Merge pull request #1375 from lucciano/MAX6675

MAX6675 Support

code/espurna/config/sensors.h

@@ -1025,4 +1025,8 @@
     #include "../sensors/VL53L1XSensor.h"
 #endif
 
+#if MAX6675_SUPPORT
+    #include "../sensors/MAX6675.h"
+#endif 
+
 #endif // SENSOR_SUPPORT

code/espurna/sensor.ino

@@ -726,6 +726,16 @@ void _sensorLoad() {
     }
     #endif
 
+    #if MAX6675_SUPPORT
+    {
+        MAX6675Sensor * sensor = new MAX6675Sensor();
+        sensor->setCS(MAX6675_CS_PIN);
+        sensor->setSO(MAX6675_SO_PIN);
+        sensor->setSCK(MAX6675_SCK_PIN);
+        _sensors.push_back(sensor);
+    }
+    #endif
+
     #if VEML6075_SUPPORT
     {
         VEML6075Sensor * sensor = new VEML6075Sensor();

code/espurna/sensors/MAX6675.h

@@ -0,0 +1,150 @@
+// -----------------------------------------------------------------------------
+// MAX6675 Sensor
+// Uses MAX6675_Thermocouple library
+// Copyright (C) 2017-2018 by Xose Pérez <andrade dot luciano at gmail dot com>
+// -----------------------------------------------------------------------------
+
+#if SENSOR_SUPPORT && MAX6675_SUPPORT
+
+#pragma once
+
+#include "Arduino.h"
+#include "BaseSensor.h"
+#include <vector>
+#include <MAX6675.h>
+
+#define MAX6675_READ_INTERVAL 3000
+
+class MAX6675Sensor : public BaseSensor {
+
+    public:
+
+        // ---------------------------------------------------------------------
+        // Public
+        // ---------------------------------------------------------------------
+
+        MAX6675Sensor(): BaseSensor() {
+            _sensor_id = SENSOR_MAX6675_ID;
+
+        }
+
+        ~MAX6675Sensor() {
+        }
+
+        // ---------------------------------------------------------------------
+	// ---------------------------------------------------------------------
+
+        void setCS(unsigned char pin_cs) {
+            if (_pin_cs == pin_cs) return;
+            _pin_cs = pin_cs;
+            _dirty = true;
+        }
+
+        void setSO(unsigned char pin_so) {
+            if (_pin_so == pin_so) return;
+            _pin_so = pin_so;
+            _dirty = true;
+        }
+
+        void setSCK(unsigned char pin_sck) {
+            if (_pin_sck == pin_sck) return;
+            _pin_sck = pin_sck;
+            _dirty = true;
+        }
+
+        // ---------------------------------------------------------------------
+        // Sensor API
+        // ---------------------------------------------------------------------
+
+        // Initialization method, must be idempotent
+        void begin() {
+
+            if (!_dirty) return;
+
+            //// MAX6675
+	    int units = 1;            // Units to readout temp (0 = raw, 1 = ˚C, 2 = ˚F)
+            if (_max) delete _max;
+            _max = new MAX6675(_pin_cs,_pin_so,_pin_sck,units);
+
+	    _count = 1;
+
+            _ready = true;
+            _dirty = false;
+
+        }
+
+        // Loop-like method, call it in your main loop
+        void tick() {
+            static unsigned long last = 0;
+            if (millis() - last < MAX6675_READ_INTERVAL) return;
+            last = millis();
+
+            last_read = _max->read_temp();
+        }
+
+
+        // Descriptive name of the sensor
+        String description() {
+            char buffer[20];
+            //snprintf(buffer, sizeof(buffer), "MAX6675 @ CS %d", _gpio);
+            snprintf(buffer, sizeof(buffer), "MAX6675 ");
+            return String(buffer);
+        }
+
+        String address(unsigned char index){
+		return String("@ address");
+
+	}
+
+
+        // Address of the device
+        // Descriptive name of the slot # index
+        String slot(unsigned char index) {
+            if (index < _count) {
+            //    char buffer[40];
+            //    uint8_t * address = _devices[index].address;
+            //    snprintf(buffer, sizeof(buffer), "%s (%02X%02X%02X%02X%02X%02X%02X%02X) @ GPIO%d",
+            //        chipAsString(index).c_str(),
+            //        address[0], address[1], address[2], address[3],
+            //        address[4], address[5], address[6], address[7],
+            //        _gpio
+            //    );
+                return description();
+            }
+            return String();
+        }
+
+        // Type for slot # index
+        unsigned char type(unsigned char index) {
+            if (index < _count) return MAGNITUDE_TEMPERATURE;
+            return MAGNITUDE_NONE;
+        }
+
+        // Pre-read hook (usually to populate registers with up-to-date data)
+        void pre() {
+            _error = SENSOR_ERROR_OK;
+        }
+
+        // Current value for slot # index
+        double value(unsigned char index) {
+            return last_read;
+
+        }
+
+    protected:
+
+        // ---------------------------------------------------------------------
+        // Protected
+        // ---------------------------------------------------------------------
+
+        unsigned int _pin_cs = MAX6675_CS_PIN;
+        unsigned int _pin_so = MAX6675_SO_PIN;
+        unsigned int _pin_sck = MAX6675_SCK_PIN;
+        bool _busy = false;
+	double last_read = 0;
+        MAX6675 * _max = NULL;
+
+
+};
+
+#endif // SENSOR_SUPPORT && MAX6675_SUPPORT

code/platformio.ini

@@ -41,7 +41,7 @@ debug_flags = -DDEBUG_ESP_CORE -DDEBUG_ESP_SSL -DDEBUG_ESP_WIFI -DDEBUG_ESP_HTTP
 #    -DPIO_FRAMEWORK_ARDUINO_LWIP2_LOW_MEMORY       = v2 Lower Memory
 #    -DPIO_FRAMEWORK_ARDUINO_LWIP2_HIGHER_BANDWIDTH = v2 Higher Bandwidth
 # ------------------------------------------------------------------------------
-build_flags = -g -w -DMQTT_MAX_PACKET_SIZE=400 -DNO_GLOBAL_EEPROM ${sysenv.ESPURNA_FLAGS} -DPIO_FRAMEWORK_ARDUINO_LWIP_HIGHER_BANDWIDTH
+build_flags = -g -w -DMQTT_MAX_PACKET_SIZE=400 -DNO_GLOBAL_EEPROM ${sysenv.ESPURNA_FLAGS} -DPIO_FRAMEWORK_ARDUINO_LWIP_HIGHER_BANDWIDTH 
 build_flags_512k = ${common.build_flags} -Wl,-Teagle.flash.512k0m1s.ld
 build_flags_1m0m = ${common.build_flags} -Wl,-Teagle.flash.1m0m1s.ld
 build_flags_2m1m = ${common.build_flags} -Wl,-Teagle.flash.2m1m4s.ld
@@ -99,6 +99,7 @@ lib_deps =
     NewPing
     https://github.com/sparkfun/SparkFun_VEML6075_Arduino_Library#V_1.0.3
     https://github.com/pololu/vl53l1x-arduino#1.0.1
+    https://github.com/mcleng/MAX6675-Library#2.0.1
 lib_ignore =
 
 # ------------------------------------------------------------------------------