Show wapuu images on an LED matrix panel. Choose image by WP REST API.

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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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:BP 1BP DB BN
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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