Articles tagged with “pcb design”

Recently I have received the new batch of PCBs for my URU Card [/2020/06/29/uru-card-arduino-fido2-authenticator/] device. Since I do not have a 3D printer and appropriate skills I am going to construct a hard shell using the stack of PCBs. This time I have chosen black colour for the boards as it comes in a nice matt finish.

MPR121 is a Proximity Capacitive Touch Sensor Controller developed by the company NXP. Being only 3x3 millimeters in size this chip allows us to connect up to 12 touch sensors. The communication protocol is I2C. This makes it an ideal candidate for the user keyboard in the URU Card [/tag/uru-card/] project.