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raspberry_pi/gps_homing.py

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+from lib import rover_gps as GPS
+from lib import servo
+from lib import MPU6050 as MPU
+import math
+import time
+import queue
+
+#画像誘導に切り替える距離(km)
+cam_dis = 0.01
+
+dutyL = 9.0
+dutyR = 9.0
+
+#PID
+M = 0.00 
+M1 =  0.00 
+goal = 0.00  
+e = 0.00 
+e1 = 0.00 
+e2 = 0.00 
+Kp = 0.1 
+Ki = 0.1 
+Kd = 0.1
+
+#goalの座標
+#goal_lat =
+#goal_lng = 
+
+#位置座標を保存
+position_memo = queue.Queue()
+
+#回転角度
+def cal_rotation_angle(preT,pre_gyro):
+    nowT = time.time()　#現在時刻
+    now_gyro = MPU.get_gyro_data_lsb()[2] #現在の角速度
+
+    #積分して回転角度を求める
+    now_rotation_angle = (now_gyro + pre_gyro) * (nowT - preT) / 2
+    return [nowT, now_gyro, now_rotation_angle]
+
+def cal_average(x):
+    sum = 0
+    for i range(5):
+        sum += x[i]
+    return sum / 5
+
+#着地
+pre = [None, None]
+while pre is None:
+    pre = GPS.lat_long_measurement()
+
+#5回座標が取れるまで進む
+with servo(pinL) as svL, servo(pinR) as svR:
+    svL.rotate(dutyL)
+    svR.rotate(dutyR)
+
+for i in range(5):
+    now = [None, None]
+    while now is None:
+        now = GPS.lat_long_measurement()
+    position_memo.put(GPS.convert_lat_long_to_r_theta(pre[0], pre[1], now[0], now[1]))
+    pre = now
+
+#現在の方位角
+now_azimuth = cal_average(position_memo)
+#回転角度
+rotation_angle = now_azimuth
+
+#goalまでの距離と方位角
+to_goal = [None, None]
+while (to_goal[0] is None) or (to_goal[1] is None)
+    to_goal = GPS.r_theta_to_goal(goal_lat, goal_long)
+
+#goal方角と進んでいる方角の差
+difference = to_goal[1]    
+
+#goalとの距離が10m以下になったら画像での誘導
+while to_goal[0] > cam_dis:
+
+    now = [None, None]
+    now = GPS.lat_long_measurement()
+    if now[0] != None or now[1] != None:
+
+        position_memo.get()
+        position_memo.put(GPS.convert_lat_long_to_r_theta(pre[0], pre[1], now[0], now[1]))
+
+        pre = now
+
+        #現在向いている方角
+        #azimuth（方位角）
+        now_azimuth = cal_average(position_memo)
+        #回転角度
+        rotation_angle = now_azimuth
+
+    else:
+        #回転
+        preT = time.time()
+        pre_gyro = math.radians(MPU.get_gyro_data_lsb()[2]) #degree to radian
+
+        preT, pre_gyro, now_rotation_angle = cal_rotation_angle(preT, pre_gyro)
+        rotation_angle += now_rotation_angle
+
+    #goalまでの距離と方位角
+    to_goal = GPS.r_theta_to_goal(goal_lat, goal_long)
+    #goal方角と進んでいる方角のずれ
+    difference = to_goal[1] - rotation_angle 
+
+    #dutyLを変える
+    M1 = M
+    e1 = e
+    e2 = e1
+    e = goal - M
+    M = M1 + Kp * (e-e1) + Ki * e + Kd * ((e-e1) - (e1-e2))
+
+    if difference < math.pi and difference > -math.pi:
+        zenshin = 1
+    else:
+        zenshin = 0
+
+    if M > 1:
+        M = 1
+    if M < -1:
+        M = -1
+
+    dutyL = 7.5 + 2.5*((zenshin + M) / 2)
+    dutyR = 7.5 + 2.5*((zenshin - M) / 2)
+
+    with servo(pinL) as svL, servo(pinR) as svR:
+        svL.rotate(dutyL)
+        svR.rotate(dutyR)