LARA hat
About the LARA hat
LARA hat is an open source Raspberry Pi PCB design by LuHer10, published on GitHub under the CC-BY-NC-4.0 license. It is a 2-layer board measuring 65 × 56 mm, with 31 components from 23 distinct parts.
Its main chip is the Raspberry_Pi_4, from the Raspberry Pi family. Other key parts include the MCP2515-xSO, SN65HVD230, 74LVC2G241 and Buck 12V - 5V. By type, the board carries 10 resistors, 7 connectors, 5 diodes, 4 ICs, 4 capacitors and 1 crystal.
It belongs with the robotics & motion and dev boards & breakouts designs in this gallery.
From the project
LARA: Low-cost Assistive Robot Arm
Main components on the LARA hat
LARA hat bill of materials (BOM)
31 components, 23 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | MCP2515-xSO | SOIC-18W_7.5x11.6mm_P1.27mm | U1 |
| 1 | SN65HVD230 | SOIC-8_3.9x4.9mm_P1.27mm | U2 |
| 1 | 74LVC2G241 | VSSOP-8_3x3mm_P0.65mm | U3 |
| 1 | Buck 12V - 5V | BUCK12-5 | U4 |
| 1 | 8MHz | Crystal_HC49-4H_Vertical | Y1 |
| 1 | Raspberry_Pi_4 | PinHeader_2x20_P2.54mm_Vertical | J1 |
| 1 | Conn_RoboClaw | JST_PH_B3B-PH-K_1x03_P2.00mm_Vertical | J2 |
| 1 | Conn_Dynamixel | JST_EH_B3B-EH-A_1x03_P2.50mm_Vertical | J3 |
| 1 | Conn_01x02_Pin | JST_PH_B2B-PH-K_1x02_P2.00mm_Vertical | J4 |
| 1 | 12V in | TerminalBlock_MaiXu_MX126-5.0-02P_1x02_P5.00mm | J5 |
| 1 | LED_JST | JST_PH_B4B-PH-K_1x04_P2.00mm_Vertical | J6 |
| 1 | I2C_JST | JST_PH_B4B-PH-K_1x04_P2.00mm_Vertical | J7 |
| 1 | Rx_LED | LED_0805_2012Metric_Pad1.15x1.40mm_HandSolder | D1 |
| 1 | Tx_LED | LED_0805_2012Metric_Pad1.15x1.40mm_HandSolder | D2 |
| 1 | S0 | LED_0805_2012Metric_Pad1.15x1.40mm_HandSolder | D3 |
| 1 | S1 | LED_0805_2012Metric_Pad1.15x1.40mm_HandSolder | D4 |
| 1 | S2 | LED_0805_2012Metric_Pad1.15x1.40mm_HandSolder | D5 |
| 2 | 22p | C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C1, C2 |
| 1 | 0.1u | C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C3 |
| 1 | 1u | C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C4 |
Show 3 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 4 | 10k | R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R1, R2, R3, R4 |
| 1 | 120 | R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R5 |
| 5 | 68 | R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R6, R7, R8, R9, R10 |
LARA hat design files
The KiCad project lives in the LuHer10/LARA repository on GitHub; these links point at the commit this page was built from.
LARA hat: common questions
What microcontroller does the LARA hat use?
The LARA hat is built around the Raspberry_Pi_4, from the Raspberry Pi family.
How big is the LARA hat?
The LARA hat measures 65 × 56 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the LARA hat?
31 components, from 23 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 LARA hat design files?
From the LuHer10/LARA repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.
Can I use the LARA hat 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 LARA hat without the hardware?
Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug Raspberry Pi firmware against it before you order a PCB.
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