SirGrab
About the SirGrab PCB
SirGrab is an open source PCB design by Will946, published on GitHub under the MIT license. It is a 2-layer board measuring 71.1 × 28 mm, with 44 components from 11 distinct parts.
Other key parts include the PCA9685. By type, the board carries 26 resistors, 6 jumpers, 2 capacitors, 1 IC, 1 transistor and 1 connector.
It belongs with the robotics & motion designs in this gallery.
From the project
3D-printed robotic arm controlled live in the browser via 3D sliders, driven by an Arduino Uno R3 and a PCA9685 PWM servo board. Like a claw machine, minus the part where you never actually win.
A 3D-printed robotic arm, driven by an Arduino Uno R3 and a PCA9685 PWM servo board, controlled through a live 3D interface in the browser.
The PCA9685 is a 16-channel PWM driver board built around Adafruit's Arduino-based PWM servo driver design, controlled here by an Arduino Uno R3. The Arduino doesn't drive the servos directly. It talks to the PCA9685 over I2C, and the board generates all 16 PWM signals on its own. This is what lets a single Arduino control far more servos than its own pins could handle directly, without fighting timer conflicts.
Main components on the SirGrab
SirGrab bill of materials (BOM)
44 components, 11 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | PCA9685 | TSSOP28 | U1 |
| 1 | IRLML6401 | SOT23-WIDE | Q1 |
| 1 | TERMBLOCK_1X2-3.5MM | 1X2-3.5MM | J1 |
| 4 | — | 3X04 | JP1, JP2, JP5, JP6 |
| 2 | — | 1X06-CLEANBIG | JP3, JP4 |
| 6 | — | SOLDERJUMPER_REFLOW_NOPASTE | SJ_A0, SJ_A1, SJ_A2, SJ_A3, SJ_A4, SJ_A5 |
| 1 | VCC | CHIPLED_0805 | LED1 |
| 1 | 10uF | 0805 | C1 |
| 1 | — | E3,5-8 | C2 |
| 9 | 10K | 0805 | R1, R2, R3, R4, R5, R6, R7, R8 +1 |
| 17 | 220 | 0805 | R10, R11, R12, R13, R14, R15, R16, R17 +9 |
SirGrab design files
The KiCad project lives in the Will946/SirGrab repository on GitHub; these links point at the commit this page was built from.
- LayoutPCA9685/PCA9685.kicad_pcb
- SchematicPCA9685/PCA9685.kicad_sch
SirGrab: common questions
How big is the SirGrab PCB?
The SirGrab measures 71.1 × 28 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the SirGrab?
44 components, from 11 distinct parts. The full bill of materials is listed on this page.
Where can I download the SirGrab design files?
From the Will946/SirGrab repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.
Can I use the SirGrab design in my own project?
Yes, under the terms of its MIT license, which Will946 chose for the repository.
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