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‎src/kits/pwm-display/01-pot-print.py

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from machine import Pin, ADC
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from utime import sleep
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POT_PIN = ADC(26)
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while True:
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print(POT_PIN.read_u16())
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sleep(.1)

‎src/kits/pwm-display/03-display-pot-bar.py

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# Display a PWM waveform on a 128x64 OLED Display
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from machine import Pin, ADC, SPI
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from utime import sleep
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import ssd1306
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# this is the built-in LED on the Pico
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led = Pin('LED', Pin.OUT)
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WIDTH = 128
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HEIGHT = 64
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HALF_HEIGHT = HEIGHT // 2
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clock=Pin(2)
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data=Pin(3)
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RES = Pin(4)
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DC = Pin(5)
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CS = Pin(6)
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spi=SPI(0, sck=clock, mosi=data)
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oled = ssd1306.SSD1306_SPI(WIDTH, HEIGHT, spi, DC, RES, CS)
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POT_PIN = ADC(26)
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POT_MAX = 65536
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# map a value from one rante into another range
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# checks for divide by zero
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def map(value, istart, istop, ostart, ostop):
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# check ff (istop - istart)
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if (istop - istart) == 0:
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return ostop
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else:
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return int(ostart + (ostop - ostart) * ((value - istart) / (istop - istart)))
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# draw a horizontal bar
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def draw_hbar(inval, yPos, barHeight):
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oled.fill_rect(0, yPos, inval, barHeight, 1) # fill with 1s
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def update_display(xPos):
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oled.fill(0)
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oled.text('Display Pot', 0, 0)
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# draw a hbar at the top yPos, height
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draw_hbar(xPos, 10, 2)
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oled.text("X Pos: " + str(xPos), 0, 56)
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oled.show()
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counter = 0
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# repeat forever
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while True:
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potVal = int(POT_PIN.read_u16())
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xPos = map(potVal, 0, POT_MAX, 0, WIDTH)
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update_display(xPos)
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led.toggle()
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sleep(.1)
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counter += 1

‎src/kits/pwm-display/display-pot-bar.py

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# Display a PWM waveform on a 128x64 OLED Display
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from machine import Pin, ADC, SPI
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from utime import sleep
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import ssd1306
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# this is the built-in LED on the Pico
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led = Pin('LED', Pin.OUT)
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WIDTH = 128
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HEIGHT = 64
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HALF_HEIGHT = HEIGHT // 2
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clock=Pin(2)
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data=Pin(3)
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RES = Pin(4)
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DC = Pin(5)
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CS = Pin(6)
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spi=SPI(0, sck=clock, mosi=data)
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oled = ssd1306.SSD1306_SPI(WIDTH, HEIGHT, spi, DC, RES, CS)
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POT_PIN = ADC(26)
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POT_MAX = 65536
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# map a value from one rante into another range
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# checks for divide by zero
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def map(value, istart, istop, ostart, ostop):
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# check ff (istop - istart)
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if (istop - istart) == 0:
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return ostop
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else:
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return int(ostart + (ostop - ostart) * ((value - istart) / (istop - istart)))
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# draw a horizontal bar
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def draw_hbar(inval, yPos, barHeight):
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oled.fill_rect(0, yPos, inval, barHeight, 1) # fill with 1s
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def update_display(xPos):
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oled.fill(0)
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oled.text('Display Pot', 0, 0)
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# draw a hbar at the top yPos, height
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draw_hbar(xPos, 10, 2)
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oled.text("X Pos: " + str(xPos), 0, 56)
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oled.show()
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counter = 0
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# repeat forever
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while True:
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potVal = int(POT_PIN.read_u16())
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xPos = map(potVal, 0, POT_MAX, 0, WIDTH)
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update_display(xPos)
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led.toggle()
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sleep(.1)
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counter += 1

‎src/kits/pwm-display/display-pwm.py

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# Display a PWM waveform on a 128x64 OLED Display
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from machine import Pin, ADC, SPI
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from utime import sleep
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import ssd1306
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# this is the built-in LED on the Pico
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led = Pin('LED', Pin.OUT)
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WIDTH = 128
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HEIGHT = 64
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HALF_HEIGHT = HEIGHT // 2
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clock=Pin(2)
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data=Pin(3)
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RES = Pin(4)
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DC = Pin(5)
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CS = Pin(6)
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spi=SPI(0, sck=clock, mosi=data)
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oled = ssd1306.SSD1306_SPI(WIDTH, HEIGHT, spi, DC, RES, CS)
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POT_PIN = ADC(26)
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POT_MAX = 65536
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# map a value from one rante into another range
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# checks for divide by zero
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def map(value, istart, istop, ostart, ostop):
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# check ff (istop - istart)
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if (istop - istart) == 0:
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return ostop
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else:
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return int(ostart + (ostop - ostart) * ((value - istart) / (istop - istart)))
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# draw a horizontal bar
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def draw_hbar(inval, yPos, barHeight):
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oled.fill_rect(0, yPos, inval, barHeight, 1) # fill with 1s
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# draw a square wave
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def draw_pulse_wave(dutyCycle, yOffset):
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pulses = 5
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square_wave_height = 20
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sq_wave_period = WIDTH // pulses
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high_length = int(dutyCycle * sq_wave_period / 100)
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# half the square wave period
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hswp = sq_wave_period // 2
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for i in range(0,pulses+1):
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# top bar
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oled.hline(i*sq_wave_period, yOffset-square_wave_height, high_length, 1)
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# down line
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oled.vline(i*sq_wave_period + high_length, yOffset-square_wave_height, square_wave_height, 1)
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# up line
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oled.vline(i*sq_wave_period + yOffset-square_wave_height-2, yOffset-square_wave_height+1, square_wave_height, 1)
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# bottem bar
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oled.hline(i*sq_wave_period - (sq_wave_period - high_length), yOffset, sq_wave_period-high_length, 1)
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# oled.text(str(high_length), 64, 56)
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def update_display(counter, xPos, dutyCycle):
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oled.fill(0)
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oled.text('Pulse Width Modu', 0, 0)
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# draw a hbar at the top yPos, height
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draw_hbar(xPos, 10, 2)
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draw_pulse_wave(dutyCycle, HALF_HEIGHT+15)
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# oled.hline(0, HALF_HEIGHT+15, WIDTH, 1)
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oled.text("Duty Cycle: " + str(round(dutyCycle)), 0, 56)
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oled.show()
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counter = 0
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# repeat forever
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while True:
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potVal = int(POT_PIN.read_u16())
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xPos = map(potVal, 0, POT_MAX, 0, WIDTH)
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# duty cycle is a float
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dutyCycle = int(xPos / WIDTH * 100)
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update_display(counter, xPos, dutyCycle)
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led.toggle()
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sleep(.1)
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counter += 1

‎src/kits/pwm-display/display-test-47.py

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from machine import Pin
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from utime import sleep
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import ssd1306
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# this is the built-in LED on the Pico
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led = Pin('LED', Pin.OUT)
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WIDTH = 128
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HEIGHT = 64
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clock=Pin(2)
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data=Pin(3)
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RES = machine.Pin(4)
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DC = machine.Pin(5)
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CS = machine.Pin(6)
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spi=machine.SPI(0, sck=clock, mosi=data)
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oled = ssd1306.SSD1306_SPI(WIDTH, HEIGHT, spi, DC, RES, CS)
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def update_display(counter):
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oled.fill(0)
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oled.text('Running', 0, 0)
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oled.text("Dan McCreary's", 0, 10)
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oled.text('Robot Lab 47', 0, 20)
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oled.text(str(counter), 0, 30)
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oled.show()
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counter = 0
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# repeat forever
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while True:
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update_display(counter)
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led.toggle()
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sleep(.5)
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counter += 1

‎src/kits/pwm-display/main.py

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# Display a PWM waveform on a 128x64 OLED Display
2+
3+
from machine import Pin, ADC
4+
from utime import sleep
5+
import ssd1306
6+
7+
# this is the built-in LED on the Pico
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led = Pin('LED', Pin.OUT)
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WIDTH = 128
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HEIGHT = 64
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HALF_HEIGHT = HEIGHT // 2
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clock=Pin(2)
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data=Pin(3)
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RES = machine.Pin(4)
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DC = machine.Pin(5)
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CS = machine.Pin(6)
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spi=machine.SPI(0, sck=clock, mosi=data)
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oled = ssd1306.SSD1306_SPI(WIDTH, HEIGHT, spi, DC, RES, CS)
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POT_PIN = ADC(26)
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POT_MAX = 65536
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# map a value from one rante into another range
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# checks for divide by zero
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def map(value, istart, istop, ostart, ostop):
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# check ff (istop - istart)
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if (istop - istart) == 0:
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return ostop
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else:
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return int(ostart + (ostop - ostart) * ((value - istart) / (istop - istart)))
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# draw a horizontal bar
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def draw_hbar(inval, yPos, barHeight):
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oled.fill_rect(0, yPos, inval, barHeight, 1) # fill with 1s
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# draw a square wave
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def draw_pulse_wave(dutyCycle, yOffset):
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pulses = 5
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square_wave_height = 20
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sq_wave_period = WIDTH // pulses
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high_length = int(dutyCycle * sq_wave_period / 100)
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# half the square wave period
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hswp = sq_wave_period // 2
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for i in range(0,pulses+1):
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# top bar
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oled.hline(i*sq_wave_period, yOffset-square_wave_height, high_length, 1)
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# down line
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oled.vline(i*sq_wave_period + high_length, yOffset-square_wave_height, square_wave_height, 1)
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# up line
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oled.vline(i*sq_wave_period + yOffset-square_wave_height-2, yOffset-square_wave_height+1, square_wave_height, 1)
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# bottem bar
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oled.hline(i*sq_wave_period - (sq_wave_period - high_length), yOffset, sq_wave_period-high_length, 1)
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# oled.text(str(high_length), 64, 56)
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def update_display(counter, xPos, dutyCycle):
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oled.fill(0)
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oled.text('Pulse Width Modu', 0, 0)
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# draw a hbar at the top yPos, height
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draw_hbar(xPos, 10, 2)
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draw_pulse_wave(dutyCycle, HALF_HEIGHT+15)
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# oled.hline(0, HALF_HEIGHT+15, WIDTH, 1)
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oled.text("Duty Cycle: " + str(round(dutyCycle)), 0, 56)
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oled.show()
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counter = 0
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# repeat forever
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while True:
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potVal = int(POT_PIN.read_u16())
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xPos = map(potVal, 0, POT_MAX, 0, WIDTH)
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# duty cycle is a float
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dutyCycle = int(xPos / WIDTH * 100)
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update_display(counter, xPos, dutyCycle)
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led.toggle()
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sleep(.1)
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counter += 1

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