The polargraph is a fascinating vertical plotter, that uses two small motors and gravity to move a pen over a paper, controlled by software on a computer. Actually ‘polargraph’ is the name given to it by a guy who wrote an

This is an Arduino-based battery powered air quality monitor using the optical SHARP GP2Y1010AU0F dust sensor (or its more recent version the GP2Y1014). It reports values in micrograms per cubic meter, which is also the unit of PM2.5 and PM10. Having

My 8-yo daughter asked if we could put an electronic lock on her treasure box. I suggested we use her Octopus card (Hong Kong public transport smart card) to open and close the box. I had experimented a while ago

Kids love robots. And parents seem to like the idea that their kids are learning about robotics. So i came up with the BuffaloBot for my students: a 2WD Arduino robot with geared motors on a laser cut design of

For my kids workshops i always try to come up with new Arduino games, and they really liked the recent Gyro game.  I decided to make a laser cut box for it, and add a second game, Pong for 2

I have been building several sound boxes lately (amps, sequencers), and when i thought of making an internet radio, i found the excellent Esp-radio project using the Arduino IDE to program the ESP8266 WiFi module (ESP-12E version). The documentation is

I made an Arduino game around the MPU-6050 sensor (6DOF = gyro+accelerometer) and an OLED display: tilt the sensor to move the ball around do not touch the borders try to catch as many squares as possible within 1 minute I’m

One of the more popular projects i build with kids is my Arduino Morse radio, so i started to wonder whether the nRF24L01 can also transmit sound. That’s how i found the excellent RF24Audio library. This library includes all basic

This Arduino-based 4 step sequencer uses the popular Auduino code as synthesiser, with some simple additions to add a sequencer to the code (see below). When i was experimenting with the Atari Punk Console 8-step sequencer described here, i was

In a previous project, i had connected an RGB LED to an ESP8266-01 to be able to change the colour over WiFi. This time i am going to use an 8-pixel Neopixel RGB strip, which only requires 1 digital pin