1. The document discusses setting up a Raspberry Pi to display images on an LED matrix using the REST API in WordPress. 2. Code is provided to register routes to set and get the image ID and functions to update the image ID in the database and return it. 3. A Python script is shown to call the API, get the image ID, and display the corresponding image on the LED matrix periodically.

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git libgraphicsmagick++-dev libwebp-dev

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$ git clone https://github.com/
hzeller/rpi-rgb-led-matrix
$ cd rpi-rgb-led-matrix
$ make -C examples-api-use
$ cd utils
$ make led-image-viewer

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$ cd example-api-use
$ sudo ./demo
--led-gpio-mapping=adafruit-hat
--led-no-hardware-pulse
--led-chain=4 -L
-D 0

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$ sudo ./demo
--led-gpio-mapping=adafruit-hat
--led-no-hardware-pulse
--led-chain=4 -L
-D 1 ../../images/wapuu.ppm

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/wp-json/wapuu/v1/set/nnn
/wp-json/wapuu/v1/get

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add_action( 'rest_api_init', function () {
register_rest_route( 'wapuu/v1', '/set/(?P<id>d+)', array(
'methods' => 'POST',
'callback' => 'set_wapuu_image',
'args' => array(
'id' => array(
'validate_callback' => function($param, $request, $key) {
return is_numeric( $param );
}
),
),
) );
register_rest_route( 'wapuu/v1', '/get', array(
'methods' => 'GET',
'callback' => 'get_wapuu_image',
) );
} );

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function set_wapuu_image( $data ) {
$id = $data['id'];
update_post_meta( 60, 'wapuu-image', $id );
$data = array( 'id' => $id );
return new WP_REST_Response( $data, 200 );
}
function get_wapuu_image() {
$id = get_post_meta( 60, 'wapuu-image');
$data = array( 'id' => $id );
return new WP_REST_Response( $data, 200 );
}

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http://example.net/wp-json/
wapuu/v1/get
{"id":"001"}

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api="http://example.net/wp-json/wapuu/v1/get"
def img_number():
try:
html = urllib.urlopen( api ).read()
except:
return None
data = json.loads(html)
return data['id']

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image_dir = "~/wapuu/"
viewer = "~/rpi-rgb-led-matrix/utils/led-image-viewer"
opt = " --led-daemon --led-gpio-mapping=adafruit-hat" +
" --led-no-hardware-pulse --led-chain=4 -L"
prev = None
while True:
time.sleep(2)
number = img_number()
if number is None: continue
files = glob.glob(image_dir+number+"-*.png")
if len(files) < 1: continue
if files[0] == prev: continue
if prev is not None: kill_img()
commands.getstatusoutput("sudo "+viewer+opt+files[0])
prev = files[0]

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pattern = r"^ *(d+) .*/led-image-viewer"
def kill_img ():
id = []
ps_list = commands.getoutput('ps awx')
for process in ps_list.split("n"):
match = re.match(pattern, process)
if not match: continue
id.append(match.group(1))
commands.getoutput("sudo kill "+" ".join(id))

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<form method="post"
action="/wp-json/wapuu/v1/set/001">
<div>[caption id="attachment_40"
align="alignleft" width="150"]
<img src="/wp-content/uploads/
2017/09/001-original-150x150.png"
alt="001" width="150" height="150"
class="size-thumbnail wp-image-40" />
Original (WordCamp 2011 Fukuoka)<br>
<button type="submit" value="001">
Submit</button>
[/caption]</div></form>

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39. http://www.yuriko.net/
@lilyfanjp
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