NodeMCU Projects
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
import urandom
pin = machine.Pin(14, machine.Pin.OUT)
np = neopixel.NeoPixel(pin, 16)
def rand():
return urandom.getrandbits(8)
def cycle():
for i in range(16):
np[i] = (128,0,0)
np.write()
time.sleep_ms(25)
for i in range(16):
np[i] = (0,128,0)
np.write()
time.sleep_ms(25)
for i in range(16):
np[i] = (0,0,128)
np.write()
time.sleep_ms(25)
def circle():
for j in range(10):
x,y,z = rand(),rand(),rand()
for i in range(16):
np[i] = (x,y,z)
np.write()
time.sleep_ms(25)
def circle_rainbow():
for j in range(10):
for i in range(16):
np[i] = (rand(),rand(),rand())
np.write()
time.sleep_ms(25)
def fade():
for i in range(0, 4 * 256, 8):
for j in range(16):
if (i // 256) % 2 == 0:
val = i & 0xff
else:
val = 255 - (i & 0xff)
np[j] = (val, 0, 0)
np.write()
for i in range(0, 4 * 256, 8):
for j in range(16):
if (i // 256) % 2 == 0:
val = i & 0xff
else:
val = 255 - (i & 0xff)
np[j] = (0, val, 0)
np.write()
for i in range(0, 4 * 256, 8):
for j in range(16):
if (i // 256) % 2 == 0:
val = i & 0xff
else:
val = 255 - (i & 0xff)
np[j] = (0, 0, val)
np.write()
def bounce():
for i in range(5):
x,y,z = rand(),rand(),rand()
for i in range(4 * 16):
for j in range(16):
np[j] = (x,y,z)
if (i // 16) % 2 == 0:
np[i % 16] = (0, 0, 0)
else:
np[16 - 1 - (i % 16)] = (0, 0, 0)
np.write()
time.sleep_ms(60)
def off():
for i in range(16):
np[i] = (0,0,0)
np.write()
cycle()
off()
time.sleep(1)
circle()
off()
time.sleep(1)
circle_rainbow()
off()
time.sleep(1)
fade()
off()
time.sleep(1)
bounce()
off()
- References
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