ModalAI M0184 Gemini 915MHz ELRS
Table of contents
Summary
Transmitter Compatibility
In general, follow Express LRS guidance selecting 900MHz compatible transmitters.
VOXL SDK Support
SDK 1.4.1 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 3.3.5 |
| 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
| 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.
To enter binidng mode, press and hold the Bind button while powering on.
D1 - Green LED
Solid when bound.
D2 - Red LED
Status LED, follows ELRS standards
Recommended Antennas
IPEX MHF + T antenna.
Programming Test Points
TODO
User Guides
VOXL SDK
For VOXL SDK usage, please see voxl-elrs.
Also see the M0184 Software User Guide.
VOXL 2 Wiring Guide (M0054)
List of Certifications
Certifications In Progress.