补充【得捷电子Follow Me第二期】

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补充【得捷电子Follow Me第二期】 [复制链接]

 

这个帖子是补充 [得捷电子Follow Me第二期提交任务](https://bbs.eeworld.com.cn/thread-1263126-1-1.html) 的NUA7802 ADC模块的使用，选择在任务3中进行补充。 ### 任务3：控制WS2812B > 任务要求：使用按键控制板载`NeoPixel LED` 的显示和颜色切换 - 本次任务使用到了板载的按键、`NeoPixel LED`和额外的ADC模块，程序逻辑为开发板驱动ADC模块进行采集，当ADC模块采集的信号超出阈值时，变化板载`NeoPixel LED`的颜色，同时当检测到按键按下时，固定当前的屏幕显示和板载LED的颜色，再次按下按键时，继续进行采集。 - 准备工作： 因为新增了ADC模块使用，所以需要准备好[adafruit-circuitpython-register](https://github.com/adafruit/Adafruit_CircuitPython_Register/releases)和[circuitpython-nau7802](https://github.com/adafruit/CircuitPython_NAU7802/releases/tag/2.1.1)这两个库，将它们放到开发板的`/lib`目录下。 - `code.py`代码如下： ```python # 导入所需模块 import board import time import displayio from digitalio import DigitalInOut, Direction, Pull import neopixel from adafruit_led_animation.animation.blink import Blink from adafruit_led_animation.color import JADE, BLACK, ORANGE, GOLD, OLD_LACE,RED from adafruit_display_text import label from adafruit_bitmap_font import bitmap_font from cedargrove_nau7802 import NAU7802 pixel_pin = board.NEOPIXEL num_pixels = 1 led_color = 0 # 初始化像素灯 pixels = neopixel.NeoPixel( pixel_pin, num_pixels, brightness=0.2, auto_write=False, pixel_order=neopixel.GRB ) # 配置ADC模块 nau7802 = NAU7802(board.I2C(), address=0x2A, active_channels=1) # 定义ADC初始化所需函数 def zero_channel(): nau7802.calibrate("INTERNAL") nau7802.calibrate("OFFSET") def read_raw_value(samples=2): sample_sum = 0 sample_count = samples while sample_count > 0: while not nau7802.available(): pass sample_sum = sample_sum + nau7802.read() sample_count -= 1 return int(sample_sum / samples) blink = Blink(pixels, speed=0.5, color=RED) btn = DigitalInOut(board.BOOT0) btn.direction = Direction.INPUT btn.pull = Pull.UP screen = board.DISPLAY text = displayio.Group() font = bitmap_font.load_font("/font/fusion_pixel.pcf") text_0 = "红色" text_color = RED bt_status = 1 bt_cnt = 0 # 使能nau7802数字和模拟电源 enabled = nau7802.enable(True) time.sleep(2) # 校准和归零通道1 nau7802.channel = 1 zero_channel() while True: # 当检测到按键按下时，判断系统下次运行状态 if not btn.value: time.sleep(0.1) if not btn.value & bt_cnt: bt_status = not bt_status bt_cnt = 0 else: pass if bt_status: nau7802.channel = 1 value = read_raw_value() if value > 300 & value < 3000: text_color = JADE elif value < 300 & value > -3000: text_color = ORANGE elif alue < -3000 & value > -6000: text_color = GOLD elif value < -6000 & value > -8000: text_color = OLD_LACE elif value < -8000 & value > -10000: text_color = RED else: pass blink = Blink(pixels, speed=1, color=text_color) text_0 = "NAU7802 read is :\r\n %7.0f" %value text = displayio.Group() content_0 = label.Label(font, text=text_0,x=10, y=50, color = text_color, scale=3) text.append(content_0) screen.show(text) screen.refresh() time.sleep(0.1) # sleep for debounce # 执行led闪烁动态效果 blink.animate() bt_cnt = 1 else: time.sleep(0.1) ``` - 效果如下： - 使用手指靠近ADC模块的差分输入端，ADC的采样值会发生变化，LED颜色变成红色，按下按键后固定当前状态  - 将手指拿开ADC模块，按下按键，让系统采集ADC模块的值，LED随ADC的采样值变成绿色，再次按下按键固定当前值