OLED – HVS Technologies https://www.hvstechnologies.in Hub for Versatile Science & Technologies Fri, 20 Feb 2026 07:03:05 +0000 en-US hourly 1 https://wordpress.org/?v=6.9.4 https://www.hvstechnologies.in/wp-content/uploads/2025/07/favicon-32x32-1.png OLED – HVS Technologies https://www.hvstechnologies.in 32 32 HVS-4622. Battery Management System (BMS) and SOC for Electrical Vehicle using ESP32 and OLED https://www.hvstechnologies.in/product/hvs-4622-battery-management-system-bms-and-soc-for-electrical-vehicle-using-esp32-and-oled/ https://www.hvstechnologies.in/product/hvs-4622-battery-management-system-bms-and-soc-for-electrical-vehicle-using-esp32-and-oled/#respond Fri, 20 Feb 2026 07:03:05 +0000 https://www.hvstechnologies.in/?post_type=product&p=11661 The use of green energy is becoming increasingly important in today’s world. Therefore, electric vehicles are currently the best choice for the environment in terms of public and personal transportation. Because of their high energy density and efficiency, lithium-ion (Li-ion) batteries are widely used in electric vehicles. However, Li-ion batteries can be hazardous if they operate outside their Safe Operating Area (SOA). To ensure safety and optimal performance, a Battery Management System (BMS) is essential for every Li-ion battery, particularly in electric vehicles.

In this work, the purpose, functions, and topologies of BMS are discussed in detail. Additionally, early battery models, along with hardware and system designs for BMS, are reviewed in the literature. An improved battery model is introduced, and simulation results are presented to validate its performance. Finally, a novel BMS hardware system is designed, and experimental results are discussed. Possible improvements for both battery models and BMS hardware are outlined in the conclusions and future work section.

A Battery Management System (BMS) is proposed for electric vehicles, designed to manage Li-ion battery packs by ensuring safe operation and monitoring their status using an ESP32 microcontroller.

The ESP32 serves as the central controller of the system. Integrated modules include a temperature sensor, Li-ion battery pack with relay, charger, and an OLED display. When any of the Li-ion battery packs are drained, the system automatically activates the charger via the relay, and the voltage levels of each battery pack are displayed on the OLED. The system continuously monitors the temperature, and if it exceeds a predefined threshold, the ESP32 activates a buzzer to issue an alert.

The ESP32 measures voltage from the sensors and, based on the readings, switches the relay to control the charging process. The relay functions as a switch to enable or disable the charging connection as needed, ensuring the safe and efficient operation of the Li-ion battery packs.

The major building blocks of this project are:

  • Regulated power supply
  • ESP-32.
  • Temperature sensor.
  • Voltage sensor.
  • Buzzer.
  • Battery pack
  • Relay.
  • Charging Circuit.
  • OLED.
  • LED Indicators
  • Crystal oscillator
  • Reset button.

 

Software’s used:

  • Arduino IDE for dumping code into Micro controller.
  • Express SCH for Circuit design.
  • Embedded C programming.

 

 

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]]> https://www.hvstechnologies.in/product/hvs-4622-battery-management-system-bms-and-soc-for-electrical-vehicle-using-esp32-and-oled/feed/ 0 HVS-4513. Smart Kitchen using NodeMCU and Blynk IOT https://www.hvstechnologies.in/product/hvs-4513-smart-kitchen-using-nodemcu-and-blynk-iot/ https://www.hvstechnologies.in/product/hvs-4513-smart-kitchen-using-nodemcu-and-blynk-iot/#respond Wed, 07 Jan 2026 06:31:03 +0000 https://www.hvstechnologies.in/?post_type=product&p=10456 In this project, we will build an IoT based smart kitchen monitoring system using NodeMCU. This system can monitor the temperature, humidity, Gas and motion using sensors will be display on OLED, also sending this data into the blynkapp through WI-FI. User can access this device with his/her credential using mobile/laptop.

 

The kitchen is one of the important places in a house. The safety factor is the main aspect that must be taken into account during the activity in the kitchen. The existence of gas leakage, uncontrolled fire, excessive temperatures & a moist environment must be quickly identified and addressed.  Apart from this, this system can monitor the motion using PIR sensor and indicate as this through LED which is in Blynkapp. If the system detects the gas, it will turn ON the buzzer for alerts.

 

The system makes a use of NodeMCU microcontroller. The project aims in designing a smart kitchen using IOT and NodeMCU module. NodeMCU is an open-source platform based on ESP8266 which can connect objects and let data transfer using the Wi-Fi protocol. In addition, by providing some of the most important features of microcontrollers such as GPIO, PWM, ADC, and etc, it can solve many of the project’s needs alone.

 

The major features of this project are:

  • Using Blynk app for wireless monitoring and alerting.
  • Using NODEMCU to achieve this task.
  • Using IOT technology.
  • DHT11 sensor-based temperature and humidity detection.
  • MQ-135 based Gas detection.
  • PIR based motion detection.
  • Audible alerts using Buzzer.
  • Visible alerts using LCD display.

 

 

The major building blocks of this project are:

  • Adapter Power Supply.
  • NodeMCU
  • Dht11(temperature, Humidity Sensor)
  • MQ-135 Gas sensor.
  • PIR Sensor.
  • OLED
  • Buzzer

 

 

Software’s used:

  1. Arduino IDE Studio Compiler to write the program.
  2. Embedded C language.
  3. BlynkAPP
  4. Express SCH for Circuit design.

 

 

Regulated Power Supply:

 

 

 

Block Diagram:

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