Stepper - Display problem

[JanisZvirgzdins]

Hello,

I have built this beauty, but there is a problem. It works just fine, but only the first time I start the instrument. When I turn it off, and try to turn it on again, nothing happens. I supose it is because of some interference between LED displays and stepper motor, because if i try to test each part seperately, everything is ok, I can turn them on and off as many times I want. Displays I'm using are TM1637, stepper 28BYJ-48 with UL2003 driver board. Have also attached external power to Arduino 12V, it helped to remove LED display blinking, while stepper motor is working. So...any ideas?

Thanks,
Janis

Here is the code, I have written.

AA Chrono APVIENOJUMS - .siff

(9.37 KiB) Downloaded 39 times

[jph]

Hi, not enough information. Please include schematics and all details of how you calibrate at switch on. Also include the power supply rails and source.
thanks
Joe

[JanisZvirgzdins]

...well, the power to Led displays and stepper motor control board comes straight from Arduino mega board, they are connected in parallel to +5V and GND pin.

Calibration is done with optical sensor, here is the code:

Code: Select all

local calibrated = false
NEEDLE = hw_stepper_motor_add("CHRONO", "4WIRE_4STEP", 2048, 30)

hw_stepper_motor_position(NEEDLE, nil, "ENDLESS_CLOCKWISE")

function hall_sensor(position)
  if position == 0 and not calibrated then
    hw_stepper_motor_calibrate(NEEDLE, 0.0)
    hw_stepper_motor_position(NEEDLE, 0.0)
    calibrated = true
  end             
end

timer_start(10000, function ()
  function chronometer(data)
    if calibrated then -- Optional extra check, you can leave this one out if 10 seconds is always enough
      hw_stepper_motor_position(NEEDLE, 1/60 * data)
    end
  end
  xpl_dataref_subscribe("laminar/B738/clock/captain/chrono_seconds_needle", "FLOAT", chronometer)
end)

hw_switch_add("SENSOR ", 1, hall_sensor)

But as I said before, the motor and calibration, when done seperately from LED displays, is working ok. And displays, without motor also works ok. So, I think, the problem is when they come together. On first startup everything works just normal, but after I turn it of an try to turn again, arduino or air manager seems to freeze, until I restart Air Manager, or replug Arduino USB cable.

[SimPassion]

chrono.jpg

Hello,

I have built this beauty, but there is a problem. It works just fine, but only the first time I start the instrument. When I turn it off, and try to turn it on again, nothing happens. I supose it is because of some interference between LED displays and stepper motor, because if i try to test each part seperately, everything is ok, I can turn them on and off as many times I want. Displays I'm using are TM1637, stepper 28BYJ-48 with UL2003 driver board. Have also attached external power to Arduino 12V, it helped to remove LED display blinking, while stepper motor is working. So...any ideas?

Thanks,
Janis

Here is the code, I have written.

AA Chrono APVIENOJUMS - .siff

Very nice design in any case

[Keith Baxter]

...well, the power to Led displays and stepper motor control board comes straight from Arduino mega board, they are connected in parallel to +5V and GND pin.

Hi,

Here is your problem. The arduino cannot handle a display and servo,

Connect a external 5v power supply to the servo and display. Only the Gnd needs to be common .
.

Keith

[JanisZvirgzdins]

...well, i conected seperated power suply for displays and one more for stepper motor, connected to common ground, but the problem remains the same. It works for the first time, but after turning instrument off, it does not turn on again

[SimPassion]

...well, i conected seperated power suply for displays and one more for stepper motor, connected to common ground, but the problem remains the same. It works for the first time, but after turning instrument off, it does not turn on again

Indeed both power supply ground should be common to the Arduino board GND !?

[JanisZvirgzdins]

Yes, to the ground of Arduino, and both displays and motor driver board.

[Keith Baxter]

it does not turn on again

Hi,

What does not turn on again?

The displays or the servo of both.

Keith

[JanisZvirgzdins]

Both do not turn on again, and also buttons does not work.