This tutorial will show you how to install the Mote Python library, and then walk through its functionality, finishing with an example of how to use Mote with Cheerlights.
We always recommend using the most up-to-date version of Raspbian, as this is what we test our boards and software against, and it often helps to start with a completely fresh install of Raspbian, although this isn't necessary.
As with most of our boards, we've created a really quick and easy one-line-installer to get your Mote set up. We'd suggest that you use this method to install the Mote software.
Open a new terminal, and type the following, making sure to type 'y' or 'n' when prompted:
curl https://get.pimoroni.com/mote | bash
Once that's done, it probably a good idea to reboot your Pi to let the changes propagate.
On Mac or Linux, to install the Mote Python library with pip, open a terminal and type the following:
sudo pip install mote
That should install the Mote library. Alternatively, if you want to clone the Mote GitHub repo, including all of the examples, then open a terminal and type the following:
git clone https://github.com/pimoroni/mote cd mote/python/library sudo python setup.py install
If you've installed Python for Windows, then it comes with the pip installer, and you should be able to use it to install the Mote Python library. Open a command prompt and type:
pip install mote
If you've got the Mote kit, then you'll have four of the Mote strips, a controller, four Mote cables (the black ones with micro-B connectors), and a USB cable (the red one, USB A to micro-B).
The Mote cables are used to connect the Mote strips to the controller board. Plug either end of the cable into the micro-B connector on a Mote strip, and the other end into one of the four numbered ports on the Mote controller board. Do this for all four strips (assuming you want to use all four).
The red USB cable plugs into the port on the controller marked with the USB symbol (the micro-B end of the cable). Plug the other end of the USB cable (the larger A connector) into a free USB port on your computer.
The remaining port on the controller, marked with the lightning bolt power symbol, can be used to supply extra power to the Mote strips provided by a micro-USB power supply, to take them to full brightness. You can safely plug this additional power supply in and out while your Mote strips are connected and running quite safely.
In terms of functionality, the Mote library works very similarly to our Blinkt!
Python library. However, instead of just 8 pixels on Blinkt!, Mote has up to
4 x 16 pixels per controller. So, the
set_pixel method for Mote, takes an
additional argument that specifies which channel (and hence strip) to act on.
Before we get to the
set_pixel method, we need to import the
create an instance of the class on which to work, and set up the 4 channels.
Let's do that now.
from mote import Mote mote = Mote() mote.configure_channel(1, 16, False) mote.configure_channel(2, 16, False) mote.configure_channel(3, 16, False) mote.configure_channel(4, 16, False)
mote.configure_channel takes three arguments - a channel from 1 to 4, the
number of pixels on that channel, and a
False that specifies whether
to enable gamma correction or not. We're assuming here that you're using four
of the sixteen pixel strips but, if not, you can modify the code accordingly for
the number of strips and pixels per strip you have.
To start, we're going to light the first pixel of the first strip red. The
set_pixel method takes five arguments - the strip number, pixel number, and
the red, green and blue values (from 0-255). In RGB, red is represented as 255,
mote.clear() mote.set_pixel(1, 0, 255, 0, 0) mote.show()
You'll notice that we also called
mote.clear() before we set the pixel, just
in case there were any pixels already set. It's also worth noting that the
strips are numbered from 1 to 4, but the pixels on each strip are indexed from
0 and hence numbered from 0 to 15. After setting a pixel or pixels, you have to
mote.show() to actually display the set pixels on the Mote strips.
Next, we'll light all of the pixels on all four strips blue. To do this, we'll
for loops, that will first loop through each strip, and then through
each pixel on each strip, setting each one in turn.
mote.clear() for channel in range(1, 5): for pixel in range(16): mote.set_pixel(channel, pixel, 0, 0, 255) mote.show()
Notice that we're using
range(1, 5) for the
channel, since we want the
numbers 1 to 4 (ranges in Python go up to, but do not include the second
number), but we're using
range(16) for the
pixel since the 0 is implicit
when only a single number is passed to
Now that we know how to light individual pixels and iterate through all of the pixels, we'll look at how to do some basic animations.
By rejigging our code that we used in the previous section to light all of the pixels, we can create a simple animation that fills up all of the pixels on the strips one at a time.
import time while True: mote.clear() for channel in range(1, 5): for pixel in range(16): mote.set_pixel(channel, pixel, 0, 0, 255) mote.show() time.sleep(0.05)
We need to import an additional library, the
time library, that allows us to
add a small delay to our animation (the last line that reads
The only other changes we'll make are to wrap the whole thing in a
loop to keep it running continuously, and move the
mote.show() into the
for loop so that the Mote strips update after each pixel is lit.
To change this animation so that a single pixel scans across all of the strips,
all we have to do is to move the
mote.clear() to the start of the
where the pixels are lit, meaning that any existing pixels that are lit will be
cleared before a new one is lit.
import time while True: for channel in range(1, 5): for pixel in range(16): mote.clear() mote.set_pixel(channel, pixel, 0, 0, 255) mote.show() time.sleep(0.05)
Cheerlights is a really simple web service that allows anyone to change the
colour that is currently set, from a range of about a dozen different colours,
@cheerlights green, for example, or
By pulling the currently set colour from the Cheerlights API, every so often,
we can use that to change the colour of our Mote strips.
We'll go through the code bit by bit, and explain it along the way.
import requests import time from mote import Mote mote = Mote() mote.configure_channel(1, 16, False) mote.configure_channel(2, 16, False) mote.configure_channel(3, 16, False) mote.configure_channel(4, 16, False)
Most of this code looks similar to the code that we ran at the very beginning
of the tutorial, to set up the Mote strips. We've additionally imported the
requests library, that we'll use to query the Cheerlights API.
Before the main
while loop that will run our code, we'll clear the Mote strips
mote.clear() and then
And here's the
while True loop that will run every second, query the
Cheerlights API, and then update our Mote strips accordingly.
while True: r = requests.get('http://api.thingspeak.com/channels/1417/field/2/last.json') col = r.json()['field2'] r, g, b = tuple(ord(c) for c in col[1:].lower().decode('hex')) for channel in range(1, 5): for pixel in range(16): mote.set_pixel(channel, pixel, r, g, b) mote.show() time.sleep(1)
We're using the
requests library to send a GET request to the Cheerlights API:
r = requests.get('http://api.thingspeak.com/channels/1417/field/2/last.json').
If we look at the JSON returned by that request, we see something that looks
like the following.
If you don't already have the
requests library installed, you can install it
by typing the following in the terminal.
sudo pip install requests
field2 is the colour, in this case
#800080, which is purple. In the next
line, we use the
.json() method of our returned request
r to then pull out
['field2'] with the hex colour value.
set_pixel method accepts RGB values, and we have a hex value,
we'll use a bit of slightly clunky tuple interpretation to convert hex to
b values all in one line.
r, g, b = tuple(ord(c) for c in col[1:].lower().decode('hex'))
And then it's just a matter of looping through the channels and pixels, as we
did previously, setting the pixels, and then calling
mote.show(), with a
second delay so that we don't hit their API with too many requests.
for channel in range(1, 5): for pixel in range(16): mote.set_pixel(channel, pixel, r, g, b)
Here's the entire code that you can save in a file called
or some such, and then run in the terminal.
import requests import time from mote import Mote mote = Mote() mote.configure_channel(1, 16, False) mote.configure_channel(2, 16, False) mote.configure_channel(3, 16, False) mote.configure_channel(4, 16, False) mote.clear() mote.show() while True: r = requests.get('http://api.thingspeak.com/channels/1417/field/2/last.json') col = r.json()['field2'] r, g, b = tuple(ord(c) for c in col[1:].lower().decode('hex')) for channel in range(1, 5): for pixel in range(16): mote.set_pixel(channel, pixel, r, g, b) mote.show() time.sleep(1)
We've designed Mote to work really well as a decorative light for under-shelf, or under-cabinet lighting, and we've also written a really neat (if quite lengthy) tutorial about how to control Mote with Homekit and Siri (for voice control) on the iPhone.
Why not combine Mote with an Enviro pHAT or the Flotilla Light module, and use it to turn Mote on automatically when it gets dark? Or you could use Display-O-Tron HAT as an all-singing all-dancing controller for Mote!
Our Mote strips also fit perfectly in IKEA's Kallax shelving units, and we'll have a tutorial and mounting template very soon to show you how to do it.
Need something for this project? You can use the links below to add products to your Pimoroni Shop basket for easy checkout.
Complete Kit (Host + 4 Sticks + Cables) £40.00
Raspberry Pi Universal Power Supply