Join David Ross for an in-depth discussion in this video Select a power supply, part of Raspberry Pi: Home Monitoring and Control.
- Unlike a powered USB hub,…a power supply gives us the flexiblity…to mount the Raspberry Pi just…about anywhere there's a power outlet.…The basic requirements for the supply…are the voltage must be from 5.0 to 5.4 volts…even when drawing two apms of current.…With some cheaper power supplies,…the voltage will drop to 4.8 volts or less…when the current draw is two amps.…This may cause the Raspberry Pi to reset…since the voltage is too low…to properly keep the Pi running.…The maximum current should be at least be two amps.…As you add more things to the Raspberry Pi,…the current requirements will increase.…
Notably, the Wi-Fi connector will draw a lot of current.…The wire gauge should be at least 20 gauge…to safely carry two amps.…The lower the wire gauge number,…the greater the amount of current it can carry.…Some cheap power supplies can have 30 gauge wire…that will melt if you try to put two amps through it.…You must have a micro USB connector for your Raspberry Pi…because all Raspberry Pis have a micro USB connector…
This DIY electronics project provides simple directions for getting your home monitoring system up and running. Author David Ross helps you select a power supply, camera, motion detector, enclosure, and other components and accessories, and make your system "smart" by connecting to web services frameworks such as Weaved and WebIOPi. Then he helps you program the logic to make your Pi camera take pictures and stream video, connect to home peripherals, and mount your alarm system. With this training, and a little elbow grease, you can create a fully autonomous system that helps you and your family feel more secure at home and away.
Note: These instructions work with Raspberry Pi B, Raspberry Pi B+, and Raspberry Pi 2 models.
- Selecting hardware, including a Raspberry Pi camera and a Pi Cobbler
- Configuring VNC, SSH, and WebIOPi services
- Sending SMS messages with the Raspberry Pi
- Taking and accessing pictures remotely
- Setting up video streaming with a Raspberry Pi camera
- Connecting the Pi to the development board
- Connecting the relay and motion detector
- Programming the alarm in Python
- Mounting and securing the alarm system