Lathe Tachometer
Feat. Arduino Micro & OLED
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Gerber file
CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor GREEN and GOLD 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.
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Components
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.
Want to learn more about our BOM list? Read the BOM list article for extra information.
Component list
Component List
Resistors
R1,R5 = 390 Ohm 5%, 0.25 W
R2,R4 = 10 kOhm 5%, 0.25 W
R3 = 100 Ohm 5%, 0.25 W
R4 = 22 kOhm 5%, 0.25 W
Capacitors
C1,C2,C3 = 100 nF 10%, 100 V, 5 mm pitch
C3 = 10 nF 10%, 100 V, 5 mm pitch
Semiconductors
D1 = 1N4148
IC1 = 78L05Z
LED1 = LED, yellow, 3 mm
LED2 = LED, 3 mm, color t.b.d., optional, see text
Miscellaneous
MOD1 = Arduino Micro
S1 = pushbutton, PCB mount, 6 x 6 x 9.5 mm
SV1 = 8-way pinheader receptacle
K2 = 4-way pinheader receptacle
K1 = 9V battery connector clip + wires
Reflective Optical Sensor, like TCRT5000 Monochrome 0.96”, 128 x 64 pixels
OLED graphic display, 8-pin, Adafruit # 326 (UG-2864HSWEG01)
34-pin DIP socket for Arduino Micro (DIY from SIL pinheader receptacles)
Elektor PCB # 130470-1
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Discussion (0 comments)
Consiglio Iannuzzi 5 years ago
jordaaaa 5 years ago
The purpose is just to protect the Arduino/Oled in case you get your wires crossed so I suggets you use something like a 1N4007 or even a 1N4148 will do.
If you want, you could just replace it with a wirelink and trust the regulator to survive a possible reverse polarity.
In my setup the power came from another system/part and I wanted to protect my circuit incase the supply side gets modified.
Hope this helps
Consiglio Iannuzzi 5 years ago