Designing an RF remote controlled lightswitch with dimmer

[axero]

Objective
I want to design a 5 or 6 channel light switch with the capability of taking a load of at least 500W per channel where at least two of these channels are dimmable. An ideal configuration would have one remote control and two receivers.

Research background
A week ago I reverse engineered such a circuit in order to troubleshoot the power supply side. The thread about this is found here:

https://www.eevblog.com/forum/beginners/diagnosing-a-rectifier-circuit/

I also took some pictures of the PCB of the device. It consists of a mainboard and some kind of a daughterboard. The mainboard contains the PSU, some relay circuitry and the CPU (which I have no clue what it is. The daughterboard (RF receiver module) contains the receiver circuit coupled with some kind of antenna (a white cable).
The main board



These are images 1,2 and 3 from top to bottom...

The receiver module



These are images 4,5 and 6 from top to bottom...

The transmitter module


These are images 7 and 8 from top to bottom...
The 'main chip' (DIL18) of the transmitter module is a W0369DGP0103 circuit.

The trouble that I have is to identify the 14-pin DIL chip on the mainboard that is right underneath the RF receiver module that assumedly is the CPU or control logic circuit.

The label side of it is completely blank, all I know is that $+V_{cc}$ (+5V) is fed into pin 4 and $-V_{cc}$ or GND is on pin 11. Some kind of reference voltage of ~2.5V seems to be fed into pin 2. The circuit has 4 channels for controlling light sources located on pins 1, 12, 13 and 14 where three of them toggles LEDs (CH2-CH4; all three are paired, i.e. one button push on the remote turns them all on or all off) and one toggles a mechanical relay. The signal from the RF receiver module goes into pin 8.

The SMD8 chip on the receiver module (daughterboard) is a 358 from STMicroelectronics and the module is fed with a 5V voltage.

Any ideas as to what kind of a chip that is would be appreciated, I hope it is not an ASIC.
That a partly dimmable 6-channel RF module is achievable and not that expensive to build is not so hard to realize when searching through ebay. I got the following hits there:

eBay search query for RF light switches

http://www.ebay.com/sch/i.html?_odkw=technics&_osacat=0&_from=R40&_trksid=p2045573.m570.l1313.TR0.TRC0.Xrf+controlled+light+switch&_nkw=rf+controlled+light+switch&_sacat=0

"Plain vanilla" 4 and 6 channel 12V switches

http://www.ebay.com/itm/12V-Four-4-Channel-Way-RF-Remote-Control-Switch-for-Light-/151097760649?pt=Home_Automation_Controls_Touchscreens&hash=item232e20db89

http://www.ebay.com/itm/12V-6-Channel-Way-RF-Remote-Control-Switch-for-Light-/260739698681?pt=Home_Automation_Controls_Touchscreens&hash=item3cb54c0ff9

3-way 240V switch

http://www.ebay.com/itm/AC-220-240V-3-Way-RF-Light-Wall-Control-Switch-Digital-Smart-Remote-Controller-/310827949461?pt=Home_Automation_Modules&hash=item485eca1d95


1 channel dimmable control:

300W
http://www.ebay.com/itm/300W-30M-RF-Remote-Control-Switch-For-Lights-AC200-240V-Dimmable-F-Incandescent-/320919118567?pt=Home_Automation_Controls_Touchscreens&hash=item4ab84522e7

2000W
http://www.ebay.com/itm/AU-Standard-Light-Touch-Screen-Wall-Dimmer-Switches-1Gang-1Way-RF-Remote-Control-/271344897906?pt=AU_Building_Materials&hash=item3f2d6a8f72


One remote control 2 receivers totalling 4 channels

http://www.ebay.com/itm/12V-4-Channel-RF-Control-Switch-Relay-Output-2-receivers-2-remotes-for-light-/261046507671?pt=Home_Automation_Controls_Touchscreens&hash=item3cc7959897

Any suggestions?

note that the "$" or "$$" brackets are for typesetting the math inside with mathjax (www.mathjax.org)

[Lurch]

Your images aren't exactly where you say they are.

(note that the "$$" brackets are for typesetting the math inside with mathjax

Yeah, that doesn't work.

[axero]

That's strange because the images show up just fine on my computer. I have now changed image hosting website to imageshack.us hopefully it works better now.

If mathjax typesetting doesn't work, that's nothing I can do about unfortunately. The site admin either needs to add a few mathjax lines into the web page or end users can add these lines with a greasemonkey script.