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Currently, several example dependencies rely on the fact that all registered components are added to the build, along with components specified in common requirements. This results in longer build times because even unused components must be built. Switch all examples to use idf_minimal_build to compile only the components actually required by the example. Signed-off-by: Frantisek Hrbata <frantisek.hrbata@espressif.com>
| Supported Targets | ESP32-S2 |
|---|
ULP-RISC-V DS18B20 Temperature Sensor OneWire Communication
This example demonstrates how to program the ULP-RISC-V co-processor to read temperature from a DS18B20 temperature sensor over 1-Wire. When the measurement exceeds the limit set(32.5 degrees) the co-processor will wake up the main CPU from deep-sleep and the main CPU will print the temperature measurement.
Hardware Required
- A development board with a SOC which has a RISC-V ULP coprocessor (e.g., ESP32-S2 Saola)
- A USB cable for power supply and programming
- A DS18B20 temperature sensor
Example connection :
| ESP Dev-kit | DS18B20 |
|---|---|
| GPIO4 | DQ |
| VCC 3.3V | VDD |
| GND | GND |
Example output
Not a ULP wakeup, initializing it!
Entering in deep sleep
...
ULP-RISC-V woke up the main CPU, temperature is above set limit!
ULP-RISC-V read temperature is 32.562500
Entering in deep sleep
...
ULP-RISC-V woke up the main CPU, temperature is above set limit!
ULP-RISC-V read temperature is 33.000000
Entering in deep sleep