Search found 15 matches

by jimhelios
Sun Apr 05, 2020 3:53 pm
Forum: General Discussion
Topic: New board design with ESP32-WROOM-32U has I2C problem
Replies: 3
Views: 124

Re: New board design with ESP32-WROOM-32U has I2C problem

Thanks @MikeMoy, this problem is resolved. I has SCA and SDL backwards in the test app. Killed lots of time but that's what happens sometimes. Thanks for your suggestion, I'll keep that in mind for next time.
by jimhelios
Sun Apr 05, 2020 7:34 am
Forum: General Discussion
Topic: New board design with ESP32-WROOM-32U has I2C problem
Replies: 3
Views: 124

Re: New board design with ESP32-WROOM-32U has I2C problem

Great idea thanks, I'll do that and report back!
by jimhelios
Sun Apr 05, 2020 7:08 am
Forum: General Discussion
Topic: New board design with ESP32-WROOM-32U has I2C problem
Replies: 3
Views: 124

New board design with ESP32-WROOM-32U has I2C problem

I designed a board and got my first prototype from an assembler. The board has an ESP32-WROOM-32U connected via I2C (module pins 26 (IO4) and 29 (IO5)) to an MCP23017 GPIO expander module. This is the only I2C device on this bus, which has 1K pullup resistors to VCC (3.3V). All three address pins on...
by jimhelios
Thu Feb 20, 2020 12:07 am
Forum: General Discussion
Topic: 32U vs 32UE
Replies: 2
Views: 485

Re: 32U vs 32UE

Thanks! I also emailed expressif support and they said: The two modules are pin-to-pin compatible. The main difference is that ESP32-WROOM-32UE integrates ESP32 ECO V3 chip, and has enhanced security boot and flash encryption. You can find more details about ESP32 ECO V3 here in our news letter: htt...
by jimhelios
Tue Feb 18, 2020 4:31 am
Forum: General Discussion
Topic: 32U vs 32UE
Replies: 2
Views: 485

32U vs 32UE

What's the difference between the ESP32-WROOM-32U and the ESP32-WROOM-32UE ???
by jimhelios
Fri Feb 14, 2020 12:02 am
Forum: General Discussion
Topic: What would I need to enable flashing to a ESP32-WROOM-32
Replies: 10
Views: 3143

Re: What would I need to enable flashing to a ESP32-WROOM-32

Sorry to bump an old thread, but I don't understand the circuit posted by username. It seems if RTS is brought low, then EN will be pulled low through the transistor, but GPIO will remain pulled high because that transistor is now off. If DTR is brought low then GPIO_0 is pulled low as long as RTS i...
by jimhelios
Tue Feb 11, 2020 8:27 pm
Forum: General Discussion
Topic: what is the purpose of the factory AP ("ESP_6C8A79")
Replies: 5
Views: 1067

Re: what is the purpose of the factory AP ("ESP_6C8A79")

The AP mode is very useful. My app comes up and users connect to it via wifi using a websocket, and received streamed data.
by jimhelios
Mon Feb 10, 2020 7:17 am
Forum: ESP32 IDF
Topic: WIFI/BLE Simultaneously
Replies: 52
Views: 34785

Re: WIFI/BLE Simultaneously

Along the same lines, I'm planning an ESP32 project that will stream data through wifi to a web client using web sockets, but also I want to monitor BLE to detect that a remote button has been pressed. If I understand the problem correctly, the issue is that the ESP32 uses the same radio and antenna...
by jimhelios
Mon Feb 10, 2020 5:50 am
Forum: General Discussion
Topic: ESP32 startup time and external watchdog
Replies: 0
Views: 360

ESP32 startup time and external watchdog

Hi, I'm working on a circuit that will use an ESP32-WROOM-32U and I'm thinking that an external watchdog is a good idea. However, I'm aware that the ESP32 starts very slowly, so I was looking at the TSP3823 which has a startup delay of 1.6 seconds after VDD exceeds 1.1V. Is this sufficient? Is there...
by jimhelios
Tue Dec 10, 2019 6:17 am
Forum: General Discussion
Topic: Still can't boot ESP32 Wroom
Replies: 3
Views: 388

Re: Still can't boot ESP32 Wroom

mikemoy wrote:
Sun Dec 08, 2019 5:43 am
What I would do, its take your scope or meter and make sure that GPIO0 is bulled up to 3.3v when you plug it in. If its low at power up it will be in flash mode.
I applied power and I did find 3.3V at pin 25 (IO0) and also, I checked pin 12 and it seems to be pulled low.

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