OLED | Technology Tutorials

In this video lesson, we demonstrate how to create a two-axis tilt meter. The device displays both the pitch and roll on an OLED. In addition to this quantitative display of tilt and roll, it also shows a carpenter’s level type visual, where a circle, or bubble moves to indicate tilt. When the circle is centered on the crosshairs, the device is flat in both axis.

For your convenience, this is the schematic we are using:

MPU 6050 — Schematic for Creating a Tilt Meter

And we also include the code we developed in this lesson.

from imu import MPU6050
from machine import I2C,Pin
import math
import time
from ssd1306 import SSD1306_I2C

def circle(radius,xOff,yOff):
    xCenter=64
    yCenter=45
    for deg in range(0,360):
        rads=deg/360*2*math.pi
        x=radius*math.cos(rads)
        y=radius*math.sin(rads)
        dsp.pixel(int(x+xCenter-xOff),int(y+yCenter-yOff),1)

i2c=I2C(0, sda=Pin(16), scl=Pin(17), freq=400000)
mpu = MPU6050(i2c)

i2c2=I2C(1,sda=Pin(2), scl=Pin(3), freq=400000)
dsp=SSD1306_I2C(128,64,i2c2)
dsp.fill(0)

while True:
    xAccel=mpu.accel.x
    yAccel=mpu.accel.y
    zAccel=mpu.accel.z
    
    pitch=math.atan(yAccel/zAccel)
    roll=math.atan(xAccel/zAccel)
    pitchDeg=pitch/(2*math.pi)*360
    rollDeg=roll/(2*math.pi)*360
    #print('pitch: ',pitchDeg, 'roll: ',rollDeg)
    dsp.text('Tiltomatic',0,0)
    msg='P: '+str(round(pitchDeg,1))+' R: '+str(round(rollDeg,1))
    dsp.text(msg,0,16)
    dsp.rect(0,26,128,38,1)
    dsp.hline(0,45,128,1)
    dsp.vline(64,26,38,1)
    print(pitchDeg,rollDeg)
    circle(7,int(2.5*pitchDeg),int(rollDeg))
    dsp.show()
    dsp.fill(0)
    time.sleep(.1)

from imu import MPU6050

from machine import I2C,Pin

import math

import time

from ssd1306 import SSD1306_I2C

def circle(radius,xOff,yOff):

xCenter=64

yCenter=45

for deg in range(0,360):

rads=deg/360*2*math.pi

x=radius*math.cos(rads)

y=radius*math.sin(rads)

dsp.pixel(int(x+xCenter-xOff),int(y+yCenter-yOff),1)

i2c=I2C(0, sda=Pin(16), scl=Pin(17), freq=400000)

mpu = MPU6050(i2c)

i2c2=I2C(1,sda=Pin(2), scl=Pin(3), freq=400000)

dsp=SSD1306_I2C(128,64,i2c2)

dsp.fill(0)

while True:

xAccel=mpu.accel.x

yAccel=mpu.accel.y

zAccel=mpu.accel.z

pitch=math.atan(yAccel/zAccel)

roll=math.atan(xAccel/zAccel)

pitchDeg=pitch/(2*math.pi)*360

rollDeg=roll/(2*math.pi)*360

#print('pitch: ',pitchDeg, 'roll: ',rollDeg)

dsp.text('Tiltomatic',0,0)

msg='P: '+str(round(pitchDeg,1))+' R: '+str(round(rollDeg,1))

dsp.text(msg,0,16)

dsp.rect(0,26,128,38,1)

dsp.hline(0,45,128,1)

dsp.vline(64,26,38,1)

print(pitchDeg,rollDeg)

circle(7,int(2.5*pitchDeg),int(rollDeg))

dsp.show()

dsp.fill(0)

time.sleep(.1)

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)

Technology Tutorials

Tag Archives: OLED

Two Axis Tilt Meter Displaying Pitch and Roll Using an MPU6050 on the Raspberry Pi Pico W

Raspberry Pi Pico W Mobile Weather Station Project

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