Wiring
No pin has a fixed job in DroidFX. You wire each part to a free pin, then tell the board which is which, in the setup wizard or on Pin Assignment.
What connects where
Section titled “What connects where”| Part | Wires | Role on Pin Assignment |
|---|---|---|
| S.BUS receiver | Its S.BUS signal wire | SBUS → SBUS RX |
| Sound module | Its RX and TX, crossed over | Audio → TX -> module RX and RX <- module TX |
| PCA9685 servo driver | SDA and SCL | Servo → SDA (I2C data) and SCL (I2C clock) |
| Lights | One pin per light: a plain LED (or a MOSFET driving several), or the data line of a NeoPixel chain | LED → LED 1 to LED 10 |
| WiFi switch | From GPIO1 to GND |
None: it’s always GPIO1 |
The setup wizard suggests a free, safe pin for each part, and lists only pins that can do that job.
Pin Assignment
Section titled “Pin Assignment”The Pin Assignment page draws the board’s two pin headers in their real order. Pick a role, then tap the pin it’s wired to.
- LED pins apply as soon as you save, NeoPixel ones included.
- S.BUS, audio and servo pins take effect at start-up: save, then restart before testing.
Pins to avoid
Section titled “Pins to avoid”GPIO1is reserved for the WiFi switch and can’t take any other role.GPIO46is input-only and can’t drive anything.GPIO0is the BOOT button, and doubles as the WiFi override: anything wired to it that pulls it low just after start-up turns WiFi on.- These work but are flagged as risky:
GPIO0,GPIO3andGPIO45(they decide how the chip starts),GPIO43/GPIO44(the USB serial console, which you lose), andGPIO19/GPIO20(native USB).
The WiFi switch
Section titled “The WiFi switch”Wire a switch from GPIO1 to GND. Open (the default) means WiFi stays off; closed means WiFi starts. It’s read once, at power-up, so flipping it while you’re connected won’t cut you off. No switch yet? Power up, then hold BOOT for 3 seconds. See System, WiFi & password.
Check it
Section titled “Check it”Once the receiver is wired and its pin set (and the board restarted), open R/C Monitor and move a stick: one bar should follow it. If nothing moves, see Troubleshooting.