ELRS 2.4GHz Micro Receiver
The BETAFPV micro receiver is based on the ExpressLRS project, an open source RC link for RC applications. ExpressLRS aims to achieve the best possible link performance in terms of speed, latency and range. This makes ExpressLRS one of the fastest RC links available while still offering long range performance.
ExpressLRS PWM Receivers
ExpressLRS now supports direct PWM output from receivers specifically designed for this mode. The BETAFPV ELRS micro receiver features PWM output for application on fixed-wing aircraft, helicopters, RC cars, boats, etc. and supports failsafe function, which can protect RC models from losing control. In addition, the plug-and-play design makes it very easy and intuitive to use.
Note: To work with PWM receiver, make sure the TX and RX firmware is ELRS V2.0.0.
BETAFPV ExpressLRS Receivers
Choosing a suitable receiver for flying your quadcopter or other RC models is very important. BETAFPV ExpressLRS receivers, including ELRS Lite, Nano, Micro and the newest SuperD, largely meet the pilots' requirements for FPV flight.
| SuperD RX | MicroRX | NanoRX | LiteRX | |
| Weight | 1.1g (RX only) | 3.5g (RX only) | 0.7g (RX only) | 0.47 g (tower), 0.53 g (plate) |
| Antenna | IPEX MHF+T Antenna | IPEX MHF+T Antenna | IPEX MHF+T Antenna | SMD Ceramic Antenna |
| MCU | ESP32-PICO-D4, dual SX1280 | ESP8285 | ESP8285 | ESP8285 |
| RF Chips | Double SX1280 + double PA | SX128X | SX1280 + PA, SX1276 + PA | SX128X |
| Frequency | 2.4GHz ISM | 2.4GHz ISM | 2.4 GHz ISM, 915 MHz (FCC), 868 MHz (EU) | 2.4GHz ISM |
| Power of telemetry | 100mW | 17mW | 100mW | 17mW |
| Serial Output Protocol | CRSF | PWM or CRSF | CRSF | CRSF |
| Model type | FPV Drone, Fixed Wing Aircraft | Fixed Wing Aircraft, Helicopters, RC Cars, RC Boats | FPV Drone | Scream Drone |
Technical specifications
- Item: BETAFPV ELRS Micro Receiver
- Weight: 4.5g (with antenna)
- Antenna: IPEX MHF + T antenna (80mm T dipole antenna recommended)
- PWM Channel: 5 channels
- Serial output protocol: PWM or CRSF
- Size: 19mm*32mm*9mm (without antenna)
- MCU: ESP8285/SX1280/SX1281
- Telemetry power: 12.5 dBm/17 mW
- Frequency bands: 2.4GHz ISM
- Input voltage: 5V~9V DC at "+" pad.
- Default firmware version: ExpressLRS v2.0
- Adapted RC model type: multi-rotors, fixed-wing aircraft, helicopters, RC cars, RC boats, etc.
Characteristics
Below is the schematic of the ELRS micro receiver.
Note: The firmware version of the micro receiver produced by our company is ELRS 2.0.0. ELRS Innovative team has officially released version 2.0.0, which is not compatible with version 1.x. Significantly, the TX module and the receiver must be the same ELRS version, otherwise the frequency cannot match properly.
Note: The micro receiver also supports CRSF flash output firmware, in this case CH2 corresponds to TX and CH3 corresponds to RX.
Learn more about ExpressLRS
ExpressLRS is an open source RC binding for RC applications. Everyone could find this project on Github .
ExpressLRS is based on Semtech Lora Hardware SX127x or SX1280 for RX and TX respectively. It aims to achieve the best possible link performance in terms of speed, latency and range. At 900MHz a maximum packet rate of 200Hz is supported. At 2.4GHz a whopping 500Hz is currently supported with a custom OpenTX build. This makes ExpressLRS one of the fastest RC links available while still offering long range performance.
More and more suppliers are starting to support the ExpressLRS radio protocol in different parts, such as radio transmitter with ELRS in stock, drone with integrated ELRS receiver, ELRS TX module for JR bay or Nano bay. BETAFPV team is taking part in this project and provides a series of ExpressLRS components.
Binding procedure
The Micro receiver comes with the official protocol V2.0.0 and has not been set for a binding phrase. So make sure that the RF TX module works with the official protocol of the main version V2.0.0 and no binding phrase has been set in advance.
- Enter linking mode by connecting and disconnecting the Micro Receiver three times;
- Make sure the LED flashes twice, this indicates that the Micro Receiver is in pairing mode;
- Make sure the RF TX module or radio transmitter also enters binding mode, which sends out a binding pulse;
- When the LED light is solid, it indicates that the devices have been paired successfully.
Note: Once the devices are successfully paired, the receiver will memorize the pairing information. There would be no need to reconnect for next use as the devices would be connected automatically.
Note: If you reflash the firmware of the micro receiver with your own binding phrase, make sure the RF TX module has the same binding phrase to perform an automatic binding.
Failsafe and PWM output
When the connection or signal is lost between the radio transmitter and receiver, the failsafe function will adjust all channels to the failsafe values set by users, maintaining maximum safety and preventing them from flying away. It is necessary to set the failsafe values correctly if you are not using a flight controller, such as a fixed-wing RC airplane.
- Turn on the Micro receiver and wait 20 seconds without binding it.
- When the indicator flashes quickly, the receiver's WiFi has been activated.
- Connect WiFi via computer or mobile phone.
- Wi-Fi Name: ExpressLRS RX
- WiFi PWD: expresslrs
- Open the website address: http://10.0.0.1 and set your failsafe values.
Note: Failsafe values are absolute and do not use the "invert" flag.
The LED status indication of the micro receiver is shown below.
| Indicator status | Sense |
| Fixed on | Connected successfully |
| Double flash | Binding state |
| Flashing slowly | Connection failed |
| Flashing fast | Wi-Fi update status |
FAQ
Click here to download the ELRS micro receiver manual.
Recommend ExpressLRS Recovery Dongle to unlock the receiver.
Package Included
- 1 * ELRS Micro Receiver
- 1 * BETAFPV 80mm T Antenna
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