Help with programming servo and stepper motor at the same time

Projects Programming
1

Hi, I'm new to arduino with very little programming experience, so please excuse horrible programming and bad copy pasting. So, I am working on a project that uses a unipolar stepper motor and a non-continuous servo. Here is what i want to happen in steps...

Step 1- Servo rotates a full 180 degrees in either direction slowly (10 seconds for 180 degrees).

Step 2-stepper motor rotates one step.

Step 3-Servo rotates 180 degrees in the opposite direction of step one.

Step 4- Repeat all steps continuously.

Here is my code:

#include <Servo.h>
class Sweeper
{
Servo servo;
int pos; // current servo position
int increment; // increment to move for each interval
int updateInterval; // interval between updates
unsigned long lastUpdate; // last update of position

public:
Sweeper(int interval)
{
updateInterval = interval;
increment = 1;
}

void Attach(int pin)
{
servo.attach(pin);
}

void Detach()
{
servo.detach();
}

void Update()
{
if((millis() - lastUpdate) > updateInterval) // time to update
{
lastUpdate = millis();
pos += increment;
servo.write(pos);
Serial.println(pos);
if ((pos >= 180) || (pos <= 0)) // end of sweep
{
// reverse direction
increment = -increment;
}
}
}
};
Sweeper sweeper1(250); //inside parenthesis indicates speed, 10 would be about 4 seconds(not exactly)
#include <Stepper.h>
#include <LiquidCrystal.h>
#include <dht11.h>
dht11 DHT; //Note:DHT on behalf of the temperature and humidity sensor
const int stepsPerRevolution = 200;
Stepper myStepper(stepsPerRevolution, 8, 9, 10, 13);
const int dht11_data = 6;
const int sensorPin = 0;
int stepCount = 0;
int temp=0;
int hum=0;
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
long previousMillis = 0;
long interval = 500;
void setup()
{
sweeper1.Attach(A1);
lcd.begin(16,2);
lcd.print(" Welcome to ");
lcd.setCursor(0,1);
lcd.print(" DHT11");
delay(2000);
lcd.clear();
}
void loop()
{
sweeper1.Update();
unsigned long currentMillis = millis();
if(currentMillis - previousMillis > interval) {
previousMillis = currentMillis;
DHT.read(dht11_data);
temp=DHT.temperature * 1.8 + 32;
hum=DHT.humidity;
lcd.clear(); //clear display
lcd.print("Hum=%"); //display "Hum=%"
lcd.print(hum);
lcd.setCursor(10,0) ;
lcd.print("DHT11"); //display "Smraza"
lcd.setCursor(0,1) ; //Display position
lcd.print("Temp="); //display"Temp="
lcd.print(temp);
lcd.write(0xDF); //Display custom characters '°'
lcd.print("F");

}
// read the sensor value:
int sensorReading = 20;
// map it to a range from 0 to 100:
int motorSpeed = map(sensorReading, 0, 1023, 0, 100);
// set the motor speed:
if (motorSpeed > 0) {
myStepper.setSpeed(motorSpeed);
// step 1/100 of a revolution:
myStepper.step(stepsPerRevolution / 100);
}
}

...obviously the timing doesn't match for the steps. But, my main problem is that the servo and motor are rotating slower than they should...(mainly the servo). Whenever, I adjust the speed of one, it affects both motor and servo speed.

Again, I'm new to arduino so please comment easy to understand stuff.

2

By the way, I forgot to say that you can ignore the DHT11, LCD, and potentimeter stuff.

3

try running with just the servo or the stepper motor;
if performance improves, then your problem is probably the power supply for the servo and stepper

note also that changing the servo's commanded position by only one degree / 200ms is slow regardless of any power problems.

5

Alright, I tested the program without the motor. The servo ran much faster and smoother. So, does anybody have any recommendations on how to keep enough power flowing?

7

Please modify your post and use the code button </>

so your code looks like this

and is easy to copy to a text editor. See How to use the Forum Your code is too long for me to study quickly without copying to a text editor.

...R
Stepper Motor Basics
Simple Stepper Code
Several Things at a Time

9

I'd merge them if IE11 would let me. Maybe another Mod can do it.

11

Corporate thing. Not allowed to add software to the machines.

13

Can't plug in non-approved USB anything either, nothing that has memory as it could contain virus, worm, malware, etc. Only keyboard & mouse. Anything else has to come from IT and only used in the corporate machines. Bring in a virus from home and you're in deep trouble.
On the road, I take my own laptop and leave the work machine at work.

14

CrossRoads:
Can't plug in non-approved USB anything either, nothing that has memory as it could contain virus, worm, malware, etc. Only keyboard & mouse. Anything else has to come from IT and only used in the corporate machines. Bring in a virus from home and you're in deep trouble.

Sounds very sensible from a corporate point of view, even if frustrating.

I think if I was the corporation I would put the PCs in welded steel boxes so the staff could not get near anything that could screw them up :slight_smile: (I used to be one of the adventurous users that was a PITA for support - especially as I was very friendly with the head of support)

Of course that does nothing to prevent time-wasting on mobile phones (speaking as an irritated customer).

...R

15

so the staff could not get near anything that could screw them up

Like the internet?

16

PaulS:
Like the internet?

Especially that :slight_smile:

...R