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Testing CircuitPython on Teensy 4.0 – IoT made easy IoTeensy! @adafruit @CircuitPython @arturo182 @tannewt @NXP @PaulStoffregen

Testing CircuitPython on Teensy 4.0 – IoT made easy IoTeensy (video)! Scott and Artur have done an amazing job bringing CircuitPython to the NXP iMX RT1062, this chip holds a lot of promise! I threw together a quick IoT project to test I2C and SPI – the OLED is an I2C device, and the AirLift Featherwing provides WiFi over SPI. This demo connects to my AP, then queries the adafruit quote service to get an inspirational quote every 3 seconds. The JSON is parsed, split, and displayed on the OLED by scrolling. Was really fast to put together, only about 20 minutes and 100 lines of code.

Discussion on PJRC forums here and on the MicroPython forums, and loading it up here.

Code is here:

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import time
import board
import busio
from digitalio import DigitalInOut
import adafruit_esp32spi.adafruit_esp32spi_socket as socket
from adafruit_esp32spi import adafruit_esp32spi
import adafruit_requests as requests
import adafruit_ssd1306
print("ESP32 SPI webclient test")
JSON_URL = "https://www.adafruit.com/api/quotes.php"
i2c = busio.I2C(board.SCL, board.SDA, frequency=100000)
display = adafruit_ssd1306.SSD1306_I2C(128, 32, i2c, addr=0x3c)
# If you have an externally connected ESP32:
esp32_cs = DigitalInOut(board.D5)
esp32_reset = DigitalInOut(board.D6)
esp32_ready = DigitalInOut(board.D9)
spi = busio.SPI(board.SCK, board.MOSI, board.MISO)
esp = adafruit_esp32spi.ESP_SPIcontrol(spi, esp32_cs, esp32_ready, esp32_reset)
requests.set_socket(socket, esp)
if esp.status == adafruit_esp32spi.WL_IDLE_STATUS:
    print("ESP32 found and in idle mode")
print("Firmware vers.", esp.firmware_version)
print("MAC addr:", [hex(i) for i in esp.MAC_address])
display.fill(0)
display.text("Found ESP32", 0, 0, 1)
display.show()
for ap in esp.scan_networks():
    print("\t%s\t\tRSSI: %d" % (str(ap['ssid'], 'utf-8'), ap['rssi']))
print("Connecting to AP...")
display.text("Connecting to AP", 0, 8, 1)
display.show()
while not esp.is_connected:
    try:
        esp.connect_AP(b'adafruit', b'ffffffff')
    except RuntimeError as e:
        print("could not connect to AP, retrying: ",e)
        continue
print("Connected to", str(esp.ssid, 'utf-8'), "\tRSSI:", esp.rssi)
print("My IP address is", esp.pretty_ip(esp.ip_address))
print("IP lookup adafruit.com: %s" % esp.pretty_ip(esp.get_host_by_name("adafruit.com")))
print("Ping google.com: %d ms" % esp.ping("google.com"))
display.text("Connected: "+str(esp.ssid, 'utf-8'), 0, 16, 1)
display.text("IP: "+esp.pretty_ip(esp.ip_address), 0, 24, 1)
display.show()
def wrap_nicely(string, max_chars):
        """A helper that will return a list of lines with word-break wrapping.
        :param str string: The text to be wrapped.
        :param int max_chars: The maximum number of characters on a line before wrapping.
        """
        string = string.replace('\n', '').replace('\r', '') # strip confusing newlines
        words = string.split(' ')
        the_lines = []
        the_line = ""
        for w in words:
            if len(the_line+' '+w) <= max_chars:
                the_line += ' '+w
            else:
                the_lines.append(the_line)
                the_line = ''+w
        if the_line:      # last line remaining
            the_lines.append(the_line)
        # remove first space from first line:
        the_lines[0] = the_lines[0][1:]
        return the_lines
while True:
    print()
    print("Fetching json from", JSON_URL)
    r = requests.get(JSON_URL)
    j = r.json()
    print('-'*40)
    print(j)
    print('-'*40)
    quote = j[0]['text']
    author = j[0]['author']
    r.close()
    display.fill(0)
    lines = wrap_nicely(quote, 21)
    lines.append(" ")
    lines.append(author)
    print(lines)
    for i, line in enumerate(lines[:-2]):
        display.fill(0)
        display.text(line, 0, 0, 1)
        if len(lines) > i+1:
            display.text(lines[i+1], 0, 8, 1)
        if len(lines) > i+2:
            display.text(lines[i+2], 0, 16, 1)
        if len(lines) > i+3:
            display.text(lines[i+3], 0, 24, 1)
        display.show()
        time.sleep(0.5)
    time.sleep(3)
print("Done!")


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