The Happymodel 2.4GHz ELRS nano series receiver is an open source program based on ExpressLRS, we have 3 types rx module released.
The PP RX is designed by @Jye Smith from ExpressLRS development team. Its main hardware architecture is STM32L432KBU6 MCU and SX1280 RF chip. It has a built-in ceramic antenna, which is super light and small in size.
On the basis of PP RX, we have developed the Nano 2.4GHz rx of ESP8285 version named EP1 and EP2. The RF module of EP1/EP2 is the same like PP RX and use ESP8285 MCU . So you can upgrade firmware by WIFI , that’s too simple .
Due to the low-latency and high-refresh-rate RF module, they are very comfortable for FPV race and Long Range FPV. And very suitable for Tiny whoop because of the ultra light and Nano size.
PP(w/ antenna) | EP1(w/o antenna) | EP2(w/ antenna) | |
MCU | STM32L432KBU6 | ESP8285 | ESP8285 |
RF Chip | SX1280IMLTRT | SX1280IMLTRT | SX1280IMLTRT |
Antenna | SMD Ceramic | Omnidirectional | SMD Ceramic |
Dimension | 10mm*10mm*6mm | 10mm*10mm*3mm | 10mm*10mm*6mm |
Weight | 0.47g | 0.42g | 0.44g |
Firmware target | 6cb8152d | aec8ad82 | aec8ad82 |
Firmware upload | Betaflight pass-through | Wifi | Wifi |
Specifications:
PP_RX
Type: ISM
STM32L432KBU6 MCU
SX1280IMLTRT RF Module
SMD Ceramic antenna
Frequency Range: 2400 MHz to 2500 MHz
Maximum receive refresh rate: 500Hz
Minimum receiver refresh rate: 25Hz
Working voltage: 5v
Weight: 0.47gram
Dimension: 10mm*10mm*6mm
Peak gain: 3.7dB
EP1_RX
Type: ISM
ESP8285 MCU
SX1280IMLTRT RF Module
Omnidirectional antenna
Frequency Range: 2400 MHz to 2500 MHz
Maximum receive refresh rate: 500Hz
Minimum receiver refresh rate: 25Hz
Working voltage: 5v
Weight: 0.42gram(without antenna)
Dimension: 10mm*10mm*3mm
Peak gain: 2.23dB
Package include 1pcs 40mm and 1pcs 90mm Omnidirectional antenna
EP2_RX
Specifications:
Type: ISM
ESP8285 MCU
SX1280IMLTRT RF Module
SMD Ceramic antenna
Frequency Range: 2400 MHz to 2500 MHz
Maximum receive refresh rate: 500Hz
Minimum receiver refresh rate: 25Hz
Working voltage: 5v
Weight: 0.44gram
Dimension: 10mm*10mm*6mm
Peak gain: 3.7dB
Notes:
Since the Official Perfect version of ELRS firmware has not been released yet, currently our PP_RX, EP1/EP2 RX and ES24TX pre-loaded firmware are all beta versions, you can upgrade the official firmware when Official perfect target available.
More details
https://github.com/ExpressLRS/ExpressLRS
Bind procedure:
- Supply power to the PP/EP1/EP2 rx, wait until the LED on the RX is off, immediately turn off the power, and then repeat again the above steps. When the RX is powered on for the third time, the LED light will start to double-flash, which means that the RX enters the binding mode
- Insert the ES24TX module or other DIY 2.4G ELRS TX to Radio transmitter, and choose External RF mode to CRSF protocol, then you can find ELRS menu from the Radio systems(Need to copy the ELRS.LUA file to the SD-Card tools first), Enter into ELRS and press [Bind], the LED on the RX module will getting to be solid if bind successfully.
- Receiver LED status meanings:
PP RX: LED solid means bind successful or Connection established; LED double-flash means in bind mode; LED flash slowly means no signal connection from the TX module
EP1/EP2 RX: LED solid means bind successful or Connection established; LED double-flash means in bind mode; LED flash slowly means no signal connection from the TX module; LED flash fast means in WIFI hotspot mode, you can connect the WIFI of the RX and upgrade firmware of the RX via visit 10.0.0.1 from the web browser(password: expresslrs)
Hi. What’s the difference beteween expresslrs ep1 and ep2. And what does mean with and without antenna on your chart? I have heard one of them can be used without antenna, which one it is and what’s the range?
Thanks.
Ep1 goes right to wifi flashing immediately after power up. Worked fine for one flight, grabbed a battery and immediately started flashing fast. Can no longer manually bind it. I’ve reflashed it and still the same problem. Any suggestions
EP1を購入しましたが、LEDの色が黄色と緑色の2種類がありましたが、違いを教えて下さい。
また、緑色のEP1は、WiFiでファームウェアを更新したところ、その後、電源を入れたらLEDが点灯し、バインドモード及びWiFiモードになりません。
このままでは、使用できませんので、対処法を教えて下さい。
なお、緑色のEP1は、2個、同じ症状が出ています。
よろしくお願いいたします。
I purchased EP1, but there were two types of LED colors, yellow and green. Please tell me the difference.
Also, for the green EP1, after updating the firmware with WiFi, when the power is turned on after that, the LED lights up and it does not go into bind mode or WiFi mode.
It cannot be used as it is, so please tell me how to deal with it.
Two green EP1s have the same symptoms.
Thank you.
I have same problem with my receiver. When I turn power on, it only lights up with green (LED on the RX is not tuning off or double-flash) and I can’t neither bind, neither update by WiFi. Video https://youtu.be/CWT8QMrb810