Data logger code

Data_Logging_with_Feather_and_CircuitPython/DataLogger.py

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+import time
+import adafruit_sdcard
+import adafruit_am2320
+import board
+import busio
+import analogio
+import digitalio
+import storage
+
+vbat_voltage = analogio.AnalogIn(board.D9)
+
+i2c = busio.I2C(board.SCL, board.SDA)
+am2320 = adafruit_am2320.AM2320(i2c)
+
+SD_CS = board.D10
+spi = busio.SPI(board.SCK, board.MOSI, board.MISO)
+cs = digitalio.DigitalInOut(SD_CS)
+sd_card = adafruit_sdcard.SDCard(spi, cs)
+vfs = storage.VfsFat(sd_card)
+storage.mount(vfs, "/sd_card")
+
+
+def get_voltage(pin):
+    return (pin.value * 3.3) / 65536 * 2
+
+
+print("Logging temperature and humidity to log file")
+
+initial_time = time.monotonic()
+
+while True:
+    try:
+        with open("/sd_card/log.txt", "a") as sdc:
+            temperature = am2320.temperature
+            humidity = am2320.relative_humidity
+            battery_voltage = get_voltage(vbat_voltage)
+            current_time = time.monotonic()
+            time_stamp = current_time - initial_time
+            print("Seconds since current data log started:", int(time_stamp))
+            print("Temperature:", temperature)
+            print("Humidity:", humidity)
+            print("VBat voltage: {:.2f}".format(battery_voltage))
+            print()
+            sdc.write("{}, {}, {}, {:.2f}\n".format(int(time_stamp), temperature,
+                                                        humidity, battery_voltage))
+        time.sleep(3)
+    except OSError:
+        pass
+    except RuntimeError:
+        pass