Analog Temperature Meter

Requirements:

DS18B20 Temperature sensor
Servo Motor
Micropython based NodeMCU

Wiring details:

Servo motor = D4 => GPIO 2
DS18B20     = D7 => GPIO 13

import time
import machine
import onewire, ds18x20

# the device is on GPIO13
dat = machine.Pin(13)

# create the onewire object
ds = ds18x20.DS18X20(onewire.OneWire(dat))

# scan for devices on the bus
roms = ds.scan()
print('found devices:', roms)

# servo is connected to GPIO2
servo = machine.PWM(machine.Pin(2), freq=50)

# Function for mapping range
def translate(value, leftMin, leftMax, rightMin, rightMax):
    # Figure out how 'wide' each range is
    leftSpan = leftMax - leftMin
    rightSpan = rightMax - rightMin

    # Convert the left range into a 0-1 range (float)
    valueScaled = float(value - leftMin) / float(leftSpan)

    # Convert the 0-1 range into a value in the right range.
    return rightMin + (valueScaled * rightSpan)
 
# print all temperatures
while True:
    ds.convert_temp()
    time.sleep_ms(1000)
    for rom in roms:
        print(ds.read_temp(rom))
    temp = ds.read_temp(rom)
    srv = translate(temp, 20, 35, 115, 40)
    print(int(srv))
    if (temp>=20) & (temp<=35):
        servo.duty(int(srv))
    else:
        print("Out of Range")

NeoPixel

import machine
import neopixel
import time

pin = machine.Pin(14, machine.Pin.OUT)
np = neopixel.NeoPixel(pin, 16)

def cycle():
    while True:
        for i in range(16):
            np[i] = (255,0,0)
            np.write()
            time.sleep_ms(25)

        for i in range(16):
            np[i] = (0,255,0)
            np.write()
            time.sleep_ms(25)

        for i in range(16):
            np[i] = (0,0,255)
            np.write()
            time.sleep_ms(25)
        i += 10

def circle(x,y,z):
    for i in range(16):
        np[i] = (x,y,z)
        np.write()
        time.sleep_ms(25)

def demo(np):
    n = np.n

    # cycle
    for i in range(4 * n):
        for j in range(n):
            np[j] = (0, 0, 0)
        np[i % n] = (255, 255, 255)
        np.write()
        time.sleep_ms(25)

    # bounce
    for i in range(4 * n):
        for j in range(n):
            np[j] = (0, 0, 128)
        if (i // n) % 2 == 0:
            np[i % n] = (0, 0, 0)
        else:
            np[n - 1 - (i % n)] = (0, 0, 0)
        np.write()
        time.sleep_ms(60)

    # fade in/out
    for i in range(0, 4 * 256, 8):
        for j in range(n):
            if (i // 256) % 2 == 0:
                val = i & 0xff
            else:
                val = 255 - (i & 0xff)
            np[j] = (val, 0, 0)
        np.write()

    # clear
    for i in range(n):
        np[i] = (0, 0, 0)
    np.write()

# Under Construction
def rainbow():
    pass

def off():
    for i in range(16):
        np[i] = (0,0,0)
        np.write()

off()

References

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