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Happymodel PP

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Wiring up your receiver

HM2400 connection

Happymodel PP

The image above show the receiver pinout and their connections. As we're dealing with UART connection, Rx on receiver goes to a TX pad in the FC, and Tx on Receiver goes to an uninverted Rx pad on the FC.

Note

The PP doesn't have a Boot pad so there's no need to bridge any pads.

Configuring your Flight Controller

To configure your flight controller properly, please go through Configure FC page. These settings apply on INAV, Betaflight and other flight controller software.

Ports Tab should be setup so that Serial RX is on the UART where you have soldered the receiver.

Receiver protocol is CRSF with serialrx_inverted = off and serialrx_halfduplex = off.

The next step will not be able to proceed properly and you'll have issues later if any of these are set differently. Once you have configured your Flight Controller software, close its Configurator and unplug-replug the USB cable from the FC or your computer. This will refresh the connection and you'll be ensured that the port is not busy (of high importance with the Passthrough Flashing Method).

Flashing via Passthrough

  • Target: HappyModel_PP_2400_RX_via_BetaflightPassthrough

  • Device Category: Happymodel 2.4 GHz

  • Device: HappyModel PP 2400 RX

via Passthrough

Flashing via Passthrough

The PP receivers do not have Wifi, and so, it can only be updated via Passthrough or STLink(see below).

For the following steps, you should be disconnected from Betaflight or INAV Configurator. Close the FC Configurator and unplug the FC from USB to refresh the connection.

Once wired, power up your FC by connecting a LiPo or, if the receiver is getting powered via USB, connect your USB cable to a vacant port.

Using the ExpressLRS Configurator, with the correct Target selected and Firmware Options set, hit Build & Flash. Wait a bit for the process to finish and you should see a "Success" banner.

Build & Flash

Power-cycle the FC and verify receiver connects to the Tx module (power up the Tx first, then the Receiver).

  • Target: HappyModel_PP_2400_RX_via_STLINK

  • Device Category: Happymodel 2.4 GHz

  • Device: HappyModel PP 2400 RX

via STLink

Flashing via STLink

PP STLink

This will require connecting a ST Link to CLK, DIO, 5V and GND.

Then with the correct Target selected and Firmware Options set, click Build & Flash in the ExpressLRS Configurator. Wait for the process to finish and you should see the "Success" banner.

Build & Flash

Once done, wire your receiver to Flight Controller and you should be ready for the next steps.