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Author: TheKitty

Crickits/Make_It_Hot_Cold/Cold/code.py

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+# SPDX-FileCopyrightText: 2018 Anne Barela for Adafruit Industries
+#
+# SPDX-License-Identifier: MIT
+
+import time
+import board
+from analogio import AnalogIn
+from adafruit_crickit import crickit
+import neopixel
+
+print("Peltier Module Demo")
+
+pixels = neopixel.NeoPixel(board.NEOPIXEL, 10, auto_write=False)
+
+def show_value(time_val):         # Show time on NeoPixels on CPX
+    num_pixels = int(10-time_val)
+    for i in range(num_pixels):
+        pixels[i] = (10*(i+1), 0, 0)
+    for i in range(num_pixels, 10):
+        pixels[i] = (0, 0, 0)
+    pixels.show()
+
+TMP36 = AnalogIn(board.A3)  # TMP36 connected to A3, power & ground
+POT = AnalogIn(board.A7)    # potentiometer connected to A7, power & ground
+
+peltier = crickit.dc_motor_2  # Drive the Peltier from Motor 2 Output
+
+while True:                   # Loop forever
+
+    voltage = TMP36.value * 3.3 / 65536.0
+    tempC = (voltage - 0.5) * 100.0
+    tempF = (tempC * 9.0 / 5.0) + 32.0
+
+    cool_value = POT.value / 6553.6  # convert 0.0 to 10.0
+
+    # timing can be zero or can be 1 second to 10 seconds
+    # between 0 and 1 is too short a time for a Peltier module
+    if cool_value < 0.2:
+        cool_value = 0.0
+    if 1.0 > cool_value >= 0.2:
+        cool_value = 1.0
+
+    print((tempF, cool_value))  # Show in REPL
+    show_value(cool_value)      # Show on NeoPixels
+
+    # Peltier cannot be PWM - either off or on
+    # Use potentiometer read to set seconds b
+    if cool_value > 0:
+        peltier.throttle = 0.0     # turn off
+        time.sleep(cool_value)     # wait
+
+    peltier.throttle = 1.0         # turn on
+    time.sleep(10.0 - cool_value)  # wait

Crickits/Make_It_Hot_Cold/Hot/code.py

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+# SPDX-FileCopyrightText: 2018 Anne Barela for Adafruit Industries
+#
+# SPDX-License-Identifier: MIT
+
+import time
+import board
+from analogio import AnalogIn
+from adafruit_crickit import crickit
+import neopixel
+
+print("Heating Pad Demo")
+
+pixels = neopixel.NeoPixel(board.NEOPIXEL, 10, auto_write=False)
+
+def show_value(heat_val):         # Show throttle on NeoPixels on CPX
+    num_pixels = int(10 * (heat_val + 0.002))
+    for i in range(num_pixels):
+        pixels[i] = (10*(i+1), 0, 0)
+    for i in range(num_pixels, 10):
+        pixels[i] = (0, 0, 0)
+    pixels.show()
+
+TMP36 = AnalogIn(board.A3)  # TMP36 connected to A3, power & ground
+POT = AnalogIn(board.A7)    # potentiometer connected to A7, power & ground
+
+heating_pad = crickit.dc_motor_2  # Set the motor object to heating pad
+
+while True:   # Loop Forever
+
+    voltage = TMP36.value * 3.3 / 65536.0  # Read temp sensor, get voltage
+    tempC = (voltage - 0.5) * 100.0        # Calculate Celsius
+    tempF = (tempC * 9.0 / 5.0) + 32.0     # Calculate Fahrenheit
+
+    heat_value = POT.value / 65536.0   # Value (0.0 to 1.0) to drive pad
+
+    print((tempF, heat_value))         # Display temperature and drive
+    show_value(heat_value)
+
+    heating_pad.throttle = heat_value  # set Motor throttle value to heat_value
+
+    time.sleep(0.25)                   # Wait a bit before checking all again