On Tuesday, I check again the PCB and clean it a little. I found that some capacitors disappear during my cleaning, and I change the scheme a little. Because of the system of copy-paste of mentor and the way we put the decoupling capacitors, they are not linked with the same components. So I need to put again the capacitor near the component to check if I have all the capacitors I need.
Now, we receive the PCB, so we can begin the tests on it and I need to check with some documents Alexis give that all is ok with the HAL
On Friday, I work on reducing the final PCB from 16×16 to 14×14. I have discovered two new things: to delete some route, you can use the tool “add partially selected nets”. You will gain some time until you realise that you delete all the GND and VCC nets… By chance, after spending one-hour routing again theses nets, thinking that you would have gained more time by going back in your git, you can use the command fanout that will route again these nets easily. So, the PCB is almost finished, I just need to adjust the board outline and we can concentrate on the code and the test PCB that may arrive one day.… Read more
We previously tested a Hall effect sensor that, was working, but which gave us a voltage from which we could get the marble’s side. The issue with this is that in the final box, with all the marbles and the coils, we could have had strong pertubations that could alter the data. To avoid this issue we decided to use a sensor that would send the data through a communication protocol that could resist. We chose the TLE493DW2B6A0HTSA1 Infineon Technologies. This sensor sends its data through the I2C protocol so it should resist to our perturbations.
Let’s connect it !… Read more
In the components familly, it was time for the Hall effect sensors to be tested.
We used the SS39ET from HonneyWell. This sensor has 3 pins. One is GND, one is Vcc and the last is the output. The output is a voltage proportional to the magnetic field. We choose for Vcc a value of 3.3V.
First tests, let’s use a voltmeter.
To do the first tests we measure the output voltage with a voltmeter. To power the device we used a DC power supply. We also added an ampermeter to measure the current going to the Hall effect sensor.… Read more