controller board for 12-24v led lights, board holds arduino and panel of transistors

This is a speech output model for a NIFPES (Nitrogen Injection Fire Prevention and Exhaustion System) machine. ESP32 is being used where it is connected with a limit switch LXW20-11M and ESP32 is connected with DFPlayer mini MP3 Speaker module and the speaker module is further connected to a speaker. This model is powered by a PLC SMPS of 24V and is connected to the door of the control panel of the machine. Function:- Now whenever the door is opened or closed, there is a speech output from the speaker "The door is open" or "The door is closed". Further work to be done:- I need to integrate the fire alarm signals and 20 more signals of 24v each from the PLC output to the ESP32 so that there can be speech outputs whenever any signal is high.

Marine Engine Start Panel Control Board with ESP32-WROOM-32D, 12 V Relay Outputs, PCA9685 LED Drivers, and MOSFET-Based Screen PWM Control

This is an NFC card that works from the solar. On the board, there are two solar panels that accumulate energy through the controller in the supercapacitor. The NFC controller itself can be programmed via the microcontroller on the board #solar #nfc #stm32 #iot

Dual-Board 433 MHz Rolling-Code ATX Power Controller with Integrated 24-Hour Camera Timer and Debounced 2-Pin PANEL_SW Manual Override on U5 Latch Input (Preserves Camera Dial Microswitch Gating)