docs output devices. group assignment individual assignment

docs/Assignments/week_10_output_devices/lecture_notes.md

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+# Lecture notes
+
+## Global
+
+### Mosfet
+Resistor between mosfet gate and drain to pull high or low to disable the transistor until the mcu is programmed/ready
+
+## Local 
+BJT - Bipolar junction transistor
+
+Back of Diode - Anode
+![alt text](image.png)
+
+
+Front of Diode - Cathode
+![alt text](image-1.png)
+
+
+
+
+### Solenoid
+
+Coil of copper wire that creates a magnetic field. Can be used as a switch or a actuator.
+
+Example: Locking mechanism in doors.
+
+When they are open they generate lot's of heat.
+
+### Piezo
+Crystalline wafer tat deforms when voltage is applied
+
+Can also be used as a knock sensor. Will return voltage when vibrated
+
+### Motors
+Motors are unpolarized 
+You can change the polarization to change the direction of the motion
+The more voltage the higher the speed
+
+#### Servo
+DC motor + gearbox + sensor = position control
+
+#### Stepper motor
+Static magnet + varying electromagnets at all angles = precision motion (steps)
+![alt text](image-2.png)
+
+![alt text](image-3.png)
+(Thanks Erwin for the slides)
+
+Stepper motors have their own controllers. Mostly controlled via Serial.