microcontrolador digitales2
Maxim MAX6675 Cold-Junction-Compensated K-Thermocoupleto-Digital Converter (0°C to 1024°C) os2 and os5
Dependents: STM32_ADC_InternalChannels tareabrayan2
Diff: max6675.cpp
- Revision:
- 0:7c1c768af92a
- Child:
- 2:74731b8476a0
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/max6675.cpp Thu May 09 22:17:49 2019 +0000
@@ -0,0 +1,30 @@
+
+#include "max6675.h"
+
+max6675::max6675(PinName miso, PinName sclk, PinName cs) :
+ max(NC, miso, sclk), _cs(cs)
+{
+ max.format(16,1); // set 16 bit SPI format
+ max.frequency(4000000);
+}
+float max6675::gettemp(int cf)
+{
+ float temp = 0;
+ int tempByte= 0;
+
+ _cs = 0;
+ wait_us(1); // wait to stablize
+ tempByte = max.write(0);
+ wait_us(1); // wait to finish
+ _cs = 1;
+
+ if (tempByte & (1<<2)) { // faulty or no sensor connected
+ return -99;
+ } else {
+ temp = (tempByte)/32.0f;
+ }
+ if(cf) {
+ temp = (temp*9.0f/5.0f) + 32.0f; // Convert value to ˚F
+ }
+ return temp;
+}