ELRS v0 Prototype Datasheet
Table of contents
Summary
PROTOTYPE RELEASE
NOTE: THIS PRODUCT IS NOT INTENDED FOR PUBLIC USE AND IS A PROTOTYPE ONLY
Limitations:
- VOXL SDK 1.2+ is required
- only a single RF path is available the initial release using J1.
Transmitter Compatibility
In general, follow Express LRS guidance selecting 900MHz options.
VOXL SDK Support
SDK 1.2 or newer required. For VOXL SDK usage, please see voxl-elrs.
Dimensions
3D Drawings
TODO
2D Drawings
TODO
Features
| Feature | Details |
|---|---|
| Weight | TODO g |
| HxW | 33mm x 22mm |
| Frequency Bands | 915Mhz |
| Input Voltage | 5VDC |
| Serial Output | CRSF, 420k default |
| RF Chip | Dual SX1276 |
| Antenna | IPEX MHF |
| Firmware | ELRS 3.2 |
| MCU | 72MHz, 32-bit ARM M3 STM32F103C8T6 |
| Memory | 20Kb RAM |
| 64Kbit Flash | |
| Inputs | UART, push button |
| Outputs | QTY PWM, UART, R/G LED |
Hardware
Hardware Block Diagram
Connectors
Summary
BETA release: prototype hardware shown here with bluewire
| Connector | Description |
|---|---|
| J1 | Antenna 1 |
| J2 | Antenna 2 (not used in beta release) |
| J4 | PWM, RC UART |
| S1 | Bind button |
| D1 | Green LED |
| D2 | Red LED |
J4 - Header Solder Pads
| Pin | Name | Notes |
|---|---|---|
| 1 | GND | |
| 2 | P0 | PWM Channel 0, 3P3V |
| 3 | P1 | PWM Channel 1, 3P3V |
| 4 | P2 | PWM Channel 2, 3P3V |
| 5 | P3 | PWM Channel 3, 3P3V |
| 6 | GND | |
| 7 | TX | ELRS TX (to VOXL2), 3P3V, 420k CRSF |
| 8 | RX | ELRS RX (from VOXL2), 3P3V, 420k CRSF |
| 9 | 5V | Input Power, 5P0V |
| 10 | GND |
J1 - ANT1
Main RF path (915MHz).
J2 - ANT2
NOT USED IN BETA RELEASE
S1 - Bind button
Used to put receiver in bind mode.
D1 - Green LED
Solid when bound.
D2 - Red LED
Status LED, follows ELRS standards
Recommended Antennas
IPEX MHF + T antenna.
Programming Test Points
TODO
Software
Summary
| Component/Repo | Notes |
|---|---|
| elrs-build-docker | Docker container that can clone/build FW with ease |
| VOXL SDK | Used to deploy all required software/firmware components to VOXL / ELRS hardware |
| ExpressLRS_3.2.1 | Fork of Express LRS supporting ELRSv1 (goal is to mainline) that runs on ELRS v1 (M0139) |
| crsf_rc | PX4 driver running in voxl-px4 that communicates over CRSF to ELRS v1 hardware |
| voxl-elrs | VOXL2 command line utility, used to update FW/config on ELRS v1 from VOXL2, part of the SDK |
| FW bootloader | Closed source, shared with voxl2-io and VOXL ESC |
Software Block Diagram
User Guides
VOXL SDK
For VOXL SDK usage, please see voxl-elrs.
VOXL 2 Wiring Guide (M0054)
