<span data-mce-type="bookmark" style="display: inline-block; width: 0px; overflow: hidden; line-height: 0;" class="mce_SELRES_start"></span>
In this video lesson we showed how to convert an angle on the HSV color wheel into an RGB value that can be applied to an RGB LED. In effect, we can find a color we like on the HSV color wheel, and turn the LED in our project that color. The video above shows the framework we are using, and then derives the equations, and then develops the code. For your convenience, the code for the conversion is shown below. To make this a library, we save it as h2RGB.py on our Raspberry Pi Pico W. You can save it either in the same folder your main programs are in, or in the lib folder. To use the library, then simply import the file (h2RGB) and call the method h2RGB.getRGB(degrees), where degrees is the point on the HSV color wheel you want to convert. All of this is explained in detail in the above video.

def getRGB(deg):
    m=1/60
    if deg>=0 and deg<60:
        R=1
        G=0
        B=m*deg
    if deg>=60 and deg<120:
        R=1-m*(deg-60)
        G=0
        B=1
    if deg>=120 and deg<180:
        R=0
        G=m*(deg-120)
        B=1
    if deg>=180 and deg<240:
        R=0
        G=1
        B=1-m*(deg-180)
    if deg>=240 and deg<300:
        R=m*(deg-240)
        G=1
        B=0
    if deg>=300 and deg<360:
        R=1
        G=1-m*(deg-300)
        B=0
    myColor=(R,G,B)
    return myColor

def getRGB(deg):

m=1/60

if deg>=0 and deg<60:

R=1

G=0

B=m*deg

if deg>=60 and deg<120:

R=1-m*(deg-60)

G=0

B=1

if deg>=120 and deg<180:

R=0

G=m*(deg-120)

B=1

if deg>=180 and deg<240:

R=0

G=1

B=1-m*(deg-180)

if deg>=240 and deg<300:

R=m*(deg-240)

G=1

B=0

if deg>=300 and deg<360:

R=1

G=1-m*(deg-300)

B=0

myColor=(R,G,B)

return myColor

MicroPython, Raspberry Pi Pico

Raspberry Pi Pico W Mobile Weather Station Project

August 29, 2023 admin

In this video lesson, we create a mobile sensorless weather station. This is a follow on from our earlier lesson, and with this class, we add a rechargeable LiPo Battery, and an OLED screen. For your convenience, we show the code below that was developed in this video.

import network
import time
import secrets
import urequests

from machine import Pin, I2C
from ssd1306 import SSD1306_I2C

i2c=I2C(1,sda=Pin(2),scl=Pin(3), freq=400000)
dsp=SSD1306_I2C(128,64,i2c)

wlan=network.WLAN(network.STA_IF)
wlan.active(True)
wlan.connect(secrets.SSID,secrets.PASSWORD)
while wlan.isconnected()==False:
    print('Connecting . . .')
print('Congratulations, You Have Connected')
#weather=urequests.get("https://api.openweathermap.org/data/2.5/weather?lat=0.478623&lon=33.164364&appid=0d631313b55e6e128285fd7882ba913f&units=imperial").json()
weather=urequests.get("https://api.openweathermap.org/data/2.5/weather?q=Jinja,Uganda&appid=0d631313b55e6e128285fd7882ba913f&units=imperial").json()
tm=time.localtime(weather['dt']+weather['timezone'])
print('Welcome to '+weather['name']+', '+weather['sys']['country'])
print('Local Time: '+str(tm[3])+':'+str(tm[4])+'  '+str(tm[1])+'/'+str(tm[2])+'/'+str(tm[0]))
sr=time.localtime(weather['sys']['sunrise']+weather['timezone'])
print('Sunrise at: '+str(sr[3])+':'+str(sr[4]))
ss=time.localtime(weather['sys']['sunset']+weather['timezone'])
print('Sunset at: '+str(ss[3]-12)+':'+str(ss[4])+' PM')
print('Current Temp: '+str(weather['main']['temp'])+' F')
print('Current Humidity: '+str(weather['main']['humidity'])+' %')
print('Current Barometric Pressure: '+str(weather['main']['pressure']*0.0009869233)+' ATM')
for i in range(len(weather['weather'])):
    print('Current Conditions: '+weather['weather'][i]['main']+', '+weather['weather'][i]['description'])
print('Wind: '+str(weather['wind']['speed'])+' MPH')
myTime=time.time()
while True:
    if time.time()-myTime>300:
       weather=urequests.get("https://api.openweathermap.org/data/2.5/weather?q=Jinja,Uganda&appid=0d631313b55e6e128285fd7882ba913f&units=imperial").json()
       tm=time.localtime(weather['dt']+weather['timezone'])
       ss=time.localtime(weather['sys']['sunset']+weather['timezone'])
       myTime=time.time()
       print('New Data Read')
    dsp.text('Welcome to '+weather['name'],0,0)
    sr=time.localtime(weather['sys']['sunrise']+weather['timezone'])

    dsp.text('Time: '+str(tm[3])+':'+str(tm[4]),0,16)
    dsp.text('Date: '+str(tm[1])+'/'+str(tm[2])+'/'+str(tm[0]),0,26)
    dsp.text('Sunrise: '+str(sr[3])+':'+str(sr[4]),0,36)
    dsp.text('Sunset: '+str(ss[3]-12)+':'+str(ss[4])+' PM',0,46)
    dsp.show()
    time.sleep(5)
    dsp.fill(0)
    dsp.text('Welcome to '+weather['name'],0,0)
    dsp.text('Weather: ',0,16)
    dsp.text('Temp: '+str(weather['main']['temp'])+' F',0,26)
    dsp.text('Humidity: '+str(weather['main']['humidity'])+' %',0,36)
    dsp.text('BP: '+str(weather['main']['pressure']*0.0009869233)+' ATM',0,46)
    dsp.text('Wind: '+str(weather['wind']['speed'])+' MPH',0,56)
    dsp.show()
    time.sleep(5)
    dsp.fill(0)
    dsp.text('Welcome to '+weather['name'],0,0)
    dsp.text('Conditions: ',0,16)
    row=26
    for i in range(len(weather['weather'])):
        dsp.text(weather['weather'][i]['main'],0,row)
        row=row+10
        dsp.text(weather['weather'][i]['description'],0,row)
        row=row+10
    dsp.show()
    time.sleep(5)
    dsp.fill(0)

import network

import time

import secrets

import urequests

from machine import Pin, I2C

from ssd1306 import SSD1306_I2C

i2c=I2C(1,sda=Pin(2),scl=Pin(3), freq=400000)

dsp=SSD1306_I2C(128,64,i2c)

wlan=network.WLAN(network.STA_IF)

wlan.active(True)

wlan.connect(secrets.SSID,secrets.PASSWORD)

while wlan.isconnected()==False:

print('Connecting . . .')

print('Congratulations, You Have Connected')

#weather=urequests.get("https://api.openweathermap.org/data/2.5/weather?lat=0.478623&lon=33.164364&appid=0d631313b55e6e128285fd7882ba913f&units=imperial").json()

weather=urequests.get("https://api.openweathermap.org/data/2.5/weather?q=Jinja,Uganda&appid=0d631313b55e6e128285fd7882ba913f&units=imperial").json()

tm=time.localtime(weather['dt']+weather['timezone'])

print('Welcome to '+weather['name']+', '+weather['sys']['country'])

print('Local Time: '+str(tm[3])+':'+str(tm[4])+' '+str(tm[1])+'/'+str(tm[2])+'/'+str(tm[0]))

sr=time.localtime(weather['sys']['sunrise']+weather['timezone'])

print('Sunrise at: '+str(sr[3])+':'+str(sr[4]))

ss=time.localtime(weather['sys']['sunset']+weather['timezone'])

print('Sunset at: '+str(ss[3]-12)+':'+str(ss[4])+' PM')

print('Current Temp: '+str(weather['main']['temp'])+' F')

print('Current Humidity: '+str(weather['main']['humidity'])+' %')

print('Current Barometric Pressure: '+str(weather['main']['pressure']*0.0009869233)+' ATM')

for i in range(len(weather['weather'])):

print('Current Conditions: '+weather['weather'][i]['main']+', '+weather['weather'][i]['description'])

print('Wind: '+str(weather['wind']['speed'])+' MPH')

myTime=time.time()

while True:

if time.time()-myTime>300:

weather=urequests.get("https://api.openweathermap.org/data/2.5/weather?q=Jinja,Uganda&appid=0d631313b55e6e128285fd7882ba913f&units=imperial").json()

tm=time.localtime(weather['dt']+weather['timezone'])

ss=time.localtime(weather['sys']['sunset']+weather['timezone'])

myTime=time.time()

print('New Data Read')

dsp.text('Welcome to '+weather['name'],0,0)

sr=time.localtime(weather['sys']['sunrise']+weather['timezone'])

dsp.text('Time: '+str(tm[3])+':'+str(tm[4]),0,16)

dsp.text('Date: '+str(tm[1])+'/'+str(tm[2])+'/'+str(tm[0]),0,26)

dsp.text('Sunrise: '+str(sr[3])+':'+str(sr[4]),0,36)

dsp.text('Sunset: '+str(ss[3]-12)+':'+str(ss[4])+' PM',0,46)

dsp.show()

time.sleep(5)

dsp.fill(0)

dsp.text('Welcome to '+weather['name'],0,0)

dsp.text('Weather: ',0,16)

dsp.text('Temp: '+str(weather['main']['temp'])+' F',0,26)

dsp.text('Humidity: '+str(weather['main']['humidity'])+' %',0,36)

dsp.text('BP: '+str(weather['main']['pressure']*0.0009869233)+' ATM',0,46)

dsp.text('Wind: '+str(weather['wind']['speed'])+' MPH',0,56)

dsp.show()

time.sleep(5)

dsp.fill(0)

dsp.text('Welcome to '+weather['name'],0,0)

dsp.text('Conditions: ',0,16)

row=26

for i in range(len(weather['weather'])):

dsp.text(weather['weather'][i]['main'],0,row)

row=row+10

dsp.text(weather['weather'][i]['description'],0,row)

row=row+10

dsp.show()

time.sleep(5)

dsp.fill(0)

MicroPython, Raspberry Pi Pico

Sensorless Remote Weather Station Project

August 22, 2023 admin

In this video lesson we show you step-by-step instructions on how to build a sensorless weather station on your Raspberry Pi Pico W. We show how to download real-time weather data from the internet, how to parse the data, and then display it. For your convenience, we include the code below which we develop in the video.

import network
import time
import secrets
import urequests
wlan=network.WLAN(network.STA_IF)
wlan.active(True)
wlan.connect(secrets.SSID,secrets.PASSWORD)
while wlan.isconnected()==False:
    print('Connecting . . .')
print('Congratulations, You Have Connected')
weather=urequests.get("https://api.openweathermap.org/data/2.5/weather?q=Jinja,Uganda&appid=0d631313b55e6e128285fd7882ba913f&units=imperial").json()
tm=time.localtime(weather['dt']+weather['timezone'])
print('Welcome to '+weather['name']+', '+weather['sys']['country'])
print('Local Time: '+str(tm[3])+':'+str(tm[4])+'  '+str(tm[1])+'/'+str(tm[2])+'/'+str(tm[0]))
sr=time.localtime(weather['sys']['sunrise']+weather['timezone'])
print('Sunrise at: '+str(sr[3])+':'+str(sr[4]))
ss=time.localtime(weather['sys']['sunset']+weather['timezone'])
print('Sunset at: '+str(ss[3]-12)+':'+str(ss[4])+' PM')
print('Current Temp: '+str(weather['main']['temp'])+' F')
print('Current Humidity: '+str(weather['main']['humidity'])+' %')
print('Current Barometric Pressure: '+str(weather['main']['pressure']*0.0009869233)+' ATM')
for i in range(len(weather['weather'])):
    print('Current Conditions: '+weather['weather'][i]['main']+', '+weather['weather'][i]['description'])
print('Wind: '+str(weather['wind']['speed'])+' MPH')

import network

import time

import secrets

import urequests

wlan=network.WLAN(network.STA_IF)

wlan.active(True)

wlan.connect(secrets.SSID,secrets.PASSWORD)

while wlan.isconnected()==False:

print('Connecting . . .')

print('Congratulations, You Have Connected')

weather=urequests.get("https://api.openweathermap.org/data/2.5/weather?q=Jinja,Uganda&appid=0d631313b55e6e128285fd7882ba913f&units=imperial").json()

tm=time.localtime(weather['dt']+weather['timezone'])

print('Welcome to '+weather['name']+', '+weather['sys']['country'])

print('Local Time: '+str(tm[3])+':'+str(tm[4])+' '+str(tm[1])+'/'+str(tm[2])+'/'+str(tm[0]))

sr=time.localtime(weather['sys']['sunrise']+weather['timezone'])

print('Sunrise at: '+str(sr[3])+':'+str(sr[4]))

ss=time.localtime(weather['sys']['sunset']+weather['timezone'])

print('Sunset at: '+str(ss[3]-12)+':'+str(ss[4])+' PM')

print('Current Temp: '+str(weather['main']['temp'])+' F')

print('Current Humidity: '+str(weather['main']['humidity'])+' %')

print('Current Barometric Pressure: '+str(weather['main']['pressure']*0.0009869233)+' ATM')

for i in range(len(weather['weather'])):

print('Current Conditions: '+weather['weather'][i]['main']+', '+weather['weather'][i]['description'])

print('Wind: '+str(weather['wind']['speed'])+' MPH')

MicroPython, Raspberry Pi Pico

Measure Temperature and Humidity on the Raspberry Pi Pico W

June 27, 2023 admin

In this video lesson we show how to create a simple project where the Raspberry Pi Pico W is connected to a DHT11 temperature and humidity sensor. The Pico measures the temperature and humidity from the sensor, and then displays it both on the Computer Screen, and on the LCD display we have connected to the Pico. The display toggles between showing degrees C and degrees F via a pushbutton. The schematic for the circuit is shown below:

Raspberry Pi Pico with DHT11 — Schematic showing how to connect LCD, pushbutton and DHT11 to the Raspberry Pi Pico W

Below is the software we developed for this project. Note you must first install the LCD library, which we show how to do HERE.

from machine import Pin
import utime as time
from dht import DHT11
from lcd1602 import LCD
lcd=LCD()

dataPin=16
myPin=Pin(dataPin,Pin.OUT,Pin.PULL_DOWN)
sensor=DHT11(myPin)

butPin=15
myButton=Pin(butPin,Pin.IN,Pin.PULL_UP)
tempUnitC=True
buttonState=1
buttonStateOld=1
print('My Sensor Data')
while True:
    buttonState=myButton.value()
    if buttonStateOld==0 and buttonState==1:
        tempUnitC= not tempUnitC
    try:
        sensor.measure()
    except:
        pass
    tempC=sensor.temperature()
    tempF=tempC*9/5+32
    hum=sensor.humidity()
    if tempUnitC==True:
        print("\r",'Temp= ',tempC,chr(176)+'C ', 'Humidity= ',hum,'%',end='    ')
        lcd.write(0,0,'Temp: '+str(tempC)+'\xDF'+'C  ')
        lcd.write(0,1,"Humidity: "+str(hum)+'%')
    if tempUnitC==False:
        print("\r",'Temp= ',tempF,chr(176)+'F ', 'Humidity= ',hum,'%',end='    ')
        lcd.write(0,0,'Temp: '+str(tempF)+'\xDF'+'F')
        lcd.write(0,1,"Humidity: "+str(hum)+'%')
    time.sleep(.1)
    buttonStateOld=buttonState

from machine import Pin

import utime as time

from dht import DHT11

from lcd1602 import LCD

lcd=LCD()

dataPin=16

myPin=Pin(dataPin,Pin.OUT,Pin.PULL_DOWN)

sensor=DHT11(myPin)

butPin=15

myButton=Pin(butPin,Pin.IN,Pin.PULL_UP)

tempUnitC=True

buttonState=1

buttonStateOld=1

print('My Sensor Data')

while True:

buttonState=myButton.value()

if buttonStateOld==0 and buttonState==1:

tempUnitC= not tempUnitC

try:

sensor.measure()

except:

pass

tempC=sensor.temperature()

tempF=tempC*9/5+32

hum=sensor.humidity()

if tempUnitC==True:

print("\r",'Temp= ',tempC,chr(176)+'C ', 'Humidity= ',hum,'%',end=' ')

lcd.write(0,0,'Temp: '+str(tempC)+'\xDF'+'C ')

lcd.write(0,1,"Humidity: "+str(hum)+'%')

if tempUnitC==False:

print("\r",'Temp= ',tempF,chr(176)+'F ', 'Humidity= ',hum,'%',end=' ')

lcd.write(0,0,'Temp: '+str(tempF)+'\xDF'+'F')

lcd.write(0,1,"Humidity: "+str(hum)+'%')

time.sleep(.1)

buttonStateOld=buttonState

Uncategorized

Using a MFRC522 RFID Module and Tag with the Raspberry Pi

June 19, 2023 admin

This lesson describes how to add RFID Tag capability to the Raspberry Pi. we will be using the MFRC522 RFID Module. The schematic below shows how to connect the device up to the Raspberry Pi through a standard breakout board.

Technology Tutorials

Convert HSV to RGB in Micropython

Raspberry Pi Pico W Mobile Weather Station Project

Sensorless Remote Weather Station Project

Measure Temperature and Humidity on the Raspberry Pi Pico W

Using a MFRC522 RFID Module and Tag with the Raspberry Pi

Making The World a Better Place One High Tech Project at a Time. Enjoy!