U-Nozzle and U-Box
The ultrasonic attachment is placed on the end of a white cane. The keychain can be placed around the neck or in the hand and can be used as a flash light.
The algorithm of work of these devices is based on a reflection of ultrasonic waves from an obstacle. The distance to an obstacle is measured by calculating the time difference between the moment of generation of the impulse and the moment of receiving the reflected echo signal.
See below for a schematic circuit diagram of the developed device:
All of the components used in assembling apart from the 3D printed body of the white cane attachment were purchased via AliExpress:
- Ultrasonic transducer HC-SR04.
- Control board Adruino Pro Mini.
- Battery 3.7 V 300 mAh.
- Voltage transducer 0.9V ~ 5V to 5V 600 mA.
- Charger module AC/DC 220V to 5 V 1 A.
- Charger LA-520W.
- Indicator: mobile phone vibro- motor 4x10mm DC 3V.
- Button PB-22E60.
- Body Gainta G1906 (for the keychain)
- Transistor: bss138 or bcr108.
Exterior appearance and cost (including a standard delivery fee from China) of the components we used in assembling the ultrasonic white cane attachment are as follows:
The most costly component of the assembling is the 3D printed body.
Exterior appearance and cost (including a standard delivery fee from China) of components we used in assembling the ultrasonic keychain are as follows:
Our developed devices have the following specifications:
|Distance range of detecting obstacles||1,5 meter|
|Approximate running time on a single charge||8 hours|
|Vibration levels||3 (1,5 m/0,7 m/0,5 m)|
|Type of charger||mini usb|
Exterior appearance of the ultrasonic white cane attachment:
Exterior appearance of the key chain placed around the neck:
3D-model and sources for Adruino download link.
The software is released under GPL.
The Hardware project is released under the Creative Commons Attribution-Share Alike 3.0 United States License.
Read more about project history link.