Ini
[env:esp32dev]
platform = espressif32
board = esp32dev
framework = arduino
monitor_speed = 115200
lib_deps =
  sensirion/arduino-i2c-scd4x
  adafruit/Adafruit SHT31 Library
  adafruit/Adafruit ADXL345
  adafruit/Adafruit Unified Sensor
  electroniccats/MPU6050
  bogde/HX711
  robtillaart/OPT3001

Cpp
#include <Arduino.h>
#include <Wire.h>
#include <SPI.h>
#include <driver/i2s.h>
#include <Adafruit_SHT31.h>
#include <Adafruit_ADXL345_U.h>
#include <HX711.h>

constexpr int SDA_PIN=21,SCL_PIN=22;
constexpr int SPI_SCK=18,SPI_MISO=19,SPI_MOSI=23,ADXL_CS=32;
constexpr int HX_DOUT=35,HX_SCK=33;
constexpr int I2S_BCLK=26,I2S_WS=25,I2S_SD=34;
constexpr int CAM_TX=17,CAM_RX=16,CAM_EN=4;
constexpr int RS_TX=13,RS_RX=14,RS_DE=27;
constexpr int ADC_SOLAR=36,ADC_BAT=39;
// ADC scaling: solar 200k/27k (nominal factor 8.4074), battery 100k/39k (3.5641).
// Convert calibrated ADC pin voltage using these factors; characterize ESP32 ADC per module.
HardwareSerial CamSerial(2); HardwareSerial GateSerial(1);
Adafruit_SHT31 sht31=Adafruit_SHT31();
Adafruit_ADXL345_Unified adxl(12345); HX711 hx;
void muxChannel(uint8_t ch){ Wire.beginTransmission(0x70); Wire.write(1u<<ch); Wire.endTransmission(); }
// GATE_PWR_EN is exposed as a hardware-default-off service/test control because no additional
// non-strapping output GPIO remains in the locked 38-pin allocation. Do not enable gate power
// until the final controller/control expansion decision is made.
void setup(){
  Serial.begin(115200); // UART0 preserved
  pinMode(CAM_EN,OUTPUT); digitalWrite(CAM_EN,LOW);
  pinMode(RS_DE,OUTPUT); digitalWrite(RS_DE,LOW);
  Wire.begin(SDA_PIN,SCL_PIN,100000);
  SPI.begin(SPI_SCK,SPI_MISO,SPI_MOSI,ADXL_CS); adxl.begin(ADXL345_DEFAULT_ADDRESS,&SPI);
  hx.begin(HX_DOUT,HX_SCK);
  CamSerial.begin(115200,SERIAL_8N1,CAM_RX,CAM_TX);
  GateSerial.begin(115200,SERIAL_8N1,RS_RX,RS_TX);
  i2s_config_t c{}; c.mode=(i2s_mode_t)(I2S_MODE_MASTER|I2S_MODE_RX); c.sample_rate=16000; c.bits_per_sample=I2S_BITS_PER_SAMPLE_32BIT; c.channel_format=I2S_CHANNEL_FMT_ONLY_LEFT; c.communication_format=I2S_COMM_FORMAT_STAND_I2S; c.intr_alloc_flags=0; c.dma_buf_count=4; c.dma_buf_len=256; c.use_apll=false; c.tx_desc_auto_clear=false; c.fixed_mclk=0;
  i2s_pin_config_t p{I2S_BCLK,I2S_WS,I2S_PIN_NO_CHANGE,I2S_SD}; i2s_driver_install(I2S_NUM_0,&c,0,nullptr); i2s_set_pin(I2S_NUM_0,&p);
  analogReadResolution(12); muxChannel(0); sht31.begin(0x44);
}
void loop(){
  uint16_t solar=analogRead(ADC_SOLAR), bat=analogRead(ADC_BAT);
  muxChannel(0); float t=sht31.readTemperature();
  Serial.printf("solar=%u bat=%u temp=%.2f\n",solar,bat,t);
  delay(1000);
}