Joseph Ellsworth / Mbed 2 deprecated xj-Nucleo-F303K8-SHT75-TEST

Testing SHT75 humidity sensor on STM F303K8 board.

Dependencies:   SHT75 mbed

Fork of Nucleo-F303K8-SSD1306_OLED by Joseph Ellsworth

Sample code to test SHT75 humidity sensor using STM F303K8 board. Uses a 3.3V from board to power sensor. 10K resistor Pull-up on data. Must not be on same pins as I2C. Uses D0 for Clk and D1 for Data.

I had to modify sample code supplied by https://developer.mbed.org/users/nimbusgb/code/SHT75/ because the sensor failed to read without the softReset() and readStatus() at beginning of measurement loop. I think this is caused by the 72Mhtz speed of the F303K8 but did not attempt to fully diagnose.

The readStatus() method from library seems to malfunction and always return a -1 which never changes even when sensor is unplugged.

See https://www.sensirion.com/fileadmin/user_upload/customers/sensirion/Dokumente/Humidity_Sensors/Sensirion_Humidity_Sensors_SHT7x_Datasheet_V5.pdf section 2.1 for wiring.

main.cpp@3:47148198f5f2, 2016-03-30 (annotated)

Committer:
joeata2wh
Date:
Wed Mar 30 14:49:21 2016 +0000
Revision:
3:47148198f5f2
Parent:
2:dc3e84d595c3
Child:
4:2c46c3bc8032
update to use MIT license

Who changed what in which revision?

UserRevisionLine numberNew contents of line
joeata2wh 1:90d213185462 1 /* Example of Reading all the ADC pins PIN and display ot OLED display using
joeata2wh 3:47148198f5f2 2 Nucleo_F303K8. Displays voltage read from first 2 ADC lines on OLED display
joeata2wh 2:dc3e84d595c3 3
joeata2wh 3:47148198f5f2 4 By Joseph Ellsworth CTO of A2WH
joeata2wh 3:47148198f5f2 5 Take a look at A2WH.com Producing Water from Air using Solar Energy
joeata2wh 3:47148198f5f2 6 March-2016 License: https://developer.mbed.org/handbook/MIT-Licence
joeata2wh 3:47148198f5f2 7 Please contact us http://a2wh.com for help with custom design projects.
joeata2wh 3:47148198f5f2 8
joeata2wh 3:47148198f5f2 9
joeata2wh 2:dc3e84d595c3 10 Used to Drive:
joeata2wh 1:90d213185462 11 ebay part http://www.ebay.com/itm/152000005331?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT
joeata2wh 1:90d213185462 12 0-96-I2C-IIC-SPI-Serial-White-OLED-LCD-LED-Display-Module-128X64
joeata2wh 1:90d213185462 13 The Datasheet. https://www.adafruit.com/datasheets/SSD1306.pdf
joeata2wh 2:dc3e84d595c3 14
joeata2wh 1:90d213185462 15 Unfortunately this part never turns on using the SSD1308 library.
joeata2wh 2:dc3e84d595c3 16 but did find that the https://developer.mbed.org/users/nkhorman/code/Adafruit_GFX/
joeata2wh 2:dc3e84d595c3 17 library works. Unfortunately the Adafruit library doesn't include the scroll functionality.
joeata2wh 2:dc3e84d595c3 18
joeata2wh 1:90d213185462 19 Using my I2C address scanner I found that it responds on Added 120 (x78) ,121 (x79)
joeata2wh 2:dc3e84d595c3 20 and when the part was unsoldered nothing responded on 120 or 121. According to
joeata2wh 1:90d213185462 21 to the page #19 (8.1.5) of the data sheet the I2C address should be 011110
joeata2wh 2:dc3e84d595c3 22 which seems to map correctly to dec=120 hex=79
joeata2wh 2:dc3e84d595c3 23
joeata2wh 1:90d213185462 24 */
joeata2wh 0:fa185766e039 25
joeata2wh 0:fa185766e039 26 #include "mbed.h"
joeata2wh 2:dc3e84d595c3 27 //#include "SSD1308.h"
joeata2wh 2:dc3e84d595c3 28 #include "Adafruit_SSD1306.h"
joeata2wh 0:fa185766e039 29
joeata2wh 1:90d213185462 30 //#include "mbed_logo.h"
joeata2wh 2:dc3e84d595c3 31
joeata2wh 2:dc3e84d595c3 32 //Pin Defines for I2C Bus
joeata2wh 2:dc3e84d595c3 33 #define D_SDA PB_7 // specific for Nucleo-F303K8
joeata2wh 2:dc3e84d595c3 34 #define D_SCL PB_6 // specific for Nucleo-F303K8
joeata2wh 2:dc3e84d595c3 35 I2C i2c(D_SDA, D_SCL);
joeata2wh 2:dc3e84d595c3 36
joeata2wh 2:dc3e84d595c3 37 // Host PC Communication channels
joeata2wh 2:dc3e84d595c3 38 Serial pc(USBTX, USBRX); // tx, rx
joeata2wh 2:dc3e84d595c3 39
joeata2wh 2:dc3e84d595c3 40 AnalogIn pa0(PA_0);
joeata2wh 2:dc3e84d595c3 41 AnalogIn pa1(PA_1);
joeata2wh 3:47148198f5f2 42 PwmOut fan1(D11);
joeata2wh 3:47148198f5f2 43 //PwmOut fan2(D12);
joeata2wh 3:47148198f5f2 44 //PwmOut fan3(PA_2);
joeata2wh 3:47148198f5f2 45 DigitalOut fan2x(D12);
joeata2wh 2:dc3e84d595c3 46
joeata2wh 0:fa185766e039 47 DigitalOut myled(LED1);
joeata2wh 0:fa185766e039 48 const float voltMeterARef = 3.3;
joeata2wh 0:fa185766e039 49
joeata2wh 2:dc3e84d595c3 50 // an I2C sub-class that provides a constructed default
joeata2wh 2:dc3e84d595c3 51 class I2CPreInit : public I2C
joeata2wh 2:dc3e84d595c3 52 {
joeata2wh 2:dc3e84d595c3 53 public:
joeata2wh 2:dc3e84d595c3 54 I2CPreInit(PinName sda, PinName scl) : I2C(sda, scl) {
joeata2wh 2:dc3e84d595c3 55 frequency(400000);
joeata2wh 2:dc3e84d595c3 56 start();
joeata2wh 2:dc3e84d595c3 57 };
joeata2wh 2:dc3e84d595c3 58 };
joeata2wh 0:fa185766e039 59
joeata2wh 2:dc3e84d595c3 60
joeata2wh 2:dc3e84d595c3 61 I2CPreInit gI2C(D_SDA,D_SCL);
joeata2wh 2:dc3e84d595c3 62 Adafruit_SSD1306_I2c gOled2(gI2C,PB_5);
joeata2wh 1:90d213185462 63
joeata2wh 0:fa185766e039 64
joeata2wh 2:dc3e84d595c3 65 float readPrint(AnalogIn ain, char *label)
joeata2wh 2:dc3e84d595c3 66 {
joeata2wh 2:dc3e84d595c3 67 float tval = ain.read();
joeata2wh 2:dc3e84d595c3 68 float volts = tval * voltMeterARef;
joeata2wh 3:47148198f5f2 69 float perc = tval * 100.0f;
joeata2wh 2:dc3e84d595c3 70 unsigned short tvalu16 = ain.read_u16 ();
joeata2wh 3:47148198f5f2 71 pc.printf("adc %s R=%3.3f V=%3.3f U16=%u\r\n",label, tval, volts, tvalu16);
joeata2wh 2:dc3e84d595c3 72 gOled2.printf("%s=%3.3fV\r\n",label,volts);
joeata2wh 2:dc3e84d595c3 73 gOled2.display();
joeata2wh 2:dc3e84d595c3 74 return tval;
joeata2wh 2:dc3e84d595c3 75 }
joeata2wh 2:dc3e84d595c3 76
joeata2wh 2:dc3e84d595c3 77
joeata2wh 2:dc3e84d595c3 78 int main()
joeata2wh 2:dc3e84d595c3 79 {
joeata2wh 3:47148198f5f2 80 pc.baud(9600);
joeata2wh 2:dc3e84d595c3 81 // Display with the Adafruit Library
joeata2wh 2:dc3e84d595c3 82 gOled2.printf("%ux%u OLED Display\r\n", gOled2.width(), gOled2.height());
joeata2wh 2:dc3e84d595c3 83 wait(5);
joeata2wh 2:dc3e84d595c3 84 gOled2.clearDisplay();
joeata2wh 0:fa185766e039 85 while(1) {
joeata2wh 2:dc3e84d595c3 86 myled = !myled;
joeata2wh 2:dc3e84d595c3 87 gOled2.clearDisplay();
joeata2wh 2:dc3e84d595c3 88 gOled2.setTextCursor(1,1);
joeata2wh 2:dc3e84d595c3 89 readPrint(pa0, "PA_0");
joeata2wh 2:dc3e84d595c3 90 wait(0.1);
joeata2wh 2:dc3e84d595c3 91 gOled2.setTextCursor(1,10);
joeata2wh 2:dc3e84d595c3 92 readPrint(pa1, "PA_1");
joeata2wh 3:47148198f5f2 93
joeata2wh 3:47148198f5f2 94 float pwmpw = 0.3; //0.0005; //0.09; // 0.1001;
joeata2wh 3:47148198f5f2 95 float pwmpp = 3.0; //0.00001; //0.0001; // 0.01001;
joeata2wh 3:47148198f5f2 96 //fan2.period_ms();
joeata2wh 3:47148198f5f2 97 //fan2.pulsewidth_ms(200);
joeata2wh 3:47148198f5f2 98
joeata2wh 3:47148198f5f2 99 //float pwmpw = 0.1; //0.0005; //0.09; // 0.1001;
joeata2wh 3:47148198f5f2 100 //float pwmpp = 1.0; //0.00001; //0.0001; // 0.01001;
joeata2wh 3:47148198f5f2 101 //fan2.pulsewidth(0.1);
joeata2wh 3:47148198f5f2 102 //fan2.period(1.0 / 10.0);
joeata2wh 3:47148198f5f2 103 //fan2.pulsewidth(2.0);
joeata2wh 3:47148198f5f2 104 //fan2.period(20);
joeata2wh 3:47148198f5f2 105 float pwmduty = 0.1f;
joeata2wh 3:47148198f5f2 106 float unit_time = 10.0;
joeata2wh 3:47148198f5f2 107 float total_period = 0.1; //0.7; //3.5; //0.8;
joeata2wh 3:47148198f5f2 108 float num_cycle = (unit_time / total_period) + 1;
joeata2wh 3:47148198f5f2 109
joeata2wh 3:47148198f5f2 110 while (pwmduty <= 1.1f) {
joeata2wh 3:47148198f5f2 111 float on_time = total_period * pwmduty;
joeata2wh 3:47148198f5f2 112 float off_time = total_period - on_time;
joeata2wh 3:47148198f5f2 113 //gOled2.clearDisplay();
joeata2wh 3:47148198f5f2 114 gOled2.setTextCursor(1,20);
joeata2wh 3:47148198f5f2 115 wait(0.1);
joeata2wh 3:47148198f5f2 116 gOled2.printf("pwm=%3.3f\r\n", pwmduty);
joeata2wh 3:47148198f5f2 117 wait(0.1);
joeata2wh 3:47148198f5f2 118 gOled2.display();
joeata2wh 3:47148198f5f2 119 wait(0.1);
joeata2wh 3:47148198f5f2 120 gOled2.display();
joeata2wh 3:47148198f5f2 121 wait(0.1);
joeata2wh 3:47148198f5f2 122 pc.printf("pwm=%3.3f\r\n", pwmduty);
joeata2wh 3:47148198f5f2 123 //wait(3.0);
joeata2wh 3:47148198f5f2 124 fan2x = 1;
joeata2wh 3:47148198f5f2 125 wait(0.15);
joeata2wh 3:47148198f5f2 126 for (int x=0; x<= num_cycle; x++) {
joeata2wh 3:47148198f5f2 127
joeata2wh 3:47148198f5f2 128 fan2x = 1;
joeata2wh 3:47148198f5f2 129 wait(on_time);
joeata2wh 3:47148198f5f2 130 fan2x = 0;
joeata2wh 3:47148198f5f2 131 wait(off_time);
joeata2wh 3:47148198f5f2 132 // accelerate to get the motor turning
joeata2wh 3:47148198f5f2 133 // then slow down to the current speed;
joeata2wh 3:47148198f5f2 134 //fan1 = 0.0;
joeata2wh 3:47148198f5f2 135 //fan2 = 0.0;
joeata2wh 3:47148198f5f2 136 //fan3 = 0.0;
joeata2wh 3:47148198f5f2 137 //wait(0.02);
joeata2wh 3:47148198f5f2 138 //fan1 = pwmduty;
joeata2wh 3:47148198f5f2 139 //fan2 = pwmduty;
joeata2wh 3:47148198f5f2 140 //fan3 = pwmduty;
joeata2wh 3:47148198f5f2 141 //fan2 = pwmduty;
joeata2wh 3:47148198f5f2 142 //fan2.period(pwmduty/100);
joeata2wh 3:47148198f5f2 143 //fan2.period(pwmduty);
joeata2wh 3:47148198f5f2 144
joeata2wh 3:47148198f5f2 145 }
joeata2wh 3:47148198f5f2 146 pwmduty+= 0.1f;
joeata2wh 3:47148198f5f2 147 }
joeata2wh 3:47148198f5f2 148 //fan1 = 0.0;
joeata2wh 3:47148198f5f2 149 //fan2 = 0.0;
joeata2wh 3:47148198f5f2 150 //fan3 = 0.0;
joeata2wh 2:dc3e84d595c3 151 wait(3.0);
joeata2wh 0:fa185766e039 152 }
joeata2wh 0:fa185766e039 153 }