This is a simple square wave generator, mainly using the Timerone library, allowing you to generate a PWM signal at pin 9.
Hardware components:
Arduino nano r3 × 1
Adafruit Standard LCD-16x2 Blue White × 1
Press button switch, instant × 3
Single Circle Potentiometer -10K ohm × 1
Software applications and online services:
Arduino IDE
This is a simple square wave generator, mainly using the Timerone library, allowing you to generate a PWM signal at pin 9, with a range of about 5Hz to 1 MHz, and can adjust the duty cycle from 0 to 100%.
Be
Schematic:
The equipment is very easy to build, including only a few components:
Arduino nano microcontroller
LCD Monitor
Three pull-up resistors
Three buttons
The pulse generator can adjust the pulse repetition cycle using a button connected to the Arduino number inputs 6 and 7. 13 input pins allow you to adjust duty cycle. The duration and duty cycle reading are displayed in the first row of the LCD 16 × 2 indicator, and the frequency readings are displayed in the second line. The minimum step for adjusting the pulse repetition cycle is 1 μs, so the frequency changes discrete, for example 1 μs, 500 kHz, 3 μs is 333.333 Hz, according to such push, and with the frequency reduction, its adjustment of smoothness increases . This is unrealistic on a higher frequency, but this is the simplified price.
In order to visualize the output signal, I use a small single channel oscilloscope. Finally, install the device in a suitable box, which is another useful tool in the electronic laboratory.
Source code:
#include
#include
Liquidcrystal LCD (12, 11, 5, 4, 3, 2); // RS, E, D4, D5, D6, D7
Unsigned long t = 1000, f, k = 512; // default 1000 μs (1000 Hz), Meander, Pulse Duration Is Equal to Duty Cycle K = 512 (50%)
BYTE K1, KN, KN1, KN2;
INT Drive, Drive0;
Void setup ()
{
LCD.BEGIN (16, 2); // LCD 16x2
PinMode (10, Output);
PinMode (6, Input); // Button At Input 6
PinMode (7, Input); // Button At Input 7
PinMode (13, INPUT); // Button At INPUT 13
}
void loop ()
{
Timer1.initialize (T); // period
Timer1.pwm (9, k); // K - Fill Factor 0-1023. We Remove The Signal from The Output 9
KN = DIGITALREAD (6); // Button Input 6 (- Pulse Period)
KN1 = DIGITALREAD (7); // Button Input 7 (+ Pulse Period)
KN2 = DIGITALREAD (13); // Button Input 13 (+ Circle Fill Factor)
IF (kn == high) {// decreasing the period
DRIVE ++;
IF (drive<30) {
T = T-1;
}
// if the button is help for a long time, the correction of the pulse period x10 x100 x1000 is accelerated
Else IF (drive>30 && drive<60) {
T = T-10;
}
Else IF (drive> = 60 && drive<100) {
T = T-100;
}
Else IF (drive> = 100) {
T = T-1000;
}
}
Else {
DRIVE = 0;
}
IF (kn1 == high) {// adding a period
DRIVE0 ++;
IF (drive0<30) {
T = T + 1;
// if the button is held for a long time, The correction of the period x10 x100 x1000 is accelerated
}
Else IF (drive0>30 && drive0<60) {
T = T + 10;
}
Else IF (drive0> = 60 && drive0<100) {
T = T + 100;
}
Else IF (drive0> = 100) {
T = T + 1000;
}
}
Else {
DRIVE0 = 0;
}
IF (t == 0 || T>300000) {// limited the pulse duration to the minimum, IF 0 μs or more Than 300 ms (3.33 hz), THE PERIOD IS 1 μs
T = 1;
}
IF (T>200000 && T<300000) {// limited The Pulse Duration To The maximum, IF More Than 200 MS, But Less Than 300 MS (3.33 Hz), THE PERIOD IS 200 MS (5 Hz)
T = 200000;
}
F = 1000000 / t; // Calculate the Frequency
K1 = K * 100/1024; // Calculate% Fill Factor
IF (kn2 == high) {// Button for Adjusting The Fill Factor (in a circle from 50 to 100%, Then from 0 to 100%)
K = K + 16; // Step 16 out of 1024 (you can do 8 for smoother adjustment)
}
IF (k == 1024) {
K = 0;
}
// Displaying information on the indeicator
LCD.SetCursor (0, 0);
LCD.Print ("t =");
LCD.Print (T);
LCD.Print ("US");
LCD.SETCURSOR (12,0);
LCD.Print (k1);
LCD.Print ("%");
LCD.SetCursor (0, 1);
LCD.Print ("f =");
LCD.Print (f);
LCD.Print ("HZ");
DELAY (300);
LCD.SetCursor (0, 0);
LCD.Print ("");
LCD.SetCursor (0, 1);
LCD.Print ("");
}
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