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https://github.com/carletonurocketry/fetcher
A QNX process for fetching data from sensors over I2C.
https://github.com/carletonurocketry/fetcher
c cli cli-tool cuinspace modular posix process qnx qnx-neutrino raspberry-pi-4 sensors sensors-data-collection unix
Last synced: 2 months ago
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A QNX process for fetching data from sensors over I2C.
- Host: GitHub
- URL: https://github.com/carletonurocketry/fetcher
- Owner: CarletonURocketry
- License: gpl-3.0
- Created: 2023-10-17T13:01:02.000Z (about 1 year ago)
- Default Branch: main
- Last Pushed: 2024-05-22T00:30:57.000Z (7 months ago)
- Last Synced: 2024-05-22T20:36:39.919Z (7 months ago)
- Topics: c, cli, cli-tool, cuinspace, modular, posix, process, qnx, qnx-neutrino, raspberry-pi-4, sensors, sensors-data-collection, unix
- Language: C
- Homepage: https://carletonurocketry.github.io/fetcher/
- Size: 981 KB
- Stars: 1
- Watchers: 3
- Forks: 0
- Open Issues: 6
-
Metadata Files:
- Readme: README.md
- Contributing: .github/CONTRIBUTING.md
- License: LICENSE
- Codeowners: .github/CODEOWNERS
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README
# fetcher
A process for fetching data from sensors using the I2C protocol.
## Usage
See the help documentation with the command: `use fetcher`.
The output of fetcher looks like:
```console
Time: 1295 ms
Temperature: 25.02 C
Pressure: 99.94 kPa
...
```
Sensor data output can either be printed in plain-text, or it can be read from the named message queue
`fetcher/sensors`.
Messages on the message queue start with a one-byte type specifier which is one of the following:
```c
/** Describes possible data types that fetcher is capable of producing. */
typedef enum {
TAG_TEMPERATURE = 0, /**< Temperature in degrees Celsius */
TAG_PRESSURE = 1, /**< Pressure in kilo Pascals */
TAG_HUMIDITY = 2, /**< Humidity in % relative humidity */
TAG_TIME = 3, /**< Time in milliseconds */
TAG_ALTITUDE_SEA = 4, /**< Altitude above sea level in meters */
TAG_ALTITUDE_REL = 5, /**< Altitude above launch height in meters */
TAG_ANGULAR_VEL = 6, /**< Angular velocity in degrees per second */
TAG_LINEAR_ACCEL_REL = 7, /**< Relative linear acceleration in meters per second squared */
TAG_LINEAR_ACCEL_ABS = 8, /**< Absolute linear acceleration in meters per second squared */
} SensorTag;
```
Followed by data representing the measurement.
Temperature, pressure, humidity and altitude are floats.
Time is a 32 bit integer.
Linear acceleration and angular velocity are 3D vectors (`vec3d_t`) of 3 floats.
## Board ID EEPROM Encoding
In order for fetcher to recognize the sensors on the board, the EEPROM must encode the ID in this format:
```
CU InSpace
REV :
```
**Fields:**
- ``: The name of the board. Ex: `Sensor board`
- `REV `: The revision of the board. Ex: `REV B`
- ``: The identifier of the sensor. Ex: `MS5611`
- `
`: The 7 bit I2C address of the sensor in hexadecimal (without the leading 0x). Ex: `77`
- It is possible to have more than one address per sensor type for boards with duplicates
[packager]: https://github.com/CarletonURocketry/packager