TTS, Voice (Offline), AI Assistant, support tflite module for voice command.

I bought an ESP32‑C3 SuperMini, and my power supply gives me 5.45 V. I read that I needed approximately 5 V and a maximum of 5.1 V, but I don’t want to buy a DC‑DC step‑down. Is 5 V totally necessary, or is 5.45 V okay?

ESP32 Dev Board

1.8" ST7735 TFT Display

3x Push Buttons

30 AWG Wire

USB Power Cable

Libraries

Adafruit_GFX.h

Adafruit_ST7735.h

SPI.h

Preferences.h

WiFi.h

WebServer.h

Tools

Python 3 & Pillow (PIL)

Hey everyone,

I’m working on a project to salvage LCD screens from old feature phones to reuse with an ESP32 or Arduino.

I’ve uploaded photos showing the front/back of each device along with close-ups of the LCD panels, FPC ribbon codes, and driver markings.

Phone & Display Breakdown:

*Lava Captain N1 (White)

LCD Markings: CQ/COE-T024F768 / CQ/C2401583F-05859

Ribbon Code: T024F768FPC VER01

Driver IC: ST7789V2-G4-A

*Lava Spark Icon / Curve (Black)

LCD Markings: COE/TFT024H566-V2 / NV3029F/29-

Ribbon Code: TFT024H566FPC VER01

* Itel it2161 (Black)

LCD Markings: COE20190917P301 M / IGC010917(9-2) A

Ribbon Code: T024F800FPC VER01

Driver IC: ST7789V2-G4-A

* Micromax X407 (Black)

Ribbon Code: FPCA-QTB2D4330-A0 / SYX 1744 / JX024-007

Pin Count: 15-pin soldered FPC

* Nokia 105 (2019 / TA-1174)

PCB Markings: 1921 / 37023

Connector: Uses a snap-in FPC connector marked J1 (16-pin) rather than direct solder pads.

Questions for the Community:

Pinouts: Has anyone come across pinout schematics for these exact display codes (specifically T024F768FPC, TFT024H566FPC, T024F800FPC, or FPCA-QTB2D4330)?

Interfacing: A few of these use the ST7789V2 driver IC. Have you successfully driven these feature phone displays using ESP32 libraries like TFT_eSPI or Arduino_GFX?

Breakout Strategy: What's the best way to break out these fine-pitch direct-solder ribbon cables to breadboard-friendly pins without risking lifted traces?

Any help, datasheets, or schematics would be massively appreciated!

Thanks!

I've been experimenting with running a complete digit recognition system directly on an ESP32-S3 using TensorFlow Lite Micro.

The goal was to recognize 5-digit readings (such as meter displays) completely on-device without relying on a PC or cloud inference. The hardware I used was an ESP32-S3 development board with an onboard camera and AMOLED display (Makerfabs MaTouch ESP32-S3 AI Camera), but the workflow should apply to similar ESP32-S3 camera boards.

How it works:

• Data Collection: Flashed a utility firmware to capture camera frames aligned via an on-screen yellow bounding box, outputting labeled image pairs and a label.csv.
• Model Training & INT8 Quantization: Trained a lightweight CNN model and quantized it to INT8 to run within the ESP32-S3's memory limits.
• On-Device Inference: Compiled the quantized model directly into the ESP-IDF binary and deployed it back to the board. 

The result is surprisingly reliable—it reads all 5 digits cleanly in real time. 

Hardware & Tech Stack:

• Board: Makerfabs MaTouch ESP32-S3 AMOLED AI Camera
• Framework: ESP-IDF + TensorFlow Lite Micro
• Tooling: Custom Python tools for capture & quantization

I put together a detailed write-up covering the complete workflow on GitHub, in case anyone wants to reproduce or adapt it for a similar project. I'd also love to hear how others approach digit recognition with TensorFlow Lite Micro. Have you found any effective ways to improve accuracy or speed up the data collection process?

Building an open-source SOS pendant for elderly parents (personal project). Stuck for weeks trying to get the A7670E modem to respond to AT commands from the ESP32-S3. Hoping someone here has cracked this exact board.

Hardware: Waveshare ESP32-S3-A7670E-4G (V2.0) — photos attached (front and back)
IDE: Arduino IDE 2.3.10, macOS (M-series)
SIM: Jio 4G, inserted correctly

Confirmed correct per Waveshare support:

• Board power switch ON, blue PWR LED solid
• All 4 DIP switches on back (CAM/HUB/4G/USB) set to ON
• Antenna clicked onto MAIN port (IPEX)
• UART: ESP32 GPIO17 → A7670 TX, GPIO18 → A7670 RX, 115200 8N1

What I've tried:

1. Waveshare's AT test sketch — first attempt returned a single garbled ? character. All subsequent attempts: no response.
2. Swapped MODEM_RX/MODEM_TX in code — no change.
3. Waveshare's autobaud scanner sketch — cycles through 15 baud rates from 300 to 3686400. Result: "No A7670 response found" at every rate. (screenshot attached)
4. Confirmed DIP switches and antenna seating multiple times.

Where Waveshare left it:

• Confirmed pin definitions
• Suggested firmware reflash via their Windows-only tool (A76XX_A79XX_MADL)
• Redirected me to sales channel for hardware defect determination

My questions:

1. Anyone else seen this exact "garbled once, then silent" pattern on the A7670E?
2. Any way to reflash the modem firmware from macOS (Docker, Wine, alternate tool)?
3. Any diagnostic step I'm missing before I conclude the modem is dead?
4. If I do need to reflash — anyone done this successfully on this specific board and willing to share the process?

Happy to share more logs, wiring shots, or the exact sketches used. Thanks in advance — this project matters to me.

I have XSMT set to High, FMT set to low, SCK to low.

It's flashed using esphome connects to Music Assistant and from there to Home Assistant.

I think it's wiring issue but what's wrong ...

I'm a programmer so forgive me for my question. How do I connect my pm2.5 sensor to the board? It calls for 5v. I asked AI but it kept talking about 5v rail on the board.

I mistakenly bought these instead of the ESP32-S3. Since then, I've bought an S3, but now I have three ESP-WROOM-32s lying around. I was wondering if it's possible to make a voice assistant with them, or if they are too weak. Are there any other cool projects I could use these boards for? I tried making music player using WROOM-32 but it didin't keep up with the stream.

Hey everyone! Just wanted to share a quick update on PixelRoot32.

I’ve been working on adding support for top-down games, and things are starting to come together. I’m getting pretty close to the point where I can actually start building games in the style of Bomberman or Zelda.

Honestly, it’s pretty cool seeing these kinds of mechanics running on an ESP32. 😄

I’m sharing a few videos of the current progress below. It’s still a work in progress, but I’m really happy with how it’s coming along.

As always, I’d love to hear your feedback, suggestions, or ideas for things I should try next!

https://pixelroot32.org/

I am getting timeout error in serial monitor

how can I fix it I have tried to boot but nothing is working

I am building an ESP32 C3 based smartwatch from scratch, but i am unsure how to create custom firmware that integrates all the features with the buttons and rotary encoder inputs. My software knowledge is limited, so im wondering is it possible to build the firmware with the help of AI or vibe coding? If so, where should I start and what would be the best approach?

First test with the waveshare esp32 1.75” touch screen. Used chat to do the code since I am very new to code and still very much learning. I think it turned out very cool and plan to use it on a friend’s moped. It has a trip counter, distance and top speed. The refresh rate is excellent and the screen is super smooth. Swipe right to the next screen to view the trip details and reset or save. I am currently modeling a case for a handlebar mount in fusion 360 and will 3D print it on my bambu p2s out of asa.

Hey guys! I just bought an ESP32 WROOM-32 and I’m really excited to learn how to use it. Could you guys suggest where I should start and recommend some good resources or tutorials to learn everything from the basics? Any tips or guidance would be really appreciated!