diff --git a/src/htu21d/htu21d.cpp b/src/htu21d/htu21d.cpp
index 5e04cb80..c7e4683a 100644
--- a/src/htu21d/htu21d.cpp
+++ b/src/htu21d/htu21d.cpp
@@ -203,14 +203,13 @@ HTU21D::testSensor(void)
     float fTemp, fHum;
     float fTempMax, fTempMin;
     float fHumMax, fHumMin;
-    float fHumFirst, fTempFirst;
+    float fTempFirst;
 
     fprintf(stdout, "Executing Sensor Test\n" );
 
     fHum  = getHumidity(true);
     fTemp = getTemperature(false);
     fTempFirst = fTempMax = fTempMin = fTemp;
-    fHumFirst  = fHumMax  = fHumMin  = fHum;
 
     // Turn on the heater to make a sensor change
     setHeater(true);
diff --git a/src/lpd8806/lpd8806.cxx b/src/lpd8806/lpd8806.cxx
index 6f0bffbf..5593dadc 100644
--- a/src/lpd8806/lpd8806.cxx
+++ b/src/lpd8806/lpd8806.cxx
@@ -60,13 +60,11 @@ LPD8806::LPD8806 (uint16_t pixelCount, uint8_t csn) : m_csnPinCtx(csn), m_spi(0)
 
     uint8_t  latchBytes;
     uint16_t dataBytes, totalBytes;
-    uint16_t numBytes = 0;
 
     dataBytes  = m_pixelsCount * 3;
     latchBytes = (m_pixelsCount + 31) / 32;
     totalBytes = dataBytes + latchBytes;
     if ((m_pixels = (uint8_t *) malloc(totalBytes))) {
-        numBytes = totalBytes;
         memset ( m_pixels           , 0x80, dataBytes);  // Init to RGB 'off' state
         memset (&m_pixels[dataBytes], 0   , latchBytes); // Clear latch bytes
     }
diff --git a/src/max31723/max31723.cxx b/src/max31723/max31723.cxx
index f34dd886..512d5b31 100644
--- a/src/max31723/max31723.cxx
+++ b/src/max31723/max31723.cxx
@@ -51,11 +51,10 @@ MAX31723::MAX31723 (int csn) : m_csnPinCtx(csn), m_spi(0) {
 
 short
 MAX31723::getTemperature () {
-    uint8_t lsb = 0;
     uint8_t msb = 0;
     short temperature = 0;
 
-    lsb = readRegister (R_TEMPERATURE_LSB);
+    readRegister (R_TEMPERATURE_LSB);
     msb = readRegister (R_TEMPERATURE_MSB);
 
     if ((msb & 0x80) != 0) {
@@ -91,12 +90,11 @@ MAX31723::readRegister (uint8_t reg) {
 void
 MAX31723::writeRegister (uint8_t reg, uint8_t data) {
     uint8_t     buffer[2]   = { 0x00, 0x00 };
-    uint8_t*    sensorData  = NULL;
 
     CSOn ();
     buffer[0] = reg;
     buffer[1] = data;
-    sensorData = m_spi.write(buffer, 2);
+    m_spi.write(buffer, 2);
     CSOff ();
 }