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Elecrow-RD / CrowPi2

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"Low Voltage Warning" indication when powering through the 5V USB Power Supply Port #18

Closed Pearl-852 closed 3 years ago

Pearl-852 commented 3 years ago

The Lightning Bolt (Low voltage warning) icon appears constantly when powering the CrowPi2 through a 5V/3A Power Bank or Power Adapter.

Below are some voltage measurement comparisions that I took,

  1. Using the included 12V/2A Adapter, 5V@GPIO = 5.22V
  2. Using a 5V/3A Power Bank, the input voltage = 5.12V and the 5V@GPIO = 4.74V
rabagliati commented 3 years ago

You need a short, thick (high current) USB cable between the power bank and Crowpi2.

At 12V, my Crowpi2 draws 0.54 Amps. At 5V, it will draw over 1.3 amps.

My suggestion:- Just use the 12V barrel connector.

Elecrow-RD commented 3 years ago

The Lightning Bolt (Low voltage warning) icon appears constantly when powering the CrowPi2 through a 5V/3A Power Bank or Power Adapter.

Below are some voltage measurement comparisions that I took,

  1. Using the included 12V/2A Adapter, 5V@GPIO = 5.22V
  2. Using a 5V/3A Power Bank, the input voltage = 5.12V and the 5V@GPIO = 4.74V

Yes, the low voltage warning icon will appear when using the power bank to power the CrowPi2. This is related to the relatively large power consumption of the Raspberry Pi 4 and the many sensors on the board, but this is a normal phenomenon and will not affect the normal trial.

Pearl-852 commented 3 years ago

I cannot imagine with your reply that "This is a normal phenomenon and will not affect the normal trial."

Here are the official documentation from Raspberry Pi Foundation on this subject.

Power Supply Warnings On all models of Raspberry Pi since the Raspberry Pi B+ (2014) except the Zero range, there is low-voltage detection circuitry that will detect if the supply voltage drops below 4.63V (+/- 5%). This will result in a warning icon being displayed on all attached displays and an entry being added to the kernel log.

If you are seeing warnings, you should improve the power supply and/or cable, as low power can cause problems with corruption of SD cards, or erratic behaviour of the Pi itself; for example, unexplained crashes.

Reference link: https://www.raspberrypi.org/documentation/hardware/raspberrypi/power/README.md

So, I cannot agree that "This is normal and will not affect the normal usage."

In my opinion, and sorry to say, "This is a simple case of failed engineering design." Because this symptom appears constantly and not intermittently. And these warning instances are all being logged in the Kernel log. I cannot believe this symptom was not observed during your product development.

With all said, I really liked the CrowPi2 concept and hope the future model is better improved.