Tachometer
About the Tachometer PCB
Tachometer is an open source AVR/Arduino PCB design by UofA-BAJA, published on GitHub. It is a 2-layer board measuring 80 × 85 mm, with 24 components from 18 distinct parts.
Its main chip is the ARDUINO_NANO, from the AVR/Arduino family. Other key parts include the NE555P and LM311. By type, the board carries 9 resistors, 4 capacitors, 3 connectors, 2 ICs, 2 diodes and 1 transistor.
From the project
The software behind the electrical system in Baja Wildcat Racing.
The software behind the electrical system in Baja Wildcat Racing.
This is the BAJA Wildcat Racing team for school year 2024-2025.
Check out the 'doc' (documentation) folder in order to get started!
Main components on the Tachometer
Tachometer bill of materials (BOM)
24 components, 18 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | NE555P | DIP-8_W7.62mm | U1 |
| 1 | LM311 | DIP-8_W7.62mm | U2 |
| 1 | NPN | TO-92L_Inline | Q1 |
| 2 | Conn_01x02 | SolderWire-0.75sqmm_1x02_P4.8mm_D1.25mm_OD2.3mm | J1, J3 |
| 1 | CAN to outer connector | SolderWire-0.1sqmm_1x04_P3.6mm_D0.4mm_OD1mm | J4 |
| 1 | ARDUINO_NANO | SHIELD_ARDUINO_NANO | UNIT_1 |
| 1 | HiLetgo CAN Bus | CAN Bus (Feb 2025) | UNIT_2 |
| 1 | 3362P-1-103 | TRIM_3362P-1-103 | VR1 |
| 1 | ~ | D_A-405_P7.62mm_Horizontal | D1 |
| 1 | D | D_A-405_P7.62mm_Horizontal | D2 |
| 3 | 10u | CP_Radial_D5.0mm_P2.50mm | C1, C2, C3 |
| 1 | C | C_Disc_D6.0mm_W4.4mm_P5.00mm | C4 |
| 1 | 10 | R_Axial_DIN0411_L9.9mm_D3.6mm_P15.24mm_Horizontal | R1 |
| 1 | 470 | R_Axial_DIN0411_L9.9mm_D3.6mm_P15.24mm_Horizontal | R2 |
| 1 | 1k | R_Axial_DIN0411_L9.9mm_D3.6mm_P15.24mm_Horizontal | R3 |
| 2 | 430 | R_Axial_DIN0411_L9.9mm_D3.6mm_P15.24mm_Horizontal | R4, R6 |
| 3 | 10k | R_Axial_DIN0411_L9.9mm_D3.6mm_P15.24mm_Horizontal | R5, R10, R11 |
| 1 | 2k | R_Axial_DIN0411_L9.9mm_D3.6mm_P15.24mm_Horizontal | R7 |
Tachometer design files
The KiCad project lives in the UofA-BAJA/2024-2025-Firmware 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 ARDUINO_NANO, from the AVR/Arduino family.
How big is the Tachometer PCB?
The Tachometer measures 80 × 85 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Tachometer?
24 components, from 18 distinct parts. The full bill of materials is listed on this page.
Where can I download the Tachometer design files?
From the UofA-BAJA/2024-2025-Firmware repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.
Can I use the Tachometer design in my own project?
The repository has no license, so all rights stay with UofA-BAJA. Use it as a reference, and ask the author before reusing the design.
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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