Certainly! Let’s break down the connections step-by-step and clarify how everything is wired between your **ESP32**, the **4 I2C sensors**, the **HX711 sensor**, and the **battery**. --- ## 1. **Understanding the Sensors and ESP32 Pins** ### a. **First Four Sensors** - Each has **4 pins**: - **SDA** (Data line, I2C) - **SCL** (Clock line, I2C) - **Vin** (Power, usually 3.3V or 5V) - **GND** (Ground) ### b. **Fifth Sensor: HX711** - Has **2 pins**: - **DT** (Data, sometimes called DOUT) - **STK** (Clock, sometimes called SCK or CLK) ### c. **ESP32** - Microcontroller with multiple GPIO pins. - Has power pins: **3.3V**, **5V**, and **GND**. - Has I2C pins: can use **any GPIO** for SDA/SCL (most commonly used are GPIO21 (SDA) and GPIO22 (SCL)). - Has digital GPIO pins for HX711. ### d. **Battery** - Connected **only to the ESP32** (to its Vin or 5V/3.3V input), and **not directly to any sensor**. --- ## 2. **Wiring Step-by-Step** ### **Step 1: Battery to ESP32** - **Connect Battery’s (+) terminal** to the **Vin (or 5V/3.3V) pin** of the ESP32. - **Connect Battery’s (-) terminal** to the **GND of the ESP32**. - **No other component is connected to the battery**. --- ### **Step 2: Each of the Four I2C Sensors** For **each sensor (Sensor 1–4)**: #### a. **Vin Pin** - **Connect sensor’s Vin** to the **ESP32’s 3.3V or 5V pin** (depending on sensor requirement). #### b. **GND Pin** - **Connect sensor’s GND** to the **ESP32’s GND pin**. #### c. **SDA Pin** - **Connect sensor’s SDA** to the **ESP32’s SDA pin** (e.g., GPIO21). #### d. **SCL Pin** - **Connect sensor’s SCL** to the **ESP32’s SCL pin** (e.g., GPIO22). **Note:** - All sensors share the same SDA and SCL lines (I2C bus), so you connect all SDA’s together to ESP32 SDA, and all SCL’s together to ESP32 SCL. - But you said each sensor is independently wired with 4 wires, so each sensor has its own 4-wire bundle to the ESP32, but all SDA wires go to the same SDA pin, all SCL wires to the same SCL pin, etc. --- ### **Step 3: HX711 Sensor** - **DT Pin:** Connect to any available ESP32 GPIO (e.g., GPIO 17). - **STK Pin:** Connect to another ESP32 GPIO (e.g., GPIO 16). - **VCC Pin:** Connect to ESP32 3.3V or 5V. - **GND Pin:** Connect to ESP32 GND. --- ## 3. **Summary Table** | Component | To ESP32 Pin | |-------------------|---------------------| | Battery (+) | Vin/5V/3.3V | | Battery (-) | GND | | Sensor 1–4: Vin | 3.3V or 5V | | Sensor 1–4: GND | GND | | Sensor 1–4: SDA | SDA (e.g., GPIO21) | | Sensor 1–4: SCL | SCL (e.g., GPIO22) | | HX711: VCC | 3.3V or 5V | | HX711: GND | GND | | HX711: DT | GPIO (e.g., GPIO17) | | HX711: STK | GPIO (e.g., GPIO16) | --- ## 4. **Final Schematic Summary** - **Battery** → **ESP32 power pins only** - **ESP32** → Powers all sensors via its own supply pins. - **I2C Sensors (1–4)** → Each has **4 wires (SDA, SCL, Vin, GND)** going to ESP32. All SDA’s connect to the same ESP32 SDA pin, all SCL’s to SCL pin, all Vin’s to 3.3V/5V, all GND’s to GND. - **HX711** → Connects DT and STK to any ESP32 GPIOs, and VCC/GND to ESP32 power. --- ## **Final Answer (Step-by-Step Summary):** 1. **Connect the battery terminals only to the ESP32’s power and ground pins.** 2. **For each of the four sensors, connect:** - Vin → ESP32 3.3V or 5V - GND → ESP32 GND - SDA → ESP32 SDA pin (all SDA’s go to same pin) - SCL → ESP32 SCL pin (all SCL’s go to same pin) 3. **Connect the HX711 sensor:** - VCC → ESP32 3.3V or 5V - GND → ESP32 GND - DT → ESP32 GPIO (e.g., GPIO17) - STK → ESP32 GPIO (e.g., GPIO16) 4. **No other component is connected to the battery directly**; all sensors get power via the ESP32. **You have a total of:** - 4 × 4 = **16 wires** for the four I2C sensors - 2 wires (DT, STK) + 2 wires (VCC, GND) = **4 wires** for HX711 - 2 wires for the battery to ESP32 **All wiring is independent per sensor, but all share the same ESP32 pins for power and I2C as appropriate.** --- **If you need a diagram, let me know!**