The maker movement has spawned a array of electronics prototyping platforms like the Arduino, the Raspberry Pi (RPi), micro:bit, and the Ambit Playground Express (CPX). What all of these platforms accept in accepted is their amount effectiveness, high-performance, and that they accommodate a low barrier to access to those attractive to get into DIY electronics.
But there is accession development accessory that has entered the educational technology and maker artefact bazaar alleged the evive. In this Apparatus Freak article, the evive we’ll be exploring the evive by architecture a low-frequency theremin.
What is the evive?
The evive is an all-one electronics and robotics prototyping and technology acquirements platform. (Image source: Agilo Research Pvt, Ltd.)
The evive was created by Agilo Research Pvt, Ltd, an educational technology accouterments startup amid in Ahmedabad, Gujarat India. The co-founders Dhrupal Shah, Abhishek Sharma, and Pankaj Kumar Verma, are three agog entrepreneurs and engineers who dreamt of enabling adolescent minds to innovate and actualize by accouterment them with world-class technology and acquirements resources. The evive originated from this eyes and provides a abundance of technology assets aural a distinct prototyping platform.
The evive is a palm-sized prototyping belvedere (115 x 140 x 32mm) acclimated for acquirements electronics and robotics through constructionism-based projects. The evive weighs 340 grams, including the rechargeable 5VDC lithium-ion battery.
The evive appearance are across-the-board to a acceptable electronics and robotics lab and include: an chip oscilloscope; a action architect and voltmeter for electrical altitude abstracts visualization; an Chip H-bridge motor driver; two potentiometers; toggle/momentary pushbutton switches; a thin-film transistor (TFT) display; an adjustable 0- 5VDC ability supply; and digital-analog advocate (DAC).
On top of the evive’s printed ambit lath (PCB) is a mini breadboard, bifold in band changeable attack connectors for alien cyberbanking ambit prototyping and adjustment of alien shields, and alien connectors for XBee and Bluetooth advice modules. The amount development lath that allows these chip appearance to assignment synchronously is an Arduino Mega 2560 (which is based on the ATmega2560 from Microchip Technology). Technology concepts and projects that can be advised with evive include: the Internet of Things (IoT) the Automated Internet of Things (IIoT/Industry 4.0); robotics; predictive maintenance; automation; and cyberbanking controls. With the chip solderless breadboard, General Purpose Input-Output (GPIO), and analog-digital advocate (ADC) changeable attack connectors, a array of alien anchored platforms can be included for architecture proof-of-concept prototypes.
A Low-Frequency evive Theremin
Now that we’ve gotten our introductions out of the way, let’s analyze architecture a low-frequency theremin application the evive.
The theremin is an cyberbanking agreeable apparatus that generates sounds from duke gestures based on their adjacency to the instrument’s two antennas. The theremin’s cyberbanking oscillators absolute the abundance or aural complete based on the thereminist’s hands’ ambit aural the two antennas. A archetypal theremin’s capricious abundance oscillator is in the ambit of 257 – 260 KHz. The achievement abundance ambit of the evive theremin is beneath 20Hz. Therefore, the aural complete varies amid distinct alarm pulses to a solid-state buzzer. The low abundance theremin’s accessory architecture is based on a simple amalgam architecture consisting of the evive, a ablaze sensor, and apostle amplifier.
Device Architecture (Block Diagram)
The low-frequency theremin is a amalgam architecture application off-the-shelf cyberbanking components. The architecture consists of a photocell (light sensor) accepting ambient ablaze levels at pin A12 of the evive -ATmega2560-based microcontroller. The anchored software residing central of the Arduino microcontroller’s RAM anamnesis will apprehend the capricious ablaze akin analog values. These analog ethics will accommodate capricious aflame ante for the LED active to pin D13 of the microcontroller. The LED aflame aural achievement sounds will be heard through the littleBits o26 apostle cyberbanking module.
Here’s the complete amalgam architecture of the theremin:
The low abundance theremin consists of off the shelf cyberbanking components.
Parts List and Accessory Assembly
The table apparent abutting lists the apparatus for the duke gesture-based ascendancy oscillator. Although the table lists specific cyberbanking apparatus for the project, the able maker or architect can use adapted another genitalia to body the device.
Description- Ambit Reference Designator
Electronic prototyping device
littleBits o26 speaker
Electronic apostle amplifier module
Electrical terminal block
Light abased resistor (PC1)
4.7 Kilo-ohm (KΩ) resistor:(yellow, violet, red, gold stripes)
A fixed-pulldown resistor (R1)
220 ohm (Ω) resistor: (red, red, brown, gold stripes)
A fixed-series accepted absorbed resistor (R2)
Light abounding diode (LED) red or another color
Audible achievement beheld indicator (LED1)
Electrical jumper wires
The littleBits proto-module: (Image source: littleBits)
The access abaft this architecture is a concrete mashup of altered educational technology prototyping and acquirements platforms. Rapid prototyping application this this mashup adjustment allows makers and engineers to use low- and high-tech development boards and accoutrement to abduction specific accouterments features.
The architecture abstraction claiming of this activity is the affiliation of the evive and the littleBits articles to rapidly advance a proof-of-concept aural and beheld electronics device. The evive theremin PoC produces low-frequency aural tones based on the concrete adjacency apprehension of a hand. The key basic to abetment in the electrical ambit affiliation of these altered educational technology accoutrement is the use of the littleBits proto module.
Pinout of a archetypal littleBits bitSnap.
The littleBits proto-module abide of two three terminal blocks and jumpers army on a mini PCB. The mini PCB has two artificial bitSnaps that accept metal pins for accouterment electrical access to adjoining littleBits cyberbanking modules. The electrical access include: vcc ( 5V ability supply), sig (electrical signal), and gnd (electrical ground). To abate absurdity in architecture a littleBits apparatus or device, baby magnets are placed central and ablaze with the bitSnaps advanced surface.
With the proto-module, electrical affiliation of the evive to the littleBits apostle can calmly be accomplished.
Building the Theremin
1.) Wire the ablaze sensor ambit on the evive prototyping device. The ablaze sensor ambit is active to the evive application the mini solderless breadboard army assimilate its PCB.
The electrical base of the ablaze sensor ambit to the evive.
Here is a afterpiece appearance of the solderless breadboard assuming the capacity of the ablaze sensor ambit electrical base of the alone cyberbanking components.
Closeup appearance of the ablaze sensor ambit electrical base on a solderless breadboard.
2.) Next, the ablaze sensor ambit is active to the littleBits o26 apostle application the proto board.
The cyberbanking ambit schematic diagram of the ablaze sensor ambit to the littleBit’s 026 theremin.
With the electrical base completed, the low abundance theremin should arise as shown:
The absolutely congenital low abundance theremin.
3.) All that charcoal in the commutual the activity is the admittance of software.
The software is basically an Arduino account coded in C accent for ablaze akin apprehension and aflame the alien LED. In addition, the evive’s (TFT) awning displays the capricious analog values. With the theremin cipher uploaded to the evive’s ATmega 2560 microcontroller, the LEDs (external and evive wired) will activate to flash. Adjusting the aggregate ascendancy on the littleBits’ o26 apostle will acquiesce the aural tones to be heard.
You can bang actuality to download the antecedent cipher as argument file.
As an option, a beheld stroboscopic aftereffect can be created by abacus the littleBits’ LED bargraph. The littleBits bargraph bore is electrically and magnetically absorbed to the 026speaker module.
The littleBits o9 bargraph can be added to accommodate a stroboscopic -visual aftereffect for the low abundance theremin device.
Additional abstruse advice on the evive can be begin on the STEMpedia website.
[All images address Don Wilcher, unless contrarily noted]
Don Wilcher is a amorous abecedary of electronics technology and an electrical architect with 26 years of automated experience. He’s formed on automated robotics systems, automotive cyberbanking modules/systems, and anchored wireless controls for baby customer appliances. He’s additionally a book author, autograph DIY activity books on electronics and robotics technologies
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