The batteries power a 5V step-up module necessary to power the Arduino, the amplifier and the MPU6050 module. The switches were removed and the wires passed through the underside of the boxes so as to be invisible from the outside. The smaller level served as the initial prototype for this project.īoth levels use switched battery boxes, AAA batteries used in the smaller level and AAs in the larger level. The hardware is set out within to give the best horizontal balance possible when the levels are used to position a surface prone to movement as in the case of a suspended turntable. Finally, a pair of pushbuttons toggle power and give access to a single-button menu system to alter various settings, discussed in the software section below.īoth levels use aluminium U-Channel for their casework. Power is via a three-volt battery set with a step up supply, and miniature mylar speakers are used for sound output. You could also assemble one on a piece of stripboard, or use a miniature class D amplifier like the PAM8403.
Though it sounds quite robotic by modern standards, it is ideal for reading basic words and numbers without any additional hardware besides an amplifier and speaker.Īmplification is courtesy of an LM386 for which pre-built modules containing a simple circuit are readily available online. Talkie is a software implementation of the Texas Instruments ‘Linear Predictive Coding’ speech synthesis architecture designed to run on the Arduino. I wanted to use the Talkie speech library and so chose a clone of the Atmega 328-based Arduino Nano as the microcontroller for which the library is designed. THey’re often used for positional sensing in drones, robots, RC cars and tools, but have many uses besides including highly accurate angle measurement. The levels are based around an MPU6050 three-axis accelerometer and gyroscope contained within a single chip, readily available as a breakout module suitable for use with common microcontrollers. I have one of those and it’s not especially accurate. There was a device available some years ago which could indicate level by a change in pitch and staccato beeps as you got closer to the zero point.
Levels are visual devices by nature, and few if any exist that can output auditory readings be they spoken or tones. Less common are electronic levels, which can measure angles using an accelerometer, magnetic sensors or an angular tilt switch and display the readings on an LCD screen. Bull’s eye levels hold the liquid beneath a convex glass face with a central circle and can level across a plane. The most common contain a vial filled with a coloured spirit or alcohol which forms a bubble within the constant inner diameter at the viewing points.
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