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BPI-PicoW-S3使用双轴摇杆[CircuitPython]

菜鸟
2022-11-18 16:23:46     打赏


img

BPI-Pico-S3 与 Raspberry Pi Pico 板尺寸相同,搭载ESP32S3芯片,8M flash,4层PCB,电镀半孔工艺,陶瓷天线,支持 2.4 GHz Wi-Fi 和 Bluetooth® LE 双模无线通信,是一款专为物联网开发和Maker DIY设计的开发板。

出厂内置 tinyUF2 + CircuitPython,推荐使用Mu编辑器上手CircuitPython开发。

BiliBili视频 https://www.bilibili.com/video/BV1zt4y1N7Je

硬件接口示意图

img

使用双轴摇杆

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这是一个常见的双轴XY摇杆模块,使用了两个电位器最为其核心器件,通过芯片的ADC 模/数转换器 读取它们各自的电压数值,即可将读数转化为其在XY坐标轴上的位置。

双轴摇杆BPI-PicoW-S3

GNDGND
+5V3V3
VRxGP26_A0
VRYGP27_A1
  1. 在CircuitPython中提供的ADC精度是16bit,即最大值的16进制表达为 FFFF,10进制表达为 65535,对应的电压量程为0mv ~ 3300mv。BPI-PicoW-S3所使用的EPS32S3芯片实际ADC电压量程为0mv ~ 3100mv,所以实际应用时仅能测量到3100mv。

  1. 基础ADC读数,读取两个电位器的数值,转换为电压数值。

import board,analogio,time

x_axis_pin = analogio.AnalogIn(board.A0)
y_axis_pin = analogio.AnalogIn(board.A1)

while True:
   x_axis = x_axis_pin.value
   y_axis = y_axis_pin.value
   # print((x_axis,y_axis))
   x_value = x_axis / 65535 * 3300
   y_value = y_axis / 65535 * 3300
   print("{0}mv,{1}mv".format(x_value,y_value))
   time.sleep(0.1)
  1. 在Mu编辑器中,点击Plotter图标即可显示绘图仪,可以实时将REPL输出的数值显示为与时间相关的折线图。

img

  1. 以下程序可实现校准坐标零点的功能。开始运行的前五秒,请静止摇杆等待获取零点数值。

import board,analogio,time

x_axis_pin = analogio.AnalogIn(board.A0)
y_axis_pin = analogio.AnalogIn(board.A1)

def get_zero(times =500, sleep = 0.01):
   x_total = 0
   y_total = 0
   for i in range (times):
       x_axis = x_axis_pin.value
       y_axis = y_axis_pin.value
       x_total += x_axis
       y_total += y_axis
       time.sleep(sleep)
   x_zero = x_total // times
   y_zero = y_total // times
   return (x_zero,y_zero)

zero = get_zero(times =500, sleep = 0.01)
print(zero)

while True:
   x_axis = x_axis_pin.value - zero[0]
   y_axis = y_axis_pin.value - zero[1]
   print((x_axis,y_axis))
   time.sleep(0.1)
  1. 以下程序可获取摇杆方向,这是双轴摇杆最常见的应用。

import board,analogio,time

x_axis_pin = analogio.AnalogIn(board.A0)
y_axis_pin = analogio.AnalogIn(board.A1)

direction_list = ["East","Southeast","South","Southwest","West","Northwest","North","Northeast","Centre"]

def get_zero(times =500, sleep = 0.01):
   x_total = 0
   y_total = 0
   for i in range (times):
       x_axis = x_axis_pin.value
       y_axis = y_axis_pin.value
       x_total += x_axis
       y_total += y_axis
       time.sleep(sleep)
   x_zero = x_total // times
   y_zero = y_total // times
   return (x_zero,y_zero)

def get_direction(zero = (32767,32767)):
   x_axis = x_axis_pin.value - zero[0]
   y_axis = y_axis_pin.value - zero[1]
   if x_axis >= 10000 and -10000 < y_axis < 10000:
       return direction_list[0]
   elif x_axis >= 10000 and y_axis <= -10000:
       return direction_list[1]
   elif -10000 < x_axis < 10000 and y_axis <= -10000:
       return direction_list[2]
   elif x_axis <= -10000 and y_axis <= -10000:
       return direction_list[3]
   elif x_axis <= -10000 and -10000 < y_axis < 10000:
       return direction_list[4]
   elif x_axis <= -10000 and y_axis >= 10000:
       return direction_list[5]
   elif -10000 < x_axis < 10000 and y_axis >= 10000:
       return direction_list[6]
   elif x_axis >=10000 and y_axis >= 10000:
       return direction_list[7]
   else :
       return direction_list[8]

zero = get_zero(times =50, sleep = 0.01)
print(zero)

while True:
   x_axis = x_axis_pin.value - zero[0]
   y_axis = y_axis_pin.value - zero[1]
   print((x_axis,y_axis))
   print(get_direction(zero = zero))
   time.sleep(0.1)
  1. 以下程序可设置坐标精度等级,计算每级跨度,可以按需求消除抖动,增强数据的实用性。

import board,analogio,time

x_axis_pin = analogio.AnalogIn(board.A0)
y_axis_pin = analogio.AnalogIn(board.A1)

def get_zero(times =500, sleep = 0.01):
   x_total = 0
   y_total = 0
   for i in range (times):
       x_axis = x_axis_pin.value
       y_axis = y_axis_pin.value
       x_total += x_axis
       y_total += y_axis
       time.sleep(sleep)
   x_zero = x_total // times
   y_zero = y_total // times
   return (x_zero,y_zero)

def get_extremum(times =500, sleep = 0.01):
   x_list = []
   y_list = []
   for i in range (times):
       x_axis = x_axis_pin.value
       y_axis = y_axis_pin.value
       x_list.append(x_axis)
       y_list.append(y_axis)
       time.sleep(sleep)
   x_extremum = (min(x_list),max(x_list))
   y_extremum = (min(y_list),max(y_list))
   return (x_extremum,y_extremum)
   
def get_spacing(level = 16 , zero =(32767,32767) ,x_extremum = (0,65535),y_extremum = (0,65535)):
   x_temp_1 = (zero[0] - x_extremum[0]) // level
   x_temp_2 = (x_extremum[1] - zero[0] ) // level
   y_temp_1 = (zero[1] - y_extremum[0]) // level
   y_temp_2 = (y_extremum[1] - zero[1] ) // level
   x_spacing = (x_temp_1,x_temp_2)
   y_spacing = (y_temp_1,y_temp_2)
   return (x_spacing,y_spacing)

def get_coordinates(zero = (32767,32767), x_spacing = (2048,2048),y_spacing = (2048,2048)):
   x_value = x_axis_pin.value - zero[0]
   y_value = y_axis_pin.value - zero[1]
   if x_value >= 0:
       x_axis = x_value // x_spacing[1]
   else:
       x_axis = - ((-x_value) // x_spacing[0])
   if y_value >= 0:
       y_axis = y_value // y_spacing[1]
   else:
       y_axis = - ((-y_value) // y_spacing[0])
   return (x_axis,y_axis)
   
zero = get_zero(times =500, sleep = 0.01)
print(zero)
(x_extremum,y_extremum) = get_extremum(times = 500, sleep = 0.01)
print((x_extremum, y_extremum))
(x_spacing,y_spacing) = get_spacing(level = 128 , zero = zero, x_extremum = x_extremum,y_extremum = y_extremum)
print((x_spacing, y_spacing))

while True:
   coordinates = get_coordinates(zero = zero, x_spacing = x_spacing, y_spacing = y_spacing)
   print(coordinates)
   time.sleep(0.1)

BPI-PicoW-S3 + CircuitPython 教程聚合链接:https://forum.banana-pi.org.cn/t/topic/3986?u=wind_

BPI-PicoW-S3 wiki 页面:https://wiki.banana-pi.org/BPI-PicoW-S3_开发板)

购买BPI-PicoW-S3

  • 比派科技官方速卖通店铺:https://www.aliexpress.com/item/1005004775634442.html

  • SinoVoip 官方速卖通店铺:https://www.aliexpress.com/item/1005004775859077.html

  • 官方淘宝店铺:https://item.taobao.com/item.htm?spm=a2126o.success.0.0.25b04831CHV1Nc&id=684134360199

  • OEM&OEM 定制服务: sales@banana-pi.com





关键词: BPI-PicoW-S3     CircuitPytho    

专家
2022-11-19 08:10:11     打赏
2楼

感谢楼主的分享


高工
2022-11-19 08:19:22     打赏
3楼

感谢楼主的分享


高工
2022-11-19 08:57:58     打赏
4楼

谢谢分享


专家
2022-11-19 09:06:43     打赏
5楼

学习一下


专家
2022-11-19 09:55:58     打赏
6楼

看看


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