Search found 75 matches
- Fri May 07, 2021 8:29 pm
- Forum: Hardware
- Topic: Pulling up IO12 prevents proper boot up
- Replies: 2
- Views: 3483
Re: Pulling up IO12 prevents proper boot up
Thanks! I had seen some gpio_isolate code about gpio 12 but not this.
- Fri May 07, 2021 7:59 pm
- Forum: Hardware
- Topic: Input-only pin GPIO36 sources current (backpower)
- Replies: 3
- Views: 3096
Input-only pin GPIO36 sources current (backpower)
I have GPIO36 attached to an LED and a 1K resistor to GND. GPIO36 is configured as input. The LED is supposed to be switched on by another circuit. But the diode light up and stays on. It goes off if I hold down reset and also off if I add a diode to prevent reverse current. So it's definitely the p...
- Fri May 07, 2021 7:50 pm
- Forum: Hardware
- Topic: Pulling up IO12 prevents proper boot up
- Replies: 2
- Views: 3483
Pulling up IO12 prevents proper boot up
I have an ESP32WRROM and have connected IO2 to a button which pulls up the GPIO when you press the button. If I hold the button and reset the esp32, I get the following error on repeat until I let go of GPIO12. rst:0x1 (POWERON_RESET),boot:0x33 (SPI_FAST_FLASH_BOOT) flash read err, 1000 ets_main.c 3...
- Wed Nov 11, 2020 3:28 pm
- Forum: General Discussion
- Topic: WiFi/Internet KeepAlive - How to property maintain network connection without reboots?
- Replies: 2
- Views: 4111
Re: WiFi/Internet KeepAlive - How to property maintain network connection without reboots?
thanks @Gardin In their code, they retry a few times and then give up: if (event_base == WIFI_EVENT && event_id == WIFI_EVENT_STA_DISCONNECTED) {if (s_retry_num < EXAMPLE_ESP_MAXIMUM_RETRY) {esp_wifi_connect();s_retry_num++;ESP_LOGI(TAG, "retry to connect to the AP");} else {xEventGroupSetBits(s_wif...
- Tue Nov 10, 2020 12:58 am
- Forum: General Discussion
- Topic: WiFi/Internet KeepAlive - How to property maintain network connection without reboots?
- Replies: 2
- Views: 4111
WiFi/Internet KeepAlive - How to property maintain network connection without reboots?
My application easily connects to the WiFi AP and the AWS IOT endpoint. This is all good, but after a few days, the device can lose wifi or IOT connection (due to power, or internet outage, AP not being always on, etc). The docs suggests that it is up to the "application" to maintain connectivity. W...
- Mon Sep 14, 2020 4:15 pm
- Forum: Hardware
- Topic: how do you protect the ADC pin from battery reverse polarity?
- Replies: 1
- Views: 2442
how do you protect the ADC pin from battery reverse polarity?
I use the ESP32 ADC to measure the battery voltage. The board has a battery boost ic which takes the voltage of the two AAs to 3.3V for ESP32. The issue is that if the batteries are inserted backwards, the VCC will not be connected, but the ADC input pin which is connected to the battery terminal wi...
- Mon Jun 01, 2020 6:00 pm
- Forum: General Discussion
- Topic: Automatic Light Sleeping during long spi transactions and Gpio states
- Replies: 1
- Views: 2930
Automatic Light Sleeping during long spi transactions and Gpio states
ePaper panels have a fairly long update delays (1 to > 4 seconds). It would be nice conserve power during the wait. When I enable automatic light sleep, esp32 is no longer able to communicate with the ePaper panel. My guess is that the GPIO pins either float during sleep or go to 0 including the res...
- Fri May 29, 2020 8:00 pm
- Forum: General Discussion
- Topic: IDF 4.0 light sleep and maintaining WiFi AP connection
- Replies: 2
- Views: 4214
Re: IDF 4.0 light sleep and maintaining WiFi AP connection
@WiFive, Thank you!https://docs.espressif.com/projects/esp ... leep-modes
Automatic light_sleep did the trick.
- Thu May 28, 2020 9:27 pm
- Forum: General Discussion
- Topic: IDF 4.0 light sleep and maintaining WiFi AP connection
- Replies: 2
- Views: 4214
IDF 4.0 light sleep and maintaining WiFi AP connection
My app was able to stay WiFi connected to the AP without issues until I added periodic light_sleep for power saying. Essentially the same code presented in the light_sleep example: https://github.com/espressif/esp-idf/blob/master/examples/system/light_sleep/main/light_sleep_example_main.c /* Enter s...
- Thu May 28, 2020 8:50 pm
- Forum: General Discussion
- Topic: Reading Certificates from Spiffs partition on the flash memory of esp32
- Replies: 1
- Views: 3161
Re: Reading Certificates from Spiffs partition on the flash memory of esp32
@saransh.goel Have a look at this post. I asked for a similar purpose: https://esp32.com/viewtopic.php?f=13&t=12963 In my case, I ended up copying the certificate data into RAM and passing them to the APIs. It looks like you may have to do the same: https://docs.espressif.com/projects/esp-idf/en/lat...