Tachometer
About the Tachometer PCB
Tachometer is an open source AVR/Arduino PCB design by PotatoX, published on GitHub under the CC-BY-NC-4.0 license. It is a 2-layer board measuring 78.6 × 60.8 mm, with 48 components from 28 distinct parts.
Its main chip is the ArduinoProMini, from the AVR/Arduino family. Other key parts include the LM1117-5.0, TSP-05 and PCF8574. By type, the board carries 12 transistors, 6 connectors, 5 fuses, 4 ICs, 4 LEDs and 4 diodes.
From the project
Cheap benchtop wood cutting band saw -> decent metal cutting
Recently I needed (had an excuse to get) a band saw capable of cutting metal for a few of my projects. As with most of my projects/hobbies there are a number of outcomes I seek:
To this end I started shopping around to acquire a band saw as cheap as possible as it would only be used on a limited basis for hobby work. I need the saw to be able to cut metal and fit a small foot print on my bench. I wanted the saw to be vertical in order to minimize the space consumed as my bench and garage space is at a premium at this point.
Main components on the Tachometer
Tachometer bill of materials (BOM)
48 components, 28 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | ArduinoProMini | pro_mini | IC1 |
| 1 | LM1117-5.0 | SOT-223-3_TabPin2 | U2 |
| 1 | TSP-05 | TSP | U3 |
| 1 | PCF8574 | SO-16-W | U5 |
| 12 | MMBT3906 | SOT-23 | Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8 +4 |
| 1 | DC-005 | ADC-002 | CON1 |
| 2 | CONN_01X01 | Male_Terminal_Spade_Connector_6.3_Wide_5.08mm_Pins | P1, P2 |
| 2 | CONN_01X02 | Pin_Header_Straight_1x02_Pitch2.54mm | P3, P4 |
| 1 | CONN_01X03 | Pin_Header_Straight_1x03_Pitch2.54mm | P7 |
| 1 | 1A | Fuse_TE5_Littlefuse-395Series | F1 |
| 1 | 2A 16V | Fuse_SMD1206_HandSoldering | F2 |
| 1 | 1000MA 1000mA | Fuseholder5x20_horiz_open_inline_Type-I | F3 |
| 1 | 500MA 500mA | R_0603_HandSoldering | F4 |
| 1 | 500MA 500mA | Fuse_TE5_Littlefuse-395Series | F5 |
| 1 | 150 | R_Array_Convex_4x0603 | RP1 |
| 1 | 10K | R_Array_Convex_4x0603 | RP2 |
| 2 | 91 | R_Array_Convex_4x0603 | RP3, RP4 |
| 2 | 100 | R_Array_Convex_4x0603 | RP5, RP6 |
| 1 | 510 | R_Array_Convex_4x0603 | RP7 |
| 1 | NTC 5D-7 | RV_Disc_D7_W5.1_P5 | TH1 |
Show 8 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | 14D241K 240V | VARISTOR_MCIGICM_14D241K_240V | VR1 |
| 4 | LTS-6960HR | 7SegmentLED_LTS6760_LTS6780 | AFF1, AFF2, AFF3, AFF4 |
| 1 | 12V | D_MELF_Handsoldering | D1 |
| 1 | 5.1V | D_MELF_Handsoldering | D2 |
| 1 | Power | LED_1206_HandSoldering | D3 |
| 1 | Pickup | LED_1206_HandSoldering | D4 |
| 2 | 10UF 10uF | CP_Elec_6.3x5.3 | C1, C3 |
| 2 | 22UF 22uF | C_1206_HandSoldering | C2, C4 |
Tachometer design files
The KiCad project lives in the PotatoX/Band_Saw_Conversion repository on GitHub; these links point at the commit this page was built from.
Tachometer: common questions
What microcontroller does the Tachometer use?
The Tachometer is built around the ArduinoProMini, from the AVR/Arduino family.
How big is the Tachometer PCB?
The Tachometer measures 78.6 × 60.8 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Tachometer?
48 components, from 28 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.
Where can I download the Tachometer design files?
From the PotatoX/Band_Saw_Conversion repository on GitHub, which has the KiCad layout and the BOM; the links under Design files point to each one.
Can I use the Tachometer design in my own project?
It is published under CC-BY-NC-4.0, which limits how it may be reused; read the license before building on it.
Can I test firmware for the Tachometer without the hardware?
Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug AVR/Arduino firmware against it before you order a PCB.
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