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esp32:esp32_main [2020/10/13 19:52] admin [Espressif ESP32 Development Board] |
esp32:esp32_main [2020/11/17 16:01] (current) admin [DAC and ADC] |
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=== Special Hardware Configuration ==== | === Special Hardware Configuration ==== | ||
- | ** The I/O pins are not 5V-tolerant! ** Use 3.3V instead.\\ | + | ** The I/O pins are not 5V-tolerant! **\\ |
- | The build in LED is on Pin 2.\\ | + | Use 3.3V instead.\\ |
- | Pin 34 - 39 are input only. And don't have a software pull-up or pull-down functions. One has to use an external 10k pull-up resistor. | + | \\ |
- | [[https:// | + | The build in LED is on GPIO 2.\\ |
+ | \\ | ||
+ | GPIO 34, 35, 36, 37, 38 and 39 are input only. And don't have a software pull-up or pull-down functions. One has to use an external 10k pull-up resistor.\\ | ||
+ | \\ | ||
+ | GPIO 6, 7, 8, 9, 10 and 11 are used for the SPI flash chip and can't be used for any other purposes.\\ | ||
---- | ---- | ||
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[[https:// | [[https:// | ||
[[https:// | [[https:// | ||
+ | |||
+ | ---- | ||
+ | ===== DAC and ADC ===== | ||
+ | |||
+ | **ADC**\\ | ||
+ | | ||
+ | | ||
+ | |||
+ | | ||
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+ | | ||
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+ | | ||
+ | ADC_0db: sets no attenuation (1V input = ADC reading of 1088). | ||
+ | ADC_2_5db: sets an attenuation of 1.34 (1V input = ADC reading of 2086). | ||
+ | ADC_6db: sets an attenuation of 1.5 (1V input = ADC reading of 2975). | ||
+ | ADC_11db: sets an attenuation of 3.6 (1V input = ADC reading of 3959). | ||
+ | | ||
+ | | ||
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+ | | ||
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+ | |||
+ | taken from: [[https:// | ||
+ | |||
+ | ---- | ||
+ | **DAC**\\ | ||
+ | The ESP32 has two DAC pins, GPIO25 and GPIO26. The resolution is 8 bits.\\ | ||
+ | | ||
+ | For generating a sine wave one finds a good manual here: [[https:// | ||
+ | |||
---- | ---- | ||