Search found 448 matches

by mikemoy
Sat Jun 09, 2018 2:09 pm
Forum: General Discussion
Topic: ESP32 Pocket Programmer ?
Replies: 2
Views: 865

ESP32 Pocket Programmer ?

Just trying to get a vibe on if creating a ESP32 Pocket Programmer would be a good venture or not. We have used these for many years on the production floor, and for infield updates for Atmel products. http://npe-inc.com/pocket-programmer/ Basically you upload your firmware to the programmer, connec...
by mikemoy
Sat Jun 09, 2018 1:37 pm
Forum: General Discussion
Topic: Flashing ESP-Wroom-32 in production
Replies: 12
Views: 5974

Re: Flashing ESP-Wroom-32 in production

but I have now read several places that this is not supported/recommended with ESP32.
Where did you see that ?

How about the ESP32 Programming Tool ?
by mikemoy
Sun Jun 03, 2018 6:06 am
Forum: General Discussion
Topic: Unable to connect to EPS32
Replies: 5
Views: 1518

Re: Unable to connect to EPS32

If what Kolban says does not work, and your sure you have the right com port. Try sticking a 0.1uf -0.22uf from pin 3 (EN) to gnd.
by mikemoy
Sat Jun 02, 2018 11:05 pm
Forum: General Discussion
Topic: Red light is always on
Replies: 8
Views: 7275

Re: Red light is always on

Try sticking a 0.1uf -0.22uf from pin 3 (EN) to gnd.
by mikemoy
Fri Jun 01, 2018 11:59 pm
Forum: General Discussion
Topic: use of LED control for buzzer?
Replies: 12
Views: 3868

Re: use of LED control for buzzer?

That was measured with a scope with 4kHz signal. There's no negative voltage if I drop the GPIO drive strength to minimum. I would not expect a piezo transducer to work well if it's just in series with the drain of a transistor but that should be OK for the electro-magnetic transducer. Cool, at lea...
by mikemoy
Fri Jun 01, 2018 10:04 pm
Forum: General Discussion
Topic: use of LED control for buzzer?
Replies: 12
Views: 3868

Re: use of LED control for buzzer?

Just an FYI, it's not a good idea to drive a piezo electric device via a GPIO pin. Piezo devices can generate negative voltages. I'm getting only -40mV. Is that measured with a scope or meter. You will get much higher voltages than this when you turn a piezo off at the right time. Similar to say wh...
by mikemoy
Fri Jun 01, 2018 9:22 pm
Forum: General Discussion
Topic: use of LED control for buzzer?
Replies: 12
Views: 3868

Re: use of LED control for buzzer?

It would help if you provide a link to the type of buzzer you are using. It sounds to me as if it's probably a piezo transducer such as this. If so, drive it directly from a GPIO, not through a transistor. Just an FYI, it's not a good idea to drive a piezo electric device via a GPIO pin. Piezo devi...
by mikemoy
Fri Jun 01, 2018 5:47 pm
Forum: General Discussion
Topic: use of LED control for buzzer?
Replies: 12
Views: 3868

Re: use of LED control for buzzer?

ok, cool. what about "Did you look at the pin via a scope to ensure your getting the square wave output ?"
by mikemoy
Fri Jun 01, 2018 5:10 pm
Forum: Showcase
Topic: New ESP32-WROVER Ethernet Board
Replies: 34
Views: 23935

Re: New ESP32-WROVER Ethernet Board

FWIW, prototypes have been send out. Will receive them next week.
by mikemoy
Fri Jun 01, 2018 5:07 pm
Forum: General Discussion
Topic: use of LED control for buzzer?
Replies: 12
Views: 3868

Re: use of LED control for buzzer?

Need a little more info.
How are you driving the buzzer? GPIO directly, though a transistor, and if transistor did you add the blocking diode.
Did you look at the pin via a scope to ensure your getting the square wave output ?

Go to advanced search