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Forum Index : Microcontroller and PC projects : New toy - Lolin V3 Node MCU with ESP8266 BASIC
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| lizby Guru  Joined: 17/05/2016 Location: United StatesPosts: 3150 |
The ESP32-C3SuperMini has 13 available I/O pins, most (all?) of which can do anything the others can do. The other three in the 16-pin module are 5V, 0V, and 3V3. If you need more pins, the ESP32-S2Mini has 2 more rows of 8 pins, a few of which are not I/O pins. The outer rows of the S2Mini are pin-for-pin compatible with the ESP8266 D1Mini, so they can be stacked with D1Mini auxiliary modules like DS18B20, OLED, SD Card, etc. PicoMite, Armmite F4, SensorKits, MMBasic Hardware, Games, etc. on fruitoftheshed |
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Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 6772 |
The TX and RX pins may be fixed. Possibly usable as digital IO, but with TX as output only and RX as input only. I'm only guessing and might be wrong. I've not investigated further. manual.pdf Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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| lizby Guru Joined: 17/05/2016 Location: United StatesPosts: 3150 |
You're right about being wrong. On the ESP32-C3SuperMini, any pair of pins can be serial, and either of the two can be either Rx or Tx. Any pair of pins can be I2C, and either can be SDA or SCK. A program can as it's running switch from one pair of I2C pins to another, so that for I2C modules which have, say, 4 possible address settings, you can put 4 on each I2C pair--I've used that to read from 5 INA226 current monitors. You might be able to control multiple I2C OLEDs--I haven't tried that. One restriction is that there are only 2 serial lines at a time, and it's recommended that for connecting with other devices, serial2 be used so that console messages don't interfere. But if you wanted a call-and-response interaction via serial, instead of using multi-drop you could set up serial2 in sequence with different pins, send your message and get a response (or time out) before moving to the next device in a round-robin cycle. PicoMite, Armmite F4, SensorKits, MMBasic Hardware, Games, etc. on fruitoftheshed |
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| Volhout Guru Joined: 05/03/2018 Location: NetherlandsPosts: 4222 |
Well, it took me something like 45 minutes to go through my pile of parts to find an old ESP-WROOM-32 development board. I knew I had one somewhere. From a failed project 2 years ago. The ONLINE flasher worked perfect, and now I can CRTL-SHFT-F1/F2/F3. This makes the entry a lot easier. The test code I wrote for the 8266 worked identical after I changed the GPIO pins (used D0 before, but this is connected to the 2102 on ESP32). I am still puzzled why people always go for the smallest boards. IF you really want your project to fit in a sugar cube, okay. But until the final iteration of your project, you are better of with a bigger PCB. Volhout Edited 2024-11-05 06:14 by Volhout PicomiteVGA PETSCII ROBOTS |
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| JanVolk Senior Member  Joined: 28/01/2023 Location: NetherlandsPosts: 143 |
Harm, Also take a look on the cicciocb forum for the test code for a sine wave generator for the two DAC outputs on a standard ESP32. Looks great on a scope. Jan. |
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| lizby Guru Joined: 17/05/2016 Location: United StatesPosts: 3150 |
For my wifi (IOT) projects around the house, the 16 pins on the C3SuperMini are about perfect--more, actually, than I have ever needed. Other than on a PCB trying to exercise as many as possible of the "36-in-one" sensor modules, I've never come close to using the available pins on the PicoMite. PicoMite, Armmite F4, SensorKits, MMBasic Hardware, Games, etc. on fruitoftheshed |
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| Volhout Guru Joined: 05/03/2018 Location: NetherlandsPosts: 4222 |
Hi Lizby, My main development platform is a Pico (2040) VGA setup, and I constantly run out of pins. There are only 10 left in the VGA platform (GP0,1,2,3,4,5,22,26,27,28). Volhout Edited 2024-11-05 18:45 by Volhout PicomiteVGA PETSCII ROBOTS |
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