Table of Contents
- Project Introduction
- Getting Started
- Controlling a Servo
- Controlling a Robot Arm
- Sorting Objects with the 3D Magnetic Sensor 2Go TLE493D
**********************************************************************************************************************
Controlling a Robot Arm
In this chapter I'm going to show how to program a robot arm with the PSoC 62S2 WiFi BT Pioneer Board. I use the previous chapter as a reference, only here I have to control six servos to successfully move my robot arm, in the figure below I show you the electrical diagram used in this chapter.
In the figure below I show you the electrical connection of my robot arm. In the figure we can see the PSoC 62S2 WiFi BT Pioneer plate, the six degrees of freedom robot arm, the wooden platform to slide the rubber balls, and the container.
The wooden platform has a length of 27 cm by 5 cm high, here the rubber balls slide since the platform is slightly inclined 1 or two degrees.
Every time I press the user button, the robot arm is activated, then it holds the rubber ball that is on the wooden platform at the end of the road, finally it places the ball inside a container and it's placed in position of low energy. Below I show you the code uploaded to the PSoC 62S2 WiFi BT Pioneer board: controlling_robot_arm.c
// AUTHOR: GUILLERMO PEREZ GUILLEN
#include "cy_pdl.h"
#include "cy_retarget_io.h"
#include "cyhal.h"
#include "cybsp.h"
/* PWM Frequency */
#define PWM_FREQUENCY (50u)
/* PWM Duty-cycle */
#define PWM_DUTY_CYCLE_1 (4.58f) // 30 degrees
#define PWM_DUTY_CYCLE_2 (7.75f) // 90 degrees
#define PWM_DUTY_CYCLE_3 (12.5f) // 0 degrees
#define PWM_DUTY_CYCLE_4 (10.92f) // 150 degrees
#define PWM_DUTY_CYCLE_5 (7.75f) // 90 degrees
#define PWM_DUTY_CYCLE_6 (4.50f) // 30 degrees
/*******************************************************************************
* Function Prototypes
********************************************************************************/
static void gpio_interrupt_handler(void *handler_arg, cyhal_gpio_event_t event);
/*******************************************************************************
* Global Variables
********************************************************************************/
volatile bool gpio_intr_flag = false;
/*******************************************************************************
* Function Name: main
*******************************************************************************/
int main(void)
{
cy_rslt_t result;
uint32_t count = 0;
uint32_t delay_led_blink = DELAY_LONG_MS;
/* PWM object */
cyhal_pwm_t servo_1, servo_2, servo_3, servo_4, servo_5, servo_6;
/* Initialize the device and board peripherals */
result = cybsp_init();
/* Board init failed. Stop program execution */
if (result != CY_RSLT_SUCCESS)
{
CY_ASSERT(0);
}
/* Initialize retarget-io to use the debug UART port */
result = cy_retarget_io_init(CYBSP_DEBUG_UART_TX, CYBSP_DEBUG_UART_RX,
CY_RETARGET_IO_BAUDRATE);
/* Initialize the user LED */
result = cyhal_gpio_init(CYBSP_USER_LED, CYHAL_GPIO_DIR_OUTPUT,
CYHAL_GPIO_DRIVE_STRONG, CYBSP_LED_STATE_OFF);
/* Initialize the user button */
result = cyhal_gpio_init(CYBSP_USER_BTN, CYHAL_GPIO_DIR_INPUT,
CYHAL_GPIO_DRIVE_PULLUP, CYBSP_BTN_OFF);
/* Initialize the PWMs */
result = cyhal_pwm_init(&servo_1, P7_5, NULL);
result = cyhal_pwm_init(&servo_2, P7_6, NULL);
result = cyhal_pwm_init(&servo_3, P12_3, NULL);
result = cyhal_pwm_init(&servo_4, P12_0, NULL);
result = cyhal_pwm_init(&servo_5, P12_1, NULL);
result = cyhal_pwm_init(&servo_6, P12_2, NULL);
/* Configure GPIO interrupt */
cyhal_gpio_register_callback(CYBSP_USER_BTN,
gpio_interrupt_handler, NULL);
cyhal_gpio_enable_event(CYBSP_USER_BTN, CYHAL_GPIO_IRQ_FALL,
GPIO_INTERRUPT_PRIORITY, true);
/* Enable global interrupts */
__enable_irq();
/* \x1b[2J\x1b[;H - ANSI ESC sequence for clear screen */
printf("\x1b[2J\x1b[;H");
printf("**************** PSoC 6 MCU: GPIO Interrupt *****************\r\n");
for (;;)
{
/* Start the PWM */
result = cyhal_pwm_start(&servo_1);
cyhal_system_delay_ms(10);
result = cyhal_pwm_start(&servo_2);
cyhal_system_delay_ms(10);
result = cyhal_pwm_start(&servo_3);
cyhal_system_delay_ms(10);
result = cyhal_pwm_start(&servo_4);
cyhal_system_delay_ms(10);
result = cyhal_pwm_start(&servo_5);
cyhal_system_delay_ms(10);
result = cyhal_pwm_start(&servo_6);
cyhal_system_delay_ms(10);
/* Check the interrupt status */
if (true == gpio_intr_flag)
{
gpio_intr_flag = false;
/* Update LED toggle delay */
if (DELAY_LONG_MS == delay_led_blink)
{
delay_led_blink = DELAY_SHORT_MS;
}
else
{
delay_led_blink = DELAY_LONG_MS;
}
}
/* Blink LED four times */
for (count = 0; count < LED_BLINK_COUNT; count++)
{
cyhal_gpio_write(CYBSP_USER_LED, CYBSP_LED_STATE_ON);
cyhal_system_delay_ms(delay_led_blink);
cyhal_gpio_write(CYBSP_USER_LED, CYBSP_LED_STATE_OFF);
cyhal_system_delay_ms(delay_led_blink);
}
cyhal_system_delay_ms(10);
for (int i = 180; i >= 90; i--){ // servo_3
float PWM_DUTY_CYCLE_C = ((i*9.5)/180)+3;
result = cyhal_pwm_set_duty_cycle(&servo_3, PWM_DUTY_CYCLE_C, PWM_FREQUENCY);
result = cyhal_pwm_start(&servo_3);
cyhal_system_delay_ms(20);
}
cyhal_system_delay_ms(100);
for (int i = 30; i <= 180; i++){ // servo_1 ***
float PWM_DUTY_CYCLE_A = ((i*9.5)/180)+3;
result = cyhal_pwm_set_duty_cycle(&servo_1, PWM_DUTY_CYCLE_A, PWM_FREQUENCY);
result = cyhal_pwm_start(&servo_1);
cyhal_system_delay_ms(20);
}
cyhal_system_delay_ms(100);
for (int i = 30; i <= 110; i++){ // servo_6
float PWM_DUTY_CYCLE_F = ((i*9.5)/180)+3;
result = cyhal_pwm_set_duty_cycle(&servo_6, PWM_DUTY_CYCLE_F, PWM_FREQUENCY);
result = cyhal_pwm_start(&servo_6);
cyhal_system_delay_ms(20);
}
cyhal_system_delay_ms(100);
for (int i = 90; i >= 75; i--){ // servo_2
float PWM_DUTY_CYCLE_B = ((i*9.5)/180)+3;
result = cyhal_pwm_set_duty_cycle(&servo_2, PWM_DUTY_CYCLE_B, PWM_FREQUENCY);
result = cyhal_pwm_start(&servo_2);
cyhal_system_delay_ms(20);
}
cyhal_system_delay_ms(100);
for (int i = 90; i <= 120; i++){ // servo_3
float PWM_DUTY_CYCLE_C = ((i*9.5)/180)+3;
result = cyhal_pwm_set_duty_cycle(&servo_3, PWM_DUTY_CYCLE_C, PWM_FREQUENCY);
result = cyhal_pwm_start(&servo_3);
cyhal_system_delay_ms(20);
}
cyhal_system_delay_ms(100);
for (int i = 110; i >= 60; i--){ // servo_6
float PWM_DUTY_CYCLE_F = ((i*9.5)/180)+3;
result = cyhal_pwm_set_duty_cycle(&servo_6, PWM_DUTY_CYCLE_F, PWM_FREQUENCY);
result = cyhal_pwm_start(&servo_6);
cyhal_system_delay_ms(20);
}
cyhal_system_delay_ms(100);
for (int i = 150; i >= 90; i--){ // servo_4
float PWM_DUTY_CYCLE_D = ((i*9.5)/180)+3;
result = cyhal_pwm_set_duty_cycle(&servo_4, PWM_DUTY_CYCLE_D, PWM_FREQUENCY);
result = cyhal_pwm_start(&servo_4);
cyhal_system_delay_ms(20);
}
cyhal_system_delay_ms(100);
for (int i = 180; i >= 90; i--){ // servo_1 ***
float PWM_DUTY_CYCLE_A = ((i*9.5)/180)+3;
result = cyhal_pwm_set_duty_cycle(&servo_1, PWM_DUTY_CYCLE_A, PWM_FREQUENCY);
result = cyhal_pwm_start(&servo_1);
cyhal_system_delay_ms(20);
}
cyhal_system_delay_ms(100);
for (int i = 60; i <= 110; i++){ // servo_6
float PWM_DUTY_CYCLE_F = ((i*9.5)/180)+3;
result = cyhal_pwm_set_duty_cycle(&servo_6, PWM_DUTY_CYCLE_F, PWM_FREQUENCY);
result = cyhal_pwm_start(&servo_6);
cyhal_system_delay_ms(20);
}
cyhal_system_delay_ms(100);
for (int i = 90; i >= 60; i--){ // servo_1 ***
float PWM_DUTY_CYCLE_A = ((i*9.5)/180)+3;
result = cyhal_pwm_set_duty_cycle(&servo_1, PWM_DUTY_CYCLE_A, PWM_FREQUENCY);
result = cyhal_pwm_start(&servo_1);
cyhal_system_delay_ms(20);
}
cyhal_system_delay_ms(100);
for (int i = 120; i <= 150; i++){ // servo_4
float PWM_DUTY_CYCLE_D = ((i*9.5)/180)+3;
result = cyhal_pwm_set_duty_cycle(&servo_4, PWM_DUTY_CYCLE_D, PWM_FREQUENCY);
result = cyhal_pwm_start(&servo_4);
cyhal_system_delay_ms(20);
}
cyhal_system_delay_ms(100);
for (int i = 120; i >= 90; i--){ // servo_3
float PWM_DUTY_CYCLE_C = ((i*9.5)/180)+3;
result = cyhal_pwm_set_duty_cycle(&servo_3, PWM_DUTY_CYCLE_C, PWM_FREQUENCY);
result = cyhal_pwm_start(&servo_3);
cyhal_system_delay_ms(20);
}
cyhal_system_delay_ms(100);
for (int i = 75; i <= 90; i++){ // servo_2
float PWM_DUTY_CYCLE_B = ((i*9.5)/180)+3;
result = cyhal_pwm_set_duty_cycle(&servo_2, PWM_DUTY_CYCLE_B, PWM_FREQUENCY);
result = cyhal_pwm_start(&servo_2);
cyhal_system_delay_ms(20);
}
cyhal_system_delay_ms(100);
for (int i = 110; i >= 30; i--){ // servo_6
float PWM_DUTY_CYCLE_F = ((i*9.5)/180)+3;
result = cyhal_pwm_set_duty_cycle(&servo_6, PWM_DUTY_CYCLE_F, PWM_FREQUENCY);
result = cyhal_pwm_start(&servo_6);
cyhal_system_delay_ms(20);
}
cyhal_system_delay_ms(100);
for (int i = 60; i >= 30; i--){ // servo_1 ***
float PWM_DUTY_CYCLE_A = ((i*9.5)/180)+3;
result = cyhal_pwm_set_duty_cycle(&servo_1, PWM_DUTY_CYCLE_A, PWM_FREQUENCY);
result = cyhal_pwm_start(&servo_1);
cyhal_system_delay_ms(20);
}
cyhal_system_delay_ms(100);
for (int i = 90; i <= 180; i++){ // servo_3
float PWM_DUTY_CYCLE_C = ((i*9.5)/180)+3;
result = cyhal_pwm_set_duty_cycle(&servo_3, PWM_DUTY_CYCLE_C, PWM_FREQUENCY);
result = cyhal_pwm_start(&servo_3);
cyhal_system_delay_ms(20);
}
cyhal_system_delay_ms(10);
result = cyhal_pwm_stop(&servo_1);
result = cyhal_pwm_stop(&servo_2);
result = cyhal_pwm_stop(&servo_3);
result = cyhal_pwm_stop(&servo_4);
result = cyhal_pwm_stop(&servo_5);
result = cyhal_pwm_stop(&servo_6);
cyhal_system_delay_ms(10);
/* Enter deep sleep mode */
cyhal_system_deepsleep();
}
}
/*******************************************************************************
* Function Name: gpio_interrupt_handler
*******************************************************************************/
static void gpio_interrupt_handler(void *handler_arg, cyhal_gpio_irq_event_t event)
{
gpio_intr_flag = true;
}
In the video below I show you a test with the robot arm, and four rubber balls.
Conclusion:
- The work done in chapter 3 of this project helped me to program a robotic arm with six degrees of freedom. The work is done in an automated way.
- I attach the code used in my Github repository: object-classifier-and-counter