kopia lustrzana https://github.com/espressif/esp-idf
1.2 KiB
1.2 KiB
| 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