Serial.read() returns the first byte of incoming serial data available (or -1 if no data is available). void loop() ġ/ you don't check if there is a character coming from the Serial line.
If I simplify, your loop() looks like this. I don't see any logic problems that would cause the motor not to run the other way if the unrelated limit switch is pressed Sorry if these questions are obvious, I'm completely new to arduino
#How to program vex limit switch code#
Is the following a valid way to run a stepper motor? (This bit of code is what I placed in for the //stepper motor code bit) digitalWrite(9, LOW) Īnd lastly, I have the motor and the limit switches connected to a motor shield which is powered by a 9 volt battery. So I sorta think that my problem lies with the stepper motor code. I don't see any logic problems that would cause the motor not to run the other way if the unrelated limit switch is pressed. Here is all of my code (sorry if it's a bit long) #define switchA 10
I think I narrowed down what the problems could be, so I was hoping someone here could give some advice The trouble I am running into is that when a limit switch is pressed and the motor stops at that end, the motor won't run the opposite direction until the limit switch isn't pressed. My end goal is to have a stepper motor run forwards until it hits a limit switch when the number 1 is entered into the serial monitor, and to run backwards when the number 2 is entered in the same manner. The code for the motor would just look at the variable and move the motor if it is 'r' or 'l'Įarlier today I posted a question about stepper motors with limit switches and received a lot of great feedback. When it hits the right limit switch it should change to 'R' etc. If the state is (say) 'L' pressing the button should change it to 'r'. You should organize your program around a variable that records the state of the system - perhaps call it moveState - which might have possible values L (stopped at left), r (moving right), R (stopped at right) and l (lower case L - moving left). It would be much better to read the limit switch every time through loop() and stop the motors if necessary. If something gets mixed up the switches may never be detected and damage may be caused. While it is not the cause of your problem (I think) you code has one big failing - the limit switches are not read unless the user has pressed the correct button. Just make a pencil drawing showing the connections and post a photo of the drawing. I have ZERO idea what that wiring picture is intended to convey. I presume the code you posted is the exact code you have been trying? But I don't see why your code should behave like that. This usual cause of that problem is the code responding to the limit switch even though (because it is going in the other direction) it should ignore it. Thank you so much for any suggestions you guys have! I have a motor shield, and I put the wires into digital pins 11 and 13 and one wire in the ground on the digital side and one wire in the ground on the power side. I'm pretty sure I wired the limit switches correctly as well.
(My code was a lot worse before, but I got a lot of help from reddit :P) Serial.println(" Type 1 to move the cube into position and type 2 to move the cube out of position.") here is where the stepper motor code goes (I drew a picture because that description wasn't too great) #define switchA 13 As soon as the limit switch is open again, the motor will run fine. When one of the limit switches is pressed and the user tells the motor to run in the opposite direction to move the cube away, the motor vibrates and doesn't run well. Both limit switches work and will stop the motor when they are pressed, but I ran into a problem. The motor rotates a screw which pushes the prism down the track, and I wired up two limit switches and plan to place them at either end of the track so that the prism stops in the same place every time. My goal is to have a prism be movable along a track remotely. I have been working for a couple of weeks on a project, and I'm at a point where I need some guidance.
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