20+ Ultrasonic Distance Sensors Compared

Since there are many uses for ultrasonic sensors (Robots, Liquid Level Sensor, Motion Sensor, Vehicle Parking/Backup, on and on....) I compiled a list of 20+ sensors with their min/max ranges along with precision and how it interfaces with your RPi or Arduino. Prices Ranging from ~$2 usd to nearly $175+ usd.  You can connect several to your project with all of these sensors.

Sensor	Min Range	Max Range	Freq.	Precision	Interface	Price (usd)
SRF08	3cm	6m	?	3-4cm	I2c	$50
SRF10	6cm	6m	40 KHz	?	I2c	$33
SRF02	15cm	6m	40 KHz	?	I2c/UART	$14
SRF04	3cm	3m	40 KHz	?	Pulse	$22
SRF05	1cm	4m	40 KHz	?	Pulse	$22
MaxSonar-EZ Series	15cm	6.45m	42 KHz	2.54cm	PWM / Serial / Analog / I2c	$25-$40
ProxSonar-EZ Series	3cm	3m	42 KHz	2.54cm	USB / Serial / Digital Logic	$50
SRF01	0cm	6m	40 KHz	3-4cm	UART	$28
SRF235	10cm	1.2m	235 KHz	3-4cm	I2c	$109
URM04	4cm	5m	40 KHz	1cm	RS485	$26
URM06	20cm	10m	49.5 KHz	1cm	Analog	$59
MaxSonar-WR Series	30cm	10m	42 KHz	.1cm (1mm)	PWM / Serial / Analog / I2c	$99-$175
ParkSonar-EZ Series	15cm	1.84m - 3.66m	42 KHz	2.54cm	PWM / Serial / Analog / I2c	$30
MaxSonar-AE Series	1mm	7m	42 KHz	1cm	Serial / Analog / I2c	$40-$55
US-100	2cm	4.5m	40 KHz	0.3cm	Pulse / UART	$4
US-020	2cm	7m	40 KHz	0.3cm	Pulse	$5
US-015	2cm	4m	40 KHz	3cm	Pulse	$4
HC-SR04	2cm	4m	40 KHz	3cm	Pulse	$3
HY-SRF05 / HC-SR05	2cm	4.5m	40 KHz	0.2cm	Pulse	$2
DYP-ME007Y	30cm	3m	40 KHz	1cm	Pulse	$13
Parallax PING)))	2cm	3m	40 Khz	?	Pulse	$30
URM37	2cm	5m	?	1cm	PWM / UART	$14

Helpful links:

Comparison of URM37 vs MaxSonar and SRF08
http://www.dfrobot.com/index.php?route=DFblog/blog&id=237

Major sellers:

http://www.maxbotix.com/Ultrasonic_Sensors.htm

http://www.robotshop.com/en/ultrasonic-range-finders.html
http://www.dfrobot.com/index.php?route=product/category&path=36_55

Australia:
http://www.robotgear.com.au/Category.aspx/Category/24-Ultrasonic-Range-Finders

Other Comparison Lists:

Temperature Sensors
Relay Hat/Boards for Raspberry Pi