Search found 38 matches

by bobtidey
Sun Oct 07, 2018 9:56 pm
Forum: ESP32 Arduino
Topic: Digital pins usable for interrupts
Replies: 2
Views: 2723

Re: Digital pins usable for interrupts

I believe that any GPIO that can be used for normal input can be used as an interrupt source. All GPIO events get handled by a common single low level interrupt handler. In the esp32 Arduino the attachInterrupt controls an entry in a dispatch table that the common handler then uses to call the user ...
by bobtidey
Fri Sep 28, 2018 7:34 am
Forum: ESP32 Arduino
Topic: Can I write to an INPUT GPIO pin?
Replies: 7
Views: 3429

Re: Can I write to an INPUT GPIO pin?

It is perfectly legitimate and quite normal to write data to a GPIO before setting its mode. The value will be held locally in the GPIO data register but will have no effect if the mode is input. Setting the mode to output will then immediately reflect the state of the data on the pin. So it is comm...
by bobtidey
Sat Sep 08, 2018 8:10 pm
Forum: ESP32 Arduino
Topic: Webserver, server.onNotFound(handleNotFound);
Replies: 2
Views: 1516

Re: Webserver, server.onNotFound(handleNotFound);

The handleBotFound routine can access what it needs from the server object

server.uri() will tell you the request, server.arg("argname") can retrieve any arguments included.
by bobtidey
Sat Sep 08, 2018 8:06 pm
Forum: ESP32 Arduino
Topic: WifiManager for ESP32
Replies: 4
Views: 5469

Re: WifiManager for ESP32

Check out

https://github.com/zhouhan0126/WIFIMANAGER-ESP32

This can actually work for 8266 or 32 dependent on a define
by bobtidey
Mon Aug 27, 2018 8:17 pm
Forum: ESP32 Arduino
Topic: Noob question about flashing chip
Replies: 7
Views: 3137

Re: Noob question about flashing chip

mosfet schematic looks good.

The driver allows increased current for more range. 100R will give about 30mA. 47R will give about 60mA. 33R will give about 100mA.
Most IR LEDS allow 100mA continuous. I tend to use 47R but 100R will give good range.
by bobtidey
Sat Aug 25, 2018 8:49 pm
Forum: ESP32 Arduino
Topic: Noob question about flashing chip
Replies: 7
Views: 3137

Re: Noob question about flashing chip

Driving the IR LED directly through a low value resistor from a GPIO pin is not a good idea. I would put a buffer transistor or MOSFET to drive the IR LED. That can also allow a higher current through the LED to improve its range. You can for example connect the LED to the +5V through a resistor (47...
by bobtidey
Fri Jun 22, 2018 8:40 am
Forum: ESP32 Arduino
Topic: esptool reset after upload
Replies: 3
Views: 2172

Re: esptool reset after upload

Thanks. I thought I'd searched for references to --after but somehow missed the one in platforms.txt

I'd seen the comments about not supported in the esptool code but it was a bit ambiguous which is why I had wanted to try it.

I guess I can either live with it (no big deal) or hack a rts connection.
by bobtidey
Thu Jun 21, 2018 9:17 pm
Forum: ESP32 Arduino
Topic: esptool reset after upload
Replies: 3
Views: 2172

esptool reset after upload

I can successfully upload code to my Wroom-32 modules using windows arduino environment. The upload is automatic based on using DTR to activate upload mode and reset the chip. As I don't have RTS available I must then separately reset the module to run the code. The esptool.py version of the tool se...

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