3 files changed, 103 insertions, 0 deletions
diff --git a/src/tempmodule/indicator.c b/src/tempmodule/indicator.c
new file mode 100644
index 0000000..3991f93
--- /dev/null
+++ b/src/tempmodule/indicator.c
@@ -0,0 +1,89 @@
+#include "indicator.h"
+
+#define HIGH 1
+#define LOW 0
+#define OUTPUT 1
+
+struct indicator {
+	unsigned int red;
+	unsigned int green;
+	unsigned int blue;
+	unsigned int current_temp;
+	unsigned int calibration[4];
+};
+
+static struct indicator state;
+static const unsigned int redled = 5;	/* D1 */
+static const unsigned int greenled = 4;	/* D2 */
+static const unsigned int blueled = 14;	/* D5 */
+
+static void indicator_set_state(unsigned int red, unsigned int green, unsigned int blue);
+
+void indicator_init(unsigned int temp, unsigned int const * const calibration)
+{
+	static const unsigned int default_calibration[] = {3430, 3330, 3230, 3130};
+
+	pinMode(redled, OUTPUT);
+	pinMode(greenled, OUTPUT);
+	pinMode(blueled, OUTPUT);
+
+	state.current_temp = temp;
+
+	if (calibration) {
+		indicator_calibrate(calibration);
+	} else {
+		indicator_calibrate(default_calibration);
+	}
+
+}
+
+void indicator_update(unsigned int temp)
+{
+	if (temp > state.calibration[0]) {
+		indicator_set_state(1, 0, 0);
+	} else if (temp > state.calibration[1]) {
+		indicator_set_state(1, 1, 0);
+	} else if (temp >= state.calibration[2]) {
+		indicator_set_state(0, 1, 0);
+	} else if (temp >= state.calibration[3]) {
+		indicator_set_state(0, 1, 1);
+	} else if (temp < state.calibration[3]) {
+		indicator_set_state(0, 0, 1);
+	}
+}
+
+void indicator_calibrate(unsigned int const * const calibration)
+{
+	memcpy(state.calibration, calibration, sizeof(state.calibration));
+	indicator_update(state.current_temp);
+}
+
+static void indicator_set_state(unsigned int red, unsigned int green, unsigned int blue)
+{
+	if (red != state.red) {
+		if (red) {
+			digitalWrite(redled, HIGH);
+		} else {
+			digitalWrite(redled, LOW);
+		}
+		state.red = red;
+	}
+
+	if (green != state.green) {
+		if (green) {
+			digitalWrite(greenled, HIGH);
+		} else {
+			digitalWrite(greenled, LOW);
+		}
+		state.green = green;
+	}
+
+	if (blue != state.blue) {
+		if (blue) {
+			digitalWrite(blueled, HIGH);
+		} else {
+			digitalWrite(blueled, LOW);
+		}
+		state.blue = blue;
+	}
+}
diff --git a/src/tempmodule/indicator.h b/src/tempmodule/indicator.h
new file mode 100644
index 0000000..21eec29
--- /dev/null
+++ b/src/tempmodule/indicator.h
@@ -0,0 +1,11 @@
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+void indicator_init(unsigned int temp, unsigned int const * const calibration);
+void indicator_update(unsigned int temp);
+void indicator_calibrate(unsigned int const * const calibration);
+
+#ifdef __cplusplus
+}
+#endif
diff --git a/src/tempmodule/main.ino b/src/tempmodule/main.ino
index dd2d723..7f8bf3f 100644
--- a/src/tempmodule/main.ino
+++ b/src/tempmodule/main.ino
@@ -23,6 +23,7 @@
 #include <stddef.h>
 #include <string.h>
 #include <inttypes.h>
+#include "indicator.h"
 
 struct temptuple {
 	short res;	/* Resistance in ohms. */
@@ -55,6 +56,7 @@ void setup(void)
 	static const char * const password = "password";
 
 	pinMode(iled, OUTPUT);
+	indicator_init(0, NULL);
 	wifi_connect(ssid, password, 1, iled);
 	Udp.begin(port);
 	discover_client();
@@ -84,6 +86,7 @@ void loop(void)
 		sleep();
 	}
 
+	indicator_update(data);
 	blink_led(iled, 20, 80);
 	++ticker;
 }