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40 lines
1.6 KiB
Markdown
40 lines
1.6 KiB
Markdown
# CPPM Multi module hardware modification
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By default Multi uses the telemetry line to send the received channels using a RX protocol (FrSky, DSM, AFHDS2A, Bayang) to the radio.
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But this does not work on FrSky radios since the telemetry lines of the internal and external modules are shared.
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On a STM32 module and with a simple hardware modification, you can go around this hardware limitation by using CPPM to send the trainer information to the radio.
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There are 2 ways to connect the module CPPM trainer signal available on the STM32 USART1.TX pin (BOOT0 programming TX pin) to the radio:
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1. Use the trainer jack input which is supported by all radios.
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1. Use the heart beat module bay pin 2 which is currently supported by erskyTX but not yet by OpenTX. FrSky ACCESS and X10/X12 radios do not support this mod.
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For the hardware modification you need:
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1. 1K resistor
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1. Wire
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1. Shrink tube to isolate the resistor
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1. For an external trainer, a 3.5mm mono jack plug
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1. Soldering iron and solder
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## Trainer jack
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### Here is the modification on a Banggood 4-in-1 or an iRangeX IRX4 / IRX4+:
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### Here is the modification on a Jumper 4-in-1:
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## Heart beat within the module bay
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### Here is the modification on a Banggood 4-in-1 or an iRangeX IRX4 / IRX4+:
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### Here is the modification on a Jumper 4-in-1:
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