So I am using a Step Motor 28BYJ-48 and while turning the LEDS will light up. Now the problem that I'm having is, that the LED labeled D won't turn off.
My ESP is going into deepsleep to save battery and to improve that, it would be really nice if the LED would be off too.
I am using the CheapStepper library.
When I manually restart the ESP, all LED's are off.
Maybe I have to end the Cheapstepper class or something?
Thanks in advance!
The leds indicate the polarity of the stepper phases. The only way to turn off all leds is to turn off the motor.
CheapStepper library provides a function for this. void CheapStepper::off()
Related
I have a GSM shield V2 for Arduino, and I want some buzzer to make some noise when there is an incoming call. At this link http://www.thaieasyelec.net/archives/Manual/M10_HD_V1.00.pdf page 44 I found that by connecting a simple transistor and a buzzer to the actual "buzzer" pin I should be able to produce sound. I tried and that does not work as expected, all I get is noise from the GND of the shield, that typical GSM noise that everyone know of.
I also tried to connect another arduino as to analog read the buzzer signal, but I get nothing that look like a ringing tone.
Has anyone any idea? Did I forget to setup some things software wise? So far it seems that the buzzer behaviour is completely unrelated to anything code wise, there is just that "buzzer" pin, and that's it, nothing more to set up.
Any help would be much appreciated !
Cheers
Here's a great beeper/alarm part I've used in a couple of recent projects. It is loud but can be muffled. It's self-driving, so all you have to do it supply it enough current at its rated voltage, like through a transistor or Darlington. It has a wide voltage range, and runs great from 3.3V up to 20, So it's ideal for microcontroller projects at 3.3V or 5V. No need to fiddle with timers or PWM to make it beep. Try out this great part.. Drive it from any output pin to a small-signal transistor with a beta of 50 or better and you'll be good to go. Turn output pin on, it starts. Turn output pin off, it stops. I made mine "chirp" like the alarm on a car security system. Easiest thing in the world.
I am using an arduino uno and I am trying to control a motor with two inputs which I found in a small car I used to have as a child.
I connected the first pin of the motor to the arduino ground and the second one to the VCC and the motor started turning.
However, when I write the following code the motor doesn't work.
void setup() {
pinMode(8,OUTPUT);
digitalWrite(8,HIGH);
}
void loop() {
}
(I have connected the first pin of the motor to the ground and the second one to pin 8 of arduino).
Does anybody know why that happens?
You can only get a certain amount of current from an Arduino output pin. In general, you can light an LED with a direct connection to an output pin, but motors require more current. A detailed discussion is here.
To control a device such as a motor which needs more current than the output pin can provide directly, you can use an external transistor. You can buy circuits that implement this idea, such as this Motor Shield for Arduino.
This is not how Arduino is supposed to work with power consuming stuff (like mhopeng said, you may use LED in such a scheme, but not something more consuming): a motor should be between GND and 5V and if you want to control it, you have to use a transistor connected to an output pin.
I had a similar question once, it may be of help, too. Also, it may be a good idea to ask further questions at arduino.SE.
I'm programming the back lights for a toy car using Arduino. What happens is that if I initiate something like the brake (which turns on all the LEDs), all the LEDs turn on right away but don't turn off right away. When I remove the signal from the LEDs, it takes maybe 5 seconds for the LEDs to actually turn off. Basically there is some kind of a lag or delay. Is there a fix for this?
If you have a serial.write/read then that can cause delays. So perhaps that's one reason. A second reason is, it takes a few moments for the power to drain out of the LED (more likely reason). Is there a some component connected between the ground pin of the LED to the ground rail? Try connecting the negative pin of the LED directly to the ground. That should fix it.
Hi im new to Arduino Uno
My question is how to turn a stepper motor 90 dgree clockwise only when the infrared censored a something and turn anti-clockwise when the second infrared censored something is pressed again?
Stepper motor
Infrared transmitter/receiver pair
your help will be much appreciated
Thanks
Software and hardware my friend, software and hardware.
First, you'll need to connect your sensors to the Arduino and make sure you can read them reliably. You can write a sketch that outputs the values to the serial port and monitor them on your computer.
Second, you'll need to connect your motor. A stepper motor is going to need a driver, such as the "Adafruit Motor/Stepper/Servo Shield for Arduino v2 Kit" (link). This kit has sample code you can use to figure out how to drive the motor.
Then you'd connect these two independent pieces together. Write logic that puts the motor in one position when your sensor is sensing, and another when it's not, or use your second sensor to make the second motion.
Note: Stepper motors and the drivers are expensive and maybe not what you really want. For one thing, they use relative motion, not absolute position. If they miss steps (due to hitting something or being manually moved) then they remain in the wrong position until you fix them.
A cheaper and perhaps better solution is to use a hobby servo. They are cheap and use absolute positioning, which means that when you tell them to go somewhere they will always try to get to that position. Also, you can drive them directly from the Arduino without a driver board. One of the built-in Arduino sketches shows how to run them.
Im a PIC fan. I have not used arduino. but I have got a problems when Im going to control servos with pic.
1) when PIc is controlling the servo it cannot do enything else. so during that period it cannot get the sensor readings.
2) after driving the servo to a certain position and now when the pic is doing something else, the pic does not further more generate the pwm signal in the servo connected pin. so the servo may rotate back due to the load.
now my first question is will arduino genarate the pulse continously in the attached pin after the codes
servo s;
s.attach(13);
s.write(120);
or are there eny librarys to control multi servos using PIC in mikroc to avoid the above mentioned problems.
or is it better to use two PICs one to drive servos only and the other for processing and sensor reading, and connect them using I2C.
please I need help from an expert. please reply. thank you...
Yes the Arduino is able to generate the pwm continuously.
Arduino langage is C/C++ with some build in features like analogWrite()for pwm, which make it really easy to program.
Regarding your "when something is running, it can't do anything else" problem, that's one of the major limitation of the Arduino platform as is. You can overcome those limitations by using ISR (Interrupt Service Routine), timers and hardware interrupts.
If you're comfortable with C/C++, you can also use a Real Time Operating System (RTOS) which lets you run think like a regular operating system would: allow cpu time to each task so fast that they seem to run in parallel. But that's not as easy to use as the basic Arduino features, so think carefully if you really need those functions (scheduler, "multi-task", round rubin, etc.)
Hope it helps!
I am planning a similar project, using a PIC16F872, to control a servo motor. I am thinking of using a 32 kHz crystal to have a PWM suitable, of 35Hz and pulse width centred on 1.05 mS. In my case I will first be doing A/D measurements; then when required running the motor. The motor will have a continuous signal until a 'stop' switch gives an interrupt to the PIC.
I should mention that I have modified the servo for continuous running by disconnecting the feedback pot.