arthurr/esp-air-monitor
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Started on DS18B20 and PMS5003

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Didn't realise DS18B20 was 1-Wire

Will probably just find a library for that one - can't be arsed
doing more bit banging
This commit is contained in:
Arthur Roberts
2023-11-01 21:12:39 +00:00
parent 8aeade9922
commit 2b117b4b33
8 changed files with 132 additions and 46 deletions
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35
components/dht22/dht22.c
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@@ -1,13 +1,17 @@
#include "dht22.h"
#include "esp_log.h"
#include "hal/gpio_types.h"
#include "sdkconfig.h"
#include "driver/gpio.h"
#include <rom/ets_sys.h>
#include "esp_log.h"
#include "esp_timer.h"
#include "freertos/portmacro.h"
#include "hal/gpio_types.h"
#include "sdkconfig.h"
#include <rom/ets_sys.h>
#ifndef CONFIG_DHT22_DATA_GPIO
#define DATA_GPIO 2
#else
#define DATA_GPIO CONFIG_DHT22_DATA_GPIO
#endif /* CONFIG_DHT22_DATA_GPIO */
#if DATA_GPIO == -1
#error "Please define your DHT22 GPIO Data Pin"
@@ -70,7 +74,8 @@ dht22_error dht22_read() {
gpio_set_direction(DATA_GPIO, GPIO_MODE_INPUT);
// Wait here until it goes high DHT "responds" after being pulled high
// The 40 is pretty arbitrary - but there's probably a problem if it goes higher
// The 40 is pretty arbitrary - but there's probably a problem if it goes
// higher
uint32_t elapsed_time;
elapsed_time = wait_for_signal_to_change_from(1);
if (elapsed_time == DHT22_TIMEOUT_ERROR) {
@@ -105,17 +110,17 @@ dht22_error dht22_read() {
*/
uint8_t data[5] = {0, 0, 0, 0, 0};
for (uint8_t i = 0; i < 40; i++) {
elapsed_time = wait_for_signal_to_change_from(0);
if (elapsed_time == DHT22_TIMEOUT_ERROR || elapsed_time < 30 ||
elapsed_time > 80) {
portENABLE_INTERRUPTS();
return DHT22_TIMEOUT_ERROR;
}
elapsed_time = wait_for_signal_to_change_from(0);
if (elapsed_time == DHT22_TIMEOUT_ERROR || elapsed_time < 30 ||
elapsed_time > 80) {
portENABLE_INTERRUPTS();
return DHT22_TIMEOUT_ERROR;
}
elapsed_time = wait_for_signal_to_change_from(1);
if (elapsed_time > 50) {
data[i / 8] |= (1 << (7 - (i % 8)));
}
elapsed_time = wait_for_signal_to_change_from(1);
if (elapsed_time > 50) {
data[i / 8] |= (1 << (7 - (i % 8)));
}
}
portENABLE_INTERRUPTS();