1.4 KiB
1.4 KiB
ESP32 GP2Y Dust Sensor
Install
Designed to be used as an esp-idf component
. Suggested usage is with git submodule
git submodule add https://git.oit.cloud/morgan/esp32-gp2y.git components/esp32-gp2y/
git submodule update --init
API
typedef gp2y_cfg_t
float K
Sensitivity. Default: 0.5
float offset_voltage
Voltage level at 0ug/m3 dust. Defaults to 0.6v, dynamically lowers.
int8_t pin_led
Pin to pulse LED on.
adc1_channel_t adc_channel
ADC channel to read on. See IDF Guide to get pin to channel reference.
adc_unit_t adc_unit
ADC unit to read on.
int32_t gp2y_read(gp2y_cfg_t *cfg, uint8_t samples)
Passing a pointer to gp2y_cfg_t
and number of samples to take. 100 is a good starting point.
Example
#include <stdio.h>
#include <unistd.h>
#include "driver/gpio.h"
#include "driver/adc.h"
#include "esp32-gp2y.h"
#define PIN_LED 5
void app_main() {
gp2y_cfg_t gp2y_cfg = GP2Y_DEFAULT_CFG;
gp2y_cfg.adc_channel = channel;
gp2y_cfg.pin_led = PIN_LED;
gpio_config_t io_conf;
io_conf.intr_type = GPIO_INTR_DISABLE;
io_conf.mode = GPIO_MODE_OUTPUT;
io_conf.pin_bit_mask = (1ULL<<gp2y_cfg.pin_led);
io_conf.pull_down_en = 1;
io_conf.pull_up_en = 0;
gpio_config(&io_conf);
adc1_config_channel_atten(gp2y_cfg.adc_channel, ADC_ATTEN_DB_11);
while (1) {
printf("aqi: %dug/m3\n", gp2y_read(&gp2y_cfg, 100));
vTaskDelay(1000 / portTICK_PERIOD_MS);
}
}