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('

', '').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!")

"""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. """

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.



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Stop breadboarding and soldering – start making immediately! Adafruit’s Circuit Playground is jam-packed with LEDs, sensors, buttons, alligator clip pads and more. Build projects with Circuit Playground in a few minutes with the drag-and-drop MakeCode programming site, learn computer science using the CS Discoveries class on code.org, jump into CircuitPython to learn Python and hardware together, TinyGO, or even use the Arduino IDE. Circuit Playground Express is the newest and best Circuit Playground board, with support for CircuitPython, MakeCode, and Arduino. It has a powerful processor, 10 NeoPixels, mini speaker, InfraRed receive and transmit, two buttons, a switch, 14 alligator clip pads, and lots of sensors: capacitive touch, IR proximity, temperature, light, motion and sound. A whole wide world of electronics and coding is waiting for you, and it fits in the palm of your hand.

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CircuitPython – The easiest way to program microcontrollers – CircuitPython.org