diff --git a/src/dfrph/dfrph.c b/src/dfrph/dfrph.c
index b5572cbf..21735bcd 100644
--- a/src/dfrph/dfrph.c
+++ b/src/dfrph/dfrph.c
@@ -56,6 +56,17 @@ void dfrph_close(dfrph_context dev)
     free(dev);
 }
 
+upm_result_t dfrph_set_aref(const dfrph_context dev, float aref)
+{
+    dev->m_aref = aref;
+    return UPM_SUCCESS;
+}
+
+float dfrph_get_aref(const dfrph_context dev)
+{
+    return dev->m_aref;
+}
+
 upm_result_t dfrph_set_offset(const dfrph_context dev, float offset)
 {
     dev->m_count_offset = offset;
diff --git a/src/dfrph/dfrph.h b/src/dfrph/dfrph.h
index f163ddb3..5f4b59b9 100644
--- a/src/dfrph/dfrph.h
+++ b/src/dfrph/dfrph.h
@@ -58,6 +58,21 @@ dfrph_context dfrph_init(int16_t pin);
  */
 void dfrph_close(dfrph_context dev);
 
+/**
+ * Set ADC reference voltage
+ * @param dev sensor context pointer
+ * @param aref ADC reference voltage
+ * @return Function result code
+ */
+upm_result_t dfrph_set_aref(const dfrph_context dev, float aref);
+
+/**
+ *  Get sensor aref
+ *  @param dev sensor context pointer
+ *  @return Sensor ADC reference voltage
+ */
+float dfrph_get_aref(const dfrph_context dev);
+
 /**
  * Set sensor offset.  This offset is applied to the return value:
  *     counts = counts + offset