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62 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 ...
zertyz's user avatar
  • 741
46 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 ...
Ricardo's user avatar
  • 1,048
35 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 ...
Milliways's user avatar
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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 ...
goldilocks's user avatar
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30 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 ...
lewiatan's user avatar
  • 713
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 ...
Roel Baardman's user avatar
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 ...
Ghanima's user avatar
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22 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. ...
Seamus's user avatar
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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 ...
goobering's user avatar
  • 10.7k
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 ...
Patrick Cook's user avatar
  • 6,365
17 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 ...
Ghanima's user avatar
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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 ...
Ingo's user avatar
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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-...
Milliways's user avatar
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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 ...
axslinger's user avatar
  • 151
14 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 ...
Milliways's user avatar
  • 60.5k
13 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 ...
Dmitry Grigoryev's user avatar
13 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,...
Botspot's user avatar
  • 1,779
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). ...
Pierz's user avatar
  • 844
12 votes
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What are the max current rating for 3.3v and 5v rail of the Rpi 4B

You will not find a specification, because there isn't one. The Pi4 has the same power manager as the Pi3B+ and Pi3A+ so the current limitation would be the same (the PMIC is rated at 1.5A). The Pi3 ...
Milliways's user avatar
  • 60.5k
11 votes

Is this idle temperature normal for the RPi 3?

I have eight pi3s in a room which is 22-24°C. They range in temperature between ~45°C and ~50°C when idle, with each pi being fairly consistent in temperature +-2°C (sorry, not terribly accurate ...
Craig's user avatar
  • 606
11 votes

Choosing a Pi4 power supply

Use a PoE Hat: Third-party USB-C charging devices can be cheaply wired, potentially destroying connected devices as well as starting fires. A safer alternative is to power your Pi using PoE which ...
F1Linux's user avatar
  • 1,667
10 votes
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Does Raspberry Pi Zero have a polyfuse?

The Pi Zero does not have a fuse (polyfuse or otherwise). See this Raspberry Pi org forum post. Also see these limited schematics.
joan's user avatar
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10 votes
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Shorted 3.3v + 5v together. Is it possible to repair?

A little instruction for people who want to resolder MXL7704-R3. Order in aliexpress MXL7704-R3 (2.5$ - 3.5$). You must have hot air rework station which can heat up to 350 degrees Celsius to remove ...
snex's user avatar
  • 264
10 votes
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Power LED from 3.3V Power Pin without Resistor

You need to consider that the forward voltage of a white LED is likely in the range of 3.0 V to 3.2 V (according to the linked article). Assuming the best case of 3.0 V and a resistor of 330 Ohms and ...
Ghanima's user avatar
  • 15.9k
10 votes

Constant undervoltage, despite meter showing otherwise

Get a better cable. Most PSUs guarantee the voltage only on the USB-Port. If you use the official Rasperry Pi PSU on the other hand, it guarantees your the voltage on the Micro USB plug. Depending on ...
kwasmich's user avatar
  • 2,702
9 votes

Does Raspberry Pi Zero have a polyfuse?

NO polyfuse for raspberry pi zero Thanks to Joan I got the information to complete this request. Here are the schematics for the power supply of both raspberry pi Zero and PRI 3, . Raspberry Pi Zero ...
Stowoda's user avatar
  • 446
9 votes
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Choosing a Pi4 power supply

The best option is a good quality power supply, as cheap brands may say they are rated at 2.4 amps, when they don't actually supply that much. Based on the numerous bad experiences i've had with 3rd ...
nikodean2's user avatar
  • 180
8 votes

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

Power Consumption Benchmarks The instrument used to measure power consumption with the Dramble and individual Raspberry Pis: PowerJive USB Power Meter In all measurement cases, nothing is plugged ...
Raghav Dinesh's user avatar
8 votes
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Can I power a Raspberry Pi 3 with a Smart TV's USB-Port?

According to the Raspberry Pi FAQ on Power requirements ( which can be found here --> https://www.raspberrypi.org/help/faqs/#powerReqs ): Maximum draw from USB = 1.2A Recommended Power Source =...
Jaxian's user avatar
  • 206
8 votes
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Cannot connect to PiCamera when using it with Flask

I struggled for some time with this exact same problem. I believe that I've solved it, though I have to be honest, I don't understand exactly why it works. The key was turning off debugging in Flask. ...
Nick's user avatar
  • 96

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