Date: 17-09-2018
Day: Monday (Week 9)
Venue: Apartment UniKL BMI

Finally, the second circuit is really good function. I have solve the problem with change the resistors to make the servo is move efficiency. The real circuit in youtube source has using the Mega ohm resistor for R3. So, i change to reduce the third colour band of resistor R3 to get smooth movement for servo. Furthermore, i also change the resistor R1, R2 colour band and added one resistor to switch S2. Then, the limit switch will be added connected after S1 and connected to the ground.

The flow of circuit for limit switch is when the S1 is pushed, the current will flow to the LM555 and the same time limit switch is Normally Close condition. Then, when the limit switch trigger in Normolly Open, the current from ground will block through the S1 and the same time when push the S1 cant through current to LM555. 

In above show the completed circuit has been finished. I use the arduino 101 for give a supply Vin in 12V. Actually, in data sheet for servo can support 3V-6V only. But, i dont have a 6V voltage adapter and forced to be used a 12V adapter. 

Date: 9-09-2018
Day: Sunday (Week 8)
Venue: Apartment UniKL BMI

Last week, i create the second circuit to open and close the front door of Smart Mailbox using a arduino software. So, i found the circuit that did not using a arduino software. This circuit have using two push button, resistors, diode, capacitors, servo motor and LM555. finally i got a good result where the circuit i really good function.

For the first impression i want to make sure the the servo is function when both of button is pressed. Actually, i use the recyle components and already have one servo motor SG90 tower. So, i need to use it because want to save the budget. Furthermore, that also not a serious problem when i not use a real component like a photo. The servo and button can function but not really compatable with the voltage or resistance. So,i need to think harder how to modify and make it happen. 

Date: 27-08-2018
Day: Monday (Week 7)
Venue: Apartment UniKL BMI


After finish created the Smart Mailbox casing, i want to create other circuit to open and close for customer or postman. Actually this system easily to customer or postman where sending their item into the Smart Mailbox. Furthermore, this system also want to prevent the item from stolen or loss from the other people. 

This photos is simple circuit where using the arduino coding to trigger the buttons as a input. The green button show as limit switch sensor. That sensor i was create to trigger the open button where the open button cannot function when the sensor is ON. But, the circuit not function because have a problem with the arduino coding. So, i need to find another ways to make it really finction.