ATtiny单片机电子蜡烛
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2023年11月07日 18:43 152
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ATtiny单片机电子蜡烛,ATtiny candle
想想当你好不容易跟女朋友共度烛光晚餐,却因为蜡烛点没了或打翻着火了,那是一件多么坑爹的事啊!今天为你分享一款自己diy的超自然的烛光蜡烛。 ATtiny 电子蜡烛,皮特•米尔斯开发这个伟大的蜡烛,正如我们图片所见到的一样,但怎样让这蜡烛的光芒像传统的蜡烛一样闪烁呢。 皮特使用一个高亮的LED和一些模拟的辅助软件,这样就使得ATtiny 电子蜡烛的烛光和传统蜡烛拥有一样的闪烁的烛光,并且优于传统蜡烛,因为它不伴有明火的危险。 ATtiny 电子蜡烛最难的部分就闪烁神态逼真,所以皮特做了一个蜡烛光检测电阻( LDR )和固定电阻作为一个分压器。这是作为ATTINY85 ADC之中的一个输入端,并离散时间间隔的进行采样。采样速率为100毫秒。然后将采集的8bit的电频值存储到EEPROM中,以便记录蜡烛的闪烁图谱,驱动将其连接的LED、PWM形成通路。在用三节干电池供电。最后您只需编程程序,然后通过开关进行控制。 下面是ATtiny 电子蜡烛的电路图 下面是程序的代码以及写入EEPROM的数据
view plainprint? /* Program Description: This program reads a light detecting resiSTor thru an internal ADC and stores the value, after scaling it, to eeprom. This ADC value is sent to a PWM channel with attached led. This is essentially a data logger for light and replay by LED. If, if you aim the LDR at a flickering candle during its recording phase, you have a flickering led candle. A circuit description and other details can be found at http://petemills.blogspot.com Filename: ATTiny_Candle_v1.0.c Author: Pete Mills Int. RC Osc. 8 MHz; Start-up time PWRDWN/RESET: 6 CK/14 CK + 64 ms */ //********** Includes ********** #include #includeEEPROM的数据 rom.rar#include //********** Definitions ********** // LED for flame simulation #define LED PB0 #define LED_PORT PORTB #define LED_DDR DDRB // Light Detecting Resistor for recording a live flame #define LDR PINB3 #define LDR_PORT PINB #define LDR_DDR DDRB // Tactile Switch Input #define SW1 PINB4 #define SW1_PORT PINB #define SW1_DDR DDRB #define ARRAY_SIZE 500 // size of the flicker array #define SAMPLE_RATE 100 // ms delay for collecting and reproducing the flicker //********** Function Prototypes ********** void setup(void); void toggle_led(void); void program_flicker(void); void led_alert(void); void eeprom_save_array(void); void eeprom_read_array(void); void scale_array(void); uint8_t get_adc(void); uint8_t scale( uint8_t input, uint8_t inp_low, uint8_t inp_hi, uint8_t outp_low, uint8_t outp_hi); uint8_t is_input_low(char port, char channel, uint8_t debounce_time, int input_block); //********** Global Variables ********** uint8_t flicker_array[ ARRAY_SIZE ] = { 0 }; uint8_t EEMEM ee_flicker_array[ ARRAY_SIZE ] = { 0 }; int main(void) { uint16_t replay = 0; setup(); eeprom_read_array(); while(1) { if( is_input_low( SW1_PORT, SW1, 25, 250 ) ) { // program the flicker // after entering and upon completion, a predetermined flash pattern will occur as described in led_alert() // aim the ldr at a flickering candle or any other light source ( like a laser ) you want to record during this time // and upon completion the values are stored to eeprom. They are played back immediately as well // as being recalled from eeprom upon first start up led_alert(); program_flicker(); scale_array(); eeprom_save_array(); led_alert(); } // replay the recorded flicker pattern OCR0A = flicker_array[ replay ]; ++replay; if( replay >= ( ARRAY_SIZE - 13 ) ) // if the end of the stored array has been reached { replay = 0; // start again from the beginning //led_alert(); } _delay_ms( SAMPLE_RATE ); _delay_ms( 3 ); // ADC Conversion time } } //********** Functions ********** void setup(void) { //********* Port Config ********* LED_DDR |= ( 1 << LED); // set PB0 to "1" for output LED_PORT &= ~( 1 << LED ); // turn the led off LDR_DDR &= ~( 1 << LDR ); // set LDR pin to 0 for input LDR_PORT |= ( 1 << LDR ); // write 1 to enable internal pullup SW1_DDR &= ~( 1 << SW1 ); // set sw1 pin to 0 for input SW1_PORT |= ( 1 << SW1 ); // write a 1 to sw1 to enable the internal pullup //********** PWM Config ********* TCCR0A |= ( ( 1 << COM0A1 ) | ( 1 << WGM01 ) | ( 1 << WGM00 ) ); // non inverting fast pwm TCCR0B |= ( 1 << CS00 ); // start the timer //********** ADC Config ********** ADMUX |= ( ( 1 << ADLAR ) | ( 1 << MUX1 ) | ( 1 << MUX0 ) ); // left adjust and select ADC3 ADCSRA |= ( ( 1 << ADEN ) | ( 1 << ADPS2 ) | ( 1 << ADPS1 ) ); // ADC enable and clock divide 8MHz by 64 for 125khz sample rate DIDR0 |= ( 1 << ADC3D ); // disable digital input on analog input channel to conserve power } void toggle_led() { LED_PORT ^= ( 1 << LED ); } uint8_t is_input_low( char port, char channel, uint8_t debounce_time, int input_block ) { /* This function is for debouncing a switch input Debounce time is a blocking interval to wait until the input is tested again. If the input tests low again, a delay equal to input_block is executed and the function returns ( 1 ) */ if ( bit_is_clear( port, channel ) ) { _delay_ms( debounce_time ); if ( bit_is_clear( port, channel ) ) { _delay_ms( input_block ); return 1; } } return 0; } uint8_t get_adc() { ADCSRA |= ( 1 << ADSC ); // start the ADC Conversion while( ADCSRA & ( 1 << ADSC )); // wait for the conversion to be complete return ~ADCH; // return the inverted 8-bit left adjusted adc val } void program_flicker() { // build the flicker array for( int i = 0; i < ARRAY_SIZE; i++ ) { flicker_array[ i ] = get_adc(); _delay_ms( SAMPLE_RATE ); } } void led_alert() { // this is a function to create a visual alert that an event has occured within the program // it toggles the led 10 times. for( int i = 0; i < 10; i++ ) { OCR0A = 0; _delay_ms( 40 ); OCR0A = 255; _delay_ms( 40 ); } } void eeprom_save_array() { for( int i = 0; i < ARRAY_SIZE; i++ ) { eeprom_write_byte( &ee_flicker_array[ i ], flicker_array[ i ] ); } } void eeprom_read_array() { for( int i = 0; i < ARRAY_SIZE; i++ ) { flicker_array[ i ] = eeprom_read_byte( &ee_flicker_array[ i ] ); } } uint8_t scale( uint8_t input, uint8_t inp_low, uint8_t inp_hi, uint8_t outp_low, uint8_t outp_hi) { return ( ( ( input - inp_low ) * ( outp_hi - outp_low ) ) / ( ( inp_hi - inp_low ) + outp_low ) ); } void scale_array() { uint8_t arr_min = 255; uint8_t arr_max = 0; uint8_t out_low = 20; uint8_t out_high = 255; // find the min and max values for( int i = 0; i < ARRAY_SIZE; i++ ) { if( flicker_array[ i ] < arr_min ) arr_min = flicker_array[ i ]; if( flicker_array[ i ] > arr_max ) arr_max = flicker_array[ i ]; } // now that we know the range, scale it for( int i = 0; i < ARRAY_SIZE; i++ ) { flicker_array[ i ] = scale( flicker_array[ i ], arr_min, arr_max, out_low, out_high ); } } igh ); } } igh ); } } } } } } } } } } } } } }
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