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When using USB-serial-jtag for monitoring idf-monitor will lose connection during deep sleep (because the peripheral powers down) and will need some time to reconnect when we wake-up. In the ULP examples this would result in the chip waking up->printing-> going back to sleep, before idf-monitor is even able to connect, and users would erroneously assume the chip never woke up. Add a 1 sec delay at the start of the examples to improve the user experience when using jtag-serial. |
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| .. | ||
| main | ||
| CMakeLists.txt | ||
| README.md | ||
| sdkconfig.defaults | ||
| Supported Targets | ESP32-S2 |
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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