HardLabs

Reef piHat

Ranthalion·reef-piHat·v3/reef-piHat.kicad_pcb

Reef piHat PCB layout, top view — open source board by Ranthalion

About the Reef piHat PCB

Reef piHat is an open source PCB design by Ranthalion, published on GitHub. It is a 2-layer board measuring 65 × 56 mm, with 99 components from 32 distinct parts.

Other key parts include the PCA9685PW and ULN2803A. By type, the board carries 39 resistors, 35 diodes, 16 connectors, 2 ICs, 2 transistors and 1 capacitor.

It belongs with the dev boards & breakouts and sensors designs in this gallery.

From the project

RPI Hat for reef-pi

Supports - Back powering the rpi with 5v - 12 channels of PWM control via PCA9685 (split between 4 connectors) with address selection - 3 channels for 1 wire communication (up to 3 DS18B20 temperature probes) - 2 i2c ports for ph probe modules - 2 ATO sensors with input protection - 8 channel 12v relay control via ULN2803 - 8 GPIO breakout with input and output protection

Reef piHat, from the project README
From the project README

Main components on the Reef piHat

PCA9685PWULN2803A

Reef piHat bill of materials (BOM)

99 components, 32 distinct parts.

QtyPartRefs
1
PCA9685PW
U1
1
ULN2803A
U3
1
DMMT5401
Q1
1
DMG2305UX
Q2
1
Doser
J1
1
Light1
J2
1
40HAT
J3
1
Light2
J4
1
12vPower
J5
1
Power2
J6
1
Power1
J7
1
ATO1
J8
1
Light3
J9
1
ATO2
J10
2
I2C
J11, J12
1
5vPower
J13
1
Temp1
J14
1
Temp2
J15
1
Temp3
J16
4
3mm_Mounting_Hole
H1, H2, H3, H4
Show 12 more
QtyPartRefs
10
z3.3
D1, D2, D3, D4, D5, D6, D7, D8 +2
1
LED_Small
D11
24
LED
D12, D13, D14, D15, D16, D17, D18, D19 +16
1
1uF
C1
3
220
R1, R2, R3
1
R_Small
R4
1
R
R5
2
22
R6, R7
24
1k
R8, R9, R10, R11, R12, R14, R15, R16 +16
1
4.7k
R13
2
10k
RN1, RN2
5
220
RN3, RN4, RN5, RN6, RN7

Reef piHat design files

The KiCad project lives in the Ranthalion/reef-piHat repository on GitHub; these links point at the commit this page was built from.

Reef piHat: common questions

How big is the Reef piHat PCB?

The Reef piHat measures 65 × 56 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Reef piHat?

99 components, from 32 distinct parts. The full bill of materials is listed on this page.

Where can I download the Reef piHat design files?

From the Ranthalion/reef-piHat repository on GitHub, which has the KiCad layout; the links under Design files point to each one.

Can I use the Reef piHat design in my own project?

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

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