diff --git a/lib/sensor_ds18b20.c b/lib/sensor_ds18b20.c
index 0ae2476..1ef6a11 100644
--- a/lib/sensor_ds18b20.c
+++ b/lib/sensor_ds18b20.c
@@ -109,8 +109,14 @@ float sensor_ds18b20_temperature(uint64_t code)
 	}
 
 	// send ROM command to select slave
-	if (!onewire_master_rom_match(code)) { // select specific slave
-		return NAN; // ROM command failed
+	if (0 == code) { // broadcast convert
+		if (!onewire_master_rom_skip()) { // select all slaves
+			return false; // ROM command failed
+		}
+	} else {
+		if (!onewire_master_rom_match(code)) { // select specific slave
+			return false; // ROM command failed
+		}
 	}
 
 	// read scratchpad to get temperature (on byte 0 and 1)
diff --git a/lib/sensor_ds18b20.h b/lib/sensor_ds18b20.h
index 28f2b66..20f1334 100644
--- a/lib/sensor_ds18b20.h
+++ b/lib/sensor_ds18b20.h
@@ -36,7 +36,7 @@ bool sensor_ds18b20_convert(uint64_t code);
  */
 float sensor_ds18b20_temperature(uint64_t code);
 /** set conversion precision
- *  @param[in] code ROM code of sensor to start conversion on (0 for all, if only DS18B20 sensors are on the bus)
+ *  @param[in] code ROM code of sensor to start conversion on (0 for single DS18B20 sensor are on the bus)
  *  @param[in] precision precision in bits (9-12)
  *  @return if operation succeeded
  */