sparkfun KIT-1432 Manuel utilisateur
Setting Up the Pi Zero Wireless Pan-Tilt
Camera
Introduction
This tutorial will show you how to assemble, program, and access the
Raspberry Pi Zero Wireless Pan-Tilt Camera.
Required Materials
You’ll need a microSD card, a sufficient power supply, and a micro-B USB
Cable. We do not recommend the pre-installed NOOBS card, as it may not
include a recent enough version of the Pi operating system to support the
Pi Zero W.
SparkFun Raspberry Pi Zero W Camera Kit
KIT-14329
microSD Card with Adapter -
16GB (Class 10)
COM-13833
USB micro-B Cable - 6 Foot
CAB-10215
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Required Tools
You’ll need a few tools to assemble this kit: just a standard soldering iron,
solder, a small screwdriver, and a pair of side cutters.
Suggested Reading
Very little of this kit requires anything but following our step-by-step guide;
however, you might want to check out our through hole soldering tutorial as
you’ll need to do some soldering to put the pins in place on the Pi Zero W
and the Pi Servo Hat. Other, tutorials you might be interested in reading
include:
Wall Adapter Power Supply -
5.1V DC 2.5A (USB Micro-B)
TOL-13831
Soldering Iron - 30W (US,
110V)
TOL-09507
Flush Cutters - Hakko
TOL-11952
Solder Lead Free - 15-gram
Tube
TOL-09163
Tool Kit - Screwdriver and
Bit Set
TOL-10865
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Prepare the MicroSD Card
To prepare the microSD card, we need to:
• Download the latest Raspberry Pi Raspbian Jessie image.
• Create an microSD card that contains this boot image.
• Edit the “config.txt” file on the microSD card to enable the serial
debug console.
• Create a “wpa_supplicant.conf” file on the SD card to enable WiFi.
Let’s walk through these steps in more detail!
Download the Latest Raspbian Jessie Image
You can find the image on the Raspberry Pi Foundation Website. It’s a
fairly large download so go get a snack or play a game or something.
Note: Make sure that you don't download "RASPBIAN XYZ LITE", as
the Lite installation is lacking several utilities and programs we'll need
to get things moving. Note that XYZ is a placeholder for the release
name of the distribution; at the time of this writing, that name is
"Stretch".
Burn the Image to an MicroSD Card
To write the image to the card, there exists an excellent utility for
Mac/Linux/Windows called Etcher. Simply download and install it to your
computer. Then select the image you downloaded earlier, the drive you
want to install to (Etcher won’t let you install to anything but a removable
drive, and if only one drive is available, it will select it automatically!), and
click “Flash!”
How to Solder: Through
-
Hole Solderin
g
This tutorial covers everything you
need to know about through-hole
soldering.
Hobby Servo Tutorial
Servos are motors that allow you to
accurately control the rotation of the
output shaft, opening up all kinds of
possibilities for robotics and other
projects.
Getting Started with the
Raspberry Pi Zero Wireless
Learn how to setup, configure and
use the smallest Raspberry Pi yet,
the Raspberry Pi Zero - Wireless.
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This is another long-ish process, requiring several minutes to complete.
Once complete, the window will display a “Flash Complete!” message.
By default, Etcher “ejects” the card after it has created the image, so you’ll
need to pull it out and reinsert it to get your computer to reload the disk.
Edit the “config.txt” File on the MicroSD Card
To continue, we’re going to need to edit a file on the microSD card. This file
will be visible from any operating system, although on a Linux system it’s in
a slightly different location.
On a Windows or Macintosh, the files will be loaded in the root directory of
the microSD card, so when you open a window of the drive, you’ll see them
directly. In Linux, the card will be mounted, and you’ll have to navigate to
the “Boot” directory on the card to find the file we’re looking for.
Here’s a list of all the files in the directory of interest.
Click the image for a closer look.
Open the file “config.txt” in your favorite text editor (i.e. Notepad++,
TextWrangler, ConTEXT Editor, etc.) and add this line to the very end:
enable_uart=1
Note: Despite the presence of a hash ('#') in front of the other lines in
this file, you must not put one in front of this line. That would
comment it out, causing it to be ignored. Adding this line will enable
the UART on the GPIO pins so you can complete the rest of the
process without having to hook your Pi Zero W up to a monitor and
keyboard. Pretty nifty!
Create a “wpa_supplicant.conf” File on the
MicroSD Card to Enable WiFi
The last thing we need to do to prepare the microSD card is to create a
“wpa_supplicant.conf” file on the card. This file contains the information
needed for your local wireless network setup.
Create a new file using your favorite text editor. On Windows we
recommend Notepad, as it provides WYSIWYG content and allows you to
save a file with an arbitrary file extension. On MacOS, TextWrangler seems
to be the easiest. For Linux, your default system text editor should be fine.
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The contents of the file can be quite simple. Most likely, you can get away
with something that looks like this:
network={
ssid="YOUR_SSID"
psk="YOUR_PASSWORD"
key_mgmt=WPA-PSK
}
Once added, modify the network ID and password for your WiFi network.
Then save the file as “wpa_supplicant.conf” to the microSD card.
Important Note: On the on the "Save As..." screen for Windows
users, you'll need to change the file extension type under the field
"Save as type:" from "*.txt file" to "All files". Then you will need to
explicitly name the file "wpa_supplicant.conf", or Notepad will
automatically append ".txt" to the file name, breaking this functionality.
See the image below.
Click the image for a closer look.
Some variation of this "Save as..." and removing the appended ".txt"
suffix is necessary in Mac OS and Linux as well, but should be equally
simple.
Pull the MicroSD Card and Insert It into the Pi
Zero W
This is all we need to do in preparation of our first boot. You can now
remove the card from your computer and put it into the Pi Zero W. Don’t
power it up yet, though!
Hardware Assembly
To assemble the hardware, we need to:
• Solder headers to the Raspberry Pi Zero W.
• Solder headers to the Pi Servo Hat.
• Install the Pi Servo Hat on the Pi Zero W.
• Assemble the pan-tilt hardware and connect the servos to the hat.
Let’s walk through these steps in more detail!
Solder Headers to the Raspberry Pi Zero W and
the Pi Servo Hat
We recommend soldering the male header to the Pi Zero W and the female
to the Pi Servo Hat. If you have any issues with soldering, please check out
our learn to solder tutorial.
Assemble the Pan-Tilt Mechanism
Assembly of the pan-tilt mechanism is fairly straightforward. The trickiest
part is making sure the servo motors are centered during assembly.
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Here’s the family portrait of the stuff that comes in the kit. You won’t be
needing the servo horns that come packaged with the servo motors, just
the ones that come packaged separately.
Start by identifying the servo horn with two long arms and two short arms.
You’ll need to clip off the long arms, as shown below.
Identify the smallest screws in the baggie of screws that came with the kit.
These will be used to affix this horn to the base of the pan-tilt mechanism.
Place the horn in the base as shown, then screw it down by inserting the
screws from the bottom and threading them into the horn. Note that there
will be extra screws, even beyond the ones to be used later. This is
generally true of all the screws in this set.
Next, identify the larger self-tapping screws. These will be used for
assembling the next part of the mechanism.
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Find the two pieces pictured below that will sandwich the first servo. Note
the orientation of the servo in these pieces.
Here’s the sandwiched servo. Again, note the orientation for proper
assembly.
Here, you can see where the screws identified a couple of steps ago fit into
our servo sandwich. Tighten them down, but not too much.
Now fit the shaft of the servo into the fitting on the horn that you previously
installed into the base. This is the point where you need to make sure that
the shaft is roughly centered in order for the entire assembly to work
properly. I do this by turning the shaft all the way to one extreme, then
turning it 90 degrees back in the other direction. Then, I remove the base
and line it up with the body of the servo motor.
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Find the two longer screws that came with the horn kit in the set. There will
likely be only two of these, and you need both, so don’t lose one!
You’ll now need the single arm servo horn, as shown in the image below on
the left.
Install the single arm servo horn as shown below. You’ll need two of the
small self-tapping screws from the first step to affix it to the mechanism.
You’ll now need the second servo motor and the last piece of the
mechanism. The image below shows the relative orientation of these two
pieces.
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Here’s a picture of the two pieces assembled to one another.
Now, find the longest machine screws in the baggie, as shown below. Once
again, you’ll find that there are more of these than you need.
Thread these screws through the stand off wings on the servo motor and
into the last piece of the mechanism. You can use nuts for these if you like,
but I’ve found it to be unnecessary as they thread into the mechanism quite
snugly without the nut.
Now connect the two major pieces of the assembly together. The image
below shows the orientation of these two parts.
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You may need to assemble and disassemble these two parts a couple of
times to find the right rotational position of the servo motor so that the tilting
portion has its full range of motion. Here’s an image of the two bits put
together.
Take the final screw that you identified above as a horn attaching screw
and use it to secure the horn to the servo motor.
Congratulations, you’ve finished assembly of the pan-tilt mechanism!
Solder the Headers onto the Pi Zero W and Pi
Servo Hat
We suggest soldering the male headers onto the Pi Zero W.
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