HardLabs

Dimmer

edwindertien·foundscape·teensyDimmer/kicad/dimmer.kicad_pcb

Dimmer PCB layout, top view — open source RP2040/RP2350 board by edwindertien

About the Dimmer PCB

Dimmer is an open source RP2040/RP2350 PCB design by edwindertien, published on GitHub. It is a 2-layer board measuring 105.4 × 76.5 mm, with 94 components from 57 distinct parts.

Its main chip is the RP2350B, from the RP2040/RP2350 family. Other key parts include the Teensy-LC, 74LVC1G126, LMR54410FDBVR, RMC20452T and HCPL-0631-500E. By type, the board carries 26 resistors, 20 diodes, 17 connectors, 9 ICs, 9 capacitors and 8 transistors.

It belongs with the audio designs in this gallery.

From the project

midi control of things that tap and go boink

Two behaviours exist on the main board right now which can be set using a small dip switch: either pulse-lenght or pwm duty cycle as third 'velocity' argument in a MIDI command.

current version (still in operation) uses an ATmega328 (started out with the ATmega8 and then the ATmega88 in WinAVR. now it uses the Arduino environment). In the meantime a version has been made using Teensy, but has not been further pursued / produces (when Teensies were made of nonobtanium). On the wishlist a new version with pico

Main components on the Dimmer

Teensy-LC74LVC1G126LMR54410FDBVRRMC20452THCPL-0631-500ETLV74311PDBVRSRV05-4-P-T7RP2350BISO7740DWR

Dimmer bill of materials (BOM)

94 components, 57 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
Teensy-LC
U1
1
74LVC1G126
L7812
U2
1
LMR54410FDBVR
6N138
U3
1
RMC20452T
L7805
U4
1
HCPL-0631-500E
MAX481E
U5
1
TLV74311PDBVR
ICL7667
U6
1
SRV05-4-P-T7
ICL7667
U7
1
RP2350B
ICL7667
U8
1
ISO7740DWR
ICL7667
U9
1
12MHZ
IRLZ44N
Q1
7
IRLZ44N
Q2, Q3, Q4, Q5, Q6, Q7, Q8
1
GT-USB-7010ASV
Conn_01x02
J1
1
CONN_01X03_SOCKET
Barrel_Jack_Switch
J2
1
SCREW_TERMINAL_01X03
USB_B
J3
1
SCREW_TERMINAL_01X03
MIDI-in
J4
1
SCREW_TERMINAL_01X03
oled display
J5
1
SCREW_TERMINAL_01X03
RJ45_LED_Shielded
J6
1
SCREW_TERMINAL_01X02
Conn_01x04
J7
1
CONN_01X04
RS485
J8
1
RJ45_Shielded
J9
Show 37 more
QtyPartRefs
6
Conn_01x02
J10, J13, J14, J15, J16, J17
2
RJ45
Conn_01x02
J11, J12
1
Fuse
F1
1
separate logic and power
JP4
1
power on bus
JP5
1
C318884
Rotary_Encoder_Switch
SW1
1
SW_DIP_x04
SW2
1
SM6T24A
1N4148
D1
1
XL-1010RGBC-2812B
red
D2
1
XL-1010RGBC-2812B
yellow
D3
1
BAT54AW
green
D4
1
BAT54AW
grn
D5
4
grn
D6, D7, D8, D9
1
SMAJ18A-13-F
grn
D10
1
DSS110
grn
D11
1
SS5P4HM3_A/H
grn
D12
1
BZT52C5V6
1N4007
D13
3
1N4007
D14, D15, D17
1
SS34
1N4007
D16
3
XL-1010RGBC-2812B
1N4007
D18, D19, D20
1
100NF
10uF
C1
2
100NF
100nF
C2, C5
2
100NF
100uF
C3, C4
1
C19702
100nF
C6
2
100NF
100nF
C7, C8
1
C13585
100nF
C9
3
470R
220R
R1, R12, R15
1
10K
470R
R2
5
220R
R3, R9, R11, R13, R16
2
5.1K
220R
R4, R5
2
10k
R6, R8
1
120R
R7
2
10K
220R
R10, R18
2
620R
220R
R14, R17
1
10R
R19
5
10K
10R
R20, R21, R22, R23, R24
2
470R
10R
R25, R26

Dimmer design files

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

Dimmer: common questions

What microcontroller does the Dimmer use?

The Dimmer is built around the RP2350B, from the RP2040/RP2350 family.

How big is the Dimmer PCB?

The Dimmer measures 105.4 × 76.5 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Dimmer?

94 components, from 57 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 Dimmer design files?

From the edwindertien/foundscape 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 Dimmer design in my own project?

The repository has no license, so all rights stay with edwindertien. Use it as a reference, and ask the author before reusing the design.

Can I test firmware for the Dimmer without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug RP2040/RP2350 firmware against it before you order a PCB.

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