Search found 308 matches
- Wed Jun 20, 2018 8:08 am
- Forum: ESP-IDF
- Topic: ADC1 on Adafruit Feather HUZZAH-ESP32 doesn't work with esp-idf
- Replies: 7
- Views: 10210
Re: ADC1 on Adafruit Feather HUZZAH-ESP32 doesn't work with esp-idf
You can probably also remove any GPIO calls in your code, because calls to adc1_config_channel_atten() and adc2_config_channel_atten() will already configure the necessary GPIOs.
- Wed Jun 20, 2018 3:42 am
- Forum: ESP-IDF
- Topic: ADC1 on Adafruit Feather HUZZAH-ESP32 doesn't work with esp-idf
- Replies: 7
- Views: 10210
Re: ADC1 on Adafruit Feather HUZZAH-ESP32 doesn't work with esp-idf
When I run the code above on the EPS32 Wrover Kit, the results are inverted (where connecting an A1_x channel to GND results in a reading of 4095, and connecting to HIGH results in 0). I think there might be something wrong with your ADC and GPIO configuration code. I've modified the example as foll...
- Mon Mar 19, 2018 3:46 am
- Forum: ESP32 Arduino
- Topic: ESP32 ADC Non-linear Issues - How do I fix / change Attenuation or width?
- Replies: 43
- Views: 130506
Re: ESP32 ADC Non-linear Issues - How do I fix / change Attenuation or width?
Please contact the sales team at sales@espressif.com, they can help with this questionvseven wrote:Can you comment if there will there be a revision number or indication printed on the chips that have this new factory calibration
- Tue Jan 23, 2018 7:18 pm
- Forum: Hardware
- Topic: About the CAN controller.
- Replies: 175
- Views: 310989
Re: About the CAN controller.
C does not allow initialization of arrays and structures after declaration, therefore the following will not compile //Does not compile CAN_frame_t my_frame; my_frame.data.u8 = {1 ,2 ,3 ,4 ,5 ,6, 7, 8}; CAN_frame_t my_frame = {0 , 0 , 33, 4, 255, 255, 255, 254, 123, 77}; The reason this works is bec...
- Mon Jan 08, 2018 8:29 am
- Forum: Hardware
- Topic: About the CAN controller.
- Replies: 175
- Views: 310989
Re: About the CAN controller.
The CAN output control register doesn't actually exist as the ESP32 CAN peripheral only consists of the controller portion and requires an external transceiver functionality. One of the likely causes of the ESP32 not outputting anything during transmission could be due to the RX pin not being able t...
- Sun Dec 31, 2017 11:06 am
- Forum: Hardware
- Topic: ESP32 ADC Calibration curves?
- Replies: 18
- Views: 35732
Re: ESP32 ADC Calibration curves?
Please take a look at the following link
https://esp-idf.readthedocs.io/en/lates ... alibration
Calibration for 11db attenuation is not very good as 11db attenuation does not have a linear response. Adding a 0.1uf capacitor can also help with the noise.
https://esp-idf.readthedocs.io/en/lates ... alibration
Calibration for 11db attenuation is not very good as 11db attenuation does not have a linear response. Adding a 0.1uf capacitor can also help with the noise.
- Tue Oct 31, 2017 6:45 am
- Forum: ESP32 Arduino
- Topic: ESP32 ADC Non-linear Issues - How do I fix / change Attenuation or width?
- Replies: 43
- Views: 130506
Re: ESP32 ADC Non-linear Issues - How do I fix / change Attenuation or width?
Hi everyone, the ADC calibration issue has actually been addressed in the esp-idf. Please see https://esp-idf.readthedocs.io/en/latest/api-reference/peripherals/adc.html#adc-calibration and https://github.com/espressif/esp-idf/tree/4048db35b6a1ac4216150480dcacdc4230f0baa2/components/esp_adc_cal . Es...
- Fri Jun 02, 2017 7:44 am
- Forum: Hardware
- Topic: WROVER and RGB LED
- Replies: 21
- Views: 31026
Re: WROVER and RGB LED
I've been able to control each RGB LED individually with no issue. I've also tried every permutation of turning the RGB LEDs On/Off with no issue as well.