In order to solve the problem that the original pointer type air pump can not automatically fill the standard to stop, multi-mode memory, non-professionals can also know the pressure scale and other pain points, and the birth of digital display portable air pump.

At this stage, portable digital display inflator pump is mainly divided into the following categories,

1. Display: LCD screen, LED lamp beads, digital tube;

2. Charging version, 12V power supply, charging and 12V power supply;

3. Reverse charging function;

4. Emergency start function;

5. Vacuum cleaner function.

The whole part of the digital display pump includes the control chip, the digital display screen and the air pressure sensor (pressure sensor), the air pump assembly.

The cost of the air pump assembly is the most expensive institution of the whole machine, accounting for about 1/3 ratio, and the air pump assembly is particularly critical to the gas index of the air pump.

The most important part of digital display pump function is the pressure sensor. The quality of the project, accuracy indicators, will be affected by the pressure sensor, it can be said that if you want to do a good job of the pump, if the sensor does not understand that will suffer a great loss, believe it or not, you try to know! How many digital inflatable projects have died because of air pressure sensors. Now take you to focus on understanding the pressure sensor in the air pump about the situation. Digital display pump now has two solutions, analog pressure sensor (WF162L) and digital pressure sensor (WF183D). Now more than 80 percent of the market are simulated air pressure sensors, can also be called piezoresistive sensors.

The following focus for you to analyze the difference between the two air pressure sensors, the cost is about what,

1. Analog air pressure sensor, WF162L LGA8 package as an example, cost 1 block, if the accuracy needs to do less than 2%, 24 bit AD that is the first choice, the main control also needs to take differential signal dual AD, also need to take operational amplifier, if you want to save the power management IC, it has to be more than 1 AD, this kind of main control in the market less, And the price is relatively high; There is also a complicated calibration process for simulating air pressure. I have seen the calibration environment of many factories, which is very non-standard and unprofessional. The pressure controller used in the calibration is only an air compressor air pressure gauge, no accuracy at all;

2. The cost of digital pressure sensor is more than twice as high as that of analog sensor, about 3 pieces, because the digital output is IIC communication, you can directly use IO to simulate IIC directly, choose the main control does not need to take AD, pure IO can be, easy to choose the model, the price is cheap, the most key is the digital pressure sensor with temperature output, This function is an indispensable part in the field of inflators. Many inflators are caused by high temperature in the process of inflation, which causes the pressure value to drift, and the controller cannot accurately shut down the air pump. This scheme has another advantage, the user free calibration, no calibration!

To sum up, the numerical control air compressor if you have any requirements, precision digital pressure sensor should be the best solution, in fact two ways according to the BOM and to calculate the production cost, digital pressure sensor is not higher than analog sensor, because now many analog sensor applications, are accomplished by NTC temperature compensation, so have difficulty increasing, It increases the chance of bad things happening.