Week 8: Electronics Design¶
Group assignment:¶
- Use the test equipment in your lab to observe the operation of a microcontroller circuit board (as a minimum, you should demonstrate the use of a multimeter and oscilloscope)
- Document your work on the group work page and reflect what you learned on your individual page
Individual assignment:¶
- Use an EDA tool to design a development board to interact and communicate with an embedded microcontroller
Group assignment:¶
- What is a multimeter and what is it for?
The multimeter is also known as a tester, and consists of a portable electrical device that allows measuring the different electrical quantities that are part of a circuit, such as currents, powers, resistances, capacities, etc.
- What is an oscilloscope?
The term oscilloscope is used to name the electronic measuring instrument for the visualization of electrical signals at a given time. These signals are expressed in graphs in which a beam of electrons passes through a coordinate axis on a phosphor screen
Technical specifications¶
- Owon SDS7202 200MHz 1GS/s Deep Memory Digital Storage Oscilloscope, 2+1 Channel with VGA and LAN Interface
- OWON SmartDS SDS7202 Digital Oscilloscope
- Bandwidth: 200 MHz
- Sampling rate: 1 GS/s
- 10m recording length for each channel
- 8 inch 800 x 600 pixel large screen
Individual assignment:¶
- Use an EDA tool to design a development board to interact and communicate with an embedded microcontroller
To create a board we use the Kicad 8.0 software. Once created we will connect with the ESP32 C3 Microcontroller.
STEP 1: We enter the following address to download the kiCad 8.0 software: https://github.com/KiCad/kicad-source-mirror/releases/download/8.0.0/kicad-8.0.0-x86_64.exe
STEP 2: We enter the kiCad 8.0 library in Git Lab and download it in code and then in zip
https://gitlab.fabcloud.org/pub/libraries/electronics/kicad
STEP 3: We open kiCad 8.0 / file / new project
STEP 4: We write the name of our sensor1 project and save it in a folder
STEP 5: We write the name of our sensor1 project and save it in a folder and the following window will appear, then we click on the schematic editor
STEP 6: We click on the symbol editor to add the libraries
STEP 7: We go to file add library
STEP 8: We choose global to add to all other projects.
STEP 9: We select the kicad-master folder and locate the fab.kicad_sym file
STEP 10: We verify that it already pulls the fab folder and we close
STEP 11: We open the schematic editor, we are going to add symbols and then we choose the XIAO-ESP32C3 symbol and click accept
STEP 12: We manage the fingerprint library in the main /preferences/manage fingerprint library
STEP 13: We create the fab folder and look for the Fab.pretty folder to add the libraries
STEP 14: Now if we start designing our card, for which we go to the schematic editor, in adding symbols we go to the fab folder and look for them to have 7 connectors
STEP 15: We verify that it comes out in the following way and the idea is to create the board to connect to the quentorres
STEP 16: We orient ourselves from the image to create our plate
STEP 17: We are going to add power symbols and look for PWR_5V by writing 5V
STEP 18: We locate the 5V with the mouse
STEP 19: We do the same procedure with 3v
STEP 20: We enter the preferred GND of the fab folder, to rotate we select the symbol and press the letter R so that it can rotate and the letter G to move
STEP 21: We click on ESC to exit any tool and then with the mouse pointer we join the tracks
STEP 22: Now we define that we are going to connect a proximity sensor
STEP 23: We now add 4 connectors for which we go to add symbols / the fab folder / and look for the 4 connectors
STEP 24: We mirror the 4-connector symbol
STEP 25: Select the 5v symbol then CTRL + D to duplicate and move and then connect
STEP 26: We add components, a switch and a resistor
STEP 27: We add a 3v and GND
STEP 28: We connect the 3V, the switch and the GND
STEP 29: We enter a 1206 led and duplicate the GND with CTRL + D
STEP 30: When it is joined it looks like this and we join it to pin 7
STEP 31: We click on verify fingerprints and we get that everyone has fingerprints
STEP 32: We update the schematic plate and if we see that there are no errors we update
STEP 33: In the schematic we see the xiao esp 32 and our board that we are working on
STEP 34: We enter Edge Cuts and then draw a graphic polygon
STEP 35: We click on the screen to show 3D viewer and we see that a moving image appears when we move the mouse
STEP 36: To design the width of the tracks we are going to edit defined sizes
STEP 37: The following window appears and in the + sign we add the thicknesses of the tracks, 1.2mm is recommended since current passes through that track
STEP 38: We choose which track to work with in our case with the 1.2mm and then on the route tracks icon
STEP 39: We click on a component and it automatically activates where to connect it
STEP 40:They are left this way
STEP 41: Now we go to mill it, for that we have to go to appearance and we choose to show all the layers without copper
STEP 42: We export in SVG
STEP 43: We choose F.Cu and we already have the file
STEP 44: We change the Switch from 2 pins to 4 pins and follow the same process
STEP 45: Entering the updated switch
STEP 46: Con el cambio del switch termino asi
We now use mods project to be able to print the plate
STEP 1: We enter the url https://modsproject.org/ right click programs
STEP 2: We choose WILL 2D PCB
STEP 3: We enter the SVG file
STEP 4: We open the SRM-20 milling machine software where we calibrate the X, Y, Z axes at their 0 point then click on CUT to load the gcode generated by the MODS
STEP 5: We start the plate milling process
After trying so much with strawberries and srm - 20
