This project is my self research in my undergraduate school.
I believe this is the first smart lock pin which can automatically detect the weight you select on the fitness equipment like seated row machine, Chest press machine and so on.
The blue one is the lock pin. I made a smart one to replace it to automatically detect the weight and the movements.
Figure 1: the sensor design draft
Figure 2: the sensor renderings
I used SLA to print the case.
Figure 3: the sensor case
Figure 4: the inside structure of the structure
I used AltiumDesigner 14 to designed the infrared sensor board according to the sensor datasheet and make it to a printed circuit board.
Figure 5: the infrared sensor schematic
I designed the power system. I used a Li-ion battery as the main power supply and I converted it to 3.3v for both sensor and MCU.
Figure 6: the power system schematic
Figure 7: the circuit system (from left to right: infrared sensor; powersystem & microcontrolloer(CC2541 TI); lithum battery)
Figure 8: put these in the 3D printing case
I made a poster prensentation in ISIPS 2016.
Figure 9: poster presentation in ISIPS 2016
I had a invention patent for this project.