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According to some studies, mosquitoes are removed by ultrasound in the 38-44 kHz range. The sensor for Arduino HC-SR04 contains a 40 kHz ultrasound generator. So why not use it as a cheap mosquito repellent? Maybe it may not work, but it costs almost nothing to try!
According to some studies, mosquitoes are removed by ultrasound in the 38-44 kHz range. The sensor for Arduino HC-SR04 contains a 40 kHz ultrasound generator. So why not use it as a cheap mosquito repellent? Maybe it may not work, but it costs almost nothing to try!
The operation of the HC-SR04 can be read in the datasheet cdn.sparkfun.com/...datasheet.pdf. For the control of the sensor a Digispark is used, because it's an economic board with more than enough performance for the purpose. From the following links you can find more information about the Digispark:
The operation of the HC-SR04 can be read in the datasheet cdn.sparkfun.com/...datasheet.pdf. For the control of the sensor a Digispark is used, because it's an economic board with more than enough performance for the purpose. From the following links you can find more information about the Digispark:
home page of the official guide digistump.com/wiki/digispark;
differences from the Arduino and limitations digistump.com/wiki/...basics;
The sketch, downloadable from the link http://bit.ly/2kwMCb9, was written based on previous notions. The HC-SR04 is connected to the Digispark as follows:
The sketch, downloadable from the link http://bit.ly/2kwMCb9, was written based on previous notions. The HC-SR04 is connected to the Digispark as follows:
Once the board has been programmed, to check if everything is ok, just put an object in front of the sensor and notice if the on-board LED (controlled by the Echo pin) of the Digispark flashes as in the following video: this means that the HC-SR04 is generating ultrasounds and receiving those bounced back from the object.
Once the board has been programmed, to check if everything is ok, just put an object in front of the sensor and notice if the on-board LED (controlled by the Echo pin) of the Digispark flashes as in the following video: this means that the HC-SR04 is generating ultrasounds and receiving those bounced back from the object.
If the test is positive and we don't want the flashing LED, we can safely disconnect the Echo pin, because we aren't interested in the distance measured by the HC-SR04.
If the test is positive and we don't want the flashing LED, we can safely disconnect the Echo pin, because we aren't interested in the distance measured by the HC-SR04.
The project considers the Digispark powered by a USB port. It's also possible to use an external DC power supply between 7 and 12 V; it's sufficient to connect the latter's Vcc and GND terminals to the VIN and GND pins of the board respectively.
The project considers the Digispark powered by a USB port. It's also possible to use an external DC power supply between 7 and 12 V; it's sufficient to connect the latter's Vcc and GND terminals to the VIN and GND pins of the board respectively.
If we have more HC-SR04, we can connect them in parallel, perhaps oriented in different directions; each one absorbs 15 mA and from the 5V pin of the Digispark it's advisable not to take more than 150 mA: it's better not to connect more than 10 sensors together to avoid overheating problems.
If we have more HC-SR04, we can connect them in parallel, perhaps oriented in different directions; each one absorbs 15 mA and from the 5V pin of the Digispark it's advisable not to take more than 150 mA: it's better not to connect more than 10 sensors together to avoid overheating problems.
At this point we just have to wait until next summer to test the effectiveness of our ultrasonic mosquito repellent!
At this point we just have to wait until next summer to test the effectiveness of our ultrasonic mosquito repellent!
Note:
Note:
1) The software is provided "as is" without warranty of any kind; I take no responsibility for the consequences deriving from the use of the information contained on this page.
1) The software is provided "as is" without warranty of any kind; I take no responsibility for the consequences deriving from the use of the information contained on this page.
2) Ultrasound can cause damage to health (see for example www.ospedalesicuro.eu/...fdr_ultr.html); find out about how to prevent them before using the device. I take no responsibility for it.
2) Ultrasound can cause damage to health (see for example www.ospedalesicuro.eu/...fdr_ultr.html); find out about how to prevent them before using the device. I take no responsibility for it.
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