Pin layout: Pin layout of the module board, the UART part has a connector that goes with the included cable, while for the USB part we need to solder the wires to the PCB. Table 1: General specification of the R302 module Module: In the package I got the module itself as well as a cable for connecting to it. Here is a picture of what I received in the package. One more great thing about the modules from the GROW company is that they have the full documentation online free for anyone to use. These modules are the easiest to find around, and they are relatively low cost, with my module coming in around 16 euros, and a couple of weeks waiting time for the shipment to arrive. The fingerprint module I went with is from a company called GROW and the model R302. The good safety thing about these sensors is that 2D images can't fool them, since they are looking for actual ridges on the fingerprint. After that, like with the optical fingerprint sensor, various algorithms are used to process the image. They use a lot of tightly pack capacitors, so when we put are fingertip on the sensor, the ridges on out fingerprint change the charge on some of the capacitors, effectively giving the information about our fingerprint to the device. Optical sensor modules can be found for the Arduino around the internet with libraries and everything.Ĭapacitive fingerprint sensors are the most widely spread fingerprint sensors in the phone industry currently. since they are capturing essentially a 2D image, which can sometimes be fooled with a good picture. One of the main problems of the optical sensor is that most of them can be fooled easily. Of course the better the camera on the sensor the better the image and better the security. The optical sensors rely on pretty much a camera, that takes a detailed photo of the fingertip and using various algorithms scans the image. Optical fingerprint sensors are the oldest off the bunch, and are still used everywhere. I will be covering the first 2, so let's start off with the optical fingerprint sensor. There are 2 main types of fingerprint sensors present today, optical fingerprint sensors, and capacitive fingerprint sensors, there is also a new type that is being developed currently, the ultrasonic fingerprint sensors.
Fingerprints are a unique thing for every person, so they are now used everywhere around us, specially on phones, since the technology allowed them to get so small. Fingerprint sensors, as the name suggests, are used for identifying fingerprints.
0 kommentar(er)
