1  import time
 2  import board
 3  import busio
 4  from digitalio import DigitalInOut
 5  from digitalio import Direction
 6  
 7  # ESP32 SPI
 8  from adafruit_espatcontrol import (
 9      adafruit_espatcontrol,
10      adafruit_espatcontrol_wifimanager,
11  )
12  
13  
14  import neopixel
15  import adafruit_fancyled.adafruit_fancyled as fancy
16  
17  
18  # Get wifi details and more from a secrets.py file
19  try:
20      from secrets import secrets
21  except ImportError:
22      print("WiFi secrets are kept in secrets.py, please add them there!")
23      raise
24  
25  
26  # With a Particle Argon
27  RX = board.ESP_TX
28  TX = board.ESP_RX
29  resetpin = DigitalInOut(board.ESP_WIFI_EN)
30  rtspin = DigitalInOut(board.ESP_CTS)
31  uart = busio.UART(TX, RX, timeout=0.1)
32  esp_boot = DigitalInOut(board.ESP_BOOT_MODE)
33  esp_boot.direction = Direction.OUTPUT
34  esp_boot.value = True
35  status_light = None
36  
37  print("ESP AT commands")
38  esp = adafruit_espatcontrol.ESP_ATcontrol(
39      uart, 115200, reset_pin=resetpin, rts_pin=rtspin, debug=False
40  )
41  wifi = adafruit_espatcontrol_wifimanager.ESPAT_WiFiManager(esp, secrets, status_light)
42  
43  
44  DATA_SOURCE = "https://api.thingspeak.com/channels/1417/feeds.json?results=1"
45  DATA_LOCATION = ["feeds", 0, "field2"]
46  
47  
48  # neopixels
49  pixels = neopixel.NeoPixel(board.A1, 16, brightness=0.3)
50  pixels.fill(0)
51  
52  # we'll save the value in question
53  last_value = value = None
54  
55  while True:
56      try:
57          print("Fetching json from", DATA_SOURCE)
58          response = wifi.get(DATA_SOURCE)
59          print(response.json())
60          value = response.json()
61          for key in DATA_LOCATION:
62              value = value[key]
63              print(value)
64          response.close()
65      except (ValueError, RuntimeError, adafruit_espatcontrol.OKError) as e:
66          print("Failed to get data, retrying\n", e)
67          wifi.reset()
68          continue
69  
70      if not value:
71          continue
72      if last_value != value:
73          color = int(value[1:], 16)
74          red = color >> 16 & 0xFF
75          green = color >> 8 & 0xFF
76          blue = color & 0xFF
77          gamma_corrected = fancy.gamma_adjust(fancy.CRGB(red, green, blue)).pack()
78  
79          pixels.fill(gamma_corrected)
80          last_value = value
81      response = None
82      time.sleep(60)