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This setup shows how to create a baby sleep monitor which is able to stream a low latency image stream from a Raspberry Pi to a computer with some additional features:
- Audio/video streaming from the Raspberry Pi to a browser.
- Motion detection (via the camera and the optional oximeter probe) to detect when the baby wakes up.
- It also works with a Massimo oximeter to monitor O2 and heart rate sats.
You can also use it only as a basic audio/video streaming web-cam (#1 above) or as a audio/video streaming + motion detection (#1 + #2) above.
Depending on how old your Raspberry Pi is, you might need to do an apt-get update/upgrade in order to be able to compile Janus (which is not available on apt as of this writing). On a terminal:
sudo apt-get update
sudo apt-get upgrade
This takes a while, so be patient.
First enable Raspberry Pi camera in the firmware:
sudo raspi-config
# Once the UI comes up, select the following options
# Choose (5) Interfacing options
# Choose (P1) Camera
# Choose <Yes>
# Finish
(Optional) Disable the bright red LED
sudo nano /boot/config.txt
# Add the following line to the end:
disable_camera_led=1
In order to read the Masimo oximeter using a serial to USB cable, you need to disable console login over serial. To do this:
sudo raspi-config
# Choose Interfacing Options > Serial
# Choose <No> For "Should login shell be accessible over serial?"
# Choose <Yes> for "Would you like serial port hardware to be enabled?"
Now download and build this repo.
NOTE: The build.sh script below will modify /etc/rc.local etc. Please give it a quick read if you are uncertain.
cd ~
mkdir code && cd code
git clone https://github.com/srinathava/raspberry-pi-sleep-monitor.git
cd raspberry-pi-sleep-monitor
./build.sh
Reboot. Note that the sleep monitor will automatically start after a reboot because /etc/rc.local is modified to automatically invoke it. Please do not change the location at which you download the repo because some of the paths are hard-coded into the init scripts.
Note: This is optional and can be skipped if you wish to use this setup only as a webcam.
You will need to ensure that the serial output format for the Oximeter is set to "AS1". From the manual, this is done by:
To access Level 3 parameters/measurements, hold down the Enter Button
and press the Down Button for 5 seconds. After entering menu Level 3,
use the Up or Down button to move between settings.
When you see the top panel says "SEr", you will want to press up till the bottom panel says AS1. Then press enter to select that.
IMPORTANT: Ensure that you only change this setting. Changing other settings can be a safety hazard and could compromise the functioning of the oximeter.
Now connect the Oximeter to the Raspberry Pi using a serial to USB cable such as "UGREEN USB 2.0 to RS232 DB9 Serial Cable Male A Converter Adapter...". Although this cable seems to work, I've found it doesn't really tighten nicely to the back of the Oximeter. If you know of a better cable, let me know.
Now from any other computer in the local network, navigate to:
http://192.168.1.4/
(Replace the IP address with the Raspberry Pi's actual IP address)
NOTE: If you have avahi-daemon running on your Raspberry Pi (it is by default), then on another computer which supports ZeroConf, you can also directly type:
http://raspberrypi.local/
and skip the numeric IP address. Note that MacOS supports zeroconf by default. On Windows, if you have some popular software installed such as Skype, iTunes (shudder) etc., it might also work. Apparently installing Bonjour print services on Windows also pulls in Zeroconf. On Linux, it should be a simple matter of running avahi-daemon on it as well.
If you wish to use it as a basic IP web-cam (with audio streaming) without bothering with the oximeter readings/motion detection, you can use the URL:
http://raspberrypi.local/cam.html
If you want only the audio/video stream + motion detection, use:
http://raspberrypi.local/motion.html