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43 lines
1.2 KiB
Markdown
43 lines
1.2 KiB
Markdown
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| Supported Targets | ESP32-S2 |
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| ----------------- | -------- |
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# ULP-RISC-V DS18B20 Temperature Sensor OneWire Communication
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This example demonstrates how to program the ULP-RISC-V co-processor to read temperature from a [DS18B20](https://datasheets.maximintegrated.com/en/ds/DS18B20.pdf) temperature sensor over 1-Wire.
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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.
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### Hardware Required
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* A development board with a SOC which has a RISC-V ULP coprocessor (e.g., ESP32-S2 Saola)
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* A USB cable for power supply and programming
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* A DS18B20 temperature sensor
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Example connection :
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| ESP Dev-kit | DS18B20 |
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| ------------ | ------- |
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| GPIO4 | DQ |
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| VCC 3.3V | VDD |
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| GND | GND |
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## Example output
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```
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Not a ULP wakeup, initializing it!
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Entering in deep sleep
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...
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ULP-RISC-V woke up the main CPU, temperature is above set limit!
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ULP-RISC-V read temperature is 32.562500
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Entering in deep sleep
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...
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ULP-RISC-V woke up the main CPU, temperature is above set limit!
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ULP-RISC-V read temperature is 33.000000
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Entering in deep sleep
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```
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