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examples/sht3x/sht3x_callback_two_sensors/Makefile

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+PROGRAM=SHT3x_Reader
+EXTRA_COMPONENTS = extras/i2c extras/sht3x
+include ../../../common.mk

examples/sht3x/sht3x_callback_two_sensors/sht3x_callback_two_sensors.c

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+/**
+ * Simple example with two sensors connected to two different I2C interfaces 
+ * using SHT3x driver using callback function to get the results.
+ */
+ 
+#include "espressif/esp_common.h"
+#include "esp/uart.h"
+
+#include "FreeRTOS.h"
+
+// include SHT3x driver
+
+#include "sht3x/sht3x.h"
+
+// define I2C interfaces at which SHTx3 sensors are connected
+#define I2C_1_BUS       0
+#define I2C_1_SCL_PIN   GPIO_ID_PIN((5))
+#define I2C_1_SDA_PIN   GPIO_ID_PIN((4))
+
+#define I2C_2_BUS       1
+#define I2C_2_SCL_PIN   GPIO_ID_PIN((16))
+#define I2C_2_SDA_PIN   GPIO_ID_PIN((14))
+
+#define SHT3x_ADDR_1 0x44
+#define SHT3x_ADDR_2 0x45
+
+static uint32_t sensor1;
+static uint32_t sensor2;
+
+/**
+ * Everything you need is a callback function that can handle
+ * callbacks from the background measurement task of the
+ * SHT3x driver. This function is called periodically
+ * and delivers the actual and average sensor values for 
+ * given sensor.
+ */
+static void my_callback_function (uint32_t sensor, 
+                                  sht3x_value_set_t actual, 
+                                  sht3x_value_set_t average)
+{
+    printf("%.3f Sensor %d: %.2f (%.2f) C, %.2f (%.2f) F, %.2f (%.2f) \n", 
+           (double)sdk_system_get_time()*1e-3, sensor, 
+           actual.c_temperature, average.c_temperature, 
+           actual.f_temperature, average.f_temperature, 
+           actual.humidity, average.humidity);
+}
+
+
+void user_init(void)
+{
+    // Please note: Return values are not considered for readability reasons.
+    // All functions return a boolean that allows effecitve error handling.
+    
+    // Set UART Parameter
+    uart_set_baud(0, 115200);
+
+    // Give the UART some time to settle
+    sdk_os_delay_us(500);
+    
+    // Init I2C bus interfaces at which SHT3x sensors are connected
+    // (different busses are possible)
+    i2c_init(I2C_1_BUS, I2C_1_SCL_PIN, I2C_1_SDA_PIN, I2C_FREQ_100K);
+    i2c_init(I2C_2_BUS, I2C_2_SCL_PIN, I2C_2_SDA_PIN, I2C_FREQ_100K);
+
+    // Init SHT3x driver (parameter is the number of SHT3x sensors used)
+    sht3x_init();
+    
+    // Create sensors
+    sensor1 = sht3x_create_sensor (I2C_1_BUS, SHT3x_ADDR_1);
+    sensor2 = sht3x_create_sensor (I2C_2_BUS, SHT3x_ADDR_2);
+    
+    // Set the callback function
+    sht3x_set_callback_function (sensor1, &my_callback_function);
+    sht3x_set_callback_function (sensor2, &my_callback_function);
+    
+    // Optional: Set the period of measurements (default 1000 ms)
+    sht3x_set_measurement_period (sensor1, 1000);
+    sht3x_set_measurement_period (sensor2, 5000);
+    
+    // Optional: Set the weight for expontial moving average (default 0.2)
+    sht3x_set_average_weight (sensor1, 0.15);
+    sht3x_set_average_weight (sensor2, 0.25);
+
+    // That's it.
+}