First, the place where the ultrasonic emission part should pay attention 1. First make sure that the frequency of the ultrasonic wave you are emitting is the standard 40KHz (duty cycle 50%) and that there is enough driving voltage. 2. If you are driving an open non-waterproof probe (that is, an aluminum casing with a metal mesh on the surface of the probe, you can see that there is a tapered metal inside), then use the inverter in series and then parallel to do BTL push ( Short distance ranging, voltage above 10vpp can be). 3. If the probe used is a fully enclosed waterproof head, then it must have sufficient driving voltage to drive the probe (at least 60vpp or more, you must use the mid-cycle transformer for the reversing radar, this device can find the inductor manufacturer) , has been mass-produced devices, so it is easy to buy. Note that the number of turns can be, generally there are several ratios of 1:10, 1:7, can be used). Second, the resistance of pin 5 of CX20106A determines the center frequency of reception, and the resistance of 200k determines the center frequency of reception is 40KHz. Advantages and disadvantages of using the CX20106A: Advantages: Easy to use, simple circuit, reducing the trouble of production debugging. Disadvantages: It must be guaranteed that the received signal is 40KHz, otherwise it cannot be demodulated. Third, the application of ultrasound on the schematic website has a lot of information can be referenced, please use the search function to find it yourself. The following is a typical circuit using the CX20106A as an ultrasonic receiving process for reference. (When the CX20106A receives a 40KHz signal, it will generate a low-level falling pulse on the 7th pin. This signal can be connected to the external interrupt pin of the microcontroller as the interrupt signal input). UK Multifunctional Adapter Plug Uk Adapter Plug,Power Plug Uk,Uk Charger Plug,Uk Multifunctional Adapter Plug Wenzhou Niuniu Electric Co., Ltd. , https://www.anmuxisocket.com