# Circuit Diagrams

> All About Electronics

---


## Pages

- [Shipment Tracking](https://circuitdiagrams.in/shipment-tracking/)
- [Readymade DIY Electronics Projects For School & College](https://circuitdiagrams.in/readymade-diy-electronics-projects/)
- [Let's Keep In Touch](https://circuitdiagrams.in/lets-keep-in-touch/)
- [Manage Profile](https://circuitdiagrams.in/manage-profile/)
- [Refund and Returns Policy](https://circuitdiagrams.in/refund_returns/)
- [Digital Source Code](https://circuitdiagrams.in/source-code/)
- [Cart](https://circuitdiagrams.in/cart/)
- [Checkout Details](https://circuitdiagrams.in/checkout/)
- [My account](https://circuitdiagrams.in/my-account/)
- [Capacitance Conversion Calculator – pF, nF, µF Converter](https://circuitdiagrams.in/capacitance-conversion-calculator/)
- [Capacitor Code Calculator](https://circuitdiagrams.in/capacitor-code-calculator/)
- [Resistor Color Code Calculator for 4 Band, 5 Band & 6 Band Resistors](https://circuitdiagrams.in/resistor-color-code-calculator/)
- [Advertise With Us](https://circuitdiagrams.in/advertise-with-us/)
- [Homepage - Circuit Diagrams](https://circuitdiagrams.in/)
- [Blog](https://circuitdiagrams.in/blog/)
- [Sitemap](https://circuitdiagrams.in/sitemap/)
- [100+ Top Arduino Projects With Source Code And Circuit Diagrams](https://circuitdiagrams.in/arduino-projects/)
- [100+ Best Electronics Mini Projects for School College Students](https://circuitdiagrams.in/mini-project/)
- [Terms and Conditions](https://circuitdiagrams.in/terms/)
- [Disclaimer](https://circuitdiagrams.in/disclaimer/)
- [Privacy Policy](https://circuitdiagrams.in/privacy-policy/)
- [About Us](https://circuitdiagrams.in/about/)
- [Contact Us](https://circuitdiagrams.in/contact/)

---


## Posts

- [Smart RFID-Based Door Lock System Using ESP32](https://circuitdiagrams.in/esp32-rfid-based-door-lock-system-web-dashboard/)
- [ESP32 Smart Energy Meter with Blynk 2.0](https://circuitdiagrams.in/esp32-smart-energy-meter-with-blynk-iot/)
- [IoT Smart Energy Meter Using PZEM-004T with Protection](https://circuitdiagrams.in/iot-smart-energy-meter-esp8266-pzem004t/)
- [How to Build a Compact Arduino Mini MP3 Player](https://circuitdiagrams.in/arduino-mini-mp3-player/)
- [Build a DIY Angle Meter with Arduino & MPU6050](https://circuitdiagrams.in/angle-meter-arduino-mpu6050-project-tutorial/)
- [Build An Obstacle Avoiding Robot Using Arduino & L298N Motor Driver](https://circuitdiagrams.in/obstacle-avoiding-robot-project/)
- [AC Energy Meter using PZEM-004T & ESP32](https://circuitdiagrams.in/iot-ac-energy-meter-with-pzem-004t-esp32/)
- [How to Make Temperature Controlled PWM Fan Controller Using Arduino & DHT11 Sensor](https://circuitdiagrams.in/temperature-controlled-pwm-fan-controller/)
- [Bluetooth Home Automation System Using ESP32](https://circuitdiagrams.in/bluetooth-home-automation-esp32/)
- [How to Build Your Own Arduino Component Tester](https://circuitdiagrams.in/arduino-component-tester/)
- [Arduino Power Meter Using SCT-013 and ZMPT101B](https://circuitdiagrams.in/arduino-power-meter-with-voltage-protection/)
- [Smart IoT Battery Management System Using ESP32](https://circuitdiagrams.in/iot-battery-management-system-esp32/)
- [Smart Arduino Door Lock System With Voice Alert](https://circuitdiagrams.in/smart-arduino-door-lock-system/)
- [Soil Moisture Detection System Using Arduino](https://circuitdiagrams.in/soil-moisture-detection-system/)
- [Overvoltage And Undervoltage Protection System Using Arduino](https://circuitdiagrams.in/overvoltage-and-undervoltage-protection-system/)
- [IoT Smart Energy Meter Using ESP32 and Blynk 2.0](https://circuitdiagrams.in/iot-smart-energy-meter-using-esp32/)
- [WS2812b Music Rhythm Light Bar Using Arduino](https://circuitdiagrams.in/music-rhythm-light-bar/)
- [Real-Time Heat Index Meter Using Arduino](https://circuitdiagrams.in/real-time-heat-index-meter-using-arduino/)
- [Angle Measurement Device Using Arduino Nano & ADXL335](https://circuitdiagrams.in/angle-measurement-device-using-arduino/)
- [How to Make a DIY Arduino Line Follower Car at Home](https://circuitdiagrams.in/arduino-line-following-robot/)
- [Verilog vs. SystemVerilog: What are the Differences Between Them?](https://circuitdiagrams.in/verilog-vs-systemverilog/)
- [High-Level Synthesis Design Tools vs Conventional FPGA Design Tools](https://circuitdiagrams.in/synthesis-design-tools-vs-conventional-fpga-design-tools/)
- [How to Use And Program CPLD?](https://circuitdiagrams.in/use-and-program-cpld/)
- [How to Build an Automatic Railway Gate Control Using Arduino](https://circuitdiagrams.in/automatic-railway-gate-control-system/)
- [How to Use an Ultrasonic Sensor With Raspberry Pi Pico Board](https://circuitdiagrams.in/use-an-ultrasonic-sensor-with-raspberry-pi-pico/)
- [Audio Spectrum Visualizer Using Arduino & Matrix Display](https://circuitdiagrams.in/audio-spectrum-visualizer-using-arduino/)
- [Obstacle Avoidance Robot Using Raspberry Pi Pico](https://circuitdiagrams.in/obstacle-avoidance-robot-using-raspberry-pi/)
- [IoT Plant Watering System Using ESP8266 & Blynk](https://circuitdiagrams.in/iot-plant-watering-system-using-esp8266/)
- [IoT based Smart Motion Sensing Camera](https://circuitdiagrams.in/smart-motion-sensing-camera/)
- [Wireless Notice Board Using ESP8266 & Matrix Display](https://circuitdiagrams.in/wireless-notice-board-using-esp8266/)
- [Motion Sensing Photo Capturing Device Using ESP32-CAM](https://circuitdiagrams.in/motion-sensing-photo-capturing-device/)
- [Automatic Raindrop Wiper System Using 555 Timer](https://circuitdiagrams.in/raindrop-wiper-system-using-555-timer/)
- [Interface Different Sensors With Single ESP8266 NodeMCU](https://circuitdiagrams.in/interface-different-sensors-with-single-esp8266-nodemcu/)
- [WiFi CCTV Camera Using ESP32-CAM Development Board](https://circuitdiagrams.in/wifi-cctv-camera-using-esp32-cam/)
- [Digital Watch Using ATtiny85 & OLED Display](https://circuitdiagrams.in/digital-watch-using-attiny85/)
- [Interfacing ACS712 Current Sensor With Arduino – Measure Current With Arduino](https://circuitdiagrams.in/interfacing-acs712-current-sensor-with-arduino/)
- [Stereo MP3 Player System Using Arduino & DFPlayer](https://circuitdiagrams.in/arduino-stereo-mp3-player-system/)
- [Auto Cut-Off 3.7 Volt Lithium-Ion Battery Charger Circuit](https://circuitdiagrams.in/3-7-volt-lithium-ion-battery-charger/)
- [ESP32-CAM Wireless WiFi Security Camera](https://circuitdiagrams.in/esp32-cam-wireless-wifi-security-camera/)
- [Digital RPM Meter Using Arduino & IR Sensor](https://circuitdiagrams.in/digital-rpm-meter/)
- [Smart Electronic Voting Machine Using Arduino](https://circuitdiagrams.in/electronic-voting-machine-using-arduino/)
- [Arduino Based Inductance Meter](https://circuitdiagrams.in/arduino-based-inductance-meter/)
- [Interface HC-SR04 Ultrasonic Sensor With ESP32](https://circuitdiagrams.in/interface-hc-sr04-ultrasonic-sensor-with-esp32/)
- [AC Dimmer Circuit Using TRIAC](https://circuitdiagrams.in/ac-dimmer/)
- [Battery Level Indicator System Using LM3914](https://circuitdiagrams.in/battery-level-indicator-system-using-lm3914/)
- [Arduino Calculator Using 4×4 Keypad](https://circuitdiagrams.in/arduino-calculator-using-4x4-keypad/)
- [1.2V-12V Variable Automatic Battery Charger Using Relay](https://circuitdiagrams.in/automatic-battery-charger/)
- [Sound Sensor Module Using LM393](https://circuitdiagrams.in/sound-sensor-module-using-lm393/)
- [How Relay Works - Different Types of Relays](https://circuitdiagrams.in/how-relay-works-different-types-of-relays/)
- [Design an FM Remote Encoder/Decoder Circuit](https://circuitdiagrams.in/fm-remote-encoder-decoder-circuit/)
- [IoT-Based Battery Status Monitoring System Using ESP8266](https://circuitdiagrams.in/battery-status-monitoring-system-using-esp8266/)
- [PIR Sensor Based Security Alarm System Using Arduino](https://circuitdiagrams.in/pir-sensor-based-security-alarm-system/)
- [WS2812B Neopixel RGB LED Control Via ESP8266 And WLED](https://circuitdiagrams.in/ws2812b-neopixel-rgb-led-strip/)
- [Bluetooth Home Automation System Using Arduino And HC-05](https://circuitdiagrams.in/bluetooth-home-automation-system/)
- [WS2812B Ambient Light For TV Using Arduino](https://circuitdiagrams.in/ws2812b-ambient-light-for-tv/)
- [WS2812B Music Reactive LED Strip Using ESP32 And WLED](https://circuitdiagrams.in/ws2812b-music-reactive-led/)
- [AC Current Measurement System Using Arduino And CT Sensor](https://circuitdiagrams.in/ac-current-measurement-using-arduino/)
- [Wireless Doorbell System Using Arduino & RF Module](https://circuitdiagrams.in/wireless-doorbell-system-using-arduino/)
- [DC to DC Boost Converter Circuit Using 555 Timer](https://circuitdiagrams.in/dc-to-dc-boost-converter/)
- [Super Sensitive Intruder Alarm System Using IR And 555 Timer](https://circuitdiagrams.in/super-sensitive-intruder-alarm-system/)
- [9's Complement Using Dual Multiplexer IC-74153](https://circuitdiagrams.in/9s-complement-using-dual-multiplexer/)
- [Design a BCD Subtractor Circuit Using 9's Complement](https://circuitdiagrams.in/bcd-subtractor-circuit/)
- [Arduino Water Flow Rate And Volume Measurement System](https://circuitdiagrams.in/water-flow-rate-and-volume-measurement-system/)
- [Design and Implementation of 10’s Complement Circuit Using IC-7483](https://circuitdiagrams.in/10s-complement-circuit-using-ic-7483/)
- [Design and Implement 9's Complement Circuit Using IC-7483](https://circuitdiagrams.in/9s-complement-circuit-using-ic-7483/)
- [Design And Implementation of a BCD Adder Circuit Using IC-7483](https://circuitdiagrams.in/bcd-adder-circuit-using-ic7483/)
- [Controlling Appliances with ESP32 and MQTT Protocol](https://circuitdiagrams.in/controlling-appliances-with-esp32-and-mqtt-protocol/)
- [IoT Based Energy Consumption Cost Calculator Using ESP8266](https://circuitdiagrams.in/iot-based-energy-consumption-cost-calculator/)
- [Arduino Temperature Controlled Fan Using DHT11 Sensor](https://circuitdiagrams.in/temperature-controlled-fan/)
- [Water Tank Level Controller Using Arduino](https://circuitdiagrams.in/water-tank-level-controller-using-arduino/)
- [Tasmota Home Automation System Using ESP8266](https://circuitdiagrams.in/tasmota-home-automation-system-using-esp8266/)
- [Arduino Based Door Lock System With Password](https://circuitdiagrams.in/arduino-based-door-lock-system-with-password/)
- [Smart Energy Monitoring System Using ESP32 And SCT-013 Sensor](https://circuitdiagrams.in/smart-energy-monitoring-system/)
- [Arduino Line Follower Robot With Obstacle Detection](https://circuitdiagrams.in/arduino-line-follower-robot/)
- [Human Following Robot Using Arduino And L298N Driver](https://circuitdiagrams.in/human-following-robot-using-arduino/)
- [IR Remote Control Car Using Arduino and TSOP1738 Sensor](https://circuitdiagrams.in/ir-remote-control-car-using-arduino/)
- [How does a Mobile Charger Circuit Actually Work?](https://circuitdiagrams.in/how-does-a-5v-mobile-charger-work/)
- [How to Make An Electronic Component Tester Using Arduino](https://circuitdiagrams.in/how-to-make-an-electronic-component-tester/)
- [Android Bluetooth Controlled Robot Using Arduino](https://circuitdiagrams.in/bluetooth-controlled-robot/)
- [Arduino Weather Monitoring Device Using OLED Display](https://circuitdiagrams.in/arduino-weather-monitoring-device/)
- [Automatic Plant Watering System With Arduino](https://circuitdiagrams.in/automatic-plant-watering-system-with-arduino/)
- [PIR Sensor Based Motion Security System Using Arduino](https://circuitdiagrams.in/pir-sensor-based-motion-security-system/)
- [3-Phase Inverter Circuit Using Arduino](https://circuitdiagrams.in/3-phase-inverter-using-arduino/)
- [Capacitance Meter Range 1pF To 4700uF Using Arduino](https://circuitdiagrams.in/capacitance-meter/)
- [Bidirectional Visitor Counter with Light Control Using Arduino (Step-by-Step Guide)](https://circuitdiagrams.in/bidirectional-visitor-counter-using-arduino/)
- [How to Build Car Speed Detector Using Arduino](https://circuitdiagrams.in/car-speed-detector-using-arduino/)
- [Alexa Home Automation System Using Arduino IoT & ESP8266](https://circuitdiagrams.in/alexa-home-automation-system/)
- [ESP8266 WiFi Smart Plug Using NodeMCU](https://circuitdiagrams.in/esp8266-wifi-smart-plug/)
- [High-Voltage Stun Gun Using 555 Timer](https://circuitdiagrams.in/high-voltage-stun-gun/)
- [Motion Sensitive Automatic Light Using 4017 & IR Sensor](https://circuitdiagrams.in/motion-sensitive-automatic-light/)
- [150 Watt Power Amplifier Circuit](https://circuitdiagrams.in/150-watt-power-amplifier/)
- [4-Channel IR Remote Control System Using ATtiny85](https://circuitdiagrams.in/4-channel-ir-remote-control-system/)
- [Short Range FM Transmitter - 100m, 88MHz To 108 MHz](https://circuitdiagrams.in/short-range-fm-transmitter/)
- [Smoke Detector Alarm Using LM358](https://circuitdiagrams.in/smoke-detector-alarm/)
- [Arduino Wattmeter – Voltage, Current and Power Measurement](https://circuitdiagrams.in/arduino-wattmeter/)
- [PWM Motor Speed Controller Using 555 Timer](https://circuitdiagrams.in/pwm-motor-speed-controller/)
- [Temperature And Humidity Monitoring System Using NodeMCU And Blynk](https://circuitdiagrams.in/temperature-and-humidity-monitoring-system/)
- [Fingerprint-Based Biometric Attendance System Using Arduino](https://circuitdiagrams.in/biometric-attendance-system/)
- [Program ATtiny85 Microcontroller Using USB And Digispark Bootloader](https://circuitdiagrams.in/program-attiny85-microcontroller-using-usb/)
- [How To Build 12V DC To 220V AC 35W Inverter Circuit](https://circuitdiagrams.in/12v-dc-220v-ac-inverter-circuit/)
- [Voltage Doubler Circuit Using 555 Timer IC](https://circuitdiagrams.in/voltage-doubler-circuit-using-555-timer/)

---


## Products

- [ESP32 8-Channel Hybrid Smart Home Firmware (Bluetooth + Manual Control)](https://circuitdiagrams.in/shop/esp32-8-channel-smart-home-firmware/)
- [Advanced Smart Energy Meter Source Code with Web Dashboard & CSV Logging](https://circuitdiagrams.in/shop/advanced-smart-energy-meter-source-code/)
- [Arduino AC Power Meter with LCD Display & Automatic Voltage Protection](https://circuitdiagrams.in/shop/arduino-ac-power-meter-voltage-protection/)
- [Arduino Obstacle Avoiding Robot Code with NeoPixel & Servo Scanning](https://circuitdiagrams.in/shop/arduino-obstacle-avoiding-robot-code/)
- [Premium IoT Smart Energy Meter Source Code (PZEM-004T, Blynk)](https://circuitdiagrams.in/shop/energy-meter-pzem-004t-blynk-notification/)
- [Premium IoT Smart Energy Meter Source Code (ESP32, PZEM-004T, Blynk, Telegram)](https://circuitdiagrams.in/shop/iot-smart-energy-meter-esp32-pzem-code/)
- [ESP32 RFID Door Lock System Readymade Project](https://circuitdiagrams.in/shop/smart-rfid-door-lock-system-product/)
- [Smart Energy Meter With Voltage Protection Source Code](https://circuitdiagrams.in/shop/smart-iot-energy-meter-esp32-pzem004t-voltage-protection/)
- [Smart Energy Meter Using ESP32 & Blynk (Blynk Notification)](https://circuitdiagrams.in/shop/esp32-smart-energy-meter-auto-calibration/)
- [Smart WiFi AC Energy Meter (ESP32 + PZEM004T) Source Code](https://circuitdiagrams.in/shop/esp32-wifi-energy-meter-pzem004t/)
- [IoT RFID Door Lock Access Control System Source Code](https://circuitdiagrams.in/shop/esp32-iot-rfid-door-lock-access-control-system/)
- [Arduino Component Tester – Source Code](https://circuitdiagrams.in/shop/arduino-component-tester-source-code/)
- [Smart Energy Meter Using ESP32 & Blynk (Telegram Notification)](https://circuitdiagrams.in/shop/iot-smart-energy-meter-esp32-blynk/)
- [IoT Energy Meter With Protections Using PZEM-004T Source Code](https://circuitdiagrams.in/shop/smart-iot-energy-meter-esp8266-pzem004t/)

---