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esp32:esp32_main [2018/04/17 19:34] admin |
esp32:esp32_main [2020/11/17 16:01] (current) admin [DAC and ADC] |
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[[https:// | [[https:// | ||
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[[https:// | [[https:// | ||
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{{: | {{: | ||
+ | |||
+ | ---- | ||
+ | ===== Serial to USB Driver ===== | ||
+ | |||
+ | - [[https:// | ||
+ | - [[https:// | ||
---- | ---- | ||
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</ | </ | ||
- | === Upload a Scetch | + | === Upload a Sketch |
The Examples for the ESP32 become visible after selecting **ESP32 DEV MODULE** in the Arduino IDE.\\ | The Examples for the ESP32 become visible after selecting **ESP32 DEV MODULE** in the Arduino IDE.\\ | ||
- | Set the flashing speed to 460800 or lower.\\ | + | Set the flashing speed to 460800 or lower (115200).\\ |
- | Upload your scetch.\\ | + | Upload your sketch.\\ |
It could be necessary to start the IDE with administrator rights, too.\\ | It could be necessary to start the IDE with administrator rights, too.\\ | ||
+ | |||
+ | ---- | ||
+ | === Special Hardware Configuration ==== | ||
+ | |||
+ | ** The I/O pins are not 5V-tolerant! **\\ | ||
+ | Use 3.3V instead.\\ | ||
+ | \\ | ||
+ | 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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---- | ---- | ||
+ | ==== Adafruit HUZZAH32 – ESP32 Feather Board ==== | ||
+ | |||
+ | [[https:// | ||
+ | [[https:// | ||
+ | |||
+ | ---- | ||
+ | ===== DAC and ADC ===== | ||
+ | |||
+ | **ADC**\\ | ||
+ | | ||
+ | | ||
+ | |||
+ | | ||
+ | | ||
+ | | ||
+ | | ||
+ | | ||
+ | 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). | ||
+ | | ||
+ | | ||
+ | | ||
+ | | ||
+ | | ||
+ | |||
+ | 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:// | ||
+ | |||
+ | ---- | ||
+ |