diff --git a/fantemp/controller.cpp b/fantemp/controller.cpp
index 40b4f83..5f3c931 100644
--- a/fantemp/controller.cpp
+++ b/fantemp/controller.cpp
@@ -18,19 +18,19 @@ void Controller::init()
 void Controller::callback()
 {
 	sample();
-	mapTemperature();
+	m_fanSpeed = mapTemperature(m_temperature);
 	pwm::setDuty(m_fanSpeed);
 }
 
+uint8_t Controller::mapTemperature(double temperature)
+{
+	double fanSpeed = (10 * temperature - 200) / 3;
+	return clamp<uint8_t>(fanSpeed, 0, 100);
+}
+
 void Controller::sample()
 {
 	m_adcSample = m_thermistor.sampleAdc(m_adcPin, 1000);
 	m_resistance = m_thermistor.getResistance(m_adcSample);
 	m_temperature = m_thermistor.getTemperature(m_resistance);
 }
-
-void Controller::mapTemperature()
-{
-	double fanSpeed = (10 * m_temperature - 200) / 3;
-	m_fanSpeed = clamp<uint8_t>(fanSpeed, 0, 100);
-}
diff --git a/fantemp/controller.hpp b/fantemp/controller.hpp
index 74dd7db..a4bb661 100644
--- a/fantemp/controller.hpp
+++ b/fantemp/controller.hpp
@@ -17,6 +17,8 @@ class Controller {
 
 	static void callback();
 
+	static uint8_t mapTemperature(double temperature);
+
   private:
 	using adc_conf = adc::Config<adc::SingleMode>;
 	static adc::Adc<adc_conf, io::P, io::P::C0> m_adcPin;
@@ -34,6 +36,4 @@ class Controller {
 			return upper;
 		return static_cast<T>(value);
 	}
-
-	static void mapTemperature();
 };
diff --git a/fantemp/terminal.hpp b/fantemp/terminal.hpp
index a6a20f0..280f39e 100644
--- a/fantemp/terminal.hpp
+++ b/fantemp/terminal.hpp
@@ -13,6 +13,7 @@
 GF(ENDL, "\r\n");
 GF(HELP_CMD, "help");
 GF(SHOW_CMD, "show");
+GF(CURVE_CMD, "curve");
 
 constexpr auto BACKSPACE = uint8_t{0x7f};
 constexpr auto CTRL_C = uint8_t{0x03};
@@ -92,6 +93,8 @@ class Terminal {
 				printHelp();
 			} else if (strncmp_P(m_inputBuffer, reinterpret_cast<const char *>(SHOW_CMD), m_inputSize) == 0) {
 				showState();
+			} else if (strncmp_P(m_inputBuffer, reinterpret_cast<const char *>(CURVE_CMD), m_inputSize) == 0) {
+				printCurve();
 			} else {
 				printUnknown();
 			}
@@ -101,8 +104,9 @@ class Terminal {
 	static void printHelp()
 	{
 		m_serial << F("FanTemp command overview: ") << ENDL;
-		m_serial << HELP_CMD << F(" .: print this help message") << ENDL;
-		m_serial << SHOW_CMD << F(" .: shows current temperature and fan speed") << ENDL;
+		m_serial << HELP_CMD << F(" ..: print this help message") << ENDL;
+		m_serial << SHOW_CMD << F(" ..: shows current temperature and fan speed") << ENDL;
+		m_serial << CURVE_CMD << F(" .: shows the curve used to map temperature to fan speed") << ENDL;
 	}
 
 	static void showState()
@@ -118,6 +122,19 @@ class Terminal {
 		m_serial << F("Fan speed ...: ") << Controller::m_fanSpeed << F("%") << ENDL;
 	}
 
+	static void printCurve()
+	{
+		for (uint8_t i = 10; i <= 60; ++i) {
+			m_serial << i << F(" C = ");
+			m_serial.template txNumber<uint8_t, 10, 3, ' '>(Controller::mapTemperature(i));
+			m_serial << F("%\t");
+			for (uint8_t s = 0; s < Controller::mapTemperature(i); ++s) {
+				m_serial << "#";
+			}
+			m_serial << ENDL;
+		}
+	}
+
 	static void printUnknown()
 	{
 		m_serial << F("Unknown command \"");