FlipIRFreq

FlipIRFreq is a Flipper Zero external app for sending either a high-frequency IR carrier or a low-frequency IR pulse train with a user-selected frequency, duty cycle, burst length, and output pin.

Features

• Two signal paths in one app:
  • Carrier mode for standard IR carrier generation
  • Pulse mode for low-frequency on/off IR pulsing
• Two transmit styles:
  • Burst for a timed send
  • Continuous for a sustained output until stopped
• Carrier frequency range: 10 kHz to 1 MHz
• Carrier frequency tuning:
  • tap Left / Right for 100 Hz
  • hold Left / Right for 1 kHz
• Pulse frequency range: 10.0 Hz to 500.0 Hz
• Pulse frequency tuning:
  • tap Left / Right for 0.1 Hz
  • hold Left / Right for 1.0 Hz
• Adjustable duty cycle from 1% to 99%
• Configurable burst length from 1 ms to 5000 ms
• Output routing:
  • Auto
  • Internal
  • External (PA7)
• Dedicated on-screen Send action
• Live TX animation while broadcasting
• Scrollable menu so the UI stays readable on the Flipper display
• Footer attribution matching the rest of the Flip app family
• Settings are persisted across launches
• Single-screen workflow optimized for quick testing and experimentation

Screenshots

Main	Pulse Mode
Main control screen for carrier transmission setup.	Pulse mode configured for low-frequency IR pulsing.

Send Screen
Transmit action selected and ready to start or stop output.

Menu Fields

The app exposes the following fields:

• Frequency
  • In Carrier mode this is the carrier frequency in Hz
  • In Pulse mode this is the pulse rate in tenths of a hertz, shown like 10.5 Hz
• Duty Cycle
  • Output duty cycle percentage
• Burst Time
  • Timed transmit length used when Tx Mode is set to Burst
• Signal Type
  • Signal path: CARR or PULSE
• Tx Mode
  • Transmit style: BURST or CONT
• IR Output
  • Output routing: AUTO, INT, or EXT
• Transmit
  • Starts transmission
  • Changes to STOP while transmitting

Signal Modes

Carrier

• Uses the Flipper infrared HAL for high-frequency IR generation
• Best for normal IR carrier experiments and compatibility testing
• Supports 10 kHz through 1 MHz

Pulse

• Uses direct GPIO timing on the selected IR output pin
• Best for low-frequency blinking, gating, and slow pulse experiments
• Supports 10.0 Hz through 500.0 Hz

Controls

• Up / Down: select the field to edit
• Left / Right: change the selected value
• Hold Left / Right: adjust faster
• Move to Send and press OK: start transmitting
• Press OK while transmitting: stop transmitting
• Press Back while transmitting: stop transmitting
• Press Back while idle: exit the app

Behavior Notes

• Burst mode stops automatically when the configured burst time completes
• Continuous mode keeps broadcasting until stopped by the user
• While transmitting, the current action is locked to the send/stop control so stopping is always one button press away
• A live TX indicator is shown while output is active
• After a stopped transmission, the header status shows stopped
• The selected row highlight has been tuned for better visibility on-device
• Settings are saved automatically and restored on next launch

Notes

• Auto output uses the firmware's IR output detection to pick the active transmitter.
• Carrier mode uses the Flipper infrared stack with a raw single-mark signal at the selected carrier settings.
• Pulse mode drives the selected IR output pin directly for low-frequency on/off pulsing.
• This app is intended for bench testing, tuning, and experimentation with IR carrier behavior.

Project Layout

• flipirfreq.c - main application source
• application.fam - Flipper Zero app manifest
• assets/ - app assets
• icon.png - Flipper package icon

Building

This repository contains a standard Flipper Zero external app layout and includes a helper script, build.ps1, that mirrors the project into your firmware tree and runs fbt.

Default usage:

.\build.ps1

Preview the sync without copying, deleting, or building:

.\build.ps1 -PreviewSync

Override the source or target directories explicitly:

.\build.ps1 `
  -SourceDir C:\Users\Joe\Projects\FlipIRFreq `
  -FirmwareDir C:\Users\Joe\Projects\flipperzero-firmware `
  -TargetDir C:\Users\Joe\Projects\flipperzero-firmware\applications_user\flipirfreq

Installing

1. Copy the generated .fap to your Flipper Zero SD card.
2. Launch FlipIRFreq from the Apps menu.

Author

Created by ConsultingJoe.