unleashed-firmware/applications/examples/example_thermo/README.md
hedger 309f65e401
[FL-3437] fbt: build target for faps (#2888)
* fbt: added build target for faps. Usage: ./fbt build APPSRC=<appid>
* Updated docs & vscode config
* Code cleanup
2023-07-18 13:39:30 +04:00

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# 1-Wire Thermometer
This example application demonstrates the use of the 1-Wire library with a DS18B20 thermometer.
It also covers basic GUI, input handling, threads and localisation.
## Electrical connections
Before launching the application, connect the sensor to Flipper's external GPIO according to the table below:
| DS18B20 | Flipper |
| :-----: | :-----: |
| VDD | 9 |
| GND | 18 |
| DQ | 17 |
*NOTE 1*: GND is also available on pins 8 and 11.
*NOTE 2*: For any other pin than 17, connect an external 4.7k pull-up resistor to pin 9.
## Launching the application
In order to launch this demo, follow the steps below:
1. Make sure your Flipper has an SD card installed.
2. Connect your Flipper to the computer via a USB cable.
3. Run `./fbt launch APPSRC=example_thermo` in your terminal emulator of choice.
## Changing the data pin
It is possible to use other GPIO pin as a 1-Wire data pin. In order to change it, set the `THERMO_GPIO_PIN` macro to any of the options listed below:
```c
/* Possible GPIO pin choices:
- gpio_ext_pc0
- gpio_ext_pc1
- gpio_ext_pc3
- gpio_ext_pb2
- gpio_ext_pb3
- gpio_ext_pa4
- gpio_ext_pa6
- gpio_ext_pa7
- gpio_ibutton
*/
#define THERMO_GPIO_PIN (gpio_ibutton)
```
Do not forget about the external pull-up resistor as these pins do not have one built-in.
With the changes been made, recompile and launch the application again.
The on-screen text should reflect it by asking to connect the thermometer to another pin.