2/17/2023 0 Comments Anti clockwise![]() ![]() This is because in the Northern Hemisphere, the Sun’s movement is seen as moving from left to right. The Northern Hemisphere is the part of the planet where the direction would be what we know today as “clockwise”. Of course depending on where you are on the planet, the direction these shadows move in will be different. This is all determined by the rotation of the earth. The position of the shadow on the dial marked the time of day. Sundials worked by measuring time based on the shadow cast by the sun on the dial. Part of the answer to this question actually dates back to earlier methods of timekeeping. Why Do Watches Traditionally Run In A “Clockwise” Direction? I think that the first question to ask is, why do watches run “clockwise” anyway? Who decided which way a watch or clock is going to run? When was this decided, and why? These are the questions we must first answer, before we even talk about why you would have an anticlockwise watch. Most likely many have never even seen a clock or a watch that runs in the opposite direction from the norm. So you may be wondering, why even make or have a watch that runs in reverse? This goes against everything we have ever known about clocks and watches. Simply put, an anticlockwise watch, is a watch whose hands tick in the opposite direction as opposed to a traditional watch. But first I’ll briefly describe what an anticlockwise watch even is. If you ever even hear about this at all, it may also be referred to as a reverse watch, or a backwards watch, etc. So when the distance is NOT 60, eg in say the switch case default section, you set the flag false.In today’s article we will be talking about the anticlockwise watch. Then next time through loop(), since the flag is true, the if(!moveDone) test fails and no movement.īUT you need to set that flag back to false somewhere otherwise you'll never get any movement ever again, the next time the distance is 60. Then still inside that if, once you did the movement, you set that flag as true. Then in the 60 case, you have your movement code inside an if(!moveDone), where the ! means not, so that translates as "if not moveDone". So what you need to do is have a boolean flag called say "moveDone" which you initialise false. The behaviour is due to the nature of loop(), coming back to the switch.case again and again, so if the case is still 60, it does the movement sequence again. THIS MUST HAPPEN ONLY ONCE IF THE VALUE IS DETECTED…BUT THE THE MOTOR ROTATES CLOCKWISE AND ANTICLOCKWISE AGAIN AND AGAIN…WHAT SHALL I DO? MY OBJECTIVE IS :IF THE VALUE"cm=60" IS DETECTED THE STEPPER MOTOR MUST ROTATE CLOCKWISE AND AFTER A DELAY IT MUST ROTATE TO ANTI CLOCKWISE. object we take half of the distance travelled. The ping travels out and back, so to find the distance of the The speed of sound is 340 m/s or 29 microseconds per centimeter. Long microsecondsToCentimeters(long microseconds) and return, so we divide by 2 to get the distance of the obstacle. This gives the distance travelled by the ping, outbound According to Parallax’s datasheet for the PING))), there are Long microsecondsToInches(long microseconds) step one revolution in the other direction: of the ping to the reception of its echo off of an object.Ĭm = microsecondsToCentimeters(duration) duration is the time (in microseconds) from the sending Read the signal from the sensor: a HIGH pulse whose Give a short LOW pulse beforehand to ensure a clean HIGH pulse: The sensor is triggered by a HIGH pulse of 10 or more microseconds. and the distance result in inches and centimeters: establish variables for duration of the ping, Stepper myStepper(stepsPerRevolution, 8, 9, 10, 11) initialize the stepper library on pins 8 through 11: Const int stepsPerRevolution = 200 // change this to fit the number of steps per revolution ![]()
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