Day 22

Topics

• Scanning I2C Devices
• Intro to C++

Scanning I2C devices

   The project could involve multiple I2C devies so it ain't no good to have the same adress for them. I setup the devices I would be using. Then, I started scanning. First was the EEProm. 

  Next I scanned the load sensor. It wasn't an I2C device because nothing showed up. Moving onto the IMU board and I found two addresses for this device. 

   I will have to also scan the SD card because I believe that follows the same I2C routine. 

   I looked it up. SD cards use a different routine, SPI. This is good. I shouldn't have any any conflict between the devices I will use.

EEProm: 0x50
IMU : 0x68; 0x76



Introduction to C++

   The first modification was to watch the keyboard and wait for inputs.  I made, what I consider, a simple solution. What I got back was a cascade of errors.

   Because they looked to be something other than a syntax error, I tried running the running the program on two different online compilers. These gave me even more errors. Even when I ran the program right of the book. first image is Jdoodle; second is C++shell. 

   I changed one thing, the "int' declaration of the "i" in my for loop and most of the errors were resolved. Not sure why.













   I tried doing the same thing with a while loop. This gave more errors than the for loop.

   I used the program introduced in class today; that allowed me to do what needed doing. I ended up doing two ways to input the values because my original cin had an endl at the end and I didn't realize that was the problem. Pointers work just fine here. I tested what I had by putting in the original values. 

   Then I was to put the known values  into a file and read them out. I was getting weird values and then I decided to print out the values because I wasn't getting the right values.

   I was able to figure out the problem. I left out some brackets and as well as not having the correct value for ending the for loop.

  Next, I was to compute the minimum distance between the hands. I made a new function to call at the end. I had to change some values in order for the function to work because two of the numbers were the same. 

   I then had to get the function to print out which location had the know distance. I did this by adding one more variable that was changed whenever the minimum distance if loop runs.

   The next part was the find multiple instances of the same min value. I used the same structure while and compared those values to the min value I find before hand. Then I simple scroll through the values and array and find what I need.