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‎docs/advanced-labs/21-botton-callback.md

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# Button Callback
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```py
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import re
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def extract_gpio_pin(input_string):
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# Use a regular expression to find the GPIO number
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match = re.search(r"GPIO(\d+)", input_string)
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if match:
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# Convert the extracted number to an integer to remove leading zeros
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return int(match.group(1))
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else:
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# Return None if no match is found (or raise an exception if that's preferable)
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return None
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# Test the function with examples
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print(extract_gpio_pin("Pin(GPIO15, mode=IN, pull=PULL_UP)")) # Output: 15
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print(extract_gpio_pin("Pin(GPIO7, mode=IN, pull=PULL_UP)")) # Output: 7
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print(extract_gpio_pin("Pin(GPIO03, mode=IN, pull=PULL_UP)")) # Output: 3
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```
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https://chat.openai.com/share/6e6d8123-ed4d-4dc6-a915-030fe2245dfe

‎src/20-sound-test.py

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import machine
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import utime
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from machine import Pin, ADC, SPI
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import ssd1306
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# OLED display width and height
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WIDTH = 128
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HEIGHT = 64
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# SPI pins for OLED
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clock = Pin(2) # SCL
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data = Pin(3) # SDA
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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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# Initialize SPI and OLED Display
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spi = SPI(0, sck=clock, mosi=data)
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display = ssd1306.SSD1306_SPI(WIDTH, HEIGHT, spi, DC, RES, CS)
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# Initialize ADC for GPIO26 (ADC0)
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adc = ADC(Pin(26))
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min=64000
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def plot_signal():
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global min
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display.fill(0) # Clear the display
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old_x = 0
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old_y = HEIGHT // 2
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# For simplicity, we're plotting every other pixel
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for x in range(0, WIDTH):
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# Read from ADC (values will be from 0 to 4095)
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val = adc.read_u16()
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if val < min:
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min = val
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# print(val-min)
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# Scale the ADC value to fit the OLED height
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y = int(((val-min) / 500) * HEIGHT)
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# Invert y to plot correctly on the OLED
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y = HEIGHT - y
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# Draw a line from the last point to the new point
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display.line(old_x, old_y, x, y, 1)
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old_x, old_y = x, y
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display.show() # Update the display with the new data
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while True:
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plot_signal()
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utime.sleep(0.1) # Small delay to reduce flickering
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‎src/advanced/spectrum-analyzer/02-pot-gain.py

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import machine
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import utime
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from machine import Pin, ADC, SPI
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import ssd1306
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# OLED display width and height
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WIDTH = 128
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HEIGHT = 64
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# SPI pins for OLED
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clock = Pin(2) # SCL
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data = Pin(3) # SDA
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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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# Initialize SPI and OLED Display
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spi = SPI(0, sck=clock, mosi=data)
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display = ssd1306.SSD1306_SPI(WIDTH, HEIGHT, spi, DC, RES, CS)
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# Initialize ADC for sound input (GPIO26) and gain control (GPIO27)
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sound = ADC(Pin(26))
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gain = ADC(Pin(27))
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def plot_signal_with_gain():
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display.fill(0) # Clear the display
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old_x = 0
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old_y = HEIGHT // 2
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# Read gain control (potentiometer) value
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gain_value = gain.read_u16() + 1 # Adding 1 to avoid division by zero
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for x in range(0, WIDTH, 2):
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# Read from ADC (sound input)
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val = sound.read_u16()
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# Adjust the sound value based on the gain
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# Note: This scaling might need adjustment depending on your specific potentiometer and desired sensitivity
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adjusted_val = min(((val * gain_value) >> 16), 65535) # Ensure the adjusted value does not exceed ADC's max value
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# Scale the adjusted value to fit the OLED height
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y = int((adjusted_val / 65535) * HEIGHT)
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# Invert y to plot correctly on the OLED
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y = HEIGHT - y
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# Draw a line from the last point to the new point
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display.line(old_x, old_y, x, y, 1)
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old_x, old_y = x, y
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display.show() # Update the display with the new data
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while True:
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plot_signal_with_gain()
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utime.sleep(0.1) # Small delay to reduce flickering

‎src/advanced/spectrum-analyzer/23-average-plot.py

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import machine
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import utime
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from machine import Pin, ADC, SPI
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# https://docs.micropython.org/en/latest/esp8266/tutorial/ssd1306.html
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import ssd1306
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# OLED display width and height
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WIDTH = 128
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HEIGHT = 64
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# SPI pins for OLED
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clock = Pin(2) # SCL
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data = Pin(3) # SDA
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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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# Initialize SPI and OLED Display
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spi = SPI(0, sck=clock, mosi=data)
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display = ssd1306.SSD1306_SPI(WIDTH, HEIGHT, spi, DC, RES, CS)
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# Initialize ADC for GPIO26 (ADC0)
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adc = ADC(Pin(26))
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def plot_signal(new_val, min):
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# Scroll the display content to the left by one pixel
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display.scroll(-1, 0)
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y = HEIGHT - new_val//4
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if y > HEIGHT:
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y = HEIGHT
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if y < 0:
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y = 0
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for clear_y in range(HEIGHT):
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display.pixel(WIDTH - 2, y, 1)
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# Update the display with the new data
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# display.fill_rect(0, 54, 100, 63, 0)
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# display.text(str(min), 0, 54, 1)
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# display.text(str(new_val), 0, 54, 1)
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display.show()
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min = 53000
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avg = 50
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display.fill(0)
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while True:
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# add up the ave number of points
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val=0
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for i in range(0,avg):
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val += (adc.read_u16() - min)
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avg_val = val//avg
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# if the average val is negative, lower the minimum by that amoun
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if avg_val < 0:
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min += avg_val
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plot_signal(avg_val, min)
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# utime.sleep(0.1) # Small delay to reduce flickering
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