![](/media/cache/group/hexiweare_logo_main_black.jpg.50x50_q85.jpg)
Very advanced Click Air Quality example for Hexiwear featuring OLED Display, Bluetooth, Cloud and Touch
Dependencies: Hexi_KW40Z Hexi_OLED_SSD1351
This project has been developed by mbed user daveyclk
This project demonstrates the use of the Mikroelektronika Click Air Quality
module with hexiwear featuring the OLED display
, the Bluetooth for Cloud connectivity
and Touch buttons
Plug Hexiwear into the Docking Station and the Air Quality Click to the Click Socket 1
Connect the USB cable to your computer and to the micro-USB port of the Docking Station
Compile the project and copy the binary "Hexi_Click_AirQuality_Example_HEXIWEAR.bin" in the DAP-LINK drive
from your computer file explorer
Press the K64F-RESET button
on the docking station to start the program on your board
The OLED screen will display some graphics
and the Air Quality measurement in ppm below
Blow gently on the sensor
and see the value changing
Graphic displayed will move the Arrow from Green to Purple depending from the ppm value measured by the Air Quality sensor
Download the cell phone App Hexiwear from iOS or Android stores to connect your board to your phone
Type the pin displayed on the screen and give a name to your board to pair it via the App
Congratulation your data are now streamed directly to Wolkabout Cloud...
To visualize the data remotely (over cloud not bluetooth), you can go to Wolksense.com or download the Wolksense iOS/Android App and login with same account
main.cpp
- Committer:
- GregC
- Date:
- 2016-11-04
- Revision:
- 3:97bc87323258
- Parent:
- 2:8e7d89c2cbde
File content as of revision 3:97bc87323258:
/****************************************************************************** * Includes *******************************************************************************/ #include "mbed.h" #include "Hexi_OLED_SSD1351.h" #include "Hexi_KW40Z.h" #include "images.h" #include "new_images.h" #include "string.h" #include "stdbool.h" /****************************************************************************** * Input and Output Pinout *******************************************************************************/ AnalogIn ain(PTB2); SSD1351 oled(PTB22,PTB21,PTC13,PTB20,PTE6, PTD15); // SSD1351 OLED Driver (MOSI,SCLK,POWER,CS,RST,DC) KW40Z kw40z_device(PTE24, PTE25); // Instantiate the Hexi KW40Z Driver (UART TX, UART RX) DigitalOut blueLed(LED3,1); Serial pc(USBTX, USBRX); Thread txThread; /****************************************************************************** * prototypes *******************************************************************************/ void InitModules(); void ReadSensor(); void CalculatePPM(); void DisplayAirQValue(uint16_t value); /****************************************************************************** * Module Variable Definitions *******************************************************************************/ uint16_t ppm; uint16_t value = 0; uint16_t value_old = 0; uint16_t adc_rd; //const uint8_t *image1; // old cover image const uint8_t *green_arrow; // Pointer for the image to be displayed const uint8_t *yellow_arrow; // Pointer for the image to be displayed const uint8_t *orange_arrow; // Pointer for the image to be displayed const uint8_t *red_arrow; // Pointer for the image to be displayed const uint8_t *purple_arrow; // Pointer for the image to be displayed char text[20]; // Text Buffer for dynamic value displayed bool test = false; // used to put the program in text mode to check images /************************************************************************************************** * Call Back Functions **************************************************************************************************/ void ButtonRight(void) { kw40z_device.ToggleAdvertisementMode(); } void ButtonLeft(void) { kw40z_device.ToggleAdvertisementMode(); } void PassKey(void) { /* Display Bond Pass Key in a 95px by 18px textbox at x=0,y=40 */ sprintf(text,"%d", kw40z_device.GetPassKey()); oled.TextBox((uint8_t *)text,0,72,95,18); } /************************************************************************************************** * Function Main() * ------------------------------------------------------------------------------------------------- * Overview: * Input: None * Output: None **************************************************************************************************/ int main() { InitModules(); while (true) { ReadSensor(); pc.printf("Sensor Value 0x%04X\n\r",ain.read_u16()); blueLed = !kw40z_device.GetAdvertisementMode(); /*Indicate BLE Advertisment Mode*/ CalculatePPM(); DisplayAirQValue(ppm); Thread::wait(500); } } /************************************************************************************************** * Function TxTask() **************************************************************************************************/ void txTask(void){ while (true) { /*Notify Hexiwear App that it is running Sensor Tag mode*/ kw40z_device.SendSetApplicationMode(GUI_CURRENT_APP_SENSOR_TAG); kw40z_device.SendPressure(10*ppm); //send ppm Air Quality Click value Thread::wait(1000); } } /************************************************************************************************** * Function InitModules() * ------------------------------------------------------------------------------------------------- * Overview: * Input: None * Output: None **************************************************************************************************/ void InitModules() { //image1 = AirQuality; // Setting pointer location of the 96 by 96 pixel bitmap //oled.DrawImage(image1,0,0); // Fill 96px by 96px Screen with 96px by 96px NXP Image starting at x=0,y=0 green_arrow = Green_arrow_bmp; // Setting pointer location of the 96 by 96 pixel bitmap Arrow Point to Green To begin yellow_arrow = Yellow_arrow_bmp; // Setting pointer location of the 96 by 96 pixel bitmap orange_arrow = Orange_arrow_bmp; // Setting pointer location of the 96 by 96 pixel bitmap red_arrow = Red_arrow_bmp; // Setting pointer location of the 96 by 96 pixel bitmap purple_arrow = Purple_arrow_bmp; // Setting pointer location of the 96 by 96 pixel bitmap oled.DrawImage(green_arrow,0,0); // Fill 96px by 96px Screen with 96px by 96px NXP Image starting at x=0,y=0 oled_text_properties_t textProperties = {0}; // Get OLED Class Default Text Properties oled.GetTextProperties(&textProperties); /* Register callbacks to application functions */ kw40z_device.attach_buttonLeft(&ButtonLeft); kw40z_device.attach_buttonRight(&ButtonRight); kw40z_device.attach_passkey(&PassKey); //PPM text now in the Bitmap //textProperties.fontColor = COLOR_BLUE; // Set text properties to white and right aligned for the dynamic text //textProperties.alignParam = OLED_TEXT_ALIGN_LEFT; //oled.SetTextProperties(&textProperties); //strcpy((char *) text,"ppm:"); // Display Legends // oled.Label((uint8_t *)text,15,75); textProperties.fontColor = COLOR_WHITE; // Set text properties to white and right aligned for the dynamic text textProperties.alignParam = OLED_TEXT_ALIGN_RIGHT; oled.SetTextProperties(&textProperties); sprintf(text,"%i",value); // Format the value oled.TextBox((uint8_t *)text,55,76,20,15); //Increase textbox for more digits txThread.start(txTask); /*Start transmitting Sensor Tag Data */ } /************************************************************************************************** * Function ReadSensor() * ------------------------------------------------------------------------------------------------- * Overview: Read sensor. * Input: None * Output: None **************************************************************************************************/ void ReadSensor() { adc_rd = ain.read_u16(); wait_ms(10); } /************************************************************************************************** * Function CalculatePPM() * ------------------------------------------------------------------------------------------------- * Overview: Calculation of PPM. * Input: None * Output: None **************************************************************************************************/ void CalculatePPM() { const double Rl = 5000.0; // Rl (Ohm) - Load resistance const double Vadc_33 = 0.0000503548; // ADC step 3,3V/65535 0.00503mV (16bit ADC) double Vrl; // Output voltage double Rs; // Rs (Ohm) - Sensor resistance double ratio; // Rs/Rl ratio double lgPPM; Vrl = (double)adc_rd * Vadc_33; // For 3.3V Vcc use Vadc_33 Rs = Rl * (3.3 - Vrl)/Vrl; // Calculate sensor resistance ratio = Rs/Rl; // Calculate ratio lgPPM = (log10(ratio) * -0.8) + 0.9; // Calculate ppm ppm = 6* pow(10,lgPPM); // Calculate ppm } /************************************************************************************************** * Function DisplayAirQValue() * ------------------------------------------------------------------------------------------------- * Overview: * Input: None * Output: None **************************************************************************************************/ void DisplayAirQValue(uint16_t value ) { if (value_old != value) { if( value > 200) oled.DrawImage(purple_arrow,0,0); // Fill 96px by 96px Screen with 96px by 96px NXP Image starting at x=0,y=0 else if (value < 200 && value > 150) oled.DrawImage(red_arrow,0,0); else if (value < 150 && value > 100) oled.DrawImage(orange_arrow,0,0); else if (value < 100 && value > 50) oled.DrawImage(yellow_arrow,0,0); else oled.DrawImage(green_arrow,0,0); oled_text_properties_t textProperties = {0}; // Get OLED Class Default Text Properties oled.GetTextProperties(&textProperties); // clear the previous value textProperties.fontColor = COLOR_WHITE; // Set text properties to white and right aligned for the dynamic text textProperties.alignParam = OLED_TEXT_ALIGN_RIGHT; oled.SetTextProperties(&textProperties); sprintf(text,"%i",value_old); // Format the value oled.TextBox((uint8_t *)text,55,76,20,15); //Increase textbox for more digits // display the new value textProperties.fontColor = COLOR_WHITE; // Set text properties to white and right aligned for the dynamic text textProperties.alignParam = OLED_TEXT_ALIGN_RIGHT; oled.SetTextProperties(&textProperties); sprintf(text,"%i",value); // Format the value oled.TextBox((uint8_t *)text,55,76,20,15); //Increase textbox for more digits } value_old = value; }