This device plays programmed songs by delivering and controlling airflow through two standard “C” harmonicas. Two harmonicas are used to produce draw and blow notes while only using compressed air, no vacuum. This is achieved by flipping the reeds in one of the harmonicas. The Electronic Smart Harp or E-Sharp can play a myriad of simple harmonica tunes to entertain guests. A hobbyist could be further entertained by creating an actuated diffuser to play more than one note at a time, or by developing a diaphragm to adjust the air volume per note.
When the device is switched on, start up tune plays, and the LCD will display the name of the project, as well as the developer’s names, followed by a prompt to select a song. Movement of the joystick will toggle between the available songs, and depressing the joystick will select that particular song. A master PIC receives this user input, and communicates with the LCD PIC to find the song. The master PIC will also send a signal to the position and airflow controlling PIC (slave PIC) to play the selected song. This PIC also controls two electronic solenoids, which when activated, open the valve and supply enough air to vibrate the harmonica’s reeds. These valves are connected to tubes that lead to each harmonica. The slave PIC can either send a “blow” command (forward air movement through a standard harmonica) or a “draw” command (forward airflow through a harmonica with reversed reeds.) The air is supplied via a compressor that is externally attached to the device. It was found that the tank should be around 25 psi to provide optimal airflow.
Stop breadboarding and soldering – start making immediately! Adafruit’s Circuit Playground is jam-packed with LEDs, sensors, buttons, alligator clip pads and more. Build projects with Circuit Playground in a few minutes with the drag-and-drop MakeCode programming site, learn computer science using the CS Discoveries class on code.org, jump into CircuitPython to learn Python and hardware together, TinyGO, or even use the Arduino IDE. Circuit Playground Express is the newest and best Circuit Playground board, with support for CircuitPython, MakeCode, and Arduino. It has a powerful processor, 10 NeoPixels, mini speaker, InfraRed receive and transmit, two buttons, a switch, 14 alligator clip pads, and lots of sensors: capacitive touch, IR proximity, temperature, light, motion and sound. A whole wide world of electronics and coding is waiting for you, and it fits in the palm of your hand.
Have an amazing project to share? The Electronics Show and Tell is every Wednesday at 7pm ET! To join, head over to YouTube and check out the show’s live chat – we’ll post the link there.
Join us every Wednesday night at 8pm ET for Ask an Engineer!
Maker Business — Global shipping still hasn’t righted itself
Wearables — Tear it all apart
Electronics — Disable unused channels!
Python for Microcontrollers — Python on Microcontrollers Newsletter: MicroPython 1.16 is out and more! #Python #Adafruit #CircuitPython @micropython @ThePSF
Adafruit IoT Monthly — Toddler Clock, Predictive Weather Station, and more!
Microsoft MakeCode — Arcade Beginner Skillmap
EYE on NPI — Maxim’s Himalaya uSLIC Step-Down Power Module #EyeOnNPI @maximintegrated @digikey
New Products – Adafruit Industries – Makers, hackers, artists, designers and engineers! — JP’s Product Pick of the Week — 4pm Eastern TODAY! 6/22/21 @adafruit @johnedgarpark #adafruit #newproductpick
Sorry, the comment form is closed at this time.