BPI-Leaf-S3 用电位器无极调控彩灯亮度,ESP32-S3 & MicroPython


#1

BPI-Leaf-S3 的GPIO1~20可以使用ADC 模/数转换器,分辨率为12bit,最大可测量0~3V电压。

使用一块电位器即可应用ADC功能,例如设计一个无极调控彩灯亮度的程序。

20220802175558

Potentiometer Board
GND GND
VCC 3V3
S GPIO1

MicroPython

Micropython 运行环境搭建 - Banana Pi Wiki (banana-pi.org)

MicroPython ADC 文档

在上一篇 BPI-Leaf-S3 设计按键中断程序 控制彩灯的基础上,用ADC控制彩灯当前亮度。

from machine import Pin,ADC
from neopixel import NeoPixel
from array import array
import time
import micropython

adc1 = ADC(Pin(1),atten=ADC.ATTN_11DB)

micropython.alloc_emergency_exception_buf(100)

p_48 = Pin(48, Pin.OUT)
np = NeoPixel(p_48, 1,bpp=3, timing=1)

p0 = Pin(0,Pin.IN,Pin.PULL_UP)
trig_locks = array('B',[0])
trig_timeticks_list = array('L',[0,0])
count = array('L',[0])

def p0_irq(pin):
    if pin.value()==0 and trig_locks[0]==0:
        trig_timeticks_list[0]=time.ticks_ms()
        trig_locks[0]=1
    elif pin.value()==1 and trig_locks[0]==1:
        trig_timeticks_list[1]=time.ticks_diff(time.ticks_ms(),trig_timeticks_list[0])
        trig_locks[0]=0
        if trig_timeticks_list[1] >= 20:
            count[0] = count[0] + 1
            if count[0] > 8:
                count[0] = 0

p0.irq(handler=p0_irq,trigger= Pin.IRQ_FALLING | Pin.IRQ_RISING )

RED = (255, 0, 0)
ORANGE = (255, 100, 0)
YELLOW = (255, 255, 0)
GREEN = (0, 255, 0)
CYAN = (0, 255, 255)
BLUE = (0, 0, 255)
PURPLE = (180, 0, 255)
WHITE = (255, 255, 255)
OFF = (0, 0, 0)

color_list = [RED,ORANGE,YELLOW,GREEN,CYAN,BLUE,PURPLE,WHITE,OFF]

while True: 
    adc1_read = adc1.read() # 12bit
    adc1_read_mv = adc1.read_uv()/1000
    adc1_read_u16 = adc1.read_u16() # 16bit
    brightness = adc1_read/4095
    i = color_list[count[0]]
    color = (round(i[0]*brightness),round(i[1]*brightness),round(i[2]*brightness))
    np[0] = color
    np.write()
    print(adc1_read,adc1_read_u16,adc1_read_mv,"mv",count[0],color)
    time.sleep(0.1)

BPI-Leaf-S3 开发板 - Banana Pi Wiki (banana-pi.org)


BPI-Leaf-S3 OLED显示电位器电压与实时进度条,ESP32-S3 & MicroPython