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unleashed-firmware/applications/examples/example_thermo/README.md
あく 0d8518d31d
[FL-3232] FuriHal: fix gpio naming and add explicit pulls for vibro, speaker and ir_tx (#2565) 
* FuriHal: fix gpio naming and add explicit pulls for vibro, speaker and ir_tx
* Github: workflow event debug print
* Github: proper PR head commit SHA extraction in get_env.py
2023-04-06 19:06:19 +10:00

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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_app 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:

/* 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.