Want to show a battery percentage indicator on your Arduino or ESP32 project ?
With the MX1BM1-Battery Level Monitor Module, you can easily measure battery voltage and convert it into a battery percentage (0–100%).
This tutorial explains how to:
- Read the battery voltage using MX1BM1 Module
- Convert the voltage into percentage
- Display it in Serial Monitor or on an OLED screen
- What You’ll Need
Components:
- MX1BM1 Battery Level Monitor Module
- ESP32 or Arduino board
- 1S LiPo / Li-ion battery (3.0V – 4.2V range)
- Breadboard and jumper wires
- (Optional) OLED display for on-screen battery indicator
Download Gerber Files | Read Full Datasheet
How the Module Works
The MX1BM1 module safely scales your battery voltage (3.0 – 5.2V) down to a level your 3.3V ADC can read.
It uses a 100kΩ + 10kΩ resistor divider, meaning the output voltage is:
Then, your microcontroller reads VCL and reconstructs the actual battery voltage.
Battery Voltage vs Percentage Chart (1S LiPo Battery)
Voltage (V) | Percentage (%) |
4.2 | 100% |
4.1 | 90% |
3.95 | 80% |
3.85 | 70% |
3.8 | 60% |
3.75 | 50% |
3.7 | 40% |
3.6 | 30% |
3.5 | 20% |
3.4 | 10% |
3.2 | 0% |
Note: LiPo cells are not perfectly linear, but this mapping gives a good approximation for battery indicators.
Circuit Setup
Connections (Arduino Example):
- VBAT → Battery +
- GND → Battery – & GND
- EN → D5 (or any GPIO)
- CL → A0 (ADC pin on arduino)
Example Arduino / ESP32 Code
#define EN_PIN 5
#define CL_PIN A0
void setup() {
pinMode(EN_PIN, OUTPUT);
digitalWrite(EN_PIN, LOW);
Serial.begin(9600);}
void loop() {
digitalWrite(EN_PIN, HIGH); // Enable module
delay(5); // Wait for stable output
int raw = analogRead(CL_PIN); // Read ADC value
digitalWrite(EN_PIN, LOW); // Disable module
// Voltage divider: R1 = 100k, R2 = 10k
// Divider ratio: CL = VBAT * (10 / 110) = VBAT * 0.0909
// So, VBAT = CL / 0.0909
float v_adc = raw * (3.3 / 4095.0);// ADC(assuming 12-bit ADC and 3.3Vref)
float battery_voltage = v_adc / 0.0909; // Reconstruct battery voltage
Serial.print(“Battery Voltage: “);
Serial.print(battery_voltage, 2); // 2 decimal places
Serial.println(” V”);
delay(1000);}
Applications
- Battery level monitoring in IoT sensors
- Smart gadgets with on-screen battery percentage
- Power banks or portable tools
- Robots, drones, and RC systems
- Battery-powered ESP32 or Arduino devices
Tips for Accurate Readings
- Use a 10µF capacitor (already on the MX1BM1 module) to stabilize readings.
- Calibrate your ADC reference if accuracy is critical.
- Take multiple readings and average them to reduce noise.
- Disable the divider (EN LOW) when not in use to save battery.
Conclusion
Using this MX1BM1 Battery Level Monitor Module you can easily measure battery voltage and display battery percentage in any Arduino or ESP32 project. It’s compact, accurate, and perfect for IoT, wearables, and battery-powered electronics.
Get your Datasheet in PDF
Battery Level Monitor Module Gerber Files – MX1BM1 | Battery Voltage Indicator PCB Design
Original price was: ₹499.00.₹359.00Current price is: ₹359.00.
A compact 4-pin module for monitoring battery voltage (3–5.2V) using an ADC, with enable function ideal for 1S LiPo and USB-powered projects.
Description
Disclaimer (Digital Product)This product is a digital production pack, not a physical or assembled PCB. You will receive Gerber files, BOM, Schematics and documentation required to manufacture the PCB Module. No physical boards are shipped.Download Product Datasheet: Download Now
Overview
The MX1BM1 Battery Level Monitor Module Gerber Files package provides a compact, low-power battery voltage monitoring PCB design for embedded systems, IoT devices, and battery-powered electronics. This board is designed to safely measure battery voltages ranging from 3.0V to 5.2V, making it suitable for 1S LiPo, Li-ion batteries, and USB-powered systems.
This battery level monitor PCB uses a precision voltage divider circuit combined with a MOSFET-based enable control, allowing developers to measure battery voltage only when required. This approach dramatically reduces standby current and makes the design ideal for deep-sleep applications and low-power battery management systems.
The module outputs a scaled analog voltage that can be directly connected to the ADC pin of popular microcontrollers such as ESP32, ESP8266, ESP32-C6, STM32, Arduino, and Raspberry Pi Pico. The design ensures ADC-safe voltage levels while maintaining measurement accuracy.
If you are searching for battery level indicator PCB Gerber files, battery monitoring circuit design, voltage divider PCB, or battery management design files, this module is a ready-to-manufacture solution.
Key Features
- Supports 3.0V to 5.2V battery input (VBAT)
- Optimized for 1S LiPo, Li-ion, and USB power sources
- Enable-controlled voltage divider for ultra-low power consumption
- Clean, stable ADC output using a 10 µF smoothing capacitor
- Scaled analog output safe for 3.3V ADC microcontrollers
- Standard 2.54mm 4-pin header for breadboard and jumper wire use
- Compact, space-saving PCB layout
- Designed for makers, hobbyists, engineers, and product developers
Applications
The MX1BM1 Battery Level Monitor Module is ideal for:
- Battery-powered IoT devices
- Wireless sensor nodes
- Low-power embedded systems
- Battery level reporting and telemetry
- Wearable electronics
- USB-powered diagnostic tools
- Battery cutoff and protection logic
- Prototyping battery management circuits
- Educational and DIY electronics projects
This PCB design is especially useful for developers building battery management systems, portable electronics, and energy-efficient microcontroller projects.
What You Will Receive (Digital Download)
This product pack will include:
- PCB Gerber Files
- Bill of Materials (BOM)
- Pick and Place (CPL)
- Example Arduino code for battery voltage reading
- Full product datasheet
- Documentation pack (README, License, T&C)
These files can be directly uploaded to PCB manufacturers such as JLCPCB, PCBWay, other manufacturers for fabrication.
Why Choose This Battery Level Monitor Module?
Unlike generic voltage divider circuits, the MX1BM1 design focuses on power efficiency, ADC safety, and real-world usability. The enable-controlled divider ensures minimal battery drain, making it suitable for production-grade designs, not just prototypes.
Whether you are a hobbyist looking for a reliable battery level indicator PCB or an engineer searching for ready-made battery monitoring Gerber files, this module saves design time and reduces risk.
Electrical Specifications
Input Voltage Range (VBAT): 3.0 V – 5.2 VSupported Battery Types:- 1S LiPo
- 1S Li-ion
- USB-powered sources
Pinout Description
| Pin | Label | Function |
| 1 | VBAT | Connect to battery or input voltage (max 5.2V) |
| 2 | GND | Ground connection |
| 3 | EN | Enable control (active HIGH, 3.3V logic) |
| 4 | CL | Scaled analog voltage output to MCU ADC |
PCB Layout & Dimensions
| Parameter | Value |
| Board Size | 12mm x 10mm |
| Layers | 2 |
| Components Placement | Top layer (Single side) |
| Pin Pitch | 2.54mm |
| Pin Header | 1×4 Male |
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