Diff: examples/cn0357_example/main.cpp

Revision:

1:c1f0670bb370

Child:

3:1a8c14043a4e

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/examples/cn0357_example/main.cpp	Wed Mar 30 17:35:04 2016 +0300
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+/**
+*   @file     main.cpp
+*   @brief    Toxic gas sensor shield application
+*   @version  V0.1
+*   @author   ADI
+*   @date     March 2015
+**/
+
+#include "mbed.h"
+#include "cn0357.h"
+
+/** @mainpage
+ * CN0357 single-supply, low noise, portable gas detector circuit using an
+ * electrochemical sensor. The Alphasense CO-AX carbon monoxide sensor is used
+ * in this example. Electrochemical sensors offer several advantages for
+ * instruments that detect or measure the concentration of many toxic gases.
+ * Most sensors are gas specific and have usable resolutions under one part per
+ * million (ppm) of gas concentration.
+ *
+ * EVAL-CN0357 example program for MBED platforms. To achieve connection between
+ * the shield and the ST Nucleo, the following connections need to be made:
+ *
+ * - ICSP pin 1 -> pin 12 of the Arduino header
+ * - ICSP pin 3 -> pin 13 of the Arduino header
+ * - ICSP pin 4 -> pin 11 of the Arduino header
+ * - if VIN is not supplied, 5V to VIN
+ *
+ * @page CN0357 CN0357 Analog Devices wiki page
+ * @brief link->
+ * https://wiki.analog.com/resources/eval/user-guides/eval-adicup360/hardware/cn0357
+ * @page AD7790 AD7790 datasheet
+ * @brief link ->
+ * http://www.analog.com/media/en/technical-documentation/data-sheets/AD7790.pdf
+ * @page AD5270 AD5270 datasheet
+ * @brief link ->
+ * http://www.analog.com/media/en/technical-documentation/data-sheets/AD5270_5271.pdf
+ *
+ */
+const float SENSOR_RANGE = 2000; ///< gas sensor range in PPM
+const float SENSOR_SENSITIVITY = (65 * pow(10, -9)); ///< gas sensor sensitivity in A/ppm - 65 nA/ppm
+
+Serial pc(USBTX, USBRX); ///< Serial interface to the pc
+
+/**
+ @brief Displays CN0357 circuit readings and data to the UART
+
+ @param ui16Data - ADC data register value to be displayed
+ @param fData1   - ADC input voltage reading to be displayed
+ @param fdata2   - Gas Concentration reading to be displayed
+
+ **/
+void display_data(uint16_t ui16Data, float fData1, float fdata2)
+{
+
+    pc.printf("\r\nADC Data Register Value = %#08x", ui16Data); /** Send valid ADC data register value*/
+    pc.printf("\r\nADC Input Voltage input = %f V", fData1); /** Send valid voltage input value */
+    pc.printf("\r\nGas Concentration = %f PPM", fdata2); /** Send valid gas concentration value */
+
+    pc.printf("\r\n");
+}
+
+
+/**
+ * Project entry-point - initializes the CN0357 shield, reads the data when the ADC is ready and outputs the sensor
+ * value in PPM
+ */
+int main()
+{
+    /* Main variables */
+
+
+    CN0357 cn0357;
+    cn0357.init(SENSOR_RANGE, SENSOR_SENSITIVITY);
+
+    /* Infinite loop */
+    while (1) {
+
+        uint8_t ui8Status_Reg = cn0357.read_adc_status(); //  Read ADC Status Register
+
+        if (ui8Status_Reg == 0x08) { //  Checks if ADC data is available
+            uint16_t ui16Adcdata = cn0357.read_sensor();
+            float fAdcVoltage    = cn0357.data_to_voltage(ui16Adcdata); //  Convert ADC data to voltage
+            float fConcentration = cn0357.calc_ppm(fAdcVoltage); //  Convert voltage to Gas concentration
+            display_data(ui16Adcdata, fAdcVoltage, fConcentration); //  Display data thru UART
+
+            // printf("OneshotRead: %f PPM \r\n", cn0357.readPPM());
+        }
+
+        wait_ms(1000);
+    }
+
+    /* Infinite loop, never returns. */
+}
+