https://robodium.com/blogs/build-logs/pca9685-drive-12-servos 2026-08-01T22:53:06+05:30 weekly https://cdn.shopify.com/s/files/1/0966/3620/7475/articles/image_1785330313873_26e1c91a_1785330313985_abc66e2f.png?v=1785330387 Driving 12 servos from one board: PCA9685 wiring, power and pulse ranges PCA9685 16-channel PWM servo driver board surrounded by a dozen blue micro servos with their cables plugged into its headers https://robodium.com/blogs/build-logs/line-following-robot-arduino-proportional-control 2026-08-01T22:53:06+05:30 weekly https://cdn.shopify.com/s/files/1/0966/3620/7475/articles/image_1785329575386_727be7cf_1785329575465_b7032598.png?v=1785330038 Line-following robot that actually follows the line: sensor spacing, proportional control and why yours weaves Two-wheeled line-following robot with an Arduino Uno, L298N motor driver and yellow gearbox motors, on a dark workbench with a white line track https://robodium.com/blogs/build-logs/obstacle-avoiding-robot-scanning-ultrasonic 2026-08-01T00:39:36+05:30 weekly https://cdn.shopify.com/s/files/1/0966/3620/7475/articles/image_1785329577045_180e984f_1785329577319_132cb058.png?v=1785330090 Obstacle-avoiding robot with a scanning ultrasonic head Obstacle-avoiding robot with an HC-SR04 ultrasonic sensor mounted on a micro servo scanning head, beside an Arduino Uno and L298N driver https://robodium.com/blogs/build-logs/rfid-solenoid-door-lock-arduino 2026-08-01T22:53:06+05:30 weekly https://cdn.shopify.com/s/files/1/0966/3620/7475/articles/image_1785329586863_0ee99241_1785329587042_b9303ee2.png?v=1785330142 RFID door lock with a solenoid: relays, flyback diodes and not frying your Arduino RC522 RFID reader with a card and keyfob, an Arduino Uno, a relay module and a 12V solenoid door lock on a dark workbench https://robodium.com/blogs/build-logs/nodemcu-room-monitor-local-dashboard 2026-08-01T22:53:06+05:30 weekly https://cdn.shopify.com/s/files/1/0966/3620/7475/articles/image_1785329598557_491bdc94_1785329598624_5bf48898.png?v=1785330196 A room monitor that serves its own dashboard: NodeMCU, DHT11 and no cloud account NodeMCU ESP8266 on a breadboard with a DHT11 temperature sensor and a small blue OLED display on a dark workbench https://robodium.com/blogs/build-logs/robotic-arm-pca9685-six-servo 2026-08-01T22:53:06+05:30 weekly https://cdn.shopify.com/s/files/1/0966/3620/7475/articles/image_1785329615443_70ed7c93_1785329615754_12ce579b.png?v=1785330251 Six-servo robotic arm on a PCA9685: power budget, pulse limits and smooth motion Desktop robotic arm with blue micro servos at its joints, a PCA9685 servo driver with ribbon cable, an Arduino Uno and a bench power supply https://robodium.com/blogs/build-logs/esp32-cam-motion-alert-camera 2026-08-01T22:53:06+05:30 weekly https://cdn.shopify.com/s/files/1/0966/3620/7475/articles/image_1785332618033_e6ebd893_1785332618393_ade09fa6.png?v=1785332753 ESP32-CAM security camera that messages your phone when something moves ESP32-CAM module with a PIR motion sensor, USB-serial programmer and jumper wires on a dark workbench, with a phone showing a notification https://robodium.com/blogs/build-logs/gesture-controlled-robot-mpu6050-nrf24l01 2026-08-01T00:39:36+05:30 weekly https://cdn.shopify.com/s/files/1/0966/3620/7475/articles/image_1785332638398_3978624e_1785332638515_d4a7bf85.png?v=1785332914 Gesture-controlled robot: tilt your hand, the car moves A glove with an MPU6050 gyroscope and Arduino Nano mounted on it, an nRF24L01 radio module, and a small two-wheeled robot on a dark workbench https://robodium.com/blogs/build-logs/sound-reactive-ws2812-led-matrix 2026-08-01T00:39:35+05:30 weekly https://cdn.shopify.com/s/files/1/0966/3620/7475/articles/image_1785332644748_79057fd8_1785332645221_23eb5930.png?v=1785332978 Sound-reactive LED matrix: making a WS2812 panel dance to music A glowing WS2812 RGB LED matrix panel with a sound sensor module and an Arduino Nano on a dark workbench https://robodium.com/blogs/build-logs/self-watering-planter-nodemcu 2026-08-01T00:39:35+05:30 weekly https://cdn.shopify.com/s/files/1/0966/3620/7475/articles/image_1785332641794_25d4fe27_1785332642031_a1457ac8.png?v=1785333043 Self-watering planter that texts you when the tank runs dry A potted plant with a capacitive soil moisture probe, a small submersible pump with tubing, a relay module and a NodeMCU on a breadboard https://robodium.com/blogs/build-logs/colour-sorting-machine-tcs3200 2026-08-01T00:39:35+05:30 weekly https://cdn.shopify.com/s/files/1/0966/3620/7475/articles/image_1785395003114_6a612d94_1785395003530_3a66c733.png?v=1785395110 Colour-sorting machine: making a TCS3200 tell red from orange A TCS3200 colour sensor above coloured beads, with a micro servo chute, an Arduino Uno and jumper wires on a dark workbench https://robodium.com/blogs/build-logs/lpg-gas-leak-alarm-mq6 2026-08-01T00:39:35+05:30 weekly https://cdn.shopify.com/s/files/1/0966/3620/7475/articles/image_1785394990280_d9feb50c_1785394990423_303d6eb2.png?v=1785395295 LPG gas leak alarm that you can actually trust An MQ-series gas sensor module with a 16x2 LCD, buzzer, relay module and Arduino Uno on a dark workbench https://robodium.com/blogs/build-logs/digital-weighing-scale-hx711-load-cell 2026-08-01T22:53:06+05:30 weekly https://cdn.shopify.com/s/files/1/0966/3620/7475/articles/image_1785394990617_0218445c_1785394990905_33f1cf97.png?v=1785397233 Digital weighing scale: HX711, load cells and the two-point calibration A bar load cell with calibration weights, an HX711 amplifier board, a 16x2 LCD and an Arduino Uno on a dark workbench https://robodium.com/blogs/build-logs/heart-rate-monitor-pulse-sensor 2026-08-01T00:39:35+05:30 weekly https://cdn.shopify.com/s/files/1/0966/3620/7475/articles/image_1785395021246_95aaed41_1785395021461_346631e4.png?v=1785398222 Heart rate monitor: counting beats in a very noisy signal A round pulse sensor with a finger strap beside a 16x2 LCD and an Arduino Uno on a dark workbench