If you've seen my first video on Pi Zero testing, I was unable to test current draw because the Pi was defective. No problem! I've received two more Zeros and can start testing with some realistic results. The Pi Zero is expected to use less power than the Raspberry Pi A+ and B+, but I also want to try and get that down some more. The biggest power consumers with the Pi Zero is going to be with the HDMI, Power/Activity Light, and USB. The USB is easy to reduce, I just don't plug anything in that I don't need. I'll be using a WiFi adapter with my PiZero, but only when I need to make changes. If this Pi goes into a battery powered project there will be no need for USB, HDMI, or that LED.
I'm very pleased with the results, here they are:
So, how do you disable the HDMI? That's very easy to do. Run this command:
You can also add this to your /etc/rc.local file to make this happen everytime you reboot. Use -p instead of -o to reenable HDMI.
DISABLE PWR / ACTIVITY LED
To disable the led on the Pi Zero add the following to the bottom of your /boot/config.txt file:
|# Disable the Activity / PWR LED (PiZero).