Prototyping the optocoupler on the KlikAanKlikUit remote control
PC817 serves as a switch parallel to the original switch. The 470 ohm resistor allows operation off a 5V power supply.
Prototyping the placement of 4 PC817s on the remote. It seems there is enough space to place them.
It might require a bit of squeezing to get all of them in
Prestine condition of the soldering side of the remote controller PCB
left to right: PCB, top shell and bottom shell of the remote control
Superglue is your friend when it comes to holding the PC817s in place.
All well that is stuck well
All PC817s received their own resistor. A piece of PCB is glued on a free area of the remote control.
Wirewrap wire is used to connect the diodes in a matrix-like fashion.
First the gnd leads of the 'on' column receive their leads (3rd lane from the top), then the + leads of row 2 get connected (1st lane from the top)
A leg of the PC817 came off and had to be mended, which can clearly be seen on the upper-left
The gnd of right hand column ('off') are wired to the 4th lane
The + leads of row 1 get connected to the 2nd lane.
All shrinkwrap protection is shrunk and the remote is verified to still operate properly.
To wire the remote to the Soft-I/O module, four lift-type terminals are superglued to the casing. As it appears, superglue also locks screws into place. Better use some kit next time. A tiny hole is drilled that accomodates the four leads.
Four wirewrap wires looped through the tiny hole. Note the color coding (on and off, 1 or 2 marks)
The wires are routed to the four-lane PCB glued onto the remote
All together now...
...snap shut.
A final test of the unit verifies that it still operates properly using the buttons. The Soft-I/O module can now operate the buttons by pulling one side of the LED HIGH, and pulling the other side LOW. A current will flow through the LED, the optocoupler will conduct and will make the transmitter think a button is pressed.