Chip-dat/pixART-dat/PMW3901-dat.md
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+# PMW3901-dat.md
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+General Description
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+The PMW3901MB-TXQT is PixArt Imaging's latest optical navigation chip designed with far field optics technology that enables navigation in the air. It is housed in a 28-pin chip-on-board (COB) package that provides X-Y motion information with a wide working range of 80 mm to infinity. It is most suitable for far field applications for motion detection.
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+Key Features
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+- Wide working range from 80 mm to infinity
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+- No lens focusing required during lens mounting process
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+- Power consumption of <9mA @ run mode
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+- 16-bit motion data registers
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+- Motion detect pin output
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+- Internal oscillator – no clock input needed
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+
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+Applications
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+Devices that require far field motion detection, e.g.
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+- Drone
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+- Indoor and outdoor X-Y positioning, especially in GPS-
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+https://download.kamami.pl/p587092-pmw3901mb-txqt_-_productbrief_2451186_7.pdf
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+The PMW3901 is a crafty little sensor that uses a low-resolution camera and some clever algorithms to detect motion of surfaces. A great use for it is detecting and correcting for drift of a drone by looking for x/y motion of the ground below.
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+## raspberry pi
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+Our library is set up to use SPI 0 on the Pi: BCM 8 for CS, BCM 11 for SCK, BCM 10 for MOSI, BCM 9 for MISO, and BCM 18 for the INT pin.
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+Here's which pins to connect between your Optical Flow Sensor Breakout and your Pi's GPIO (note that it's BCM pin numbering):
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+- 3-5V to any 5V or 3V pin
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+- CS to BCM 8
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+- SCK to BCM 11
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+- MOSI to BCM 10
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+- MISO to BCM 9
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+- INT to BCM 18
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+- GND to any ground pin
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+
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+## library code
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+- python == https://github.com/pimoroni/pmw3901-python
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+
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+
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+## ref
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+
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+- [[pixart-dat]]
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Chip-dat/pixART-dat/pixART-dat.md
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+# pixART-dat
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+
Tech-dat/Sensor-dat/sensor-dat.md
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- Biosensors (e.g., Glucose Sensors)
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+
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+## Barometer for FPV Indoor Hovering
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+
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+### ✅ What works
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+- Barometer measures **air pressure** → estimates altitude.
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+- Indoors, it can detect vertical movement and stabilize height.
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+- If Mobula8 flight controller has a baro, Betaflight/INAV can enable **Altitude Hold**.
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+
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+### ⚠️ Limitations Indoors
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+1. **Air pressure fluctuations**
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+ - Fans, air conditioning, or doors opening can confuse baro.
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+2. **Ground effect**
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+ - Prop wash near the floor disturbs readings.
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+3. **No position hold**
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+ - Baro only helps with *up/down*, not sideways drift.
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+
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+### 🚀 Better Indoor Hovering Solutions
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+- **Optical Flow sensor (PMW3901)** → reduces drift.
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+- **Ultrasonic / LiDAR sensor** → more accurate low-altitude hold.
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+- **Angle Mode + Throttle Curve** → simplest option for smooth hover.
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+
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+### 👉 Conclusion
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+- Barometer can help indoors, but not very stable.
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+- For DJI-like hands-free hover, you need **optical flow** (indoor) or **GPS** (outdoor). - [[sensor-optical-flow-dat]]
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+- Manual tuning in Angle Mode is usually best for Mobula8.
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## ref
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- [[sensor]]
Tech-dat/Sensor-dat/sensor-motion-dat/sensor-optical-flow-dat/sensor-optical-flow-dat.md
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+# sensor-optical-flow-dat
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+Optical flow sensor (e.g. PMW3901 module) → helps with drift correction indoors.
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+- [[PMW3901-dat]]
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+## ref
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+
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+- [[sensor-optical-flow]] - [[sensor-motion]] - [[sensor]]
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Tech-dat/acturator-dat/motor-dat/motor-dat.md
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- [[shaft-coupler-dat]]
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+## Using Lower KV Motors on Mobula8
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+### 1. What KV Means
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+- KV = Motor RPM per volt (without load)
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+- Higher KV → faster motor spin → more aggressive flight
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+- Lower KV → slower spin → smoother, more controllable flight
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+
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+---
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+### 2. Advantages of Lower KV Motors
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+- **Smoother indoor flight:** Slower response makes hovering and gentle maneuvers easier
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+- **Less vibration:** Easier to tune PID for stable flight
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+- **Lower heat & power draw:** Motors and ESCs run cooler, extending life
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+- **Longer flight time:** Less energy wasted on high-speed spinning
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+
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+---
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+
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+### 3. Disadvantages / Considerations
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+- **Less thrust:** Mobula8 might struggle with fast flips or aggressive maneuvers
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+- **Battery voltage match:** Lower KV may require slightly higher voltage (2S→3S) to maintain comparable thrust
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+- **Propeller size & pitch:** Lower KV works better with slightly larger or higher-pitch props, but Mobula8 frame limits size
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+
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+---
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+
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+### 4. Practical Notes
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+- Stock Mobula8 motors: **EX1103 KV11000**
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+- Lower KV options: **KV9000–KV10000** for smoother indoor flight
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+- ESCs must handle motor current; check your 4A–5A rating is sufficient
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+
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+---
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+### 5. Summary
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+- ✅ **Indoor/cinematic flying:** Lower KV preferred
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+- ⚠️ **Freestyle/acro flying:** Might reduce agility
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+- Adjust **PID and throttle curves** in Betaflight after motor swap
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## ref
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- [[acturator-dat]]
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app-dat/RC-dat/FPV-dat/FPV-dat.md
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- [[ELRS-dat]] - [[FrSky-dat]] - [[ArduPilot-dat]] - [[CRSF-dat]]
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-- [[FPV-controller-dat]] - [[Goggles-dat]] - [[BMS-dat]] - [[camera-dat]] - [[VTX-dat]] - [[flight-controller-dat]] - [[ESC-dat]] - [[motor-dat]] - [[propeller-dat]]
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+- [[FPV-controller-dat]] - [[BMS-dat]] - [[camera-dat]] - [[VTX-dat]] - [[flight-controller-dat]] - [[ESC-dat]] - [[motor-dat]] - [[propeller-dat]]
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- [[RC-controller-dat]]
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- [[FPV]]
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-- [[battery-pack-dat]]
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+- [[battery-pack-dat]] - [[power-dat]]
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+
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+- [[sensor-dat]]
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## The best overall FPV drone Starting Kit
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app-dat/RC-dat/FPV-dat/Goggles-dat/2025-09-04-15-39-13.png
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app-dat/RC-dat/FPV-dat/Goggles-dat/Goggles-dat.md
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- [[DJI-dat]] - [[fat-shark-dat]] - [[sky-zone-dat]]
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+- [[walksnail-dat]]
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+- GogglesX
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+- Goggles L
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+## Features
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- eye view == 155 degree
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- fly speed == 27M/s
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- battery
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+## mechanical Gimbal
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+- GM1
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+- GM2
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+- GM3
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+![](2025-09-04-15-39-13.png)
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## Rotorama 008D Pro
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power-dat/power-dat.md
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![](2025-08-07-14-48-23.png)
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+## Integrated PDB (Power Distribution Board)
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+An **Integrated PDB** is a circuit board built **into a drone’s flight controller or frame** that distributes power from the battery to all electronic components, such as:
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+- ESCs (Electronic Speed Controllers)
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+- Motors
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+- Flight Controller (FC)
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+- Video Transmitter (VTX)
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+- LEDs and other accessories
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## ref
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- [[power]]
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