追小球的云台代码。联机时,舵机能180度跟随。而脱机时,舵机只能转半圈。
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占空比的限制也调过了,联机的时候一直很正常,但是一旦脱机就只能转动半边,另一边没反应。一开始以为P调小了 但是调过P也没反应 ,代码如下。
import sensor, image, time from pid import PID from pyb import Servo from pyb import UART import json pan_servo=Servo(1) pan_servo.calibration(500,2500,500) red_threshold = (21, 100, -82, -28, -73, 59) #pan_pid = PID(p=0.07, i=0, imax=90) #脱机运行或者禁用图像传输,用这个 pan_pid = PID(p=1.5, i=0, imax=90)#在线调试使用这个PID sensor.reset() # Initialize the camera sensor. sensor.set_pixformat(sensor.RGB565) # use RGB565. sensor.set_framesize(sensor.QVGA) # use QQVGA for speed. sensor.skip_frames(10) # Let new settings take affect. sensor.set_auto_whitebal(False) # turn this off. clock = time.clock() # Tracks FPS. uart = UART(3, 9600) K=1911 def find_max(blobs): max_size=0 for blob in blobs: if blob[2]*blob[3] > max_size: max_blob=blob max_size = blob[2]*blob[3] return max_blob while(True): clock.tick() # Track elapsed milliseconds between snapshots(). img = sensor.snapshot() # Take a picture and return the image. blobs = img.find_blobs([red_threshold]) if blobs: max_blob = find_max(blobs) pan_error = max_blob.cx()-img.width()/2 # output_str=bytearray([max_blob.cx(),max_blob.cy()]) # output_str="%d" % (pan_servo.angle()) # uart.write(output_str+'\r\n') # print("pan_error: ", pan_error) img.draw_rectangle(max_blob.rect()) # rect img.draw_cross(max_blob.cx(), max_blob.cy()) # cx, cy Lm = (max_blob.w()+max_blob.h())/2 length = K/Lm #output_str="%d" % (length) #uart.write(output_str) # uart.write(output_str+'\r\n') # print(length) uart.writechar(int(length)) pan_output=pan_pid.get_pid(pan_error,1)/2 # print("pan_output",pan_output) pan_servo.angle(pan_servo.angle()+pan_output)
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电脑调试的时候,右上角,禁用framebuffer,就是和脱机一样的。看一下效果。