A digital frame powered by the Raspberry Pi Pico, displays a piece of Reddit's r/place canvas at a random position.
- Raspberry Pi Pico W
- Waveshare 3.7inch 480×280 E-Paper Display, 4 Grayscale
The canvas needs to be preprocessed before feeding it to Pico. Ensure you have ImageMagick installed. Download the canvas from https://www.reddit.com/r/place/comments/15bjm5o/rplace_2023_data/ and execute the following command from the command line:
magick convert final_2023_place.png -dither FloydSteinberg -define dither:diffusion-amount=85% -remap eink___epaper_eink-4color.png -type truecolor BMP3:!!final_2023_place_encoded.bmp
Execute the following script to convert the resulting BMP into the color sequence to be fed to Pico:
python canvas_transformer.py input_bmp_file output_file height width
RP Pico doesn't have enough memory to store the entire canvas. This is why the solution is divided into two parts: the server and the client sides. The server part can be hosted on a Raspberry Pi Zero W using Flask framework:
@app.route('/picture', methods=['GET'])
def picture():
f = open('/home/pi/final_2023_place_color_sequence.txt', 'r')
real_w = 6000 #image width
x = request.args.get('x', default = 0, type = int)
y = request.args.get('y', default = 0, type = int)
w = request.args.get('w', default = 1, type = int)
h = request.args.get('h', default = 1, type = int)
page = request.args.get('page', default = 0, type = int)
totl = request.args.get('totl', default = 1, type = int)
res = ''
f.read(x * real_w + y)
for i in range (0, h):
res += f.read(w)
f.read(real_w - w)
f.close()
p_size = int(len(res) / totl)
last_size = p_size + len(res) - p_size * totl
if page >= totl - 1:
return res[-last_size:]
return res[page * p_size:page * p_size + p_size]Amend main.py with your WiFi SSID and password, update the server-side URL, and save the file on the Pico.
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