Hardware Mods
A speaker can be attached to the Gotek to sound whenever the floppy drive heads are stepped. A piezo sounder can be connected directly between jumper JB and Ground, marked respectively as SPEAKER and GND in the picture below.
If you want to connect a magnetic speaker instead, you must buffer via an NPN transistor. If you don't know what this means just be sure to use a piezo sounder, easily found on Ebay, and connect it directly as shown above.
FlashFloppy supports a third button in addition to the basic up/down controls. This should be a standard momentary microswitch, connected to the header pins JA.
The button's effect depends on the current state of operation:
- When an image is loaded, the button will immediately eject it
- When selecting an image, the button will immediately confirm the currently-selected image
As an alternative to the Gotek 7-segment display, FlashFloppy supports the ubiquitous 1602 LCD with I2C backpack board. These are available from many Ebay sellers. The connections should be made just as for HxC Gotek firmware, including pullup resistors (if required - see below).
You can locate SCL, SDA, and GND on your Gotek PCB as below. These connect to the corresponding header pins on your LCD I2C backpack module.
VCC (aka 5V) can be found in various places, including just behind the floppy power connector.
The SCL and SDA lines must be connected to VCC ("pulled up" to VCC) via 4.7k resistors. Note that many I2C boards have the pullup resistors on board and in this case you do not need to attach your own external pullups. You can confirm this by checking the resistance between SDA/SCL and VCC. If it is less than 10k you do not need to add pullups.
If you do require the pullup resistors, these can be soldered to the backside of the Gotek PCB between VCC and each of SDA and SCL. Alternatively can be soldered to the back of the I2C module header as below.
Another alternative to the Gotek 7-segment display is a 0.91" 128x32 display, as sold for Arduino projects by many Ebay sellers. You will require a display with I2C interface: you should see it has a 4-pin header marked GND, VCC, SCL, SDA.
These displays can simply connect to the 7-segment display's header, reusing the existing jumper wires, as in the pictires below.
As an alternative to using the up/down buttons you can instead connect a rotary encoder. The picture below shows how to connect it, either directly or via a PCB module (eg KY040).
If connecting directly note that by convention GND is always the middle pin in the row of three. If there is a further row of two pins then these are connected to an internal push switch: you can wire these pins to jumper JA to use the switch as an eject/select button.
Rotating the dial should now have the same effect as pushing the buttons: anti-clockwise for down, and clockwise for up.
Troubleshooting:
- Directional controls are inverted: swap the A and B (aka CLK, DT) wires.
- PCB modules only: Both directions move up (or down):
- Connect + to 3.3V (marked in picture above); or
- Remove pull-up resistors from the back of the PCB; or
- Remove the encoder from the PCB and solder wires directly.