Category Archives: Raspberry Pi Pico

In this video I show how to use both cores on the Raspberry Pi Pico W. We will explore an example using threading where we will operate 2 LED and a servo.

from machine import Pin
import time
import _thread
import SERVO

greenPin=14
redPin=15
servoPin=17

LED=""

redLED=Pin(redPin,Pin.OUT)
greenLED=Pin(greenPin,Pin.OUT)

delOn=.1
delOff=.1
myServo=SERVO.servo(servoPin)
running =True

def othCore(del1,del2):
    global LED
    while True:
        if LED=="RED":
            redLED.value(1)
            time.sleep(del1)
            redLED.value(0)
            time.sleep(del2)
        if LED=="GREEN":
            greenLED.value(1)
            time.sleep(del1)
            greenLED.value(0)
            time.sleep(del2)
_thread.start_new_thread(othCore,(delOn,delOff))
time.sleep(.25)
while True:
    LED="RED"
    for i in range(0,180,1):
        myServo.pos(i)
        time.sleep(.01)
    LED="GREEN"
    for i in range(180,0,-1):
        myServo.pos(i)
        time.sleep(.01)

from machine import Pin

import time

import _thread

import SERVO

greenPin=14

redPin=15

servoPin=17

LED=""

redLED=Pin(redPin,Pin.OUT)

greenLED=Pin(greenPin,Pin.OUT)

delOn=.1

delOff=.1

myServo=SERVO.servo(servoPin)

running =True

def othCore(del1,del2):

global LED

while True:

if LED=="RED":

redLED.value(1)

time.sleep(del1)

redLED.value(0)

time.sleep(del2)

if LED=="GREEN":

greenLED.value(1)

time.sleep(del1)

greenLED.value(0)

time.sleep(del2)

_thread.start_new_thread(othCore,(delOn,delOff))

time.sleep(.25)

while True:

LED="RED"

for i in range(0,180,1):

myServo.pos(i)

time.sleep(.01)

LED="GREEN"

for i in range(180,0,-1):

myServo.pos(i)

time.sleep(.01)

MicroPython, Raspberry Pi Pico

Servo Library for the Raspberry Pi Pico W in MicroPython

April 23, 2024 admin

In this lesson we demonstrate how to create a custom library on the Raspberry Pi Pico W to control a servo. We create a servo class, and then show how to use it as a library in future programs.

class servo:
    def __init__(self,sPin):
        import machine
        self.servoPin=sPin
        self.obj=machine.PWM(machine.Pin(self.servoPin))
        self.obj.freq(50)
    
    def pos(self,angle):
        writeVal=6553/180*angle+1638
        self.obj.duty_u16(int(writeVal))

class servo:

def __init__(self,sPin):

import machine

self.servoPin=sPin

self.obj=machine.PWM(machine.Pin(self.servoPin))

self.obj.freq(50)

def pos(self,angle):

writeVal=6553/180*angle+1638

self.obj.duty_u16(int(writeVal))

MicroPython, Raspberry Pi Pico

How to Write Modular Code With Micropython Functions

March 19, 2024 admin

In this lesson we show how to write modular code in micropython. We demonstrate this with a simple example of how to calculate parameters of interest for a given rectangle. For your convenience, the code developed in the video is presented below. Enjoy!

def rectSolve(len,wid):
    #global area,perimeter,diagonal
    area=rectArea(len,wid)
    perimeter=rectPerimeter(len,wid)
    diagonal=rectDiagonal(len,wid)
    return area,perimeter,diagonal

def rectArea(len,wid):
    area=len*wid
    return area

def rectPerimeter(len,wid):
    perimeter=2*len+2*wid
    return perimeter

def rectDiagonal(len,wid):
    diag=(len**2+wid**2)**(1/2)
    return diag
   
while True:
    l=float(input("What is Length of your Rectangle? "))
    w=float(input("what is the Width of your Rectuangle? "))
    a,p,d = rectSolve(l,w)
    print("Your Rectangle Information: ")
    print("Area: ",a)
    print("Perimeter: ",p)
    print("Diagonal: ",d)
    print()

def rectSolve(len,wid):

#global area,perimeter,diagonal

area=rectArea(len,wid)

perimeter=rectPerimeter(len,wid)

diagonal=rectDiagonal(len,wid)

return area,perimeter,diagonal

def rectArea(len,wid):

area=len*wid

return area

def rectPerimeter(len,wid):

perimeter=2*len+2*wid

return perimeter

def rectDiagonal(len,wid):

diag=(len**2+wid**2)**(1/2)

return diag

while True:

l=float(input("What is Length of your Rectangle? "))

w=float(input("what is the Width of your Rectuangle? "))

a,p,d = rectSolve(l,w)

print("Your Rectangle Information: ")

print("Area: ",a)

print("Perimeter: ",p)

print("Diagonal: ",d)

print()

MicroPython, Raspberry Pi Pico

Calibrating Joystick to Show Positional Angle in MicroPython on the Raspberry Pi Pico W

March 5, 2024 admin

In this Video Lesson we show how to calibrate a joystick to report Angular Position. We do this using MicroPython on a Raspberry Pi Pico W. For your convenience, the code is included below.

import machine
import time
import math
hPin=27
vPin=26
hJoy= machine.ADC(hPin)
vJoy= machine.ADC(vPin)
while True:
    hVal=hJoy.read_u16()
    vVal=vJoy.read_u16()
    
    hCal=int(-.00306*hVal+100.766)
    vCal=int(.00306*vVal-100.766)
    
    deg=math.atan2(vCal,hCal)*360/2/math.pi
    if hCal==0:
        hCal=1
    if deg<0:
        deg=deg+360
    
    mag=math.sqrt(hCal**2+vCal**2)
    if mag<=4:
        hCal=0
        vCal=0
    
    print(hCal,vCal,deg)
    time.sleep_ms(200)

import machine

import time

import math

hPin=27

vPin=26

hJoy= machine.ADC(hPin)

vJoy= machine.ADC(vPin)

while True:

hVal=hJoy.read_u16()

vVal=vJoy.read_u16()

hCal=int(-.00306*hVal+100.766)

vCal=int(.00306*vVal-100.766)

deg=math.atan2(vCal,hCal)*360/2/math.pi

if hCal==0:

hCal=1

if deg<0:

deg=deg+360

mag=math.sqrt(hCal**2+vCal**2)

if mag<=4:

hCal=0

vCal=0

print(hCal,vCal,deg)

time.sleep_ms(200)

MicroPython, Raspberry Pi Pico

Remove Long Term Steady State Errors from MPU6050 Tilt Measurements

January 2, 2024 admin

In this video lesson I show you how to remove long term steady state error from the tilt values calculated from the MPU6050 IMU. We are using the following schematic for our prototype.

For your convenience, this is the code we developed in the video.

from imu import MPU6050
from machine import I2C,Pin
import math
import time
 
i2c=I2C(0, sda=Pin(16), scl=Pin(17), freq=400000)
mpu = MPU6050(i2c)
 
rollG=0
pitchG=0

rollComp=0
pitchComp=0

errorR=0
errorP=0

yaw=0
tLoop=0
cnt=0
 
while True:
    tStart=time.ticks_ms()
    
    xGyro=mpu.gyro.x
    yGyro=-mpu.gyro.y
    zGyro=mpu.gyro.z
    
    xAccel=mpu.accel.x
    yAccel=mpu.accel.y
    zAccel=mpu.accel.z
    
    rollG=rollG+yGyro*tLoop
    pitchG=pitchG+xGyro*tLoop
    
    rollA=math.atan(xAccel/zAccel)/2/math.pi*360
    pitchA=math.atan(yAccel/zAccel)/2/math.pi*360
    
    rollComp= rollA*.005 + .995*(rollComp+yGyro*tLoop)+errorR*.005
    pitchComp= pitchA*.005 + .995*(pitchComp+xGyro*tLoop)+errorP*.005
    
    errorP=errorP + (pitchA-pitchComp)*tLoop
    errorR=errorR + (rollA-rollComp)*tLoop
    
    cnt=cnt+1
    if cnt==10:
        cnt=0
        print('RA: ',rollA,'PA: ',pitchA,'RC: ',rollComp,'PC: ',pitchComp)
        #print('RA: ',rollA,'RC: ',rollComp)
    tStop=time.ticks_ms()
    tLoop=(tStop-tStart)*.001

from imu import MPU6050

from machine import I2C,Pin

import math

import time

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

mpu = MPU6050(i2c)

rollG=0

pitchG=0

rollComp=0

pitchComp=0

errorR=0

errorP=0

yaw=0

tLoop=0

cnt=0

while True:

tStart=time.ticks_ms()

xGyro=mpu.gyro.x

yGyro=-mpu.gyro.y

zGyro=mpu.gyro.z

xAccel=mpu.accel.x

yAccel=mpu.accel.y

zAccel=mpu.accel.z

rollG=rollG+yGyro*tLoop

pitchG=pitchG+xGyro*tLoop

rollA=math.atan(xAccel/zAccel)/2/math.pi*360

pitchA=math.atan(yAccel/zAccel)/2/math.pi*360

rollComp= rollA*.005 + .995*(rollComp+yGyro*tLoop)+errorR*.005

pitchComp= pitchA*.005 + .995*(pitchComp+xGyro*tLoop)+errorP*.005

errorP=errorP + (pitchA-pitchComp)*tLoop

errorR=errorR + (rollA-rollComp)*tLoop

cnt=cnt+1

if cnt==10:

cnt=0

print('RA: ',rollA,'PA: ',pitchA,'RC: ',rollComp,'PC: ',pitchComp)

#print('RA: ',rollA,'RC: ',rollComp)

tStop=time.ticks_ms()

tLoop=(tStop-tStart)*.001

Technology Tutorials

Category Archives: Raspberry Pi Pico

MicroPython MultiCore Programming on the Raspberry Pi Pico Using Threading

Servo Library for the Raspberry Pi Pico W in MicroPython

How to Write Modular Code With Micropython Functions

Calibrating Joystick to Show Positional Angle in MicroPython on the Raspberry Pi Pico W

Remove Long Term Steady State Errors from MPU6050 Tilt Measurements

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