Dettol no touch soap dispenser ~ ques ~

hi all,

im new in circuit - trying to understand how does the circuit in this dettol no touch soap dispenser works.

i've currently dismantled the parts looking at the circuit but still new

anyone can help to explain how does the circuit works

from what i see there are:-

1) 1 yellow + 1 green wires connecting to the sensor
2) 1 brown + 1 white wire connecting to left side of the pump
3) 2 yellow to the top side of the pump
4) 2 green to the right side of the pump
5) 1 red + 1 black to the battery

All this wires are soldered on a circuit block

Would greatly appreciate if someone can help me out in the basic understanding how this pump works in terms of electronics

Thanks all !

 

hi there, thank you much for ur fast response.

below are the images

 

hi dave ~ below are more pictures

 

hi dave, i hope this will sufficient.
thanks again for looking at this

 

hi steve - thanks for the reply


i would think its pretty clear cut that red & black is for the battery and orange/green is for the infra red sensor. pls correct me if im wrong

i have a few questions:-
what are the purpose of the wires below :-
2) 1 brown + 1 white wire connecting to left side of the pump
3) 2 yellow to the top side of the pump
4) 2 green to the right side of the pump

what does the diff wires on the pump play a role for? thanks

btw. i don't plan to put them back together anymore. It's more like a guinea pig to be tear apart

 

hi dave, another question - doest this system uses a infra red proximity sensor
why is there a need for a photo-diode ?

photo diode converts light to current/voltage right ? what role does it play in this circuit

 

hi dave. tbh i have no idea whats that thing

this is another clearer pic. hope this helps

btw dave, do u know what does all the diff wires attach to the pump does

 

im still confused

so this thing here uses a photo diode or infra red sensor ?

 

can someone tell me whats that in the previous 2 pic?

how does this thing detect movement ?