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130 CHAPTER 4 ■ SENSORS
The second sensor with a medium range is the Devantech SRF04 sonar module (see Figure 4-15).
It has a range from 1 to 96 inches, and has a cycle time of about 100 milliseconds. It costs
around $24.
Figure 4-15. The Devantech SRF04 Sonar Module
The third type is the Polaroid 6500 ranging module with an instrument grade transducer.
It has a cycle time of about 200 milliseconds, and the transducer and ranging module together
have a range of 1 inch to 35 feet and cost about $49. Figure 4-16 shows three connected at once
with DB9 serial connectors to facilitate easy connection with a microcontroller.
