2 layers79.9 × 41.4 mm
GR ESP32-A1S
GadgetReboot/ESP32-A1S
Breakout PCB for the ESP32-A1S module including an audio amp and basic GPIO headers, USB interface
65 parts27
2 layers187 × 76 mm
Calyx level carrier
ballhog/calyx-levelWired, fail-safe auto top-off (ATO) for a reef system. Part of the Corallite Calyx family (wired connected devices: Calyx-Outlet, Calyx-Sense, Calyx-Level).
- Size
- 187 × 76 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 106
- Nets
- 65
- Pads
- 262
- Tracks, vias
- 704, 51
- Pours
- 3
- Routed
- Yes
- KiCad
- KiCad 7 (file 20221018)
- Created
- 23 Oct 2026
- Updated
- 26 Oct 2026
Overview
Calyx level carrier is an open-source printed circuit board by ballhog, from the ballhog/calyx-level repository on GitHub. It is a 2-layer board of 187 × 76 mm with 106 parts on 65 nets, routed with 704 tracks and 51 vias.
It is built around the PESD5V0S1BL, 1N4148W and SS34, with the IRLML0040, MMBT3904 and MS 2 among its other parts. Its parts include 40 resistors, 15 diodes, 15 connectors, 11 capacitors and 2 transistors.
Main components
7
PESD5V0S1BL
DFN1006-2-65℃~+150℃ 1 12A@8/20us 130W@8/20us 14V 35pF 5V 5nA 9.5V Bidirectional ESD IEC 61000-4-2、IEC 61000-4-5 DFN1006-2 ESD and Surge Protection (TVS/ESD) ROHSNexperiaESD And Surge Protection (TVS/ESD)
1N4148W
SOD-123150mA 1A 1V@50mA 1uA@75V 400mW 4ns 75V Independent SOD-123 Switching Diodes ROHSSTMicroelectronicsSwitching Diodes
SS34
SMA(DO-214AC)-55℃~+125℃ 3A 40V 500uA@40V 550mV@3A Independent SMA(DO-214AC) Schottky Diodes ROHSMDDSchottky Diodes
IRLML0040
SOT-23-55℃~+150℃ 1 N-channel 1.3W 2.5V 266pF 29pF 3.6A 3.9nC 40V 56mΩ@10V SOT-23 MOSFETs ROHSGuangdong HottechMOSFETsMMBT3904
SOT-23-55℃~+150℃ 1 NPN 100 100nA 200mA 200mW 300MHz 300mV 40V 6V NPN SOT-23 Bipolar (BJT) ROHSJiangsu Changjing Electronics Technology (CJ)Bipolar (BJT)MS 2
-- Disposable fuses ROHSBel FuseDisposable FusesSMAJ24CA
DO-214AC(SMA)-55℃~+150℃ 10.3A 24V 26.7V 38.9V 400W 5uA Bidirectional TVS DO-214AC(SMA) ESD and Surge Protection (TVS/ESD) ROHSGOODWORKESD And Surge Protection (TVS/ESD)
README
README.mdCalyx-Level
Wired, fail-safe auto top-off (ATO) for a reef system. Part of the Corallite Calyx family (wired connected devices: Calyx-Outlet, Calyx-Sense, Calyx-Level).
Built for Joe's own tank first. Each step should be useful on its own; it becomes a product only if it proves itself.
In one paragraph
A sensor node at the sump reads the water level and the RO reservoir, and while water is needed it keeps handing a short run permission (lease) over Ethernet to a pump node at the RO station. The pump node runs the pump only while it holds a fresh lease and stays inside its own limits (run time, off time, daily volume). Anything that breaks (cable, switch, either node, firmware) makes the lease run out and the pump stop. A hardwired high-level float cuts pump power in series, with no firmware or network in the path. Both nodes are Olimex ESP32-POE-ISO boards on a blank Arduino Uno proto shield, so off-the-shelf Uno shields plug straight in.
Docs
| Doc | What's in it |
|---|---|
| docs/design.md | How it works: roles, lease protocol, limits, sensor health, failure table, reporting |
| docs/parts.md | Parts list (bench build and per node), with what's already on hand |
| docs/schematic.md | Wiring, pin map (Uno names ↔ ESP32 GPIO), input/output circuits, power |
| docs/provisioning.md | First flash, node role and id, Coeno OTA, publishing builds |
| hardware/DESIGN.md | KiCad carrier rev A: schematic, PCB, build options, checks before ordering |
Status (2026-10-26)
Carrier PCB rev A designed (schematic + routed board, DRC copper-clean; see hardware/DESIGN.md). No firmware yet. Coeno already serves /firmware/calyx-level/latest.json (Coeno b9fa573).
Related
- Corallite project docs: Corallite ATO - architecture 2026-10-22 (the decisions this repo implements), Corallite doser - E4 controller 2026-10-22, Salt swap doser - parked 2026-10-20.
- ballhog/calyx-sense: same board family, same OTA client.
- Coeno
firmware/calyx-level/andcoeno/api/routes/firmware.py: the OTA server.
Rules that don't bend
- Safety lives on the boxes. Xanthe and Coeno read and alert; they never switch the pump.
- The high-level cutoff is hardware in series with pump power. It is never a shield input or a firmware decision.
- No network message ever means "run". Only a fresh lease does, and silence means stop.
Parts
106| Qty | Value | Footprint | References |
|---|---|---|---|
| 11 | 10k | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R11, R21, R31, R41, R51, R61, R72, R73, R75, R77, R78 |
| 7 | 100R | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R10, R20, R30, R40, R50, R60, R76 |
| 7 | 1k | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R12, R22, R32, R42, R52, R62, R71 |
| 6 | 0R | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R14, R24, R34, R44, R54, R64 |
| 6 | 100nF | Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C10, C20, C30, C40, C50, C60 |
| 6 | 20k DNP | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R13, R23, R33, R43, R53, R63 |
| 6 | PESD5V0S1BL | Diode_SMD:D_SOD-323 | D10, D20, D30, D40, D50, D60 |
| 4 | M3 | MountingHole:MountingHole_3.2mm_M3 | H1, H2, H3, H4 |
| 2 | 100nF 50V | Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C2, C4 |
| 2 | 1N4148W | Diode_SMD:D_SOD-123 | D4, D71 |
| 2 | SS34 | Diode_SMD:D_SMA | D1, D6 |
| 1 | +3V3 | TestPoint:TestPoint_Pad_D1.5mm | TP5 |
| 1 | +5V | TestPoint:TestPoint_Pad_D1.5mm | TP4 |
| 1 | +VIN | TestPoint:TestPoint_Pad_D1.5mm | TP1 |
| 1 | 100mA hold | Fuse:Fuse_1812_4532Metric | F2 |
| 1 | 100uF 35V | Capacitor_THT:CP_Radial_D6.3mm_P2.50mm | C3 |
| 1 | 10k DNP | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R79 |
| 1 | 10uF | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C7 |
| 1 | 10uF 50V | Capacitor_SMD:C_1206_3216Metric_Pad1.33x1.80mm_HandSolder | C1 |
| 1 | 2A | Fuse:Fuseholder_Littelfuse_Nano2_154x | F1 |
| 1 | 330R | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R70 |
| 1 | 4.7k | Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder | R74 |
| 1 | 5V active | Buzzer_Beeper:Buzzer_12x9.5RM7.6 | BZ1 |
| 1 | BLUE | LED_SMD:LED_0603_1608Metric | D70 |
| 1 | EXT1 | Connector_PinSocket_2.54mm:PinSocket_1x10_P2.54mm_Vertical | J1 |
| 1 | EXT2 | Connector_PinSocket_2.54mm:PinSocket_1x10_P2.54mm_Vertical | J2 |
| 1 | G5LE-1 DC24 | Relay_THT:Relay_SPDT_Omron-G5LE-1 | K1 |
| 1 | GATE | TestPoint:TestPoint_Pad_D1.5mm | TP3 |
| 1 | GND | TestPoint:TestPoint_Pad_D1.5mm | TP6 |
| 1 | GREEN | LED_SMD:LED_0603_1608Metric | D5 |
| 1 | HIGH FLOAT | TerminalBlock_Phoenix:TerminalBlock_Phoenix_MKDS-1,5-3-5.08_1x03_P5.08mm_Horizontal | J11 |
| 1 | IRLML0040 | Package_TO_SOT_SMD:SOT-23 | Q1 |
| 1 | LEAK | Connector_Audio:Jack_3.5mm_KoreanHropartsElec_PJ-320D-4A_Horizontal | J6 |
| 1 | LVL_A | Connector_Audio:Jack_3.5mm_KoreanHropartsElec_PJ-320D-4A_Horizontal | J3 |
| 1 | LVL_B | Connector_Audio:Jack_3.5mm_KoreanHropartsElec_PJ-320D-4A_Horizontal | J4 |
| 1 | MMBT3904 | Package_TO_SOT_SMD:SOT-23 | Q70 |
| 1 | MOTOR | Connector_JST:JST_XH_B4B-XH-A_1x04_P2.50mm_Vertical | J15 |
| 1 | MS1 | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | JP2 |
| 1 | MS2 | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | JP3 |
| 1 | Olimex MH1 standoff | MountingHole:MountingHole_2.2mm_M2 | H5 |
| 1 | Olimex MH2 standoff | MountingHole:MountingHole_2.2mm_M2 | H6 |
| 1 | Olimex MH3 standoff | MountingHole:MountingHole_2.2mm_M2 | H7 |
| 1 | PC817 | Package_DIP:SMDIP-4_W9.53mm | U4 |
| 1 | PUMP | TerminalBlock_Phoenix:TerminalBlock_Phoenix_MKDS-1,5-2-5.08_1x02_P5.08mm_Horizontal | J12 |
| 1 | PUMP SUPPLY | Connector_BarrelJack:BarrelJack_CUI_PJ-102AH_Horizontal | J9 |
| 1 | PUMP SUPPLY | TerminalBlock_Phoenix:TerminalBlock_Phoenix_MKDS-1,5-2-5.08_1x02_P5.08mm_Horizontal | J10 |
| 1 | RAIL | TestPoint:TestPoint_Pad_D1.5mm | TP2 |
| 1 | RED | LED_SMD:LED_0603_1608Metric | D3 |
| 1 | RO_LOW | Connector_Audio:Jack_3.5mm_KoreanHropartsElec_PJ-320D-4A_Horizontal | J5 |
| 1 | RST-SLP | Jumper:SolderJumper-2_P1.3mm_Open_RoundedPad1.0x1.5mm | JP4 |
| 1 | SENS_V | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | JP1 |
| 1 | SENS_V | TestPoint:TestPoint_Pad_D1.5mm | TP7 |
| 1 | SMAJ24CA | Diode_SMD:D_SMA | D2 |
| 1 | SPARE_IN1 | Connector_Audio:Jack_3.5mm_KoreanHropartsElec_PJ-320D-4A_Horizontal | J7 |
| 1 | SPARE_IN2 | Connector_Audio:Jack_3.5mm_KoreanHropartsElec_PJ-320D-4A_Horizontal | J8 |
| 1 | STEPSTICK L | Connector_PinSocket_2.54mm:PinSocket_1x08_P2.54mm_Vertical | J13 |
| 1 | STEPSTICK R | Connector_PinSocket_2.54mm:PinSocket_1x08_P2.54mm_Vertical | J14 |
| 1 | YELLOW | LED_SMD:LED_0603_1608Metric | D7 |
Questions
How big is the Calyx level carrier PCB?
It measures 187 × 76 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Calyx level carrier use?
106 parts, built around the PESD5V0S1BL, 1N4148W, SS34 and IRLML0040. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the Calyx level carrier KiCad files?
From the ballhog/calyx-level repository on GitHub, at the commit this page was made from: the board is hardware/calyx-level-carrier/calyx-level-carrier.kicad_pcb and its schematic hardware/calyx-level-carrier/calyx-level-carrier.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Calyx level carrier design in my own project?
Its repository states no licence, so its author keeps all rights: ask ballhog before reusing the design.
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