Example source code for Maxim Integrated MAX6605 low-power, inexpensive analog output temperature sensor using the MAX32630FTHR analog input. The MAX6605 precision, low-power, inexpensive, analog output temperature sensor is available in a 5-pin SC70 package. The device has a +2.7V to +5.5V supply voltage range and 10µA supply current over the -55°C to +125°C temperature range.
Dependencies: max32630fthr USBDevice
main.cpp
- Committer:
- phonemacro
- Date:
- 2019-04-27
- Revision:
- 2:9ceed197ca58
- Parent:
- 1:9b9c2989d4eb
File content as of revision 2:9ceed197ca58:
#include "mbed.h" #include "max32630fthr.h" #include "USBSerial.h" MAX32630FTHR pegasus(MAX32630FTHR::VIO_3V3); // Hardware serial port over DAPLink Serial daplink(P2_1, P2_0); // Virtual serial port over USB USBSerial microUSB; DigitalOut rLED(LED1); DigitalOut gLED(LED2); DigitalOut bLED(LED3); /* Analog inputs 0 and 1 have internal dividers to allow measuring 5V signals * The dividers are selected by using inputs AIN_4 and AIN_5 respectively. * The full scale range for AIN0-3 is 1.2V * The full scale range for AIN4-5 is 6.0V */ AnalogIn ain1(AIN_5); const float AIN5_FSV = 6.0f; /* Full scale value for AIN5 */ float celsius_to_fahrenheit(float temp_c) { float temp_f; temp_f = ((temp_c * 9)/5) + 32; return temp_f; } void blink_timer(void) { gLED = !gLED; /* blink the green LED */ } // main() runs in its own thread in the OS // (note the calls to Thread::wait below for delays) /** * @brief Sample main program for MAX6605 * @version 1.0000.0000 * * @details Sample main program for MAX6605 * The MAX6605 precision, low-power, analog output temperature * sensor is available in a 5-pin SC70 (0.65 mm pitch)package. * The device has a +2.7V to +5.5V supply voltage range * and 10µA supply current over the -55°C to +125°C temperature range. * For the -40°C to +105°C temperature range, the supply voltage can go as low as +2.4V. * Supply Current: 10µA * Supply voltage: 2.7V to 5.5V * Accuracy : ±0.75°C 25°C * ±3.00°C 0.0°C to 70°C * ±3.80°C -20°C to 85°C * ±5.00°C -40°C to 100°C * ±5.80°C -55°C to 125°C * * The prints are sent to the terminal window (9600, 8n1). * The program sets the GPIOs to 3.3V and the program * configures the chip and reads temperatures. * To run the program, drag and drop the .bin file into the * DAPLINK folder. After it finishes flashing, cycle the power or * reset the Pegasus (MAX32630FTHR) after flashing by pressing the button on * the Pegasus next to the battery connector or the button * on the MAXREFDES100HDK. */ int main() { float temperature; uint32_t i; const float A = 0.000001604f; const float B = 0.0119f; const float C1 = 0.744f; float c2; microUSB.printf("micro USB serial port\r\n"); rLED = LED_OFF; gLED = LED_OFF; bLED = LED_OFF; Ticker ticker; // calls a callback repeatedly with a timeout ticker.attach(callback(&blink_timer), 1.0f); /* set timer for one second */ daplink.printf("MAX6605 Temperature Sensor\r\n\r\n"); temperature = (float)(((AIN5_FSV * ain1) -0.744f) / 0.0119f); #if 0 daplink.printf("AIN1: %1.5f\n", (AIN5_FSV * ain1) ); // analog inputs 1 #endif daplink.printf("Temperature using Linear Approximation\r\n"); for (i = 0; i < 8; i++) { temperature = (float)(((AIN5_FSV * ain1) -0.744f) / 0.0119f); daplink.printf("temperature: %3.1f degrees C, %3.1f degrees F\r\n", temperature, celsius_to_fahrenheit(temperature)); wait(2); } daplink.printf("\r\n"); daplink.printf("Temperature using the Quadratic Equation\r\n"); for (i = 0; i < 8; i++) { c2 = AIN5_FSV * ain1; temperature = (-B + sqrt(B*B - 4*A*(C1-c2)))/(2*A); daplink.printf("temperature: %3.1f degrees C C, %3.1f degrees F\r\n", temperature, celsius_to_fahrenheit(temperature)); wait(2); } daplink.printf("\r\n\r\n"); while(1) { } }