fp electronics

docs/projects/final-project-c- electronics.md

@@ -533,15 +533,18 @@ For 12V, 6V, 5V, I converted 100V to 12V using a AC-DC converter, and converted
 
 ### **100V terminal block**
 
-I used a terminal block so 1 plug going into 100V can provide voltage to multiple devices.
+I used a terminal block so the whole system's electricity can be provided with 1 plug into 100V.
 
 
+![](../images/fp/fp-46.png)
 
 To make cables to connect to terminal block, I stripped around 7mm of a cable, twisted the wire inside, put the head on, and used caulking machine to fix the head onto the wire.
 
 ![](../images/fp/fp-42.png)
 
+It ended up like this.
 
+![](../images/fp/fp-47.png)
 
 ### **12V converter**
 
@@ -579,6 +582,34 @@ I used ATmega 328 for my MCU, and I remade [Satshakit](https://github.com/satsha
 Pin layout:
 
 
+![](../images/fp/fp-48.png)
+
+
+A0 - 3 tact switches for the Tower Heating Temperature set up
+
+A1 - 3 tact switches for the Outlet Timespan set up
+
+A2 - 1 tact switch for Salt production
+
+A3 - thermistor
+
+A4, A5 - vacant
+
+D0, D1 - reserved for Tx Rx
+
+D2, D3 - SSR1, SSR2
+
+D4 - vacant
+
+D5, D6, D7 - Row of LED matrix
+
+D8, D9, D10, D11 - Column of LED matrix
+
+D12 - DC motor
+
+D13 - solenoid valve
+
+
 
 
 Since I will put my MCU in the control panel which is fairly big, I decided to make a larger MCU. 
@@ -589,7 +620,35 @@ I also drilled several holes that serve as jumper for VCC and GND on the board.
 
 ### **EAGLE**
 
-I opened "satshakit cnc schematic" file on EAGLE.
+I opened "satshakit cnc schematic" file on EAGLE. To keep the pretty layout of satshakit, I edited one pin in Schematic, laid out the parts in Board, and then proceeded to the next pin in Schematic.
+
+At the beginning, I edited everything in Schematic, then tried to lay out parts in Board. The previous pretty layout was already a mess at that time.
+
+This is the Schematic of the MCU.
+
+
+Left half:
+
+I added the parts to retain 5V from 12V onto the MCU.
+
+I added holes as jumper for VCC and GND so that it's easier to lay out parts.
+
+There were many pairs of VCC and GND to supply power for LED, SSR, etc.
+
+![](../images/fp/fp-49.png)
+
+Right half:
+
+![](../images/fp/fp-50.png)
+
+
+This is board of the MCU.
+
+![](../images/fp/fp-51.png)
+
+The 4 holes on the edges are to fix the MCU onto the control panel with screws. So the diameters are 3.2mm.
+
+To prevent short-circuit caused by the screws, I made sure that no pattern is within the circle with a diameter of 7mm from the screws.