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Lathe Tachometer

Feat. Arduino Micro & OLED

Lathe Tachometer
Here’s a non-invasive, all electronic add-on to display the running speed (rpm) of your lathe or milling machine, be it CNC or vintage. It’s state of the art—witness the use of an Arduino Micro board and a .96 inch OLED display for instantaneous readout. The little instrument also has a clock displaying the equipment running time.
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Gerber file

CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor Members can exclusively download these files for free as part of their Membership. Gerber files allow a PCB to be produced on an appropriate device available locally, or through an online PCB manufacturing service. Elektor recommends its business partner Eurocircuits as the company of choice for its own prototypes and volume production in selected cases.

Components
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The BOM (Bill of Materials) is the technically exhaustive listing of parts and other hardware items used to produce the working and tested prototype of any Elektor Labs project. The BOM file contains deeper information than the Component List published for the same project in Elektor Magazine. If required the BOM gets updated directly by our lab engineers. As a reader, you can download the list here.
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Component List
Resistors
R1,R5 = 390Ohm 5%, 0.25W
R2,R4 = 10kOhm 5%, 0.25W
R3 = 270Ohm 100Ohm 5%, 0.25W
R4 = 22kOhm 5%, 0.25W
Capacitors
C1,C2,C3 = 100nF 10%, 100V, 5mm pitch
C3 = 10nF 10%, 100V, 5mm pitch
Semiconductors
IC1 = 78L05Z
LED1 = LED, yellow, 3mm
LED2 = LED, 3mm, color t.b.d., optional, see text
Miscellaneous
MOD1 = Arduino Micro, Farnell/Newark # 2285194
S1 = pushbutton, PCB mount, 6x6x9.5mm
SV1 = 8-way pinheader receptacle
K2 = 4-way pinheader receptacle
K1 = 9V battery connector clip + wires
Reflective Optical Sensor, like TCRT5000
Monochrome 0.96” 128x64 OLED graphic display, Adafruit # 326 (UG-2864HSWEG01)
34-pin DIP socket for Arduino Micro (DIY from SIL pinheader receptacles)
PCB # 130470-1

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