diff --git a/src/bmp280.c b/src/bmp280.c
index 66c1a2a..6de71e8 100644
--- a/src/bmp280.c
+++ b/src/bmp280.c
@@ -39,6 +39,7 @@ extern  int16_t dig_P9;
 
 static fxp_t m_last_temperature = 0;
 static fxp_t m_last_pressure = 0;
+static bool m_measurements_valid = false;
 
 static int32_t m_temp_raw;
 static int32_t m_press_raw;
@@ -49,6 +50,8 @@ static void cb_i2c_dma(const uint8_t *rdata, size_t rlen);
 
 bool bmp280_init(void)
 {
+	m_measurements_valid = false;
+
 	// configure pins for I2C1
 	gpio_set_af(BMP280_I2C_PORT, GPIO_AF4, BMP280_I2C_SCL | BMP280_I2C_SDA);
 	gpio_mode_setup(BMP280_I2C_PORT, GPIO_MODE_AF, GPIO_PUPD_PULLUP, BMP280_I2C_SCL | BMP280_I2C_SDA);
@@ -214,6 +217,7 @@ bool bmp280_loop(void)
 		case COMPENSATE_PRESSURE:
 			m_last_pressure = bmp280_comp_pressure(m_press_raw);
 			m_readout_state = READY;
+			m_measurements_valid = true;
 			retval = true;
 			break;
 	}
@@ -246,6 +250,12 @@ bool bmp280_start_measurement(void)
 }
 
 
+bool bmp280_are_measurements_valid(void)
+{
+	return m_measurements_valid;
+}
+
+
 fxp_t bmp280_get_temperature(void)
 {
 	return m_last_temperature;
diff --git a/src/bmp280.h b/src/bmp280.h
index 17abd92..b25a2a7 100644
--- a/src/bmp280.h
+++ b/src/bmp280.h
@@ -11,6 +11,7 @@ bool bmp280_loop(void); // returns true if measurements have been updated
 
 bool bmp280_start_measurement(void);
 
+bool bmp280_are_measurements_valid(void);
 fxp_t bmp280_get_temperature(void);
 fxp_t bmp280_get_pressure(void);