Add Feather ESP32-S2 examples.

.pylintrc

@@ -52,7 +52,7 @@ confidence=
 # no Warning level messages displayed, use"--disable=all --enable=classes
 # --disable=W"
 # disable=import-error,print-statement,parameter-unpacking,unpacking-in-except,old-raise-syntax,backtick,long-suffix,old-ne-operator,old-octal-literal,import-star-module-level,raw-checker-failed,bad-inline-option,locally-disabled,locally-enabled,file-ignored,suppressed-message,useless-suppression,deprecated-pragma,apply-builtin,basestring-builtin,buffer-builtin,cmp-builtin,coerce-builtin,execfile-builtin,file-builtin,long-builtin,raw_input-builtin,reduce-builtin,standarderror-builtin,unicode-builtin,xrange-builtin,coerce-method,delslice-method,getslice-method,setslice-method,no-absolute-import,old-division,dict-iter-method,dict-view-method,next-method-called,metaclass-assignment,indexing-exception,raising-string,reload-builtin,oct-method,hex-method,nonzero-method,cmp-method,input-builtin,round-builtin,intern-builtin,unichr-builtin,map-builtin-not-iterating,zip-builtin-not-iterating,range-builtin-not-iterating,filter-builtin-not-iterating,using-cmp-argument,eq-without-hash,div-method,idiv-method,rdiv-method,exception-message-attribute,invalid-str-codec,sys-max-int,bad-python3-import,deprecated-string-function,deprecated-str-translate-call
-disable=too-many-instance-attributes,len-as-condition,too-few-public-methods,anomalous-backslash-in-string,no-else-return,simplifiable-if-statement,too-many-arguments,duplicate-code,no-name-in-module,no-member,print-statement,parameter-unpacking,unpacking-in-except,old-raise-syntax,backtick,long-suffix,old-ne-operator,old-octal-literal,import-star-module-level,raw-checker-failed,bad-inline-option,locally-disabled,locally-enabled,file-ignored,suppressed-message,useless-suppression,deprecated-pragma,apply-builtin,basestring-builtin,buffer-builtin,cmp-builtin,coerce-builtin,execfile-builtin,file-builtin,long-builtin,raw_input-builtin,reduce-builtin,standarderror-builtin,unicode-builtin,xrange-builtin,coerce-method,delslice-method,getslice-method,setslice-method,no-absolute-import,old-division,dict-iter-method,dict-view-method,next-method-called,metaclass-assignment,indexing-exception,raising-string,reload-builtin,oct-method,hex-method,nonzero-method,cmp-method,input-builtin,round-builtin,intern-builtin,unichr-builtin,map-builtin-not-iterating,zip-builtin-not-iterating,range-builtin-not-iterating,filter-builtin-not-iterating,using-cmp-argument,eq-without-hash,div-method,idiv-method,rdiv-method,exception-message-attribute,invalid-str-codec,sys-max-int,bad-python3-import,deprecated-string-function,deprecated-str-translate-call,import-error,missing-docstring,invalid-name,bad-whitespace,consider-using-enumerate,unexpected-keyword-arg,consider-using-f-string
+disable=too-many-instance-attributes,len-as-condition,too-few-public-methods,anomalous-backslash-in-string,no-else-return,simplifiable-if-statement,too-many-arguments,duplicate-code,no-name-in-module,no-member,print-statement,parameter-unpacking,unpacking-in-except,old-raise-syntax,backtick,long-suffix,old-ne-operator,old-octal-literal,import-star-module-level,raw-checker-failed,bad-inline-option,locally-disabled,locally-enabled,file-ignored,suppressed-message,useless-suppression,deprecated-pragma,apply-builtin,basestring-builtin,buffer-builtin,cmp-builtin,coerce-builtin,execfile-builtin,file-builtin,long-builtin,raw_input-builtin,reduce-builtin,standarderror-builtin,unicode-builtin,xrange-builtin,coerce-method,delslice-method,getslice-method,setslice-method,no-absolute-import,old-division,dict-iter-method,dict-view-method,next-method-called,metaclass-assignment,indexing-exception,raising-string,reload-builtin,oct-method,hex-method,nonzero-method,cmp-method,input-builtin,round-builtin,intern-builtin,unichr-builtin,map-builtin-not-iterating,zip-builtin-not-iterating,range-builtin-not-iterating,filter-builtin-not-iterating,using-cmp-argument,eq-without-hash,div-method,idiv-method,rdiv-method,exception-message-attribute,invalid-str-codec,sys-max-int,bad-python3-import,deprecated-string-function,deprecated-str-translate-call,import-error,missing-docstring,invalid-name,bad-whitespace,consider-using-enumerate,unexpected-keyword-arg,consider-using-f-string,unspecified-encoding
 
 # Enable the message, report, category or checker with the given id(s). You can
 # either give multiple identifier separated by comma (,) or put this option

Adafruit_Feather_ESP32-S2/Analog_In/code.py

@@ -0,0 +1,19 @@
+# SPDX-FileCopyrightText: 2021 Kattni Rembor for Adafruit Industries
+# SPDX-License-Identifier: Unlicense
+"""
+CircuitPython analog voltage value example
+"""
+import time
+import board
+import analogio
+
+analog_pin = analogio.AnalogIn(board.A0)
+
+
+def get_voltage(pin):
+    return (pin.value * 2.6) / 51375
+
+
+while True:
+    print(get_voltage(analog_pin))
+    time.sleep(0.1)

Adafruit_Feather_ESP32-S2/BME280_LC709203_Adafruit_IO/code.py

@@ -0,0 +1,131 @@
+# SPDX-FileCopyrightText: 2021 Kattni Rembor for Adafruit Industries
+# SPDX-License-Identifier: Unlicense
+"""
+CircuitPython Adafruit IO Example for BME280 and LC709203 Sensors
+"""
+import time
+import ssl
+import alarm
+import board
+import digitalio
+import wifi
+import socketpool
+import adafruit_requests
+from adafruit_io.adafruit_io import IO_HTTP, AdafruitIO_RequestError
+from adafruit_lc709203f import LC709203F, PackSize
+from adafruit_bme280 import basic as adafruit_bme280
+try:
+    from secrets import secrets
+except ImportError:
+    print("WiFi and Adafruit IO credentials are kept in secrets.py, please add them there!")
+    raise
+
+# Duration of sleep in seconds. Default is 600 seconds (10 minutes).
+# Feather will sleep for this duration between sensor readings / sending data to AdafruitIO
+sleep_duration = 600
+
+# Update to match the mAh of your battery for more accurate readings.
+# Can be MAH100, MAH200, MAH400, MAH500, MAH1000, MAH2000, MAH3000.
+# Choose the closest match. Include "PackSize." before it, as shown.
+battery_pack_size = PackSize.MAH400
+
+# Setup the little red LED
+led = digitalio.DigitalInOut(board.LED)
+led.switch_to_output()
+
+# Pull the I2C power pin low
+i2c_power = digitalio.DigitalInOut(board.I2C_POWER_INVERTED)
+i2c_power.switch_to_output()
+i2c_power.value = False
+
+# Set up the BME280 and LC709203 sensors
+bme280 = adafruit_bme280.Adafruit_BME280_I2C(board.I2C())
+battery_monitor = LC709203F(board.I2C())
+battery_monitor.pack_size = battery_pack_size
+
+# Collect the sensor data values and format the data
+temperature = "{:.2f}".format(bme280.temperature)
+temperature_f = "{:.2f}".format((bme280.temperature * (9 / 5) + 32))  # Convert C to F
+humidity = "{:.2f}".format(bme280.relative_humidity)
+pressure = "{:.2f}".format(bme280.pressure)
+battery_voltage = "{:.2f}".format(battery_monitor.cell_voltage)
+battery_percent = "{:.1f}".format(battery_monitor.cell_percent)
+
+
+def go_to_sleep(sleep_period):
+    # Create a an alarm that will trigger sleep_period number of seconds from now.
+    time_alarm = alarm.time.TimeAlarm(monotonic_time=time.monotonic() + sleep_period)
+    # Exit and deep sleep until the alarm wakes us.
+    alarm.exit_and_deep_sleep_until_alarms(time_alarm)
+
+
+# Fetch the feed of the provided name. If the feed does not exist, create it.
+def setup_feed(feed_name):
+    try:
+        # Get the feed of provided feed_name from Adafruit IO
+        return io.get_feed(feed_name)
+    except AdafruitIO_RequestError:
+        # If no feed of that name exists, create it
+        return io.create_new_feed(feed_name)
+
+
+# Send the data. Requires a feed name and a value to send.
+def send_io_data(feed, value):
+    return io.send_data(feed["key"], value)
+
+
+# Wi-Fi connections can have issues! This ensures the code will continue to run.
+try:
+    # Connect to Wi-Fi
+    wifi.radio.connect(secrets["ssid"], secrets["password"])
+    print("Connected to {}!".format(secrets["ssid"]))
+    print("IP:", wifi.radio.ipv4_address)
+
+    pool = socketpool.SocketPool(wifi.radio)
+    requests = adafruit_requests.Session(pool, ssl.create_default_context())
+
+# Wi-Fi connectivity fails with error messages, not specific errors, so this except is broad.
+except Exception as e:  # pylint: disable=broad-except
+    print(e)
+    go_to_sleep(60)
+
+# Set your Adafruit IO Username and Key in secrets.py
+# (visit io.adafruit.com if you need to create an account,
+# or if you need your Adafruit IO key.)
+aio_username = secrets["aio_username"]
+aio_key = secrets["aio_key"]
+
+# Initialize an Adafruit IO HTTP API object
+io = IO_HTTP(aio_username, aio_key, requests)
+
+# Turn on the LED to indicate data is being sent.
+led.value = True
+# Print data values to the serial console. Not necessary for Adafruit IO.
+print("Current BME280 temperature: {0} C".format(temperature))
+print("Current BME280 temperature: {0} F".format(temperature_f))
+print("Current BME280 humidity: {0} %".format(humidity))
+print("Current BME280 pressure: {0} hPa".format(pressure))
+print("Current battery voltage: {0} V".format(battery_voltage))
+print("Current battery percent: {0} %".format(battery_percent))
+
+# Adafruit IO sending can run into issues if the network fails!
+# This ensures the code will continue to run.
+try:
+    print("Sending data to AdafruitIO...")
+    # Send data to Adafruit IO
+    send_io_data(setup_feed("bme280-temperature"), temperature)
+    send_io_data(setup_feed("bme280-temperature-f"), temperature_f)
+    send_io_data(setup_feed("bme280-humidity"), humidity)
+    send_io_data(setup_feed("bme280-pressure"), pressure)
+    send_io_data(setup_feed("battery-voltage"), battery_voltage)
+    send_io_data(setup_feed("battery-percent"), battery_percent)
+    print("Data sent!")
+    # Turn off the LED to indicate data sending is complete.
+    led.value = False
+
+# Adafruit IO can fail with multiple errors depending on the situation, so this except is broad.
+except Exception as e:  # pylint: disable=broad-except
+    print(e)
+    go_to_sleep(60)
+
+go_to_sleep(sleep_duration)

Adafruit_Feather_ESP32-S2/BME280_LC709203_Simple_Data/code.py

@@ -0,0 +1,33 @@
+# SPDX-FileCopyrightText: 2021 Kattni Rembor for Adafruit Industries
+# SPDX-License-Identifier: Unlicense
+"""
+CircuitPython Simple Example for BME280 and LC709203 Sensors
+"""
+import time
+import board
+import digitalio
+from adafruit_bme280 import basic as adafruit_bme280
+from adafruit_lc709203f import LC709203F, PackSize
+
+# Pull the I2C power pin low
+i2c_power = digitalio.DigitalInOut(board.I2C_POWER_INVERTED)
+i2c_power.switch_to_output()
+i2c_power.value = False
+
+# Create sensor objects, using the board's default I2C bus.
+i2c = board.I2C()
+bme280 = adafruit_bme280.Adafruit_BME280_I2C(i2c)
+battery_monitor = LC709203F(board.I2C())
+battery_monitor.pack_size = PackSize.MAH400
+
+# change this to match your location's pressure (hPa) at sea level
+bme280.sea_level_pressure = 1013.25
+
+while True:
+    print("\nTemperature: {:.1f} C".format(bme280.temperature))
+    print("Humidity: {:.1f} %".format(bme280.relative_humidity))
+    print("Pressure: {:.1f} hPa".format(bme280.pressure))
+    print("Altitude: {:.2f} meters".format(bme280.altitude))
+    print("Battery Percent: {:.2f} %".format(battery_monitor.cell_percent))
+    print("Battery Voltage: {:.2f} V".format(battery_monitor.cell_voltage))
+    time.sleep(2)

Adafruit_Feather_ESP32-S2/Capacitive_Touch_One_Pin/code.py

@@ -0,0 +1,15 @@
+# SPDX-FileCopyrightText: 2021 Kattni Rembor for Adafruit Industries
+# SPDX-License-Identifier: Unlicense
+"""
+CircuitPython Capacitive Touch Pin Example - Print to the serial console when one pin is touched.
+"""
+import time
+import board
+import touchio
+
+touch = touchio.TouchIn(board.A4)
+
+while True:
+    if touch.value:
+        print("Pin touched!")
+    time.sleep(0.1)

Adafruit_Feather_ESP32-S2/Capacitive_Touch_Two_Pins/code.py

@@ -0,0 +1,18 @@
+# SPDX-FileCopyrightText: 2021 Kattni Rembor for Adafruit Industries
+# SPDX-License-Identifier: Unlicense
+"""
+CircuitPython Capacitive Two Touch Pin Example - Print to the serial console when a pin is touched.
+"""
+import time
+import board
+import touchio
+
+touch_one = touchio.TouchIn(board.A4)
+touch_two = touchio.TouchIn(board.A5)
+
+while True:
+    if touch_one.value:
+        print("Pin one touched!")
+    if touch_two.value:
+        print("Pin two touched!")
+    time.sleep(0.1)

Adafruit_Feather_ESP32-S2/Digital_Input/code.py

@@ -0,0 +1,17 @@
+"""
+CircuitPython Digital Input Example - Blinking an LED using a button switch.
+"""
+import board
+import digitalio
+
+led = digitalio.DigitalInOut(board.LED)
+led.direction = digitalio.Direction.OUTPUT
+
+button = digitalio.DigitalInOut(board.D5)
+button.switch_to_input(pull=digitalio.Pull.UP)
+
+while True:
+    if not button.value:
+        led.value = True
+    else:
+        led.value = False

Adafruit_Feather_ESP32-S2/Storage/boot.py

@@ -0,0 +1,14 @@
+# SPDX-FileCopyrightText: 2021 Kattni Rembor for Adafruit Industries
+# SPDX-License-Identifier: Unlicense
+"""
+CircuitPython Essentials Storage CP Filesystem boot.py file
+"""
+import board
+import digitalio
+import storage
+
+pin = digitalio.DigitalInOut(board.A0)
+pin.switch_to_input(pull=digitalio.Pull.UP)
+
+# If the pin is connected to ground, the filesystem is writable by CircuitPython
+storage.remount("/", readonly=pin.value)

Adafruit_Feather_ESP32-S2/Storage/code.py

@@ -0,0 +1,37 @@
+# SPDX-FileCopyrightText: 2021 Kattni Rembor for Adafruit Industries
+# SPDX-License-Identifier: Unlicense
+"""
+CircuitPython Essentials Storage CP Filesystem code.py file
+"""
+import time
+import board
+import digitalio
+import microcontroller
+
+led = digitalio.DigitalInOut(board.LED)
+led.switch_to_output()
+
+try:
+    with open("/temperature.txt", "a") as temp_log:
+        while True:
+            # The microcontroller temperature in Celsius. Include the
+            # math to do the C to F conversion here, if desired.
+            temperature = microcontroller.cpu.temperature
+
+            # Write the temperature to the temperature.txt file every 10 seconds.
+            temp_log.write('{0:.2f}\n'.format(temperature))
+            temp_log.flush()
+
+            # Blink the LED on every write...
+            led.value = True
+            time.sleep(1)  # ...for one second.
+            led.value = False  # Then turn it off...
+            time.sleep(9)  # ...for the other 9 seconds.
+
+except OSError as e:  # When the filesystem is NOT writable by CircuitPython...
+    delay = 0.5  # ...blink the LED every half second.
+    if e.args[0] == 28:  # If the file system is full...
+        delay = 0.15  # ...blink the LED every 0.15 seconds!
+    while True:
+        led.value = not led.value
+        time.sleep(delay)

CircuitPython_Templates/Analog_Pin_Values_Nonstandard_AREF/code.py

@@ -0,0 +1,29 @@
+# SPDX-FileCopyrightText: 2021 Kattni Rembor for Adafruit Industries
+# SPDX-License-Identifier: Unlicense
+"""
+CircuitPython analog voltage value example
+
+REMOVE THIS TEXT AND ALL THE FOLLOWING, AND THE PYLINT DISABLE COMMENT, BEFORE SUBMITTING TO LEARN:
+Update VOLTAGE to the max voltage returned by the board you're using.
+Update VALUE to the max analog pin value returned by the board you're using.
+
+For example:
+If you are using Feather ESP32-S2, update VOLTAGE to 2.6 and VALUE to 51375.
+
+Remove the #pylint: disable=undefined-variable before submitting to Learn. It is unnecessary
+once the VOLTAGE and VALUE are updated to valid numbers.
+"""
+import time
+import board
+import analogio
+
+analog_pin = analogio.AnalogIn(board.A0)
+
+
+def get_voltage(pin):
+    return (pin.value * VOLTAGE) / VALUE  # pylint: disable=undefined-variable
+
+
+while True:
+    print(get_voltage(analog_pin))
+    time.sleep(0.1)