1  # SPDX-FileCopyrightText: 2017 Scott Shawcroft, written for Adafruit Industries
 2  # SPDX-FileCopyrightText: Copyright (c) 2021 Jeff Epler for Adafruit Industries
 3  #
 4  # SPDX-License-Identifier: Unlicense
 5  
 6  """
 7  This exampl us for the Espressif Soala Wrover with an OV2640 Camera
 8  
 9  This example requires that your WIFI and Adafruit IO credentials be configured
10  in CIRCUITPY/secrets.py, and that you have created a feed called "image" with
11  history disabled.
12  
13  The maximum image size is 100kB after base64 encoding, or about 65kB before
14  base64 encoding.  In practice, "SVGA" (800x600) images are typically around
15  40kB even though the "capture_buffer_size" (theoretical maximum size) is
16  (width*height/5) bytes or 96kB.
17  """
18  
19  import binascii
20  import ssl
21  import time
22  from secrets import secrets  # pylint: disable=no-name-in-module
23  
24  import board
25  import busio
26  import wifi
27  import socketpool
28  import adafruit_minimqtt.adafruit_minimqtt as MQTT
29  from adafruit_io.adafruit_io import IO_MQTT
30  import adafruit_ov2640
31  
32  feed_name = "image-saola-ov2640"
33  
34  print("Connecting to WIFI")
35  wifi.radio.connect(secrets["ssid"], secrets["password"])
36  pool = socketpool.SocketPool(wifi.radio)
37  
38  print("Connecting to Adafruit IO")
39  mqtt_client = MQTT.MQTT(
40      broker="io.adafruit.com",
41      username=secrets["aio_username"],
42      password=secrets["aio_key"],
43      socket_pool=pool,
44      ssl_context=ssl.create_default_context(),
45  )
46  mqtt_client.connect()
47  io = IO_MQTT(mqtt_client)
48  
49  bus = busio.I2C(scl=board.IO7, sda=board.IO8)
50  cam = adafruit_ov2640.OV2640(
51      bus,
52      data_pins=(
53          board.IO36,
54          board.IO37,
55          board.IO41,
56          board.IO42,
57          board.IO39,
58          board.IO40,
59          board.IO21,
60          board.IO38,
61      ),
62      clock=board.IO33,
63      vsync=board.IO2,
64      href=board.IO3,
65      mclk=board.IO1,
66      mclk_frequency=20_000_000,
67      size=adafruit_ov2640.OV2640_SIZE_QVGA,
68  )
69  
70  cam.flip_x = False
71  cam.flip_y = False
72  
73  cam.size = adafruit_ov2640.OV2640_SIZE_SVGA
74  cam.colorspace = adafruit_ov2640.OV2640_COLOR_JPEG
75  jpeg_buffer = bytearray(cam.capture_buffer_size)
76  while True:
77      jpeg = cam.capture(jpeg_buffer)
78      print(f"Captured {len(jpeg)} bytes of jpeg data")
79  
80      # b2a_base64() appends a trailing newline, which IO does not like
81      encoded_data = binascii.b2a_base64(jpeg).strip()
82      print(f"Expanded to {len(encoded_data)} for IO upload")
83      io.publish(feed_name, encoded_data)
84      print("Waiting 10s")
85      time.sleep(10)