HardLabs

R3926lp

cyril279·keyboards·revlp/39_1350/39_1350_pcb/r3926lp.kicad_pcb

R3926lp PCB layout, top view — open source AVR/Arduino board by cyril279
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About the R3926lp PCB

R3926lp is an open source AVR/Arduino PCB design by cyril279, published on GitHub under the MIT license. It is a 2-layer board measuring 238.7 × 94.9 mm, with 120 components from 10 distinct parts.

Its main chip is the C32574, from the AVR/Arduino family. By type, the board carries 40 resistors, 39 switches, 39 diodes, 1 IC and 1 transistor.

It belongs with the keyboards designs in this gallery.

From the project

Backlighting notes: 1. The resistor value needed is determined by specific characteristics of the led's chosen, as well as the voltage supplied by the controller. The specific characteristics can differ for various types and colors of led's. 2. Use an led calculator to determine

Backlighting notes: 1. The resistor value needed is determined by specific characteristics of the led's chosen, as well as the voltage supplied by the controller. The specific characteristics can differ for various types and colors of led's. 2. Use an led calculator to determine the resistor value (all ⅛ watt): Recommendation: Use minimum resistor needed to protect led, then limit brightness via BACKLIGHTLIMITVAL to limit the max to a reasonable value (PWM manged, so more power efficient) 3. VCC voltage is different for nice!nano from pro-micro; pin 24 is raw on pro-micro, but not on elite-c.…

Main components on the R3926lp

C32574

R3926lp bill of materials (BOM)

120 components, 10 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
C32574
ProMicro
U1
1
C15127
AO3416 N-channel MOSFET
Q1
39
SW_Push
SW0, SW1, SW2, SW3, SW4, SW5, SW10, SW11 +31
13
D
D0, D43, D44, D45, D50, D51, D52, D53 +5
26
C81598
D
D1, D2, D3, D4, D5, D10, D11, D12 +18
34
R
R0, R10, R11, R12, R13, R14, R15, R20 +26
2
C27834
R
R1, R3
2
C17414
R
R2, R4
1
C17513
R
R5
1
4.7k 0204
R80

R3926lp design files

The KiCad project lives in the cyril279/keyboards repository on GitHub; these links point at the commit this page was built from.

R3926lp: common questions

What microcontroller does the R3926lp use?

The R3926lp is built around the C32574, from the AVR/Arduino family.

How big is the R3926lp PCB?

The R3926lp measures 238.7 × 94.9 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the R3926lp?

120 components, from 10 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 R3926lp design files?

From the cyril279/keyboards repository on GitHub, which has the KiCad layout and the BOM; the links under Design files point to each one.

Can I use the R3926lp design in my own project?

Yes, under the terms of its MIT license, which cyril279 chose for the repository.

Can I test firmware for the R3926lp 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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