Chip-dat/Nordic-dat/NRF52840-dat/NRF52840-dat.md
... ...
@@ -117,7 +117,11 @@
117 117
118 118
## solutions
119 119
120
-- [[NRF52840+SX1262-dat]]
120
+- [[NRF52840+SX1262-dat]] - [[lora-dat]] - [[bluetooth-dat]]
121
+
122
+
123
+
124
+
121 125
122 126
## NRF52840 SCH
123 127
Chip-dat/bosch-dat/BNO055-dat/2026-02-05-20-25-27.png
... ...
Binary files /dev/null and b/Chip-dat/bosch-dat/BNO055-dat/2026-02-05-20-25-27.png differ
Chip-dat/bosch-dat/BNO055-dat/BNO055-dat.md
... ...
@@ -0,0 +1,51 @@
1
+
2
+# BNO055-dat
3
+
4
+
5
+- [[9-axis-IMU-dat]] - [[bosch-dat]]
6
+
7
+- [[logic-level-shifter-dat]]
8
+
9
+
10
+Data Output
11
+The BNO055 can output the following sensor data:
12
+
13
+- Absolute Orientation (Euler Vector, 100Hz)
14
+Three axis orientation data based on a 360° sphere
15
+
16
+- Absolute Orientation (Quaterion, 100Hz)
17
+Four point quaternion output for more accurate data manipulation
18
+
19
+- Angular Velocity Vector (100Hz)
20
+Three axis of 'rotation speed' in rad/s
21
+
22
+- Acceleration Vector (100Hz)
23
+Three axis of acceleration (gravity + linear motion) in m/s^2
24
+
25
+- Magnetic Field Strength Vector (20Hz)
26
+Three axis of magnetic field sensing in micro Tesla (uT)
27
+
28
+- Linear Acceleration Vector (100Hz)
29
+Three axis of linear acceleration data (acceleration minus gravity) in m/s^2
30
+
31
+- Gravity Vector (100Hz)
32
+Three axis of gravitational acceleration (minus any movement) in m/s^2
33
+
34
+- Temperature (1Hz)
35
+Ambient temperature in degrees celsius
36
+
37
+The BNO055 is a smart sensor implementing an intelligent 9-axis absolute orientation sensor, which includes sensors and sensor fusion in a single package.
38
+
39
+- 9DoF sensor
40
+- Integrated MCU and Flash
41
+- Integrated sensor data fusion
42
+
43
+
44
+## SCH
45
+
46
+![](2026-02-05-20-25-27.png)
47
+
48
+
49
+## ref
50
+
51
+- [[bosch-dat]]
Circuits-dat/logic-dat/Logic-level-shifter-dat/2026-02-05-20-24-24.png
... ...
Binary files /dev/null and b/Circuits-dat/logic-dat/Logic-level-shifter-dat/2026-02-05-20-24-24.png differ
Circuits-dat/logic-dat/Logic-level-shifter-dat/Logic-level-shifter-dat.md
... ...
@@ -75,6 +75,13 @@ Make sure the VCCA ≤VCCB.
75 75
76 76
![](2026-01-19-13-32-16.png)
77 77
78
+
79
+general 5V-3V3 logic
80
+
81
+![](2026-02-05-20-24-24.png)
82
+
83
+
84
+
78 85
- [[arduino-dat]] to 3.3V [[location-dat]] == [[SPI-dat]]
79 86
80 87
![](2026-01-19-13-32-40.png)
Network-dat/Bluetooth-dat/bluetooth-dat.md
... ...
@@ -79,6 +79,14 @@ demo video
79 79
80 80
- [[iBeacon-dat]]
81 81
82
+- [[NRF52840+SX1262-dat]] - [[lora-dat]] - [[bluetooth-dat]]
83
+
84
+- [[head-track-dat]]
85
+
86
+
87
+
88
+
89
+
82 90
83 91
## Chip
84 92
Network-dat/RF-dat/LORA-DAT/Lora-dat.md
... ...
@@ -180,6 +180,10 @@ https://github.com/dragino/Lora
180 180
181 181
182 182
183
+## build apps
184
+
185
+- [[NRF52840+SX1262-dat]] - [[lora-dat]] - [[bluetooth-dat]]
186
+
183 187
184 188
## ref
185 189
Tech-dat/Sensor-dat/sensor-motion-dat/9-axis-IMU-dat/9-axis-IMU-dat.md
... ...
@@ -2,6 +2,11 @@
2 2
# 9-axis-IMU-dat.md
3 3
4 4
5
+
6
+
7
+
8
+
9
+## info
5 10
- [[6-axis-dat]] + - [[3-Axis-Magnetic-dat]]
6 11
7 12
... ...
@@ -26,7 +31,30 @@ LSM9DS1 9 Axis, Gyrometer, Accelerometer and Magnetometer
26 31
27 32
The [[ITG320-dat]] (often paired as ITG3205) refers to a MEMS gyroscope IC, commonly found on the GY-85 sensor module, which integrates a 3-axis gyro (ITG3205), a 3-axis accelerometer ([[ADXL345-dat]]), and a 3-axis magnetometer ([[HMC5883L-dat]]) into a single 9-Degrees-of-Freedom (9DOF) Inertial Measurement Unit (IMU) for motion sensing in electronics projects, communicating via I2C.
28 33
34
+## AHRS VS IMU
35
+
36
+An AHRS (Attitude and Heading Reference System) sensor integrates 3-axis gyroscopes, accelerometers, and magnetometers to provide precise 3D orientation (pitch, roll, and yaw) for drones, robotics, and aircraft. These MEMS-based devices use sensor fusion algorithms (e.g., Kalman filters) to calculate orientation and correct for drift.
37
+
38
+Key Features and Functions
39
+- 3D Orientation: Provides real-time data on pitch, roll, and heading (yaw).
40
+- Sensor Fusion: Combines raw data from a 3-axis gyroscope (rate of rotation), 3-axis accelerometer (linear acceleration/gravity), and 3-axis magnetometer (magnetic north).
41
+- Drift Correction: Uses algorithms to compensate for errors in individual sensors, reducing long-term inaccuracies.
42
+- High-Rate Output: Delivers stable, dynamic orientation data, often used in autopilot and stabilization systems.
43
+
44
+Components of an AHRS
45
+- Gyroscope: Measures angular velocity to track fast movements.
46
+- Accelerometer: Measures gravitational force when stationary to determine tilt (pitch/roll).
47
+- Magnetometer: Acts as a digital compass to determine heading (yaw).
48
+
49
+Applications
50
+- Aviation: Provides solid-state, reliable attitude info to replace traditional mechanical gyros.
51
+- Robotics & UAVs: Used for stabilization, navigation, and controlling unmanned vehicles.
52
+- Marine: Used as a Motion Reference Unit (MRU) for navigation and maritime applications.
53
+
54
+
55
+### AHRS vs. IMU
29 56
57
+While an Inertial Measurement Unit (IMU) only outputs raw data (acceleration/angular rate), an AHRS uses on-board processing to calculate and output actual orientation data (quaternions or Euler angles).
30 58
31 59
32 60
## app
Tech-dat/tech-dat.md
... ...
@@ -264,7 +264,7 @@
264 264
265 265
## chips
266 266
267
-- [[chip-dat]] - [[TI-dat]] - [[analog-device-dat]] - [[silicon-labs-dat]] - [[onsemi-dat]] - [[maxlinear-dat]] - [[microchip-dat]]
267
+- [[chip-dat]] - [[TI-dat]] - [[analog-device-dat]] - [[silicon-labs-dat]] - [[onsemi-dat]] - [[maxlinear-dat]] - [[microchip-dat]] - [[nordic-dat]] - [[bosch-dat]]
268 268
269 269
- [[chip-cn-dat]]
270 270