2018-11-30 17:31:47 +08:00
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# GPIO
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2018-12-04 15:00:14 +08:00
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[中文](/zh_CN/api_reference/micropython/peripherals/api_gpio) | [English](/en/api_reference/micropython/peripherals/api_gpio) | 日本語
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2018-11-30 17:31:47 +08:00
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*Refer to GPIO API of [Arduino](http://www.arduino.cc)*
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### <mark>digitalRead</mark>
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> uint32 digitalRead(uint8 pin);
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Read the value of `pin`
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| Param | Type | Description |
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| --- | --- | --- |
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| pin | <code>uint8</code> | the number of pin |
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Return:
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digital level(0/1)
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**Example**
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```c++
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uint32_t pin21_data;
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pin21_data = digitalRead(21);
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```
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