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/******************************************************************************
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* a PC fan is wired up to a 12V power supply
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* the fan's SENSE (tachiometer) pin connected to pin 2 on the
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* the pins 4 to 13 on the arduino should directly drive an LED (the
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LED on pin 4 is in the centre of the clock face and the LED on pin
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* if a longer hand (and a larger clock face) is desired, pin 4 can be
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used to indirectly drive a transistor which in turn drives several
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LEDs that turn on anf off in unison in the centre of the clock.
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* a button should be attached to pin 3 that grounds it when pressed.
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* A DS1307 remote clock is connected via I2C on analog pins 4 and 5.
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Implementation details:
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* for a schematic, see ../project/propeller-clock.sch.
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* the timing of the drawing of the clock face is recalculated with
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every rotation of the propeller.
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* a PC fan actually sends 2 tachiometer pulses per revolution, so the
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software skips every other one. This means that the clock may
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appear upside-down if started with the propeller in the wrong
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position. You will need to experiment to dicsover the position that
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the propeller must be in when starting the clock.
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* pressing the button cycles between variations of the current
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* pressing and holding the button for a second cycles between display
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modes (e.g., analogue and digital).
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* pressing and holding the button for 5 seconds enters "time set"
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mode. In this mode, the following applies:
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- the field that is being set flashes
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- pressing the button increments the field currently being set
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- pressing and holding the button for a second cycles through the
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fields that can be set
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- pressing and holding the button for 5 seconds sets the time and
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For a schematic, see propeller-clock.sch.
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- a PC fan is wired up to the 12V supply.
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- the fan's SENSE (tachiometer) pin is connected to pin 2 on the
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- the pins 4 to 13 on the arduino should directly drive an LED (the
36
LED on pin 4 is in the centre of the clock face and the LED on pin
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- if a longer hand (and a larger clock face) is desired, pin 4 can
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be used to indirectly drive (via a MOSFET) multiple LEDs which
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turn on and off in unison in the centre of the clock.
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- a button should be attached to pin 3 that grounds it when pressed.
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Implementation details:
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- the timing of the drawing of the clock face is recalculated with
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every rotation of the propeller (for maximum update speed).
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- pressing the button cycles between display modes
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- holding down the button for 2 seconds enters "set time" mode. In
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this mode, the fan must be held still and the LEDs will indicate
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what number is being entered for each time digit. Pressing the
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button increments the current digit. Holding it down moves to the
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next digit (or leaves "set time" mode when there are no more). In
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order, the digits (with accepted values) are: hours-tens (0 to 2),
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hours-ones (0 to 9), minutes-tens (0 to 5), minutes-ones (0 to 9).
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60
******************************************************************************/
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#include <Bounce.h>
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65
//_____________________________________________________________________________
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// turn an led on/off
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void ledOn( int num, bool on )
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if( num < 0 || num > 9 ) return;
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// convert to pin no.
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// pin 4 needs to be inverted (it's driving a PNP)
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// NOTE: PIN 4 TEMPORARILY DISABLED
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// if( num == 4 ) on = true;
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if( num == 4 ) on = !on;
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digitalWrite( num, on? HIGH : LOW );
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// draw a segment for the test display
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void drawNextSegment_test( int segment )
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void drawNextSegment_test( bool reset )
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// keep track of segment
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static unsigned int segment = 0;
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if( reset ) segment = 0;
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// turn on inside and outside LEDs
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digitalWrite( 4, HIGH );
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digitalWrite( 13, HIGH );
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// display segment number in binary across in the inside LEDs,
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// with the LED on pin 12 showing the least-significant bit
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for( int a = 0; a < 9; a++ )
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ledOn( 8 - a, ( segment >> a ) & 1 );
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for( int a = 0; a < 8; a++ )
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digitalWrite( 12 - a, ( ( segment >> a ) & 1 )? HIGH : LOW );
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// draw a segment for the time display
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void drawNextSegment_time( int segment )
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void drawNextSegment_time( bool reset )
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int second = segment / NUM_SECOND_SEGMENTS;
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int second_segment = segment % NUM_SECOND_SEGMENTS;
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static unsigned int second = 0;
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static unsigned int segment = 0;
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// handle display reset
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// what needs to be drawn?
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bool draw_tick = !second_segment && second % 5 == 0;
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bool draw_second = !second_segment && second == time_seconds;
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bool draw_minute = !second_segment && second == time_minutes;
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bool draw_hour = !second_segment && second == time_hours;
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bool draw_tick = !segment && second % 5 == 0;
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bool draw_second = !segment && second == time_seconds;
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bool draw_minute = !segment && second == time_minute;
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bool draw_hour = !segment && second == time_hour;
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ledOn( 8, draw_tick || draw_minute );
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for( int a = 6; a <= 7; a++ )
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ledOn( a, draw_minute || draw_second );
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for( int a = 0; a <= 5; a++ )
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ledOn( a, draw_minute || draw_second || draw_hour );
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digitalWrite( 13, HIGH );
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digitalWrite( 12, draw_tick || draw_minute );
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for( int a = 10; a <= 11; a++ )
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digitalWrite( a, draw_minute || draw_second );
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for( int a = 4; a <= 9; a++ )
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digitalWrite( 10, draw_minute | draw_second || draw_hour );
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if( ++segment >= NUM_SECOND_SEGMENTS ) {