The sensor uses the Panto technology PMS7003M. In addition to Climbing Technology, there are several such sensors that should be good, but I have not used it and have not studied it. (The reason why I used this is because I saw a post on newsmth, someone used it.) After the sensor was bought, I actually regret it, because I found that there is still a pm2.5, formaldehyde, temperature and humidity. Three-in-one sensor PMS5003ST. Together, these functions can be used to perform complete air quality monitoring.
Below is a photo of the PMS7003M.
The interface of this sensor is very small, the connection is very hard, so I also bought a special test adapter board. Below is the photo.
With these two, you will need a USB to TTL adapter cable. There are a lot of Taobao, just pick one, and cost more than ten yuan. It is necessary to pay attention to the chip used in the USB to TTL adapter line. It is said that the quality of the FT232 is the best and the most expensive. I was out of stock when I bought it, and I only bought a few of them using the PL2303 chip. There is no problem with it.
Of course, you have to connect 4 wires, 5V, GND, TXD, RXD. It should be noted that the TXD of the sensor should be connected to the RXD of the patch cord, and the RXD of the sensor should be connected to the TXD of the patch cord.
Nowadays, users buying a new type of Bluetooth Speaker are not only based on functional considerations to meet product requirements, but their biggest purchase motivation, their inner psychological appeal and emotional resonance are one of the motives.
What are the characteristics/attributes of Bluetooth speakers?
1. Mini appearance, light and portable;
2. Bluetooth pairing makes listening to music more convenient;
3. Freely switch to answer mobile phone calls;
4. Long press the volume key to adjust the size;
5. Stereo sound, sensory experience;
6. Support TF card, and insert AUX audio music insert function, compatible with a variety of music formats, listen to the music you want at any time.
7.We also use waterproof material to make it, and the waterproof grade reaches IPX4, which can prevent rain or domestic water from splashing on the speaker. When using it, remember to close the charging rubber plug.
No matter how you listen to the music in your mobile phone, it seems like you are rewinding. The Bluetooth speaker restores the concert scene for you. If you are tired of listening to the same old tune of the music APP, it is better to feel the scene of the Vienna Concert Hall at home.
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