On Tuesday we met with Navid and Cristian to present a dry run for our second prototype. The following were the advice given and issues discussed by them :

– Have all the presentation slides numbered.

– Pronounce the word ” Centimeter” instead of Cm – need to be consistent with the terms.

– Further elaborate and clarify the power regulator in the slides.

– PCB design: found problems with the connectors.

On Thursday we started to calibrate our weigh scale using a wheelchair we got from the wheelchair rental company. We took a number of readings and plotted a graph in Excel to obtain the equation needed for the weigh scale. We tried different types of graphs to fit all the data points. Since the upper layer is not bolted, a small layer of metal piece was used to fit in the hollow space between the load cell and upper platform for better measurements.

On Saturday we met up and worked on the calibration of the load cell using the wheelchair from the Biomed lab . Since it is a different wheelchair (different weight and placement of the wheels ),  we used previous equations from the wheelchair we rented to test it on the  Biomed lab wheelchair. There is a need for recalibration. Apart from that, we finalized the presentation slides and WengFei and Michael practiced the presentation.