search

ExpressLRS / ExpressLRS-Hardware

STM32/ESP32/ESP8285-based High-Performance Radio Link for RC applications
248 stars 98 forks source link

DIY 2.4G 20x20 RX build guide incorrect #20

Closed mgtschida closed 2 years ago

mgtschida commented 2 years ago

When building the DIY receiver at this link (https://github.com/ExpressLRS/ExpressLRS-Hardware/tree/master/PCB/2400MHz/RX_20x20/v2.0) I was unable to flash them upon build completion. Through the help of JamesK I removed the R5 resistor and was able to successfully flash the receivers using the ELRS Configurator. Hooking up to a flight controller, the receiver displayed a similar behavior to the EP1/2 where if hooked up to an F411 AIO the ESP is forced into bootloader mode. Adding a 470R resistor between the TX pin of the ESP-01F and 3.3V output of the regulator corrected this issue (thanks again to JamesK).

I've forked the readme and updated it as well as added a few images of the pullup resistor placement. https://github.com/mgtschida/ExpressLRS-Hardware/blob/master/PCB/2400MHz/RX_20x20/v2.0/README.md

ucflumm commented 2 years ago

I'm having same issues as you! In the diagram R3 is a 330R. Someone reverted the readme back to the incorrect one I have no clue why??

kkbin505 commented 2 years ago

I experience the same issue, my method is to bridge the R3 and keep R5. Works well and no issue ELRS_RX_20_Issue .

maybenikhil commented 2 years ago

Updated the readme to match thank you so much!