Troubleshooting A Rotary Switch

Assalamualaikum,

In this week, finally we know how to make a connection of a rotary switch to our circuit.Based on our circuit ,no number of pin given on it,so we have ask our supervisor and other lecturer to find which one the common  and  pin to make connection to our circuit.Firstly,we have to find the common of the rotary switch by multimeter,than we measure every pin and turn the switch to know every value of that pin.The lowest value of ohm at pin its mean the lowest timer to set,the more value add up ,the more time is add up for another pin.For your information we have 6 time interval which is starting from 4 hours until 48 hours.So its mean the lowets value we measure at the pin its starting from 4 hours,to make sure it correct we also refer to datasheet  for more detail on this rotary switch.

Futhermore, we have combine switch 1A and switch 1B into one rotary switch,the connection is related to each other,switch 1B is depend to circuit of  switch 1A.All pin of switch 1A have combine together than connect to pin 5 in IC5 which is 4520.Then for switch 1B combine all the pin together.The movement of switch 1A will make the switch 1B also move and function well.There are two common for this rotary switch ,first common for the first switch and another common we connect to second switch,that how the switch can be connected together.The dash line in the picture above means like i said before just connect it by the common of our rotary switch.

Below is the connection we try to solve it and finally we have done it well.

After that, we make connection directly to our circuit but we not testing yet.The testing result will post another entry.

Below show picture on how we connect the switch 1A and switch 1B .

Explanantion:

The picture above show clearly how the connection of switch 1A and Switch 1B connected together.For switch 1A is the yellow jumper which have 4 jumper out,have 2 common and 2 jumper from all 6 time interval.While black jumper show the switch from 1B,they have 4 jumper which is come from pin 11,12,13 and 14 from ic 4520.

In addition we have,another addition circuit which is using alternative clock.This circuit is to back up if the watch crsytal have problem to produce 2Hz. This circuit directly produce 2Hz just add up transistor 9013 which can make time setting more faster than 4 hours.But we don't have try it,but we think it can be function well.

Alternative clock using IC 555 to produce 2Hz .This circuit we also put in our project if something wrong occur in our first circuit which is came from watch crystal we will using this circuit.By the way, an alternative clock generator circuit is provided, directly oscillating at 2Hz,thus avoiding the use of diver ICs. A CMos 7555 Timer IC generates a stable 2Hz square wave, whose frequency must be accurately set by means of two trimmers. R10 must be adjusted first for coarse tuning, then R11 for fine tuning. Setting precisely the 2Hz frequency of this oscillator is a rather difficult task, and can be done with great patience and the aid of a clock, a chronometer or, best, a digital frequency meter capable of measuring very low frequencies. In any case, after an accurate setup, this oscillator showed a very stable performance, not affected by battery voltage variations and an accuracy of about ±30 seconds per 24 hours interval.