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--- rc:realacc-martian-iv-3-inch-walksnail [29.07.2024 01:21]
vergo created
+++ rc:realacc-martian-iv-3-inch-walksnail [24.09.2024 00:37] (current)
vergo [Martian IV (3 inch, Walksnail)]
@@ Line 1: / Line 1: @@
 ~~NOTOC~~
-====== Martian IV (3 inch) ======
+<note important>Flyable, but VTX antenna is too short and PID tune needs to improvement</note>
-{{ :rc:files:martian4:realacc_martian_4_3.jpg?direct&500|}}
+====== Martian IV (3 inch, Walksnail) ======
 ^  Specifications  ^^
 | Frame | Realacc Martian IV (3 inch) |
-| FC+ESC | HGLRC F4 Zeus |
+| FC+ESC | HGLRC F4 Zeus AIO 15A |
 | Motors | RCX H1304 5000KV |
-| Props | <del>HQProp T3x3x3</del>\\ Emax Avan 3x2.4x3\\ GemFan 3x1.6x3 |
+| Props | Emax Avan 3x2.4x3\\ GemFan 3x1.6x3 |
-| Receiver | <del>FrSky R-XSR</del>\\ ImmersionRC Ghost Atto |
+| Receiver | HappyModel EP1 TCXO (ELRS) |
-| Camera | RunCam Robin with 1.8 mm lens |
+| Camera | Walksnail Avatar HD Pro Camera |
-| DVR | RunCam Mini FPV DVR Module |
+| VTX | Walksnail Avatar HD Pro  |
-| VTX | AKK FX3 |
+| Antenna | TrueRC CORE - 45 mm, U.FL, LHCP |
-| Antenna | Realacc UXII Stubby RHCP antenna |
 | Battery | Tattu 3S 450 mAh 75C\\ Turnigy nano-tech 3S 850 mAh 45C |
 ^ ^^
-| Weight | 121 g\\ 164 g (with 3S 450 mAh battery) |
+| Weight | 137 g\\ 180 g (with 3S 450 mAh battery) |
 | M2M | 14 cm |
-| Flight time | 4-8 minutes |
+| Flight time | 5+ minutes |
-===== Videos =====
-  * https://www.youtube.com/watch?v=ru-_k9lmCbM
 ===== Notes =====
-  - Edges of frame pieces should be sanded to avoid wear in wiring
+  - See [[rc:realacc-martian-iv-3-inch|Martian IV (3 inch)]] for previous notes regarding the frame and FC
-  - ESC didn't have issues with firmware flashing, came with old firmware that doesn't support turtle mode
+  - At least Betaflight 4.4.0 is required for Walksnail OSD, 4.5.1 has been used as initially installed version
-  - FC is essentially 3S max
+  - While the receiver would fit between the FC and VTX, the VTX gets hot enough during normal operations that it would be a bad place for the receiver which has been placed behind the camera instead
-  - The FC bundle provided 470uF 25V capacitor was replaced with a 1000uF 35V (both low ESR)
+  - Walksnail Avatar VTX doesn't have passthrough holes for 20x20 mm stack (or any other for that matter) but long screws from the bottom of the frame have been used instead for mounting leaving decent space below and plenty about the VTX
-  - Configuring F.Port with the FC didn't for some reason succeed in providing two way communication resulting in lack of telemetry, RSSI however gets transmitted and shown in OSD (FrSky R-XSR specific)
+  - Walksnail Avatar HD Pro Kit doesn't come with a camera mount and the hole pattern isn't the same as in RunCam cameras
-  - Power wire needed to be longer than usual due to the short wires used in the Tattu batteries
+  - VTX is rated for 6V-25.2V (2-6S) while FC is 3S and doesn't have a 9V regulator, that's why VTX is directly connected to battery as there's enough headroom for that to not cause problems
-  - For power wire management, it's better to have the battery strapped with wires facing forward
+  - The FC doesn't have pads for the beeper resulting in the connector needing to be used for it
+  - Emax Avan 3x2.4x3 feels to be the better prop compared to GemFan 3x1.6x3 and HQProp T3x3x3 which was also tested but concluded to have a too high pitch, Gemfan Hurricane 3020-3 hasn't been tested
-===== DVR control =====
-The RunCam DVR Module has an extra pad marked H/L which can be used to control the recording functionality. Betaflight supports having the recording start from arming (or other action) and then stop once disarmed (or other action). However, this isn't visible in the user interface and requires CLI configuration. Existing Betaflight documentation can be found from https://github.com/betaflight/betaflight/wiki/Pinio-and-PinioBox
-The following command set the DVR to start recording when armed and stop when disarmed. As a bonus, there appears to be a 1-2 second delay at least when the recording stops after disarming.
-<code>
-resource MOTOR 6 NONE
-resource SONAR_ECHO NONE
-resource PINIO 1 A08
-set pinio_config = 129,1,1,1
-set pinio_box = 0,255,255,255
-save
-</code>
-A08 refers to the S6 wire in the FC multiwire connector. It's mapped in the firmware to motor 6 and sonar echo which both need to first be released before pin i/o can be enabled for gaining DVR control.
 ===== Wiring =====
-{{:rc:files:martian4:martian_3inch_ghost.png?direct&550|}}
+{{:rc:files:martian4:martian_3inch_walksnail.png?direct&600|}}
-  * BB from FC connector (white wire) is for buzzer
+  * Side connector in VTX was used for wiring, pads shown in image just for clarity
-  * S6 from FC connector (yellow wire) is DVR control
+    * Note that the side connector has different pin order than the pads
-  * TX3 from FC is used for VTX SmartAudio
-  * TX6 from FC is used for the receiver
-  * Dual ground wiring in DVR is needed to reduce signal noise
-  * The FC connector is in reality in the top end of the FC but has been marked in the image on the side for clarity, unused wires can be removed
-  * The shown wiring result in the OSD being visible in the video recorded by the DVR

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