# dht-logger
Read DHT sensor data formatted in JSON over a serial interface and log it.
This crate is still under development and is not stable.
This crate is for logging measurement from a device reading DHT sensors and
writing the measurements over a serial connection. The hardware producing the
data does not matter, but it must be logging data over serial in JSON with
fields for temperature, humidity, and heat index. Here's a pretty version of an
example reading:
```json
{
"sensor_label": {
"t": 20.0,
"h": 50.0,
"hi": 20.0
},
"another_sensor": {
"error": "some error message"
}
}
```
This code has been tested using
[arduino-dht-logger](https://github.com/domagalski/arduino-dht-logger) as the
hardware source providing data over serial.
## Example
The following example creates a DHT logger from a configuration file, then
reads data from the serial port and logs it to whatever logging channels are
configured.
```rust
use std::path::Path;
use dht_logger::DhtLogger;
let config_path = Path::new("example_config.yaml");
let config = DhtLoggerConfig::load_yaml(config_path);
let logger = DhtLogger::from_config(&config);
logger.read_sensor_and_log_data(10);
```
## Cross compiling for the Raspberry Pi
The cross-compilation procedure for Raspberry Pi is modified from
[rust-embedded/cross](https://github.com/rust-embedded/cross) as libudev-dev is
required for compilation, which isn't in the default docker images cross
provides. Currently the Raspberry Pi Zero and 4B models are supported. To set
up the cross-compilation for both the 4B and zero, run the bootstrap script:
```
./bootstrap.sh
```
After `./bootstrap.sh` is finished, the `build.sh` script can be run with
either `4b` or `zero` as the arguments to determine the target.