Can't Bind TX to RX | ExpressLRS Community | Page 1

grizzled sleet Jul 14, 2023, 6:17 PM

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I'm officially completely stumped for my first ELRS build. I have a RM TX16s MKII Max 4in1 with a Ranger Micro JR module, a HappyModel RX, and a SpeedyBee F403 V3 FC. Everything was purchased new from RDQ approximately 2 weeks ago. I've attached screenshots of the RX and TX information from the ELRS configurator. To the best of the my knowledge both items have the same bindphrase and have the same firmware which I flashed via my home wifi. When I power my quad, the green LED blinks slowly like it is searching for a TX, then after the set time, it switches to the rapid blink wifi mode. I've tried reflashing both components firmware and have not had any luck. In my TX, I have the internal 4in1 module turned off and the external module activated and the module LED powers up as well as the ExpressLRS Lua script works just fine and shows the version of firmware I tried to flash. I followed my FC's instructions for wiring a CRSF receiver so G to G, 5v to 5V, TX to RX, and RX to TX and I don't think there are any shorts because everything powers up just fine with a LiPo or connects to betaflight without the magical white smoke appearing. Thank you for any help, I really appreciate it!

silent sluice Jul 14, 2023, 6:50 PM

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do you have screen shot of expresslrs lua script and your external RF (in model) ?

grizzled sleet Jul 14, 2023, 7:48 PM

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silent sluice do you have screen shot of expresslrs lua script and your external RF (in model)...

stray panther Jul 14, 2023, 10:03 PM

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Try reflash the Ranger via USB/UART using the web flasher, making sure "erase flash" is checked on the last page as shown.
https://pkendall64.github.io/elrs-web-flasher/
https://media.discordapp.net/attachments/798006228450017290/1062848548288335922/image0.png

stray panther Jul 14, 2023, 10:04 PM

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grizzled sleet

And set Baudrate under External RF to 921k or greater. 1.87M should be safe, 5.25M should work also.

grizzled sleet Jul 14, 2023, 11:41 PM

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stray panther Try reflash the Ranger via USB/UART using the web flasher, making sure "erase fl...

Reflashing via the web based flasher following your instructions did not work unfortunately. Would it be possible that the receiver/TX module is just bad but still boots up when given power?

stray panther Jul 14, 2023, 11:43 PM

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Do you have any other ELRS hardware to test with? Are any components missing or damaged on the receiver?

grizzled sleet Jul 14, 2023, 11:44 PM

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I don't have any other equipment but I'll buy another receiver and start there since they're cheap.

stray panther Jul 14, 2023, 11:46 PM

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Can you post some clear photos of both sides of the receiver?

grizzled sleet Jul 15, 2023, 12:02 AM

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stray panther Jul 15, 2023, 12:07 AM

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I don't see anything obviously damaged

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Hopefully the replacement receiver works

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Please report back

grizzled sleet Jul 15, 2023, 12:08 AM

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will do, thank you for the help

#Can't Bind TX to RX