Arduino - Tataylino.com

Digital clock with ESP32 RTC and LED Matrix

This is another ESP32 with RTC and LED matrix project. This time I have put a ping pong visualization just for fun.

Digital clock ESP32 with RTC and LED matrix

Here’s another project using ESP32 with RTC and LED Video wall module. It is basically same with the last project with analog clock

Power sequencer using arduino nano

A power sequencer is useful for audio systems where you can power up each equipment one at a time in sequence. This will prevent pop sound on the speaker during powering up or down. Basically the power sequence is from input to output when powering up and output to input when powering down.\

64×64 RGB matrix half screen issue

I recently got to work with 64×64 RGB matrix and got into some issue. For some reason it only displays half of the screen. After some research, I figured it is just a simple problem.

High Voltage AC detector for Arduino

Currently I am working with a automatic transfer switch for solar power and I needed something to detect if there is an AC voltage output of the power inverter and the Distribution utility.

TDA7419 Project (Bluetooth + spectrum analyzer + bass mid treble volume control)

Here is a simple circuit that have 7 band spectrum analyzer, bass mid treble and volume controls and input selector. This TDA7419 project is intended for bluetooth speaker project.

TDA7419 project – spectrum analyzer, bass mid treble, volume, input selector

PMOS driver for arduino

In case you are looking to make a Buck controller based on arduino, this is a simple circuit to drive the PMOS transistor mainly for buck circuit applications.

This circuit is simple and only consist of NPN and 1 PNP transistor. The circuit above is part of my MPPT solar charger circuit.

Arduino controlled bass mid treble and input selector with tda7419

If you are looking to control your audio with arduino, here’s it is. It uses TDA7419 chip which has a lot of features for controlling your audio. It has 4 input selector, bass control, mid control, treble control, loudness control and a built-in 7 band spectrum analyzer.

Adafruit oled library problem Workaround

My latest project includes an OLED display with 128×64 resolution and 1.3inch size. In search for a library, I found Adafruit oled libray problem. The display does not seem to work with this library. Upon doing some research, I gave up and do this work around instead.

Arduino Clock with 16×2 LCD and Rotary Encoder without RTC

Here a simple arduino code for clock function without using RTC. If you only want to display the time and not the date, you do not need an RTC. The built-in crystal oscillator of the arduino is accurate enough for time displaying function.

Schematic Diagram

This is simple to build.

Code

[code lang=”c”]
// 1602 clock by tataylino.com
#include <LiquidCrystal.h>

LiquidCrystal lcd(7, 6, 5, 4, 3, 2);
int x = 0;
int minute = 1;
int hour = 12;
int sec = 0;
int am = 0; //1 = morning
bool up = false;
bool down = false;
bool display_update = true;
bool amtopm = false;

int backled = 9;
int button = 13;
int val = 0;
int aState;
int aLastState;

void setup() {
pinMode(button, INPUT);
pinMode(A2, INPUT);
pinMode(A3, INPUT);
// pinMode(13, OUTPUT);
pinMode(backled, OUTPUT);
analogWrite(backled, 255);
// set up the LCD’s number of columns and rows:
lcd.begin(16, 2);
lcd.setCursor(0, 0);
lcd.print(“Orasan”);

//set timer1 interrupt at 1Hz
TCCR1A = 0;// set entire TCCR1A register to 0
TCCR1B = 0;// same for TCCR1B
TCNT1 = 0;//initialize counter value to 0
// set compare match register for 1hz increments
OCR1A = 15624;// = (16*10^6) / (1*1024) – 1 (must be <65536)
// turn on CTC mode
TCCR1B |= (1 << WGM12);
// Set CS10 and CS12 bits for 1024 prescaler
TCCR1B |= (1 << CS12) | (1 << CS10);
// enable timer compare interrupt
TIMSK1 |= (1 << OCIE1A);
sei();//allow interrupts
}
void display() {
if(hour >= 10) {
lcd.setCursor(0, 2);
lcd.print(hour);
} else {
lcd.setCursor(0, 2);
lcd.print(“0”);
lcd.setCursor(1, 2);
lcd.print(hour);
}

lcd.setCursor(2, 2);
lcd.print(“:”);

if(minute >= 10) {
lcd.setCursor(3, 2);
lcd.print(minute);
} else {
lcd.setCursor(3, 2);
lcd.print(“0”);
lcd.setCursor(4, 2);
lcd.print(minute);
}

lcd.setCursor(5, 2);
lcd.print(“:”);
if(sec >= 10){
lcd.setCursor(6, 2);
lcd.print(sec);
} else {
lcd.setCursor(6, 2);
lcd.print(“0”);
lcd.setCursor(7, 2);
lcd.print(sec);
}
if(am == 1){
lcd.setCursor(8, 2);
lcd.print(“am”);
} else {
lcd.setCursor(8, 2);
lcd.print(“pm”);
}
}

void counting_time(){
if(minute < 0 ) {
minute = 59;
hour–;
}
if(hour < 1){ hour = 12; } if (sec >= 60) {
sec = 0;
minute++;
}
if (minute >= 60) {
hour++;
minute = 0;
}
if (hour >=13) {
hour = 1;
}
if(hour == 12 && minute == 0) { // to make sure only 1 am to pm transition
if(amtopm == true) {
amtopm = false;
if(am == 1){
am = 0;
} else {
am = 1;
}
}
}else{
amtopm = true;
}
}

ISR(TIMER1_COMPA_vect){//timer1 interrupt 1Hz
sec++;
counting_time();
if(display_update) {
display();
}
}

void loop() {
val = digitalRead(button); // read button
if (val == HIGH) {
//lcd.setCursor(0, 0);
//lcd.print(“o”);
//minute++;
//delay(500);
}
aState = digitalRead(A3);
if (aState != aLastState){
// If the outputB state is different to the outputA state, that means the encoder is rotating clockwise
if (digitalRead(A2) != aState) {
display_update = false;
minute ++;
counting_time();
if(minute >= 10) {
lcd.setCursor(3, 2);
lcd.print(minute);
} else {
lcd.setCursor(3, 2);
lcd.print(“0”);
lcd.setCursor(4, 2);
lcd.print(minute);
}
display_update = true;
} else {
display_update = false;
minute –;
counting_time();
if(minute >= 10) {
lcd.setCursor(3, 2);
lcd.print(minute);
} else {
lcd.setCursor(3, 2);
lcd.print(“0”);
lcd.setCursor(4, 2);
lcd.print(minute);
}
display_update = true;
}
}
aLastState = aState; //
}

[/code]