slow down every example

Author: ladyada

examples/scd30_ft232htest.py

@@ -0,0 +1,27 @@
+# SPDX-FileCopyrightText: 2020 by Bryan Siepert, written for Adafruit Industries
+#
+# SPDX-License-Identifier: Unlicense
+import time
+import board
+import busio
+import adafruit_scd30
+
+# SCD-30 has tempremental I2C with clock stretching, and delays
+# It's best to start using I2C clock slower and then you can increase it
+# until the sensor stops responding (NAK fails, etc)
+i2c = busio.I2C(board.SCL, board.SDA, frequency=1000) # for FT232H, use 1KHz
+scd = adafruit_scd30.SCD30(i2c)
+
+while True:
+    # since the measurement interval is long (2+ seconds) we check for new data before reading
+    # the values, to ensure current readings.
+    if scd.data_available:
+        print("Data Available!")
+        print("CO2: %d PPM" % scd.CO2)
+        print("Temperature: %0.2f degrees C" % scd.temperature)
+        print("Humidity: %0.2f %% rH" % scd.relative_humidity)
+        print("")
+        print("Waiting for new data...")
+        print("")
+
+    time.sleep(0.5)

examples/scd30_mcp2221test.py

@@ -3,9 +3,12 @@
 # SPDX-License-Identifier: Unlicense
 import time
 import board
+import busio
 import adafruit_scd30
 
-i2c = board.I2C()  # uses board.SCL and board.SDA
+# SCD-30 has tempremental I2C with clock stretching, datasheet recommends
+# starting at 50KHz
+i2c = busio.I2C(board.SCL, board.SDA, frequency=50000)
 scd = adafruit_scd30.SCD30(i2c)
 
 # The SCD30 reset generates a hiccup on the SCL and SDA lines

examples/scd30_simpletest.py

@@ -6,11 +6,9 @@
 import busio
 import adafruit_scd30
 
-# SCD-30 has tempremental I2C with clock stretching, and delays
-# It's best to start using I2C clock slower and then you can increase it
-# until the sensor stops responding (NAK fails, etc)
-#i2c = busio.I2C(board.SCL, board.SDA, frequency=1000) # for FT232H, use 1KHz
-i2c = busio.I2C(board.SCL, board.SDA, frequency=50000) # for MCP2221 and others, use 50KHz
+# SCD-30 has tempremental I2C with clock stretching, datasheet recommends
+# starting at 50KHz
+i2c = busio.I2C(board.SCL, board.SDA, frequency=50000)
 scd = adafruit_scd30.SCD30(i2c)
 
 while True:

examples/scd30_tuning_knobs.py

@@ -3,9 +3,12 @@
 # SPDX-License-Identifier: Unlicense
 import time
 import board
+import busio
 import adafruit_scd30
 
-i2c = board.I2C()  # uses board.SCL and board.SDA
+# SCD-30 has tempremental I2C with clock stretching, datasheet recommends
+# starting at 50KHz
+i2c = busio.I2C(board.SCL, board.SDA, frequency=50000)
 scd = adafruit_scd30.SCD30(i2c)
 # scd.temperature_offset = 10
 print("Temperature offset:", scd.temperature_offset)