In certain projects, it might not be practical to include push-buttons for inputs. The constraints might be spatial or related to parts cost. In these cases, a capacitive touch sensor IC can turn an exposed PCB surface into a push-button that is activated upon touch.
A load cell is a device that is used to measure force. In response to an applied force, it produces an electrical signal on the output. One of the most common types of load cell is the strain gauge, which is used to measure weight.
The BNO055 is a System in Package (SiP), integrating a triaxial 14-bit accelerometer, a triaxial 16-bit gyroscope with a range of ±2000 degrees per second, a triaxial geomagnetic sensor, and a 32-bit Cortex M0+ Microcontroller running Bosch Sens
The PIR sensor stands for Passive Infrared sensor. It is a low cost sensor which can detect the presence of Human beings or animals. This HC-SR501 PIR sensor module has three output pins Vcc, Output and Ground as shown in the pin diagram above.