Example to show how to read various sensors with STM32 Nucleo board
Dependencies: mbed
main.cpp
- Committer:
- joe_tijerina
- Date:
- 2014-08-27
- Revision:
- 4:de41ec16d765
- Parent:
- 3:6d8574d8c9c1
File content as of revision 4:de41ec16d765:
#include "mbed.h" #include "ADXL345_I2C.h" //#define LED // Grove LED //#define ACCEL // SEN04051P Grove - 3-Axis Digital Accelerometer(±16g) //#define LIGHT_SENSOR // Grove Light Sensor using GL5528 photoresistor //#define WATER_SENSOR // Grove Water Sensor //#define GAS_SENSOR // SEN90512P Grove - Gas Sensor(MQ2) #define TEMP_SENSOR // Grove Temperature Sensor using TTC03 Thermistor AnalogIn temp_sensor(A0); AnalogIn analog_light_sensor_read(A1); DigitalIn water_sensor(A2); AnalogIn gas_sensor(A3); DigitalOut my_led(D7); ADXL345_I2C accelerometer(D14, D15); int main() { float vol; float Rsensor; int gas_sensor_value; int sound_sensor_value; int adc_scale = 4096; int readings[3] = {0, 0, 0}; int sensorValue; int B = 3975; float resistance; float temperature; float temperature_f; char amb_temp[6]; int a; #ifdef ACCEL printf("Starting ADXL345 test...\n\r"); wait(.001); printf("Device ID is: 0x%02x\n\r", accelerometer.getDeviceID()); wait(.001); // These are here to test whether any of the initialization fails. It will print the failure if (accelerometer.setPowerControl(0x00)) { printf("didn't intitialize power control\n"); return 0; } //Full resolution, +/-16g, 4mg/LSB. wait(.001); if(accelerometer.setDataFormatControl(0x0B)) { printf("didn't set data format\n"); return 0; } wait(.001); //3.2kHz data rate. if(accelerometer.setDataRate(ADXL345_3200HZ)) { printf("didn't set data rate\n"); return 0; } wait(.001); //Measurement mode. if(accelerometer.setPowerControl(MeasurementMode)) { printf("didn't set the power control to measurement\n"); return 0; } #endif while(1) { #ifdef LED my_led = 1; // LED is ON wait(0.2); // 200 ms my_led = 0; // LED is OFF wait(1.0); // 1 sec #endif #ifdef WATER_SENSOR printf("water_sensor: %d \n\r", water_sensor.read()); wait(0.5); #endif #ifdef GAS_SENSOR gas_sensor_value = gas_sensor.read_u16(); printf("gas_sensor_value: 0x%X \n\r", gas_sensor_value); vol = (float)gas_sensor_value/adc_scale*5.0; printf("gas vol: %f \n\r", vol); wait(1); #endif #ifdef ACCEL accelerometer.getOutput(readings); wait(0.1); // 100 ms /* x-axis, y-axis and z-axis */ printf("%d, %d, %d\n\r", (int16_t)readings[0], (int16_t)readings[1], (int16_t)readings[2]); #endif #ifdef LIGHT_SENSOR sensorValue = analog_light_sensor_read.read_u16(); Rsensor=(float)(adc_scale-sensorValue)*10/sensorValue; printf("Light Sensor Analog Reading is 0x%X = %d ", sensorValue, sensorValue); printf("The sensor resistance is %f \n\n\r", Rsensor); wait(1); // 1s #endif #ifdef TEMP_SENSOR a = temp_sensor.read_u16(); resistance = (float)(adc_scale-a)*10000/a; //get the resistance of the sensor; temperature = 1/(log(resistance/10000)/B+1/298.15)-273.15; //convert to temperature via datasheet ; temperature_f = (1.8 * temperature) + 32.0; sprintf(amb_temp, "%0.2f", temperature_f); printf("Temp Sensor Analog Reading is 0x%X = %d ", a, a); printf("Current Temperature: %f C %f F \n\r", temperature, temperature_f); wait(1); // 1s #endif } }