FlySpark ELRS-to-PWM Output Module for Drone Payload Release | ELRS Receiver to PWM Servo Converter, CRSF Input, Built-in 5 V Step-Down, Standard Servo Drive & Compact Footprint

The FlySpark ELRS-to-PWM Output Module is a compact ELRS receiver to PWM converter for drone payload release systems. It converts the signal from an ExpressLRS (ELRS) receiver into a standard PWM servo signal, and its built-in 5 V step-down module powers the servo, so a release hook or PWM-triggered dropper can be driven straight from the drone's ELRS radio link.

The module is part of the FlySpark UAV Payload Droppers & Release Systems range, supplied and supported in India by AnuShakti Infotech Pvt. Ltd., with export enquiries welcome. It solves a common integration problem: many ELRS receivers on FPV-class and custom-built drones output only CRSF serial data, while servo-driven droppers expect a PWM signal and a clean 5 V supply. With this board in the release path, the payload channel no longer depends on a spare PWM output on the flight controller.

The board is small and takes up very little space on the frame. The source data does not publish a channel count, input voltage range, dimensions or weight, so FlySpark confirms these on order against your receiver, servo and dropper before supply. No figure on this page has been estimated.

WHY CHOOSE THE FLYSPARK ELRS-TO-PWM OUTPUT MODULE

• • Direct ELRS-to-PWM conversion lets a standard servo or PWM dropper run from an ELRS receiver
• • Built-in 5 V step-down powers the servo, so no separate BEC is needed in the release circuit
• • Keeps payload release independent of flight-controller outputs and firmware configuration
• • Small footprint fits FPV-class 7–10 inch frames and custom multirotors
• • Matched to the FlySpark PWM dropper, smoke and mothership-release range, with pairing confirmed by FlySpark

HOW THE ELRS-TO-PWM MODULE WORKS

The operator assigns a switch on the ELRS transmitter to the release channel. The drone's ELRS receiver passes the channel data to the module over the CRSF serial link, the on-board microcontroller decodes it and generates a PWM servo signal, and the servo opens the dropper latch or release hook. The built-in step-down converts the drone supply to 5 V for the servo, so the receiver and flight controller are not loaded by servo current.

• ELRS-TO-PWM MODULE KEY FEATURES
• • Converts the ELRS receiver signal directly to a PWM servo signal
• • Built-in 5 V step-down (BEC) module powers the servo
• • Drives standard hobby-type servos
• • Adds a PWM release channel to ELRS / CRSF-only receivers
• • No flight-controller output needed in the release path
• • Small single-board footprint for FPV-class and custom frames
• • Pairs with FlySpark PWM droppers, smoke units and release hooks
• • Solder-pad interface for power, receiver input and PWM output
• • Channel count, input range, size and weight confirmed on order
• • Integration support, pad map and fail-safe guidance from FlySpark

COMPATIBLE AIRCRAFT & MOUNTING

The module is intended for ELRS-controlled FPV-class quadcopters (typically 7–10 inch) and custom-built multirotors that carry a PWM payload-release unit. It is fixed to the frame with foam tape or zip-ties, insulated in heat-shrink and kept clear of the propellers and high-current battery leads, with wires soldered to its edge pads. DJI aircraft do not use ELRS receivers, so DJI users should choose the light-sensor (LED) dropper versions or the light-sensor / PSDK quick-release mounts instead.

VARIANTS

The module is supplied as a single standard version (SKU FSP-DRP-ELRSPWM-STD). Channel count, pad map and input voltage range are confirmed on order for your receiver, servo and dropper.

DEFENCE & MILITARY APPLICATIONS

For armed forces, paramilitary units and government security agencies that fly ELRS-controlled FPV-class drones, the module provides a simple, independent PWM release channel for marking, signalling, training and logistics payloads.

• • Marker and screening smoke release from ELRS-controlled FPV-class drones
• • Signalling and illumination-device drops for night training
• • Inert training payload drops for drone-operator qualification
• • Sensor, beacon and radio-relay emplacement
• • Emergency resupply: tourniquet kits, batteries, radios and water purification tablets
• • Decoy and reflector release for exercise scenarios
• • Mothership release of small drones via the single-lock PWM release
• • EOD and CBRN team training with inert dummies
• • Perimeter-sensor seeding along borders and installations
• • Integration of other authorised payloads by the end user in accordance with national law and procurement rules

CIVILIAN & COMMERCIAL APPLICATIONS

For rescue teams, utilities, agriculture and research groups, the module turns a standard ELRS-controlled drone into a servo-actuated drop platform with minimal wiring.

• • Search and rescue drops of radios, flotation aids and medical kits
• • Utility pilot-line drops for power-line stringing
• • Firefighting extinguisher-ball drops where size and lift allow
• • Agriculture: seed balls and bio-control capsules
• • Fishing bait release from custom drones
• • Wildlife research tag and sampler deployment
• • Mountain and maritime rescue support
• • Event effects and controlled confetti or streamer release
• • University and drone-lab research on servo-actuated payloads

COMPARE THE FLYSPARK DROPPER RANGE

The ELRS-to-PWM Output Module is the interface board in the FlySpark dropper range. Choose it when your drone flies ELRS and your dropper is PWM-triggered; CRSF-input droppers connect to the receiver directly, and light-sensor versions need no wiring at all.

• • FlySpark ZD1-PWM-V3 – lightweight single-channel dropper for FPV-class and custom drones; pairs directly with this module
• • FlySpark ZD2-PWM-V3 – dual-channel dropper with two independently controlled payloads
• • FlySpark M18ZD1-PWM-V1 – single-channel dropper sized for M18-class smoke canisters
• • FlySpark SMOKER2-PWM – drone smoke generator for marking and signalling
• • FlySpark ZD4-CRSF / ZD8-CRSF – multi-channel droppers with direct CRSF input (no converter needed)
• • FlySpark single-lock PWM mothership release – carries and releases drones of 8 inch class and below

• STANDARD SUPPLY
• • FlySpark ELRS-to-PWM Output Module (1 pc)
• • Pad map and wiring guidance for the confirmed configuration
• • Integration and fail-safe setup advice from FlySpark

IMPORTANT USE NOTE

The module is supplied only to verified end users. The buyer is responsible for using lawful payloads, obtaining airspace permissions and complying with export controls. Payload fit is confirmed by FlySpark for the end user's approved payload. Never fly over people, always test the release with propellers removed first, and set the receiver fail-safe so the release output holds closed if the link is lost.

FREQUENTLY ASKED QUESTIONS

Q: What is an ELRS-to-PWM converter? A: It is a small electronic module that takes the digital channel data from an ExpressLRS (ELRS) receiver and turns it into a standard PWM servo signal. It lets a servo, release hook or PWM-triggered dropper be driven directly from an ELRS radio link.

Q: What does the FlySpark ELRS-to-PWM Output Module do? A: It converts the ELRS receiver signal to PWM to drive servos, and its built-in 5 V step-down module supplies the servo power. It is the interface board that connects an ELRS-controlled drone to a PWM payload-release unit.

Q: Why would I need this module for a drone dropper? A: Many ELRS receivers used on FPV-class and custom drones output only CRSF serial data, while servo-driven droppers expect a PWM signal and a clean 5 V supply. The module bridges the two so the release channel does not depend on a spare PWM output on the flight controller.

Q: What input signal does it accept? A: It is designed for ELRS receivers, which communicate over the CRSF serial protocol. The board also carries a pad marked SBUS; SBUS operation and the exact receiver wiring are confirmed by FlySpark on order.

• Q: How many PWM output channels does it have?
• A: The channel count and pad mapping are not published in the source data, so they are confirmed on order against your dropper and receiver configuration.

Q: What servos can it drive? A: It drives standard hobby-type servos from its built-in 5 V step-down. Servo current draw, torque and the number of servos on one module are checked by FlySpark for each integration.

• Q: What input voltage does it need?
• A: The input voltage range is confirmed on order. FlySpark checks it against your drone battery configuration before supply.

• Q: How big is the module and what does it weigh?
• A: It is a single compact board with a small footprint that fits inside or under a typical FPV-class frame. Exact dimensions and weight are confirmed on order.

Q: Which FlySpark droppers work with this module? A: It is intended for PWM-triggered units such as the ZD1-PWM-V3 single-channel dropper, ZD2-PWM-V3 dual-channel dropper, M18ZD1-PWM-V1 smoke-canister dropper, SMOKER2-PWM smoke generator, XD2-PWM-V2 safety-pin dropper and the single-lock PWM mothership release. FlySpark confirms each pairing.

Q: Do I need it for the LED light-sensor or CRSF dropper versions? A: No. Light-sensor (LED) versions trigger optically from a DJI Mavic or Air-class auxiliary light, and CRSF versions connect directly to an ELRS receiver. The module is for PWM versions on ELRS-controlled aircraft.

Q: Does it work with DJI drones? A: DJI consumer and enterprise aircraft do not use ELRS receivers, so the module is not needed there. Use the light-sensor (LED) dropper versions or the PSDK / light-sensor quick-release mounts instead.

Q: Is the module a drone payload dropper by itself? A: No. It is the control and power interface. It is used with a servo-driven release mechanism or one of the FlySpark PWM droppers to form a complete payload-release system.

Q: How is the release channel made safe? A: FlySpark recommends mapping release to a guarded or two-position switch on the transmitter, setting the receiver fail-safe so the release output holds the closed position if the link is lost, and bench-testing with propellers removed before any flight.

Q: How is the module mounted on the drone? A: It is fixed to the frame with double-sided foam tape or zip-ties, insulated in heat-shrink and kept away from propellers and high-current battery leads. Wires are soldered to the edge pads.

Q: Can it be used for search and rescue drops? A: Yes. Paired with a servo release hook or a FlySpark PWM dropper, it allows radios, flotation aids and first-aid pouches to be released from an ELRS-controlled drone during rescue operations.

• Q: What is the ELRS-to-PWM module price in India?
• A: Price is on request. Contact FlySpark on WhatsApp or email with your drone, receiver and dropper details for a quotation in INR or for export.

Q: What is the lead time, and do you export? A: Lead time is confirmed with the quotation. FlySpark supplies across India and handles export enquiries subject to applicable export-control and end-user documentation.

Q: Can this module be used to release weapons? A: FlySpark supplies the module only to verified end users for lawful payload release. Any payload integration must comply with national law, airspace rules and export controls, and is the responsibility of the end user and their authorised integrator.

Q: Does FlySpark provide integration support? A: Yes. FlySpark / AnuShakti Infotech Pvt. Ltd. confirms the pad map and channel assignment, advises on wiring, fail-safe and servo selection, and can supply the module as part of a complete dropper package.

Q: What warranty is included? A: Warranty covers manufacturing defects for 1 year under approved use and normal operating conditions. Damage from reverse polarity, over-voltage, short circuits, crashes or unauthorised modification may not be covered.