350.MP4
Traditional Sanwa buttons used in arcade use micro switches which wear out through time. This project creates a optical sensor module that can replace the whole original lamp/switch holder and the microswitch. It almost never wears out.
I build it originally for my Pop'n Music controller, the Sanwa OBSA-100UMP button. And it turned out Sanwa has its own standard and my design works for many other Sanwa buttons such as SDVX and IIDX.
The PCB contains the optical sensor part and the LED lamp part, you need to cut the lamp part from the main board.
For the optical sensor, the PCB supports both ITR1203 (small) and the ITR8402 (big) but I would only suggest to use the ITR1203, small and perfect.
- R1 is the current limiter for the emitter, 1206, 500ohm to 1K is fine.
- R2 is for pulling down the out level, 1206 or 0805, 10K is fine.
- R3 is the current limiter for the LED lamp, depending on the brightness of the LED, 1206, 50ohm to 200ohm is fine.
- For the LED, choose 2835 or 3528 3V high brightness LEDs.
You need to print out the holder.stl. A resin printer is perfect for this. I'm not sure if an FDM printer with PLA has enough accuracy to do the work.
- Solder the lamp part onto the main board.
- Use M1.8*8 screws to fix the board onto the holder.
- Remove old lamp/switch holder from the button.
- Push this new optical sensor back into the button.
The interface to the mainboard is a ZHR-5, which is compatible with Sanwa's own buttons with optical sensors. I haven't made other types of interfaces yet. Maybe I will in the future.
- Good Luck! *