HappyModel ExpressLRS Long Range 915mhz combo is a wireless transmission kit developed and designed based on the open-source software ExpressLRS.

HappyModel ELRS Long Range 915MHz ES900TX/RX Micro Module Combo (assembled)

HappyModel ExpressLRS Long Range 915mhz combo is a wireless transmission kit developed and designed based on the open-source software ExpressLRS. This set of modules is characterized as ultra-long-range, stable operation and low latency. The module is compatible with most Opentx remote controllers, especially suitable for Radiomaster TX16S. We have specially customized the heat sink for the transmitter module, and also reserve the installation position of the 2006 fan which can help the transmitter module cool down under high power conditions.

This version is already assembled and ready to go.

Specifications

ES900TX

• MCU: ESP32+ESP8285
• Dimension: 55mm*39mm*11mm
• Weight: 9.2gram (only the TX module)
• Antenna connector: SMA
• VCC input: 5~13v, Recommend 5v~9v
• RF Frequency optional: 915mhz or 868mhz(EU)
• Maximum Output Power: <33dBm(For >27dBm operation, we recommend add a fan for force cooling)
• Wifi update firmware function for ES900TX would be available in a short time.

ES900RX

• MCU: ESP8285
• VCC input: 5v
• Operation current: ~100Ma
• Rx To FC protocol: CRSF
• RF Frequency optional: 915mhz or 868mhz(EU)
• Dimension: 12mm*12mm*3mm
• Weight: 0.60 gram (exclude antenna)
• Antenna connector: IPEX1
• Telemetry output Power: <17dBm
• RC7 Firmware for ES900RX download:

Includes

• 1x ES900 TX module 915MHz
• 1x TX antenna 915MHz
• 1x Molding JR Bay mounted case for TX module
• 1x Heat sink
• 1x Adapter wire
• 1x 2006 Fan

Bind procedure

1. Supply power to the ES900RX, wait until the red LED on the ES900RX is off, immediately turn off the power, and then repeat the above steps again. When the ES900RX is powered on for the third time, the red LED light will start to double flash quickly, which means that the ES900RX enters the binding mode
2. Insert the ES900TX or ES915TX module into the Radio transmitter, and choose External RF mode to CRSF protocol, then you can find the ELRS menu from the Radio systems, Enter into ELRS and press [Bind], and the Red LED on the ES900RX module will turn off then start blinking slowly and finally getting to be solid, this means bind successfully.

ES900RX firmware update by wifi procedure

1. Make the ES900RX enter into Bind mode and then wait around 1 minute and don’t bind with it, then the ES900RX would get into Wifi mode automatically, you could connect the wifi hot pot “ExpressLRS RX” by entering the password “expresslrs”
2. Visit the firmware update website by entering “10.0.0.1”, and choose the correct firmware then click “update”, wait for around 1~2 minutes, the update progress would be finished and you can find “firmware update successful and reboot” , which means the update is finished.