#include <stdio.h>
#include <stdint.h>
#include "hardware/pwm.h"
#include "hardware/clocks.h"
#include "pico/stdlib.h"
#include "hardware/gpio.h"
#include "hardware/adc.h"

int main() {
    // declare pin variables
    const unsigned int led_pin = 2, adc_pin=26;

    // Setup PWM on GP3
    gpio_set_function(led_pin, GPIO_FUNC_PWM);
	uint slice_num = pwm_gpio_to_slice_num(led_pin);
    uint chan = pwm_gpio_to_channel(led_pin);
    // enable PWM
    pwm_set_enabled(slice_num,true);
    pwm_set_freq_duty(slice_num,chan,50,0);

    // 12-bit conversion, assume max value == ADC_VREF == 3.3 V
    const float conversion_factor = 100.0f / (1 << 12);
    //declare variables for result
    uint16_t result;
    float resultf;

    adc_init();
    // Make sure GPIO is high-impedance, no pullups etc and select ADC0
    adc_gpio_init(adc_pin);
    adc_select_input(0);
    // Loop forever
    while (1) {
        // read adc value and convert
        result = adc_read();
        resultf = result * conversion_factor;
        pwm_set_duty(slice_num,chan, (int)resultf);
        sleep_ms(500);
    }
}