A module that could store 254 voice commands and you can use 7 at the same time and import any of them. Very useful for robotics. Easy to use with Arduino and UART. Module from ELECHOUSE

Homemade and 3D printed nixie tube with LED strip filament. Controlled with Arduino and serial communication. Real glass without vacuum.

Make a homemade automatic feeder for cat food that has a diplay timer and portions control. It is 3D printed and uses a servo motor to fred the dry food.

How to measure temperature with Arduino and a 3950 thermistor of 100K or 10K and a 4.7K pullup resistor. Above 200ºC using thermistor.h library.

Very low cost reflow hot plate for soldering SMD components with solder paste. Is homemade and made with Arduino a SSR relay a thermistor and a 220V AC heater aluminum plate. The case is 3D printed.

Get the data from the i2c Nunchuch joystick and send it usign the Arduino and the HC-05 Bluetooth module. It will send 5 commands.

MPU6050 gyro and PID control with stepper motors. Balancing robot with Arduino and PCB and TMC stepper driver. Homeamde 3D printed body and Bluetooth remote.

A game that uses High Voltage to "zap" players. A player is picked at random and zapped uisng some flyback high voltage transformers of low power. The case is 3D printed, it uses rechargable batteries with a TP4056 charger, it has a speaker and DF player for sounds and addressable LEDs.

Homemade fully portable soldering iron with a battery inside taht could melt solder in under 10 seconds. See the schematic, the code and the PCB and make a digital soldering ironj yourself It is also based on Arduino and you can always improve the code.

Learn all the blocks of the Arduino internal ADC. All the registers and bits and how to make a measurement. Also how to use the internal temperature sensor.

Solder SMD components on the PCB with solder paste and the stencil using this homemade Reflow hot palte made with a chlotes iron and a solid state relay.

Homemade 7 channel Radio controller with STM32 microcontroller and the NRF24 radio module. It has a 3D printed case and NEXTION touchscreen.

Automatic solder paste dispenser with Arduino, a DC motor with gear and OLED display to select the time and amount of paste to push out. The case is 3D printed.