class WheelChairController:
def __init__(self):
#channel numbers
self.errorLightOut = 4
self.errorLightLow = 18
self.switchOut = 13
self.switchDetect = 20
#constants
self.rs_stopped = 0
self.rs_forward = 1
self.rs_reverse = 2
self.ss_nothing = 0 #nothing has happened yet
self.ss_start = 1 #both eyes open complete
self.ss_forward1 = 2 #one eye open complete
self.ss_forward2 = 3 #both eyes closed complete
self.ss_reverse1 = 4 #both eyes closed complete
self.redFac = .75
self.addFac = 1 - self.redFac
self.maxSwitchTime = 7 #leave room for waiting and messing up
self.maxReverseTime = 5
self.defaultPrevX = 0
self.defaultPrevY = -.5
#vars
self.runState = self.rs_stopped
self.runTime = 0
self.switchState = self.ss_nothing
self.switchTime = 0
self.prevX = self.defaultPrevX
self.prevY = self.defaultPrevY
self.joystick = Joystick()
io.setmode(io.BCM)
io.setup(self.errorLightOut, io.OUT, initial=io.LOW)
io.setup(self.errorLightLow, io.OUT, initial=io.LOW)
io.setup(self.switchOut, io.OUT, initial=io.HIGH)
io.setup(self.switchDetect, io.IN, pull_up_down=io.PUD_DOWN)
time.sleep(.2) #wait for io to definitely turn on before attempting to sense
if self.should_shut_down():
print("waiting for switch on")
io.wait_for_edge(self.switchDetect, io.RISING) #wait for switch to turn on.
self.set_led(io.HIGH) #indicate success
time.sleep(.3) #wait so people know for sure that its working
def sig_no_eye(self, now):
#print("sig no eye")
pass #probs just for debugging
def sig_direction(self, x, y):
#print("go ", x, ", ", y)
self.prevX = self.prevX * self.redFac + x * self.addFac
self.prevY = self.prevY * self.redFac + y * self.addFac
if self.runState == self.rs_forward:
self.joystick.forward(self.prevX, self.prevY)
def sig_error_reset(self):
#print("turn on error light")
self.joystick.stop()
self.set_led(io.HIGH)
def sig_turn_off_error_light(self):
self.set_led(io.LOW)
def process_blink_commands(self, useGroups, now):
temp = sorted(useGroups, key=lambda group: group.boxCenterX)
eyes = len(useGroups)
isLeft = True
left = False
right = False
for group in temp:
if group.lastOpen == now:
if isLeft:
left = True
isLeft = False
else:
right = True
self.joystick.showEyes(left, right)
counts1 = self.count_blinks(useGroups, 1, now) #be, bd, ne, nd
if now - self.switchTime > self.maxSwitchTime and not (self.switchState == self.ss_start and counts1[3] == 2): # don't timeout if during start (because that would be confusing) if eyes are mostly open still
if self.switchState != self.ss_nothing:
print("canceled switch due to timeout")
self.switchState = self.ss_nothing
if (self.runState == self.rs_reverse and now - self.runTime > self.maxReverseTime) or eyes == 0:
self.stop(now)
print("no eye stop")
elif eyes == 2: #other eyes == 1 case is just continue forward
countsHalf = self.count_blinks(useGroups, .5, now)
if self.runState == self.rs_forward:
if counts1[3] < 2 or countsHalf[1] == 2: #not both ~open1 or both =closed.5
self.stop(now)
print("forward stop")
elif self.runState == self.rs_reverse:
if counts1[3] == 2 or countsHalf[1] == 2: #both ~open1 or both =closed.5
self.stop(now)
print("reverse stop")
elif self.runState == self.rs_stopped:
if self.switchState == self.ss_nothing:
if counts1[2] == 2: #both =open1
self.switchState = self.ss_start
print("ss_start")
self.switchTime = now
else:
print("still nothing")
elif self.switchState == self.ss_start:
if counts1[0] == 2: #both =closed1
self.switchState = self.ss_reverse1
self.switchTime = now
print("ss_reverse1")
elif counts1[1] == 1 and counts1[3] == 1: #one ~open1, one ~closed1
self.switchState = self.ss_forward1
self.swtichTime = now
print("ss_forward1")
else:
print("still start")
elif self.switchState == self.ss_reverse1:
if counts1[1] == 1 and counts1[3] == 1: #one ~open1, one ~closed1
self.start_reverse(now)
elif counts1[2] == 2: #both =open1
self.switchState = self.ss_start
self.switchTime = now
print("cancel")
else:
print("still reverse1")
elif self.switchState == self.ss_forward1:
if counts1[0] == 2: #both =closed1
self.switchState = self.ss_forward2
self.switchTime = now
print("ss_forward2")
elif counts1[2] == 2: #both =open1
self.switchState = self.ss_start
self.switchTime = now
print("cancel")
else:
print("still forward1")
elif self.switchState == self.ss_forward2:
if counts1[2] == 2: #both =open1
self.start_forward(now)
elif counts1[0] == 1 and counts1[2] == 1: #one =open1, one =closed1
self.switchState = self.ss_start
self.switchTime = now
print("cancel")
else:
print("still forward2")
else:
#something went terribly wrong
print("aww nuts")
self.stop(now)
else:
#something went terribly wrong
print("awww nutz")
self.stop(now)
def count_blinks(self, useGroups, timeReq, now):
#return format: [blinking_exact, blinking_denoised, notBlinking_exact, notBlinking_denoised]
be = sum((now - group.lastOpen) > timeReq for group in useGroups)
bd = sum((now - group.lastDefOpen) > timeReq for group in useGroups)
ne = sum((now - group.lastClosed) > timeReq for group in useGroups)
nd = sum((now - group.lastDefClosed) > timeReq for group in useGroups)
return [be, bd, ne, nd]
def stop(self, now):
self.runState = self.rs_stopped
self.switchState = self.ss_nothing
self.joystick.stop()
self.runTime = now
def start_forward(self, now):
self.runState = self.rs_forward
self.switchState = self.ss_nothing
self.joystick.forward(self.prevX, self.prevY)
self.runTime = now
print("start forward")
def start_reverse(self, now):
self.runState = self.rs_reverse
self.switchState = self.ss_nothing
self.joystick.reverse()
self.runTime = now
print("start reverse")
def should_shut_down(self):
return io.input(self.switchDetect) == io.LOW
def set_led(self, state):
io.output(self.errorLightOut, state)
def release_assets(self):
print("releasing all assets")
self.joystick.stop()
self.joystick.shutdown()
io.cleanup()
