Glossary
Plain-language definitions for the hardware, firmware, networking and flight terms used in the ESPFlight beginner path.
ESPFlight Docs · v1 • Validated v1 documentation path
# ESPFlight v1 terms
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| Term | Meaning |
|---|---|
APK | Android application package file used to distribute ESPFlight Application v1.0.0. |
ARM | Explicit firmware state that allows the controller to enter the ready/flight-control path when safety conditions are satisfied. |
BOM | Bill of Materials; the component list for a PCB/release. The PCB BOM is not automatically a complete Drone parts list. |
CCW | Counter-clockwise rotation. |
CW | Clockwise rotation. |
DISARM | Explicit safe state that resets assist/PID state and forces motor PWM to zero. |
Failsafe | Firmware response when required control or safety conditions are lost. |
Gerber | Manufacturing files used by a PCB fabrication service to produce board layers/drill data. |
GPIO | General-purpose input/output pin number used by the ESP8266 firmware to connect motors, LED, buzzer and other signals. |
Head Lock | Heading-relative control feature supported by the v1 platform. |
I2C | Two-wire digital bus used by the v1 reference for the MPU-6050 and optional VL53L0X. |
IMU | Inertial Measurement Unit; the MPU-6050 is the v1 reference IMU module. |
PCB | Printed Circuit Board. |
Pick-and-Place | Placement file used by automated PCB assembly services to position components. |
PID | Proportional–Integral–Derivative feedback control used for stabilization/tuning. |
Protocol 2 | The v1 application/firmware communication protocol version. |
PWM | Pulse-width modulation; the v1 firmware uses PWM for motor-output control. |
RSSI | Received Signal Strength Indicator; Wi-Fi signal level reported in dBm. |
Schematic | Electrical circuit diagram showing how components/nets are connected. |
SSID | Wi-Fi network name compiled into v1 firmware configuration. |
Telemetry | Controller-reported flight/system state sent to the application. |
Through-hole | Component/connector style whose leads pass through holes in the PCB and are soldered on the opposite side. |
UDP | Connectionless network transport used by ESPFlight v1 for controller discovery on port 4210. |
WebSocket | Persistent network channel used by ESPFlight v1 for control, configuration, acknowledgements and telemetry on port 81. |
Flight time | In v1.0.0, accumulated time while ARMED and effective throttle is strictly above 1100. |
Roll | Rotation around the Drone’s front-to-back axis. |
Pitch | Rotation around the side-to-side axis. |
Yaw | Rotation around the vertical axis. |