IoT Raspberry Pi security camera running OpenCV for object detection. The camera will send an email with an image of any objects it detects.
Check out this video to see a summary of the build steps and the completed camera:
Building the Housing
The housing consists of two components made from 1/4″ (really 0.22″ – 0.23″) medium density fiber (MDF) board. A bottom portion holds the camera and Raspberry Pi Zero in place, and a top portion attaches to the mounting bracket. We drew out some basic designs with a few holes to mount the components. Schematics of the upper and lower portions of the housing with exact dimensions can be found in the “Schematics” section, but you may want to vary your dimensions based on the parts and hardware available to you.
Cutting and Gluing the Housing
Once we had our basic design, we created some paper templates to cut the MDF board. Paper templates aren’t needed to cut the MDF board, but we found that it was easier to position the parts on the board. They can also be saved for later and used to build another camera if you make a mistake while cutting. The exact measurements for this template can be found in the attachments section below. Trace and cut out each piece, being sure to label them. Then trace the template pieces onto the MDF board.
Using an electric jigsaw, cut out each piece of the housing. Be sure to wear safety glasses, cut in a well ventilated area, and wear a breathing mask. The fine dust generated is not good for you. All the dust also tends to cover up the traced line and makes it hard to see where to cut. We found it really helps to have a second person vacuum up the dust as you cut. You can also use an air compressor to blow it away if you have one.
Assemble the pieces together using wood glue according to the schematics. Use clamps to help you hold them in place while the wood dries.
Drilling Lots of Holes
Get ready to drill.
For the camera mounting holes, because there are four small holes for mounting, you want to be very careful when measuring and marking the hole locations on the front face of the housing. We found the camera mounting holes form a 21.7 mm x 13.3 mm rectangle. Line the actual camera module up with your marked holes to be sure they are in the proper location.
After marking the holes, use a small drill bit to drill 4 pilot holes in those locations. Then drill through with a 7/64″ drill bit. In the video, you’ll see us drilling counterbores at these locations too for the screw heads to fit in. But this isn’t necessary if you bought long enough M2.5 screws, unlike us.
The hole for the camera lens takes three steps because the camera lens does not sit flush with the rest of the circuit board and needs a place to fit in when mounted up against the housing.
First, drill a pilot hole exactly in the center of the two top camera mounting holes. Then, flip the housing over and use a 1/2″ drill to drill a counterbore on the inside face just deep enough for the lens to sit in. Go very slowly when drilling the counterbore because it’s easy to go straight through the housing. Practicing on a scrap piece is highly recommended. Lastly, you can use the same pilot hole to drill all the way through with a 5/16″ drill bit.
Now we need to drill a hole for the micro-USB power cable to go through. Since the upper housing will cover the sides of the lower housing, we need to drill the same hole in the same location on both portions of the housing.
Line the Raspberry Pi up in the lower portion of the housing with the ribbon cable port at the back of the housing so that the cable won’t crease or bend too much. Then, mark the location of the micro-USB power port on the side of the housing. On the side of the housing, mark the vertical position of this hole as close to the inside bottom surface of the housing as possible without allowing the 1/2″ drill you will use to hit the bottom of the housing; this is because the power port on the Pi will sit very close to the bottom, and you don’t want your hole too high.
Mark a corresponding hole location on the upper housing, and make sure they line up when you put them together. Next, clamp the upper and lower housing together and drill straight through both pieces with a small drill to form pilot holes. After double checking the holes are in the right place, use the pilot holes to drill through with a 1/2″ drill.
And now, finally, more holes! Line your metal mounting bracket up with the upper portion of your housing and find a hole to use as your pivot point. Make sure there is plenty of travel space as you pivot the bracket around. Also make sure it is high enough to not interfere with the sides of the bottom housing. Mark this location and drill a hole of an appropriate size to match the hole in your bracket. In our case, we used an 11/64″ drill to fit a #8 screw.
Okay, these are actually the last holes you need to drill. We need to be able to attach the upper housing to the lower housing. We chose to place two hex nuts inside one wall of the lower housing, allowing the outer housing to be screwed into the lower housing using these nuts. Drill two holes on the side of the lower housing with a 5/16″ drill bit, making sure they are placed high enough that inserted screws will not run into the Raspberry Pi.
Now that all the holes are drilled, paint the housing with black spray-paint (or whatever you want) to make it look nice.
Almost there. The metal mounting bracket for the camera is attached so that the angle of the camera can be easily adjusted. Slip a #8 x 3/4″ screw through the 11/64″ pivot hole in the upper housing from the inside, and secure it in place with a #8 hex nut on the outside.
Then slip the metal bracket onto the screw on top of the hex nut, and hold it in place with a #8 wing nut. The wing nut allows you to easily loosen the bracket, adjust the angle, and re-tighten.
To mount the hex nuts into the holes of the bottom portion of the housing, use a cotton swab (or a piece of paper if you don’t have one) to coat the inside surface of the holes. Then carefully slide the M4 hex nuts into the holes and allow them to dry. Be careful not to get much glue onto the threads of the hex nuts, and wipe off any excess glue.
The housing is now complete!
Using four M2.5 screws, screw the camera onto the front piece of the housing. We found that M2.5 screws actually threaded into the holes of the camera module slightly, so no tiny nuts were required. Then, plug the ribbon cable of the camera module into the video port on the Raspberry Pi.
Place the Raspberry Pi into the housing with the ribbon cable port facing the back end of the housing. This allows the ribbon cable to arc smoothly from the camera module across the housing to the Raspberry Pi.
Being careful not to pinch or crease the ribbon cable, slide the upper housing onto the lower housing.
Finally, screw the two portions of the housing together using two M4 x 20 mm screws, and plug in the micro-USB cable.
Congratulations! You’ve put together your own security camera. Now you’re ready to make it a smart security camera.
This project uses a Raspberry Pi Camera to stream video. Before running the code, make sure to configure the Raspberry Pi camera on your device.
Open the terminal and run
Select Interface Options , then Pi Camera and toggle on. Press Finishand exit.
You can verify that the camera works by running
raspistill -o image.jpg
which will save a image from the camera in your current directory. You can open up the file inspector and view the image.
This project uses openCV to detect objects in the video feed. You can install openCV by using the following tutorial. I used the Python 2.7 version of the tutorial.
The installation took almost 8 hours (!!) on my Raspberry Pi Zero, but it would be considerably faster on a more powerful board like the Raspberry Pi 3.
The tutorial will prompt you to create a virtual environment. Make sure you are using the virtual environment by typing the following commands
Next, navigate to the repository directory
and install the dependencies for the project
pip install -r requirements.txt
To get emails when objects are detected, you’ll need to make a couple modifications to the mail.py file.
Open mail.py with vim vim mail.py , then press i to edit. Scroll down to the following section
# Email you want to send the update from (only works with gmail)
fromEmail = ‘[email protected]’
fromEmailPassword = ‘password1234’
# Email you want to send the update to
toEmail = ‘[email protected]’
and replace with your own email/credentials. The mail.py file logs into a gmail SMTP server and sends an email with an image of the object detected by the security camera.
Press esc then ZZ to save and exit.
Read More Detail :Smart Security Camera