NodeMCU Projects: Difference between revisions
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== Projects == |
== Projects == |
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===Playing with GPIO=== |
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<syntaxhighlight lang="python"> |
<syntaxhighlight lang="python"> |
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===Fading an LED=== |
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<syntaxhighlight lang="python"> |
<syntaxhighlight lang="python"> |
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import time, math |
import time, math |
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=== Control a hobby servo === |
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Hobby servo motors can be controlled using PWM. |
Hobby servo motors can be controlled using PWM. |
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They require a frequency of 50Hz and a duty between about 40 and 115, with 77 being the center value. |
They require a frequency of 50Hz and a duty between about 40 and 115, with 77 being the center value. |
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*Manual Movements |
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<syntaxhighlight lang="python"> |
<syntaxhighlight lang="python"> |
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servo = machine.PWM(machine.Pin(12), freq=50) |
servo = machine.PWM(machine.Pin(12), freq=50) |
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</syntaxhighlight> |
</syntaxhighlight> |
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*Random movements: |
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<syntaxhighlight lang="python"> |
<syntaxhighlight lang="python"> |
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servo = machine.PWM(machine.Pin(12), freq=50) |
servo = machine.PWM(machine.Pin(12), freq=50) |
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servo.duty(urandom.getrandbits(8)) |
servo.duty(urandom.getrandbits(8)) |
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time.sleep(1) |
time.sleep(1) |
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</syntaxhighlight> |
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* Analog Temperature Meter: |
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Requirements: |
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DS18B20 Temperature sensor |
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Servo Motor |
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Micropython based NodeMCU |
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Wiring details: |
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Servo motor = D4 => GPIO 2 |
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DS18B20 = D7 => GPIO 13 |
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<syntaxhighlight lang="python"> |
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import time |
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import machine |
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import onewire, ds18x20 |
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# the device is on GPIO13 |
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dat = machine.Pin(13) |
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# create the onewire object |
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ds = ds18x20.DS18X20(onewire.OneWire(dat)) |
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# scan for devices on the bus |
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roms = ds.scan() |
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print('found devices:', roms) |
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# servo is connected to GPIO2 |
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servo = machine.PWM(machine.Pin(2), freq=50) |
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# Function for mapping range |
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def translate(value, leftMin, leftMax, rightMin, rightMax): |
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# Figure out how 'wide' each range is |
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leftSpan = leftMax - leftMin |
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rightSpan = rightMax - rightMin |
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# Convert the left range into a 0-1 range (float) |
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valueScaled = float(value - leftMin) / float(leftSpan) |
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# Convert the 0-1 range into a value in the right range. |
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return rightMin + (valueScaled * rightSpan) |
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# print all temperatures |
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while True: |
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ds.convert_temp() |
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time.sleep_ms(1000) |
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for rom in roms: |
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print(ds.read_temp(rom)) |
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temp = ds.read_temp(rom) |
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srv = translate(temp, 20, 35, 40, 115) |
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print(int(srv)) |
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if (temp>=20) & (temp<=35): |
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servo.duty(int(srv)) |
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else: |
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print("Out of Range") |
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</syntaxhighlight> |
</syntaxhighlight> |
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