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| Both sides previous revisionPrevious revisionNext revision | Previous revision | ||
| en:examples:motor:dc_speed [2012/05/18 08:50] – raivo.sell | en:examples:motor:dc_speed [2020/07/20 09:00] (current) – external edit 127.0.0.1 | ||
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| Line 29: | Line 29: | ||
| P = I × Vq, and if Vq = 0 also P = 0 W | P = I × Vq, and if Vq = 0 also P = 0 W | ||
| - | This means that almost no power is consumed by transistor when it is ON state. Similar situation is also when transistor is closed (OFF state). In this situation | + | This means that almost no power is consumed by transistor when it is ON state. Similar situation is also when transistor is closed (OFF state). In this situation |
| P = I × Vq, and if I = 0 also P = 0 W | P = I × Vq, and if I = 0 also P = 0 W | ||
| - | As a conclusion, when transistor operates only on and off states the efficency | + | As a conclusion, when transistor operates only on and off states the efficiency |
| Line 47: | Line 47: | ||
| <code c> | <code c> | ||
| - | // | ||
| - | // The setup of the pins driving pins. | ||
| - | // | ||
| static pin dcmotor_pins[4][2] = | static pin dcmotor_pins[4][2] = | ||
| { | { | ||
| Line 58: | Line 55: | ||
| }; | }; | ||
| + | static int motorindex[4][2] = | ||
| + | { | ||
| + | { 0, 1 }, | ||
| + | { 2, 3 }, | ||
| + | { 4, 5 }, | ||
| + | { 6, 7 } | ||
| + | }; | ||
| - | // | ||
| // Initialize PWM for specified DC motor. | // Initialize PWM for specified DC motor. | ||
| - | // | ||
| void dcmotor_drive_pwm_init(unsigned char index, timer2_prescale prescaler) | void dcmotor_drive_pwm_init(unsigned char index, timer2_prescale prescaler) | ||
| { | { | ||
| Line 87: | Line 89: | ||
| sei(); | sei(); | ||
| } | } | ||
| - | |||
| void dcmotor_drive_pwm(unsigned char index, signed char direction, unsigned char speed) | void dcmotor_drive_pwm(unsigned char index, signed char direction, unsigned char speed) | ||
| { | { | ||
| - | static int motorindex[4][2] = | ||
| - | { | ||
| - | { 0, 1 }, | ||
| - | { 2, 3 }, | ||
| - | { 4, 5 }, | ||
| - | { 6, 7 } | ||
| - | }; | ||
| - | |||
| if(direction == -1) | if(direction == -1) | ||
| { | { | ||
| - | compbuff[motorindex[index,0]] = 0x00; | + | compbuff[motorindex[index][0]] = 0x00; |
| - | compbuff[motorindex[index,1]] = speed; | + | compbuff[motorindex[index][1]] = speed; |
| } | } | ||
| if(direction == 1) | if(direction == 1) | ||
| { | { | ||
| - | compbuff[motorindex[index,0]] = speed; | + | compbuff[motorindex[index][0]] = speed; |
| - | compbuff[motorindex[index,1]] = 0x00; | + | compbuff[motorindex[index][1]] = 0x00; |
| } | } | ||
| } | } | ||
| Line 120: | Line 113: | ||
| <code c> | <code c> | ||
| - | // | + | |
| - | // Desc.: DC motor speed control | + | |
| - | // Hardware: ATMega2561 Controller board, Motor board with DC motor | + | |
| - | // Author: Raivo Sell, 2012 | + | |
| - | // | + | |
| #include < | #include < | ||
| #include < | #include < | ||
| Line 130: | Line 119: | ||
| int main(void) | int main(void) | ||
| { | { | ||
| - | |||
| // DC motor 0 init with no prescaler | // DC motor 0 init with no prescaler | ||
| dcmotor_drive_pwm_init(0, | dcmotor_drive_pwm_init(0, | ||
| Line 136: | Line 124: | ||
| while(1) | while(1) | ||
| { | { | ||
| - | + | // DC motor drive with half of the nominal speed | |
| - | // DC motor drive with half of the nominal speed | + | |
| dcmotor_drive_pwm(0, | dcmotor_drive_pwm(0, | ||
| } | } | ||
| Line 146: | Line 133: | ||
| <code c> | <code c> | ||
| - | // | ||
| - | // Desc.: DC motor speed control with potentiometer | ||
| - | // Hardware: ATMega2561 Controller board, Motor board with DC motor, Sensor board | ||
| - | // Author: Raivo Sell, 2012 | ||
| - | // | ||
| - | #include < | ||
| + | #include < | ||
| #include < | #include < | ||
| #include < | #include < | ||
| Line 173: | Line 155: | ||
| // DC motor drive with speed from potentiometer | // DC motor drive with speed from potentiometer | ||
| - | // As potentiometer has 10-bit output but DC motor drive function | + | // As potentiometer has 10-bit output but DC motor drive |
| - | // 8-bit input the adc output have to be converted | + | // function |
| - | // e.g dividing the output with 4, or shifting bit 2 position >>2 | + | // to 8-bit e.g dividing the output with 4, or shifting bit |
| + | // 2 position >>2 | ||
| dcmotor_drive_pwm(0, | dcmotor_drive_pwm(0, | ||
| } | } | ||
| } | } | ||
| </ | </ | ||
