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Stavros Korokithakis 2020-11-24 04:22:03 +02:00
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content/drone-stuff/_index.md
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Click on a link in the list below to go to that page:
1. [Getting uninverted SBUS on a no-name FrSky-compatible receiver](../../drone-stuff/getting-uninverted-sbus-on-a-no-name-frsky-compatible-receiver)
1. [Getting uninverted SBUS on the FrSky XSR receiver](../../drone-stuff/getting-uninverted-sbus-on-the-frsky-xsr-receiver)
1. [Getting uninverted SBUS/SmartPort on the FrSky XSR receiver](../../drone-stuff/getting-uninverted-sbus-smartport-on-the-frsky-xsr-receiver)
1. [Mini Drak build condensed instructions](../../drone-stuff/mini-drak-build-condensed-instructions)
1. [Omnibus F4 V3 pinout](../../drone-stuff/omnibus-f4-v3-pinout)
1. [Omnibus F4 pro servo diode](../../drone-stuff/omnibus-f4-pro-servo-diode)

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content/drone-stuff/getting-uninverted-sbus-on-a-no-name-frsky-compatible-receiver.md
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I got an [RC receiver](https://www.banggood.com/2_4G-8CH-D8-Mini-FrSky-Compatibel-Receiver-With-PWM-PPM-SBUS-Output-p-1140478.html?rmmds=myorder&cur_warehouse=CN) from Banggood. There's uninverted SBUS on this pad:
![rc-sbus.jpg](../../ccc7571db5d147328860077fdc0aa745.jpg)
[![rc-sbus.jpg](../../ccc7571db5d147328860077fdc0aa745.jpg)](../../ccc7571db5d147328860077fdc0aa745.jpg)
To break this out to the SBUS pad, I had to remove/bridge the resistor that is circled in the image, and remove/bridge the FET on the other side:
![rc-sbus-mosfet.jpg](../../1b0f508a533e45b496c6636d49161b0c.jpg)
[![rc-sbus-mosfet.jpg](../../1b0f508a533e45b496c6636d49161b0c.jpg)](../../1b0f508a533e45b496c6636d49161b0c.jpg)

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content/drone-stuff/getting-uninverted-sbus-on-the-frsky-xsr-receiver.md
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title = "Getting uninverted SBUS on the FrSky XSR receiver"
weight = 1
sort_by = "weight"
insert_anchor_links = "right"
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To get uninverted SBUS on the FrSky XSR/X4RS receiver, you can repurpose the CPPM pad.
Just solder the following:
![xsr-sbus.jpeg](../../f86da9a7aac1413ebd77825897164f7f.jpeg)
> Remove the two resistors and solder a small wire from the CPPM pin pad to both (!!!) of the lower resistor solder pads.
![xsr-sbus2.jpeg](../../815576429ece43789dbc70dfd33517a1.jpeg)
Now the CPPM pad will be uninverted SBUS instead.

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content/drone-stuff/getting-uninverted-sbus-smartport-on-the-frsky-xsr-receiver.md Normal file
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title = "Getting uninverted SBUS/SmartPort on the FrSky XSR receiver"
weight = 1
sort_by = "weight"
insert_anchor_links = "right"
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To get uninverted SBUS/SmartPort on the FrSky XSR/X4RS receiver, you can repurpose the CPPM pad.
Remove the two small resistors shown in the image, and solder the two lower pads (together) to either the CPPM pad or the MOSFET pin shown in the photo:
[![xsr-sbus.jpeg](../../f86da9a7aac1413ebd77825897164f7f.jpeg)](../../f86da9a7aac1413ebd77825897164f7f.jpeg)
They should be soldered like this (remember to solder both resistor pads together):
[![xsr-sbus2.jpeg](../../815576429ece43789dbc70dfd33517a1.jpeg)](../../815576429ece43789dbc70dfd33517a1.jpeg)
Now the CPPM pad will be uninverted SBUS/SmartPort instead.
It seems to be a bit of a gamble whether you get SBUS or SmartPort, it might be firmware-dependent.
On firmware 2.1.0 FPort, I actually got the uninverted FPort signal on the CPPM pin, which is what I wanted.

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content/drone-stuff/omnibus-f4-pro-servo-diode.md
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To isolate the servo 5V rail from the controller's 5V power supply, remove this diode:
![a435bcae86912205b6fac41731285b8d.png](../../6d668e05d8a54580966b94a752f3b7db.png)
[![a435bcae86912205b6fac41731285b8d.png](../../6d668e05d8a54580966b94a752f3b7db.png)](../../6d668e05d8a54580966b94a752f3b7db.png)
Now the servos' 5V rail can be powered from another 5V supply to avoid servo current backflow into the FC.

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content/drone-stuff/omnibus-f4-v3-pinout.md
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This is the pinout of the Omnibus F4 V3:
![53b3161d509dcc7bbfb43c89b16b0bae.png](../../99f5c91454204c1d9740a8d9b876833b.png)
[![53b3161d509dcc7bbfb43c89b16b0bae.png](../../99f5c91454204c1d9740a8d9b876833b.png)](../../99f5c91454204c1d9740a8d9b876833b.png)