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#STEPPER MOTOR ADC CONTROLLER CODEVISIONAVR HOW TO#Thanks in advance.In this section, we will see how to connect a stepper motor with Intel 8051 Microcontroller. PS: If you have a M35SP -8 stepper motor and it can run at delays below 7ms then please email me, I would be delighted to know. #STEPPER MOTOR ADC CONTROLLER CODEVISIONAVR SERIAL#Wire up the components according to the schematics, upload the code, open the serial monitor, tune up and down the potentiometer. #STEPPER MOTOR ADC CONTROLLER CODEVISIONAVR CODE#Hence the code has been tuned with few simple IF ELSE statements to make sure the motor runs at a minimum of 8ms at lowest possible ADC resolution and maximum of 60ms delay at highest possible resolution of ADC. On the contrary at the maximum resolution of the ADC which is 1023, the delay between the steps would approximately 1.02 seconds ( 1000ms = 1 second ) resulting the motor to rotate dead slow as it would need approximately 48+ seconds to complete on revolution. There is a limit to which these motors can endure, in my case this rusty 5 yrs.’ old stepper motor cannot respond to a delay lesser than 7 milliseconds, so the minimum possible delay between each steps has to be 8ms or more. If we directly feed this value ranging from 0-1023 as delay in-between each step then, at the lowest possible range ( 0 milliseconds ) the stepper motor would not run at all. An additional line of code to display the value of the current delay in serial monitor is also included, which would display the current delay in which the stepper motor is running ( in Milliseconds ).Īrduino Uno board uses a 8 bit microcontroller and the ADC is 10 Bit ADC, hence the resolution of the output of the ADC would range from 0 – 1023 ( this is general rule no matter which microcontroller you use). By default Arduino has pin 13 interfaced to a tiny onboard led which is configured in the code above to blink if everything goes right. The on-board pin 8,9,10 and 11 are set to output. These pulses are then amplified with a ULN2003 in order to run the M35SP stepper motor. We are literally setting the pins high or low for generating the pulses which would run the stepper motor. The source code here is pretty much self-explanatory, no default Arduino stepper motor library is used here. Serial.println(Spd) // print ADC value of analog readingĭigitalWrite(l1, HIGH) digitalWrite(l2, HIGH) digitalWrite(l3, LOW) digitalWrite(l4, LOW) ĭigitalWrite(l1, LOW) digitalWrite(l2, HIGH) digitalWrite(l3, HIGH) digitalWrite(l4, LOW) ĭigitalWrite(l1, LOW) digitalWrite(l2, LOW) digitalWrite(l3, HIGH) digitalWrite(l4, HIGH) ĭigitalWrite(l1, HIGH) digitalWrite(l2, LOW) digitalWrite(l3, LOW) digitalWrite(l4, HIGH) Int sometempvariable = 0 // Some temp var for adc valĭDRB = B001111 // Setting ddrb register to set pin 8 to 11 as outputĮlse if (sometempvariable <= 170) Int Spd // Variable to set the delay accoding to ADC val Int readADC = A0 //input pin for the potentiometer * File: Stepper Motor Speed Control using ADC - Arduino Number of steps required for one Revolution = 360 / step angle of Stepper motor It has a step angle of 7.5 Degrees, hence the total number of steps it would require for the motor for completing one revolution would be just 360/7.5 = 48 steps approximately. The reason for selecting a M35SP -8 motor is due to its step angle. The coding style I used here is pretty much similar to my other articles on running the same with PIC18F microcontroller family, rather than using the pre coded Arduino stepper motor library. The Stepper motor used here is a rusty old M35SP 8 stepper motor, which is a unipolar stepper. Theoretically ADC convert the analog input to a digital output, we're going to use this concept to control the speed of a running stepper motor. The idea is to throttle up or down the speed of a stepper motor using inbuilt Analog to Digital Converter ( ADC ) of the Arduino UNO. This tutorial is all about tuning the speed of a stepper motor using a potentiometer. Stepper Motor Speed controller using ADC Arduino ![]()
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