7a3a1aaf0d
* Add 1-wire thermometer example app stub * Working 1-wire thermometer app * Refactor app to use threads * Clean up code, add comments * Add CRC checking * Increase update period * Fix error in fbt * Revert the old update period * Use settable pin in onewire_host * Use settable pin for onewire_slave * Clear EXTI flag after callback, make private methods static in onewire_slave * Do not hardcode GPIO pin number * Remove iButton hal from furi_hal_rfid * Remove most of furi_hal_ibutton * Add some of furi_hal_ibutton back * Slightly neater code * Fix formatting * Fix PVS-studio warnings * Update CODEOWNERS * Add furi_hal_gpio_get_ext_pin_number * Create README.md * FuriHal: move furi_hal_gpio_get_ext_pin_number to resources --------- Co-authored-by: Aleksandr Kutuzov <alleteam@gmail.com>
1.4 KiB
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:
- Make sure your Flipper has an SD card installed.
- Connect your Flipper to the computer via a USB cable.
- Run
./fbt launch_app APPSRC=example_thermoin 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:
/* 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
- ibutton_gpio
*/
#define THERMO_GPIO_PIN (ibutton_gpio)
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.