Search found 1815 matches

by WiFive
Wed Jul 18, 2018 8:20 pm
Forum: ESP32 Arduino
Topic: ESP32 GPIO 34/ GPIO35 softwareserial problem.
Replies: 2
Views: 68

Re: ESP32 GPIO 34/ GPIO35 softwareserial problem.

martinayotte wrote:GPIO34 to GPIO39 are "Input Only" ...


He said RX
by WiFive
Wed Jul 18, 2018 7:54 pm
Forum: General Discussion
Topic: ESP32 ISR and Optocoupler Double Interrupt (Spurious?)
Replies: 8
Views: 172

Re: ESP32 ISR and Optocoupler Double Interrupt (Spurious?)

When you have a slow rise time noise is going to be a bigger factor. If you are using an open collector optocoupler and not a logic output optocoupler you need a strong pull-up to have a fast rise time.
by WiFive
Tue Jul 17, 2018 7:26 pm
Forum: General Discussion
Topic: ESP32 ISR and Optocoupler Double Interrupt (Spurious?)
Replies: 8
Views: 172

Re: ESP32 ISR and Optocoupler Double Interrupt (Spurious?)

10% error due to noise sounds more like a hardware design issue than a bug. In your photo your test leads are huge antennas. You could try one of the following workarounds 1. Ignore second interrupt within x time since previous interrupt based on known signal parameters 2. Use low level interrupt, s...
by WiFive
Tue Jul 17, 2018 3:08 am
Forum: Report Bugs
Topic: Always get 0 pins as ext1 wakeup source from deep sleep.
Replies: 4
Views: 109

Re: Always get 0 pins as ext1 wakeup source from deep sleep.

Since they all have to be low to wake up do you mean the last pin to go low? I don't think that would be stored in any registers.
by WiFive
Mon Jul 16, 2018 5:08 pm
Forum: Hardware
Topic: How to change device name connected to WiFi
Replies: 1
Views: 68

Re: How to change device name connected to WiFi

Not a hardware question

tcpip_adapter_set_hostname
by WiFive
Mon Jul 16, 2018 2:53 am
Forum: Report Bugs
Topic: Always get 0 pins as ext1 wakeup source from deep sleep.
Replies: 4
Views: 109

Re: Always get 0 from as ext1 wakeup source from deep sleep.

If the mode is ESP_EXT1_WAKEUP_ALL_LOW then don't you already know that they are ALL LOW?
by WiFive
Sat Jul 14, 2018 3:51 pm
Forum: General Discussion
Topic: ROM, RAM and flash difference and usage
Replies: 4
Views: 111

Re: ROM, RAM and flash difference and usage

ROM stands for Read Only Memory so yes you need flash. D0WD uses external flash.
by WiFive
Fri Jul 13, 2018 7:42 pm
Forum: General Discussion
Topic: ESP32 ISR and Optocoupler Double Interrupt (Spurious?)
Replies: 8
Views: 172

Re: ESP32 ISR and Optocoupler Double Interrupt (Spurious?)

The result is that for a Single activation of the optocoupler the Interrupt routine has 2 interrupts, one for a Low and another for a High when it is clearly defined only NEGEDGE. Could it be that due to noise there is a tiny negative edge in the rising signal right at the voltage threshold? Can yo...

Go to advanced search