https://github.com/drom/pulsar

:speaker: Ultrasonic air speed sensor
https://github.com/drom/pulsar

Last synced: 3 months ago
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:speaker: Ultrasonic air speed sensor

• Host: GitHub
• URL: https://github.com/drom/pulsar
• Owner: drom
• License: mit
• Created: 2015-03-10T05:52:46.000Z (over 11 years ago)
• Default Branch: master
• Last Pushed: 2015-03-10T15:29:13.000Z (over 11 years ago)
• Last Synced: 2025-01-24T19:41:21.034Z (over 1 year ago)
• Language: Verilog
• Homepage:
• Size: 262 KB
• Stars: 1
• Watchers: 5
• Forks: 2
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

          
## Ultrasonic Transducer experiments

### experiment #1

Off-the-eBay-shelf 40 KHz, 25 mm x2 transducers:

![alt text](40khz_25mm_transducer.JPG "Transducer")

Terasic DE0-Nano board with Altera Cyclone IV FPGA (EP4CE22F17C6):

![alt text](http://www.terasic.com.tw/attachment/archive/593/image/image_60_thumb.jpg "Terasic DE0-Nano board")

:red_circle: *Red line:* (Transmitter) direct 3.3V drvive from FPGA. 3 pulse train: 40KHz

:full_moon: *Yellow line:* (Receiver) 200mm distance. ~600us latency:

![alt text](20130613_382959.jpg "Oscillogram")

Observing LONG Reverberation after the end of the signal: >600us