry Pi?

Short answer Yes, most (but not all!) USB power banks are capable of powering a Raspberry Pi, since they usually have an output voltage of 5 V. And yes, by using a (quite large) 50 Ah power bank, you ...
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29 votes
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Raspberry Pi 3 vs Pi 2 power consumption and heat dissipation

There's a short piece that includes Pi 3 benchmarks over at the PiMoroni blog. All of the benchmarks below were carried out with just a USB keyboard and mouse connected with power supplied from ...
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28 votes

Raspberry Pi 3 vs Pi 2 power consumption and heat dissipation

When shutting down the HDMI and USB on the Pi3, the current drops to 160 milliAmps. In my tests, this was roughly 200 milliAmps on the Pi2. Thus, shutting down hardware (if you don't need it), can be ...
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28 votes
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Turning 'tvservice' on and off leaves screen blank

tvservice is not the best to turn off and on the screen. Much better way to do this (found after a day of searching) is using vcgencmd command (more on this here). vcgencmd display_power 0 turns off ...
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26 votes

What is the highest voltage from the power supply a Raspberry Pi 3 B can handle without getting damaged?

No, you should not increase the voltage any further... and at least this answer linked in the question does not suggest to do that. From Raspberry Pi Power Limitations: Power sources SHOULD ...
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23 votes

Current draw for +/2/3/0 models

If you don't want to click links, the Raspberry Pi can handle 4.75v to 5.25v. As for the current draw/power consumption, here are some numbers: All of these are bare-bone (does not have any ...
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23 votes
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Raspberry Pi lifespan reliability

I assume you're talking about using the Pi for digital signage purposes. For the last years we have deployed hundreds of Pi's doing exactly that. Many of our Pi's are not as lucky as yours: they're ...
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22 votes

How to safely switch off the Raspberry Pi?

You are not doing anything wrong. The activity LED should flash 3 or 4 times just before power off. It is then safe to remove the power. I typically shut-down, go away for a few minutes, and then ...
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20 votes
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Measure RPi3 power consumption without external hardware

The Pi has no inbuilt current or voltage sensors which could be used for monitoring its own current draw, or a battery supply. You will need to track down a multimeter or other measuring device (this ...
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19 votes

How to safely switch off the Raspberry Pi?

You do not need to remove power to restart Pi. There are a pair of pads near the SD Card (I think labelled reset possibly run - I can't see on my Pi because they all have switch soldered on the board.)...
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17 votes

How do I measure the current power consumption?

Your best bet is to use a USB voltmeter/ammeter between your USB power source and the Pi. In addition, you will require: a USB micro to USB 'A' convertor from the power source to the USB voltmeter; ...
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17 votes

Measure RPi3 power consumption without external hardware

The Pi 3, while idling, consumes about 220 mA. Under loads, it is known to reach up to 1 A, and with USB devices plugged in, it can reach 2.5 A. There is no on board current sensor, so this is only a ...
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17 votes
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Use MacBook charger for Raspberry Pi 4

NOTE: Please read the Follow up, 14 Aug 2020 near the end of this post. The "Raspberry Organization" has released revised hardware for the RPi 4B that you should know about before buying. ...
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16 votes

How much energy does the Raspberry Pi consume in a day?

I am running a Raspberry Pi2 with a 2TB Western Digital element hard disk mounted as root disk (apm set to 254 - effectively disabling standby) via a Y-connector. Using a USB VA meter (eBay link - ...
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16 votes
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Why am I getting a rainbow screen and flashing red PWR LED with a new Raspberry Pi 3B+?

I've made this answer to summarize the experience to this issue. We are talking about Raspberry Pi 3 Model B+, released on 2018-03-14. It has some new and updated features compared to Raspberry Pi 3 ...
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16 votes

What is the highest voltage from the power supply a Raspberry Pi 3 B can handle without getting damaged?

The MAXIMUM is 5.25V, although this should NOT be the target. You should not apply more than 5.1V That is not to say the Pi will be damaged by the higher voltage, because nothing uses 5V - the on-...
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15 votes

Power consumption of Pi Zero W?

I'm currently testing my RPi Zero W with temp, humidity and barometric pressure sensors hooked up. I have two 3,000 mAh batteries wired in parallel. They also go through an Adafruit regulator. Once I ...
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13 votes
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What are the Electrical Specifications of GPIO pins?

There is no OFFICIAL published electrical specifications for the Broadcom SOC, however there are a number of sources. One which can be considered authoritative is by Gert van Loo (who did the hardware ...
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13 votes

Powering the Pi 4 - safe voltage levels and current requirements

Voltage level The power management IC (PMIC, see section 3) is a MXL7704 with an input voltage range of 4.0 V to 5.5 V and an absolute maximum rating of 6 V that must not be exceeded. Considering ...
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12 votes

How do I measure the current power consumption?

Whilst you can't directly monitor the power consumption you can obtain information about the operating voltage of the: core (default), sdram_c, sdram_i, and sdram_p (see here for more details). ...
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12 votes
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Can I use the 3.3v pin instead of the 5v pin?

The HC-SR04 can only be run with 5v(scroll down to specs). However, you can easily fix your problem if you have a breadboard. Assign one row as the 5v "rail" and attach as many sensors as needed. ...
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12 votes

Why does the Raspberry Pi not have a power button?

It's NOT an "end-consumer" device, like an Apple TV or a DVR or a microwave. By analogy If you buy a car you expect it to come with door locks... Yes, but you know the manufacturer does not ...
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12 votes

Why do the Pi GPIO pins use/give 3.3V and not 5V?

Short answer is "Because that's the way it is designed". A somewhat longer answer is "They didn't make it 5V tolerant because it would be expensive". Nobody really mass-produces 5V peripherals ...
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12 votes

Can Rpi4B power external / portable USB HDD / SSD?

not able to power ... from a Raspberry pi 3 Here's why: Pi 3 was designed with USB 2.0 specs, including the 0.5 amp limit. Most hard drives require more current than that. Raspberry Pi 4 has USB 3.0,...
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