2020-06-10 Add driver for dht11

18_dht11/CMakeLists.txt

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+# The following lines of boilerplate have to be in your project's
+# CMakeLists in this exact order for cmake to work correctly
+cmake_minimum_required(VERSION 3.5)
+
+include($ENV{IDF_PATH}/tools/cmake/project.cmake)
+project(app-template)

18_dht11/Makefile

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+#
+# This is a project Makefile. It is assumed the directory this Makefile resides in is a
+# project subdirectory.
+#
+
+PROJECT_NAME := app-template
+
+include $(IDF_PATH)/make/project.mk
+

18_dht11/README.md

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+- esp-idf:
+
+
+wired up:
+=========
+
+```
+DHT11      ESP32
+VCC   ---> VIN
+DATA  ---> D4
+GND   ---> GND
+```
+
+DHT11 with input 3~5.5v
+
+origin dev by samrjohnston
+https://github.com/samrjohnston/ESP32Projects
+
+but his project is full of mistake;
+
+Output:
+=======
+
+SerialPort:with 15200
+
+stdout:
+
+Temperature reading 25
+F temperature is -2
+Humidity reading 77
+
+
+

18_dht11/components/dht11/CMakeLists.txt

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+set(COMPONENT_SRCS "dht11.c")
+set(COMPONENT_ADD_INCLUDEDIRS "include")
+
+register_component()

18_dht11/components/dht11/component.mk

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+#
+# "main" pseudo-component makefile.
+#
+# (Uses default behaviour of compiling all source files in directory, adding 'include' to include path.)
+

18_dht11/components/dht11/dht11.c

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+
+#include "dht11.h"
+
+int temp_x10 = 123;
+int humidity = 60;
+const int channel = 0;
+
+void dht11_init()
+{
+  const int RMT_CLK_DIV = 80;                                   /*!< RMT counter clock divider */
+  const int RMT_TICK_10_US = (80000000 / RMT_CLK_DIV / 100000); /*!< RMT counter value for 10 us.(Source clock is APB clock) */
+  const int rmt_item32_tIMEOUT_US = 1000;                       /*!< RMT receiver timeout value(us) */
+
+  rmt_config_t rmt_rx;
+  rmt_rx.gpio_num = DHT11_GPIO;
+  rmt_rx.channel = channel;
+  rmt_rx.clk_div = RMT_CLK_DIV;
+  rmt_rx.mem_block_num = 1;
+  rmt_rx.rmt_mode = RMT_MODE_RX;
+  rmt_rx.rx_config.filter_en = false;
+  rmt_rx.rx_config.filter_ticks_thresh = 100;
+  rmt_rx.rx_config.idle_threshold = rmt_item32_tIMEOUT_US / 10 * (RMT_TICK_10_US);
+  rmt_config(&rmt_rx);
+  rmt_driver_install(rmt_rx.channel, 1000, 0);
+}
+
+/*********************************************************************************
+ * Processing the pulse data into temp and humidity
+ *********************************************************************************/
+static int parse_items(rmt_item32_t *item, int item_num, int *humidity, int *temp_x10)
+{
+  int i = 0;
+  unsigned rh = 0, temp = 0, checksum = 0;
+
+  ///////////////////////////////
+  // Check we have enough pulses
+  ///////////////////////////////
+  if (item_num < 42)
+    return 0;
+
+  ///////////////////////////////////////
+  // Skip the start of transmission pulse
+  ///////////////////////////////////////
+  item++;
+
+  ///////////////////////////////
+  // Extract the humidity data
+  ///////////////////////////////
+  for (i = 0; i < 16; i++, item++)
+    rh = (rh << 1) + (item->duration1 < 35 ? 0 : 1);
+
+  ///////////////////////////////
+  // Extract the temperature data
+  ///////////////////////////////
+  for (i = 0; i < 16; i++, item++)
+    temp = (temp << 1) + (item->duration1 < 35 ? 0 : 1);
+
+  ///////////////////////////////
+  // Extract the checksum
+  ///////////////////////////////
+  for (i = 0; i < 8; i++, item++)
+    checksum = (checksum << 1) + (item->duration1 < 35 ? 0 : 1);
+
+  ///////////////////////////////
+  // Check the checksum
+  ///////////////////////////////
+  if ((((temp >> 8) + temp + (rh >> 8) + rh) & 0xFF) != checksum)
+  {
+    printf("Checksum failure %4X %4X %2X\n", temp, rh, checksum);
+    return 0;
+  }
+
+  ///////////////////////////////
+  // Store into return values
+  ///////////////////////////////
+  *humidity = rh >> 8;
+  *temp_x10 = (temp >> 8) * 10 + (temp & 0xFF);
+  return 1;
+}
+
+/*********************************************************************************
+ * Use the RMT receiver to get the DHT11 data
+ *********************************************************************************/
+int dht11_start_get(int *temp_x10, int *humidity)
+{
+  RingbufHandle_t rb = NULL;
+  size_t rx_size = 0;
+  rmt_item32_t *item;
+  int rtn = 0;
+
+  //get RMT RX ringbuffer
+  rmt_get_ringbuf_handle(channel, &rb);
+  if (!rb)
+    return 0;
+
+  //////////////////////////////////////////////////
+  // Send the 20ms pulse to kick the DHT11 into life
+  //////////////////////////////////////////////////
+  gpio_set_level(DHT11_GPIO, 1);
+  gpio_set_direction(DHT11_GPIO, GPIO_MODE_OUTPUT);
+  ets_delay_us(1000);
+  gpio_set_level(DHT11_GPIO, 0);
+  ets_delay_us(20000);
+
+  ////////////////////////////////////////////////
+  // Bring rmt_rx_start & rmt_rx_stop into cache
+  ////////////////////////////////////////////////
+  rmt_rx_start(channel, 1);
+  rmt_rx_stop(channel);
+
+  //////////////////////////////////////////////////
+  // Now get the sensor to send the data
+  //////////////////////////////////////////////////
+  gpio_set_level(DHT11_GPIO, 1);
+  gpio_set_direction(DHT11_GPIO, GPIO_MODE_INPUT);
+
+  ////////////////////////////////////////////////
+  // Start the RMT receiver for the data this time
+  ////////////////////////////////////////////////
+  rmt_rx_start(channel, 1);
+
+  /////////////////////////////////////////////////
+  // Pull the data from the ring buffer
+  /////////////////////////////////////////////////
+  item = (rmt_item32_t *)xRingbufferReceive(rb, &rx_size, 2);
+  if (item != NULL)
+  {
+    int n;
+    n = rx_size / 4 - 0;
+    //parse data value from ringbuffer.
+    rtn = parse_items(item, n, humidity, temp_x10);
+    //after parsing the data, return spaces to ringbuffer.
+    vRingbufferReturnItem(rb, (void *)item);
+  }
+  /////////////////////////////////////////////////
+  // Stop the RMT Receiver
+  /////////////////////////////////////////////////
+  rmt_rx_stop(channel);
+
+  return rtn;
+}

18_dht11/components/dht11/include/dht11.h

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+/*
+ * @Author: xuhongv
+ * @Date: 2020-06-06 10:43:04
+ * @LastEditTime: 2020-06-10 10:48:30
+ * @LastEditors: Please set LastEditors
+ * @Description: origin from https://github.com/hamsternz/thingspeak-esp32-dht11
+ * @FilePath: https://github.com/xuhongv
+ */
+
+#ifndef DHT11_H_
+#define DHT11_H_
+
+#include <driver/rmt.h>
+#include <soc/rmt_reg.h>
+#include "driver/gpio.h" 
+
+// 定义的GPIO口
+#define DHT11_GPIO 4
+
+/**
+ * @description: 初始化
+ * @param {type} 
+ * @return: 
+ */
+void dht11_init();
+
+/**
+ * @description: 获取温湿度
+ * @param {type} temperature温度，humidity湿度
+ * @return: 
+ */
+int dht11_start_get(int *temperature, int *humidity);
+
+#endif

18_dht11/main/CMakeLists.txt

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+set(COMPONENT_SRCS "main.c")
+
+register_component()

18_dht11/main/Kconfig.projbuild

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+# put here your custom config value
+menu "Example Configuration"
+config ESP_WIFI_SSID
+    string "WiFi SSID"
+    default "myssid"
+    help
+	SSID (network name) for the example to connect to.
+
+config ESP_WIFI_PASSWORD
+    string "WiFi Password"
+    default "mypassword"
+    help
+	WiFi password (WPA or WPA2) for the example to use.
+endmenu

18_dht11/main/component.mk

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+#
+# Main component makefile.
+#
+# This Makefile can be left empty. By default, it will take the sources in the 
+# src/ directory, compile them and link them into lib(subdirectory_name).a 
+# in the build directory. This behaviour is entirely configurable,
+# please read the ESP-IDF documents if you need to do this.
+#

18_dht11/main/main.c

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+
+#include <string.h>
+#include <openssl/ssl.h>
+
+#include <freertos/FreeRTOS.h>
+#include <freertos/task.h>
+#include <freertos/event_groups.h>
+#include <esp_log.h>
+#include <nvs_flash.h>
+
+#include "dht11.h"
+
+const static char *TAG = "demo_dht11";
+
+/**
+ * @description: 程序入口
+ * @param {type} 
+ * @return: 
+ */
+void app_main(void)
+{
+
+    ESP_ERROR_CHECK(nvs_flash_init());
+    vTaskDelay(1000 / portTICK_PERIOD_MS);
+
+    int temp = 0;
+    int hum = 0;
+
+    //init
+    dht11_init();
+
+    while (1)
+    {
+        if (dht11_start_get(&temp, &hum))
+        {
+            ESP_LOGI(TAG, "[%lld] 温度 %i.%i℃ , 湿度 %i%%", esp_timer_get_time(), temp / 10, temp % 10, hum);
+        }
+        vTaskDelay(3000 / portTICK_PERIOD_MS);
+    }
+}