BIG, AUTO DIM, นาฬิกาห้อง (ใช้ ARDUINO และ WS2811) (https://www.instructables.com/id/Big-auto-dim-room-clock-using-arduino-and-WS2811/)

Step 1: Prerequisites

3 More Images

Things I used for this project :

Electronics :

Arduino nano V3.0 (sadly since I can't afford an original arduino I used a chinese clone, for showing my support I donated 2.9 $ to arduino) - 2.9$ on ebay
Digital Light Intensity Sensor Module Photo Resistor for Arduino - 0.99$ on ebay
DS3231 AT24C32 IIC Module Precision Real Time Clock Quare Memory for Arduino - 0.99$ on ebay
DC-DC Buck Converter Step Down Module LM2596 Power Output 1.23V-30V - 0.90$ on ebay
4m WS2811 led strip 30 leds/m - 12 $ on aliexpress (1 WS2811 IC control 3 LED Chip)

Total cost of electronics : 17.78 $ (without arduino donation)

Miscellaneous :

Heat Shrink Tubing - 7.99$ ebay (assortment, it total 33m)
20 pcs 5 x 7 cm prototype pcb - 3$ ebay
3 pcs Micro Switch - 1$ locally bought
Solder - 1$ locally bought
Flux - 1$ locally bought
UTP cable (individual wires used for various connections)
LCD font (http://www.dafont.com/lcd-lcd-mono.font) - free
Cardboard - free loacal supermarket
Polystyrene board - 1.50$ locally bought

Various tools.

Step 2: Preparing - Digit Template

download and install LCD font (http://www.dafont.com/lcd-lcd-mono.font
open word or similar editor and make a template similar to the image (first img)
- font size ~800,
- white font color black outline,
- gray boxes where led strip fits
Print and cut the gray strips with a exacto knife (second img)

Step 3: Preparing - Cut Cardboard and Led Strip

Picture of Preparing - Cut Cardboard and Led Strip

Using the digit template cut the cardboard to size (don't forget to leave space for the dots between hours and minutes)

If your LED strips came with connectors at each end (like mine did) desolder the connector and cut them in sets of 3.

Step 4: Stick the LED Strips

Using the template stick the LED strip on the cardboard.

It's not mandatory but I used a pencil to mark where the LED strips should be placed, this way I got to see the final form before attaching the LED's. It was a good thing since this is how I noticed I left two much space for those dots in the middle, as a result I had stuck the LED strips a little closer.

Step 5: Solder LED Strips

Now starts a long soldering session.

Solder the LED strips in order to form a continues strip.

Notice the order in which to solder the strips in the picture.

For the middle dots I used a single LED strip and covered the middle LED with duct tape.

I used the following color code

Blue for ground
Green for data
Red for Vcc (12v)

Step 6: Wire Arduino on Breadbord

I tried doing a sketch in fritzing but I can't find all the parts :( , Sorry

So here is a list with all the connections and another picture with the setup on a breadboard

Step 7: Test LED's

Before loading this sketch (for which I assume no credit) don't forget to add FastLED library.

If everything went OK the LED's should cycle trough colors. If you have any problems first check your soldered points.

Step 8: Program the Clock

After struggling a little I managed to get a working clock that covers all my needs. I'm sure there is room for improvement.

The code is very commented, if you have any questions please feel free to ask. Also if you have any suggestions, please do tell.

All debugging messages are commented as well.

In order to change the color used you must modify the variable at line 22 ( int ledColor = 0x0000FF; // Color used (in hex)). You can find a list of colors at the bottom of this page: https://github.com/FastLED/FastLED/wiki/Pixel-refe...

If you have problems downloading the code file from instructables here is a mirror : http://bit.ly/1Qjtgg0

Step 9: Make Digits Form Using Polystyrene

Picture of Make Digits Form Using Polystyrene

Cut each segment in the template printed at the beginning.
Form each digit in the polystyrene using a exacto knife (very hard) or a Hot Wire Cutter.

You can see how I made mine in the pictures.

If you don't have a guitar string you can use just about any thin STEEL wire.

In order to power the Hot Wire Cutter I used the 12v LED power supply.

Also there is a picture with a cut digit. (sorry I forgot to take pictures in the process).

Step 10: Glue Digits and Adding Diffuser

Picture of Glue Digits and Adding Diffuser

After cutting all 4 digits and the dots glue all of them on the cardboard with the LED strips. (for this process I used
double sided adhesive tape).

In order to diffuse the LED light I used 2 paper sheets on top of the polystyrene. For convenience and aesthetics I used a single A2 size paper folded in two.

Also for finishing touches I've put the entire assembly in a large picture frame.

Second Prize in the
Time Contest

11 People Made This Project!

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176 Discussions

How would you go about adding a third set of digits for seconds. I want to be able to use this as a clock and a timer.

I have no idea what i am doing wrong, I can not get the leds to work, I have tried just a strip of them to test to see if it was the solder, but it doesn't work. Here is the code i am using.
#include <DS3232RTC.h>
#include <Time.h>
#include <Wire.h>
#include "FastLED.h"
#define NUM_LEDS 71 // Number of LED controles (remember I have 3 leds / controler
#define COLOR_ORDER BRG // Define color order for your strip
#define DATA_PIN 6 // Data pin for led comunication
CRGB leds[NUM_LEDS]; // Define LEDs strip
byte digits[10][35] = {{0,0,0,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1}, // Digit 0
{0,0,0,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1}, // Digit 1
{1,1,1,1,1,1,1,1,1,0,0,0,1,1,1,1,1,1,0,0,0,}, // Digit 2
{1,1,1,1,1,1,1,1,1,0,0,0,0,0,0,1,1,1,1,1,1}, // Digit 3
{1,1,1,1,1,1,0,0,0,1,1,1,0,0,0,0,0,0,1,1,1}, // Digit 4
{1,1,1,0,0,0,1,1,1,1,1,1,0,0,0,1,1,1,1,1,1}, // Digit 5
{1,1,1,0,0,0,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1}, // Digit 6
{0,0,0,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,1,1,1}, // Digit 7
{1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1}, // Digit 8
{1,1,1,1,1,1,1,1,1,1,1,1,0,0,0,1,1,1,1,1,1}}; // Digit 9 | 2D Array for numbers on 7 segment
byte firstdigit[2][10] = {{0,0,0,0,0,0}, // Digit 0 first number
{1,1,1,1,1,1}}; // Digit 1 first number | 2D Array for numbers on 7 segment
bool Dot = true; //Dot state
bool DST = false; //DST state
long ledColor = 0xDC143C; // Color used (in hex)
void setup(){
Serial.begin(9600);
Wire.begin();
LEDS.addLeds<WS2812B, DATA_PIN, COLOR_ORDER>(leds, NUM_LEDS); // Set LED strip type
LEDS.setBrightness(255); // Set initial brightness
pinMode(2, INPUT_PULLUP); // Define DST adjust button pin
pinMode(4, INPUT_PULLUP); // Define Minutes adjust button pin
pinMode(5, INPUT_PULLUP); // Define Hours adjust button pin
}
// Check Light sensor and set brightness accordingly
void BrightnessCheck(){
const byte sensorPin = 3; // light sensor pin
const byte brightnessLow = 75; // Low brightness value
const byte brightnessHigh = 100; // High brightness value
int sensorValue = digitalRead(sensorPin); // Read sensor
if (sensorValue == 0) {
Serial.println("Brightness High");
LEDS.setBrightness(brightnessHigh);
}
else {
Serial.println("Brightness Low");
LEDS.setBrightness(brightnessLow);
}
};
// Get time in a single number
int GetTime(){
tmElements_t Now;
RTC.read(Now);
int hour=Now.Hour;
if (DST) { if (hour==24) {hour=1;}
else {hour += 1;}
};
if (hour>12 ){hour -= 12;};
int minutes=Now.Minute;
int second =Now.Second;
if (second % 2==0) {Dot = false;}
else {Dot = true;};
return (hour*100+minutes);
};
void DSTcheck(){
int buttonDST = digitalRead(2);
Serial.print("DST is: ");Serial.println(DST);
if (buttonDST == LOW){
if (DST){
DST=false;
Serial.print("Switching DST to: ");Serial.println(DST);
}
else if (!DST){
DST=true;
Serial.print("Switching DST to: ");Serial.println(DST);
};
delay(500);
};
}
// Convert time to array needet for display
void TimeToArray(){
int Now = GetTime(); // Get time
int cursor = 116;
Serial.print("Time is: ");Serial.println(Now);
if (Dot){leds[45]=ledColor;leds[46]=ledColor;}
else {leds[45]=0x000000;leds[46]=0x000000;};
for(int i=1;i<=4;i++){
int digit = Now % 10; // get last digit in time
if (i==1){
cursor =82;
Serial.print("Digit 4 is : ");Serial.print(digit);Serial.print(", the array is : ");
for(int k=0; k<=34;k++){
Serial.print(digits[digit][k]);
if (digits[digit][k]== 1){leds[cursor]=ledColor;}
else if (digits[digit][k]==0){leds[cursor]=0x000000;};
cursor ++;
};
Serial.println();
}
else if (i==2){
cursor =47;
Serial.print("Digit 3 is : ");Serial.print(digit);Serial.print(", the array is : ");
for(int k=0; k<=34;k++){
Serial.print(digits[digit][k]);
if (digits[digit][k]== 1){leds[cursor]=ledColor;}
else if (digits[digit][k]==0){leds[cursor]=0x000000;};
cursor ++;
};
Serial.println();
}
else if (i==3){
cursor =10;
Serial.print("Digit 2 is : ");Serial.print(digit);Serial.print(", the array is : ");
for(int k=0; k<=34;k++){
Serial.print(digits[digit][k]);
if (digits[digit][k]== 1){leds[cursor]=ledColor;}
else if (digits[digit][k]==0){leds[cursor]=0x000000;};
cursor ++;
};
Serial.println();
}
else if (i==4){
cursor =0;
Serial.print("Digit 1 is : ");Serial.print(digit);Serial.print(", the array is : ");
for(int k=0; k<=9;k++){
Serial.print(firstdigit[digit][k]);
if (firstdigit[digit][k]== 1){leds[cursor]=ledColor;}
else if (firstdigit[digit][k]==0){leds[cursor]=0x000000;};
cursor ++;
};
Serial.println();
};
Now /= 10;
};
};
void TimeAdjust(){
int buttonH = digitalRead(5);
int buttonM = digitalRead(4);
if (buttonH == LOW || buttonM == LOW){
delay(500);
tmElements_t Now;
RTC.read(Now);
int hour=Now.Hour;
int minutes=Now.Minute;
if (buttonH == LOW){
if (Now.Hour== 24){Now.Hour=1;}
else {Now.Hour += 1;};
}else {
if (Now.Minute== 59){Now.Minute=0;}
else {Now.Minute += 1;};
};
RTC.write(Now);
}
}
void loop() // Main loop
{
BrightnessCheck(); // Check brightness
DSTcheck(); // Check DST
TimeAdjust(); // Check to se if time is geting modified
TimeToArray(); // Get leds array with required configuration
FastLED.show(); // Display leds array
}

I Built this clock it work great, except it looses a few seconds every couple of days.
So what i did is added a NodeMCU ESP-12 WIFI module, now my clock pulls time from NTP server so the clock never looses time. And the RTC is still used just encase he Internet goes down. The WIFI module updates the RTC module.

1 reply

It does not load ... Here's the error.
Arduino: 1.8.5 (Windows 10), Плата:"Arduino Nano, ATmega328P"
In file included from C:\FLTK1MPIGJOSU6N\FLTK1MPIGJOSU6N.ino:1:0:
C:\Users\Игорь\Documents\Arduino\libraries\DS3232RTC-master/DS3232RTC.h:136:26: error: 'tmElements_t' has not been declared
static byte read(tmElements_t &tm);
^
C:\Users\Игорь\Documents\Arduino\libraries\DS3232RTC-master/DS3232RTC.h:137:20: error: 'tmElements_t' has not been declared
byte write(tmElements_t &tm);
^
In file included from C:\FLTK1MPIGJOSU6N\FLTK1MPIGJOSU6N.ino:4:0:
C:\Users\Игорь\Documents\Arduino\libraries\FastLED-master/FastLED.h:17:21: note: #pragma message: FastLED version 3.001.005
# pragma message "FastLED version 3.001.005"
^
C:\FLTK1MPIGJOSU6N\FLTK1MPIGJOSU6N.ino: In function 'int GetTime()':
FLTK1MPIGJOSU6N:34: error: 'tmElements_t' was not declared in this scope
tmElements_t Now;
^
FLTK1MPIGJOSU6N:35: error: 'Now' was not declared in this scope
RTC.read(Now);
^
C:\FLTK1MPIGJOSU6N\FLTK1MPIGJOSU6N.ino: In function 'void TimeAdjust()':
FLTK1MPIGJOSU6N:138: error: 'tmElements_t' was not declared in this scope
tmElements_t Now;
^
FLTK1MPIGJOSU6N:139: error: 'Now' was not declared in this scope
RTC.read(Now);
^
exit status 1
'tmElements_t' was not declared in this scope

1 reply

hi, someone can tell me how to add temp display please,
thanks

IS IT POSSIBLE TO USE RTC1302?

1 more answer

Hello everyone,
Can you tell me please, what did you put in front of the leds to create the feelling of a single led/ per segment? What kind of material?
Thanks,
Marius

Excellent project, there is a lot of information to develop it right now I was looking for some project to do it as a college assignment and I think it fits me like a glove.
Regards

I've red in the comments that it is possible to display seconds , can you give me some idea's how to ?

Hi everyone,
I have replicated this project with some additions. Here you will find my code: https://github.com/Barcors/WS2812B_TemperatureCloc...
I have added Dallas sensor for measuring outside temperatures. Positive temperature are working good but I am not success with negative temperatures. Might be someone can help me with this. I do not know how to light up minus and corectly diplay negative temperatures. Thanks

6 replies

Here is the code that makes my clock work. OnlyNoise did this I did very little. At midnight the clock would display 0:00. So I changed it to show 12:00.
#include <DS3232RTC.h>
#include <Time.h>
#include <Wire.h>
#include "FastLED.h"
#define NUM_LEDS 117 // Number of LED controles (remember I have 3 leds / controler
#define COLOR_ORDER GRB // Define color order for your strip
#define DATA_PIN 6 // Data pin for led comunication
CRGB leds[NUM_LEDS]; // Define LEDs strip
byte digits[10][35] = {{0,0,0,0,0,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1}, // Digit 0
{0,0,0,0,0,1,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,1}, // Digit 1
{1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,0,0,0,0,0,1,1,1,1,1,1,1,1,1,1,0,0,0,0,0}, // Digit 2
{1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,0,1,1,1,1,1,1,1,1,1,1}, // Digit 3
{1,1,1,1,1,1,1,1,1,1,0,0,0,0,0,1,1,1,1,1,0,0,0,0,0,0,0,0,0,0,1,1,1,1,1}, // Digit 4
{1,1,1,1,1,0,0,0,0,0,1,1,1,1,1,1,1,1,1,1,0,0,0,0,0,1,1,1,1,1,1,1,1,1,1}, // Digit 5
{1,1,1,1,1,0,0,0,0,0,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1}, // Digit 6
{0,0,0,0,0,1,1,1,1,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,1}, // Digit 7
{1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1}, // Digit 8
{1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,0,0,0,0,0,1,1,1,1,1,1,1,1,1,1}}; // Digit 9 | 2D Array for numbers on 7 segment
byte firstdigit[2][10] = {{0,0,0,0,0,0,0,0,0,0}, // Digit 0 first number
{1,1,1,1,1,1,1,1,1,1}}; // Digit 1 first number | 2D Array for numbers on 7 segment
bool Dot = true; //Dot state
bool DST = false; //DST state
long ledColor = 0x0000ff; // Color used (in hex)
void setup(){
Serial.begin(9600);
Wire.begin();
LEDS.addLeds<WS2811, DATA_PIN, COLOR_ORDER>(leds, NUM_LEDS); // Set LED strip type
LEDS.setBrightness(255); // Set initial brightness
pinMode(2, INPUT_PULLUP); // Define DST adjust button pin
pinMode(4, INPUT_PULLUP); // Define Minutes adjust button pin
pinMode(5, INPUT_PULLUP); // Define Hours adjust button pin
}
// Check Light sensor and set brightness accordingly
void BrightnessCheck(){
const byte sensorPin = 3; // light sensor pin
const byte brightnessLow = 75; // Low brightness value
const byte brightnessHigh = 100; // High brightness value
int sensorValue = digitalRead(sensorPin); // Read sensor
if (sensorValue == 0) {
Serial.println("Brightness High");
LEDS.setBrightness(brightnessHigh);
}
else {
Serial.println("Brightness Low");
LEDS.setBrightness(brightnessLow);
}
};
// Get time in a single number
int GetTime(){
tmElements_t Now;
RTC.read(Now);
int hour=Now.Hour;
if (DST) { if (hour==24) {hour=1;}
else {hour += 1;}
};
if (hour>12 ){hour -= 12;};
int minutes=Now.Minute;
int second =Now.Second;
if (second % 2==0) {Dot = false;}
else {Dot = true;};
return (hour*100+minutes);
};
void DSTcheck(){
int buttonDST = digitalRead(2);
Serial.print("DST is: ");Serial.println(DST);
if (buttonDST == LOW){
if (DST){
DST=false;
Serial.print("Switching DST to: ");Serial.println(DST);
}
else if (!DST){
DST=true;
Serial.print("Switching DST to: ");Serial.println(DST);
};
delay(500);
};
}
// Convert time to array needet for display
void TimeToArray(){
int Now = GetTime(); // Get time
int cursor = 116;
Serial.print("Time is: ");Serial.println(Now);
if (Dot){leds[45]=ledColor;leds[46]=ledColor;}
else {leds[45]=0x000000;leds[46]=0x000000;};
for(int i=1;i<=4;i++){
int digit = Now % 10; // get last digit in time
if (i==1){
cursor =82;
Serial.print("Digit 4 is : ");Serial.print(digit);Serial.print(", the array is : ");
for(int k=0; k<=34;k++){
Serial.print(digits[digit][k]);
if (digits[digit][k]== 1){leds[cursor]=ledColor;}
else if (digits[digit][k]==0){leds[cursor]=0x000000;};
cursor ++;
};
Serial.println();
}
else if (i==2){
cursor =47;
Serial.print("Digit 3 is : ");Serial.print(digit);Serial.print(", the array is : ");
for(int k=0; k<=34;k++){
Serial.print(digits[digit][k]);
if (digits[digit][k]== 1){leds[cursor]=ledColor;}
else if (digits[digit][k]==0){leds[cursor]=0x000000;};
cursor ++;
};
Serial.println();
}
else if (i==3){
cursor =10;
Serial.print("Digit 2 is : ");Serial.print(digit);Serial.print(", the array is : ");
for(int k=0; k<=34;k++){
Serial.print(digits[digit][k]);
if (digits[digit][k]== 1){leds[cursor]=ledColor;}
else if (digits[digit][k]==0){leds[cursor]=0x000000;};
cursor ++;
};
Serial.println();
}
else if (i==4){
cursor =0;
Serial.print("Digit 1 is : ");Serial.print(digit);Serial.print(", the array is : ");
for(int k=0; k<=9;k++){
Serial.print(firstdigit[digit][k]);
if (firstdigit[digit][k]== 1){leds[cursor]=ledColor;}
else if (firstdigit[digit][k]==0){leds[cursor]=0x000000;};
cursor ++;
};
Serial.println();
};
Now /= 10;
};
};
void TimeAdjust(){
int buttonH = digitalRead(5);
int buttonM = digitalRead(4);
if (buttonH == LOW || buttonM == LOW){
delay(500);
tmElements_t Now;
RTC.read(Now);
int hour=Now.Hour;
int minutes=Now.Minute;
if (buttonH == LOW){
if (Now.Hour== 24){Now.Hour=1;}
else {Now.Hour += 1;};
}else {
if (Now.Minute== 59){Now.Minute=0;}
else {Now.Minute += 1;};
};
RTC.write(Now);
}
}
void loop() // Main loop
{
BrightnessCheck(); // Check brightness
DSTcheck(); // Check DST
TimeAdjust(); // Check to se if time is geting modified
TimeToArray(); // Get leds array with required configuration
FastLED.show(); // Display leds array
}

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