NASA might get a fancy digital-count display and retire the analog clock from the Apollo era, but the passion for the analog clock does not end. An analog clock has moving hands, where the smaller one is the hour's hand and travels 30° in one hour, and the longer one is the minute's hand and travels 360° in an hour. The second's hand rotates with a step of 6°. Here we look to design an analog clock using MATLAB.
If you have an analog watch, it tells the time with hands that sweep around a dial: the position of the hands is a measurement of the time. How much the hands move is directly related to what time it is. So if the hour hand sweeps across two segments of the dial, it's showing that twice as much time has elapsed compared to if it had moved only one segment. The point is that the hand's movements over the dial are a way of representing passing time. It's not the same thing as time itself: it's a representation or an analogy of time.
Just because digital technology has advantages, that doesn't mean it's always better than analog. An analog watch might be far more accurate than a digital one if it uses a high-precision movement (gears and springs) to measure time passing. If it has a sweeping second hand, it represents the time more precisely than a digital watch whose display shows only hours and minutes. Surprisingly, analog watches can also keep time better than quartz ones.
Generally, the most expensive watches in the world are analog ones (of course, that's partly because people prefer the way they look), though the world's most accurate atomic clocks show time with digital displays.
The code developed using MATLAB version R2019a. MATLAB has a good collection of graphics commands for plotting and analyzing complex signals. The built-in functions reduce the size of the program and provide the desired output.
% Topic : Designing Analog Clock using MATLAB
% Company: MATLAB Helper
% Website: https://matlabhelper.com
% Date : 12-05-2020
% With the help of this script we will design an analog clock
% NOTE: CLOCK STARTS AND IS MAINTAINED ACCORDING TO TIME INDICATED BY THE INBUILT COMMAND "clock"
% IMPORTANT NOTE: USE s IN COMMAND LINE TO END THE PROGRAM or Stop the clock
%% Clearing the command window and workspace and close all other tabs
%% To create a display of the clock (outer circle)
% Creating a circle of radius 10 with centre (0,0)
% angle assigning theta = 0:2*pi i.e. creating a vector theta from 0 to 2*pi
theta = 0:pi/60:2*pi;
% visualization creating and plotting a circle or display for the clock
xc = r * cos(theta);
yc = r * sin(theta);
h = plot(xc,yc,'r','linewidth',4);
%% To create an analog display for the clock
% plotting the no. 1 to 12 in the clock every 30 degree apart
for theta = pi/6: pi/6: 2*pi
y1 = r * cos(theta);
x1 = r * sin(theta);
% plotting the lines for 1 to 12
plot([x1/9*8 x1/9*7],[y1/9*8 y1/9*7],'color',[0 0 1])
%num2str converts no. to string to write numbers 1 to 12 in the plot
text(x1/9*9.5,y1/9*9.5,num2str(i),'color',[0 0 1]);
for theta=pi/30 : pi/30 : 2*pi
y1 = 10 * cos(theta);
x1 = 10 * sin(theta);
% plotting the lines for 1 to 12
plot([x1/9*8 x1/9*7],[y1/9*8 y1/9*7],'color',[0 0 0])
%% Getting the time from the system
% clock returns the 6 element vector containing date and time
c = clock;
% 4:6 for hour, min,sec
c = c(1,4:6);
minute =c(1,2); sec=c(1,3);
% 24hrs time format, if hr >12 so hr-12
hr = c(1,1)-12;
hr = c(1,1);
min1 = ceil(minute/12);
% Angle of the hour hand
theta = (hr*pi)/6 + (min1*pi)/30;
f=figure(1); hold on;
% Ploting the hour hand
y1 = 3 * cos(theta); Yhr = [0 y1];
x1 = 3 * sin(theta); Xhr = [0 x1];
% Angle sustained by the minute hand
theta1 = (minute*pi)/30;
% Ploting the minute hand
y2 = 4.5 * cos(theta1); Ymin = [0 y2];
x2 = 4.5 * sin(theta1); Xmin = [0 x2];
% Angle sustained by the second hand
theta2 = (sec*pi)/30;
% Ploting the second hand
y3 = 5 * cos(theta2); Ysec = [0 y3];
x3 = 5 * sin(theta2); Xsec = [0 x3];
% tic and toc is used in order to get the processing time of loop
% Viewing or pausing the screen for 'x' second
% delete all the current figures.
s = figure(1);
isKeyPressed = ~isempty(get(s,'CurrentCharacter'));
close figure 1;
A circle with a radius of 10 units is drawn or plotted. Hours are marked from 1 to 12, 30° apart. First, the numbers are converted to string format by using an inbuilt function in MATLAB, i.e. ‘num2str’ and then by using inbuilt ‘text’ function in MATLAB 1 to 12 is written as text in the plot. System time such as your PC’s is read by the command ‘clock’ which is an inbuilt function in MATLAB. According to the current time of your PC, the hours, minutes, and seconds hands are displayed. As the clock function returns time in 24-hour format, the first step is to convert time to 12-hour format.
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