2 layers
4 layers188.5 × 82 mm
Digital waters
atop8918/DigitalWaters_WD_prototypeSimplified Schematic for prototype release
- Size
- 188.5 × 82 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 118
- Nets
- 90
- Pads
- 399
- Tracks, vias
- 883, 153
- Pours
- 9
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 8 Jun 2025
- Updated
- 22 Jul 2025
Overview
Digital waters is an open-source printed circuit board by atop8918, from the atop8918/DigitalWaters_WD_prototype repository on GitHub, published under the MIT licence. It is a 4-layer board of 188.5 × 82 mm with 118 parts on 90 nets, routed with 883 tracks and 153 vias.
It is built around the TLV4387PW, DHT20 and MCP3208-BI/P, with the ESDA5V3SC5, M24C02-FMN6P and TPS22929DDBV among its other parts. Its parts include 38 capacitors, 29 resistors, 16 connectors and 12 ICs. It belongs with the ESP32 boards of this library.
Main components
6
TLV4387PW
TSSOP-14-2.75V~-850mV、850mV~2.75V -40℃~+125℃ 1.7V~5.5V 10nV/℃ 130dB 15mA 2.8V/us 300pA 5.7MHz 570uA 5uV 700pA 8.5nV/√Hz@1kHz EMI filtering/RF suppression、Zero drift / auto-zero、Built-in compensation Four channels Rail-to-rail input TSSOP-14 Precision Op Amps ROHSTexas InstrumentsPrecision Op Amps
DHT20
SIP-4-40℃~+80℃ 0%RH~100%RH 2.2V~5.5V 980uA Factory calibration I2C ±0.5℃ ±3%RH SIP-4 Temperature and Humidity Sensor ROHSAosong ElecTemperature And Humidity Sensor
MCP3208-BI/P
PDIP-16-40℃~+85℃ 0.5LSB 100kHz 12 1LSB 1MHz、2MHz 2.7V~5.5V 500nA 8 External External Multiplexers、Bipolar input Not supported SAR SPI Yes PDIP-16 Analog to Digital Converters (ADC) ROHSMicrochip TechnologyAnalog To Digital Converters (ADC)
ESDA5V3SC5
SOT-23-5-55℃~+150℃ 21V 22A@8/20us 2uA 300W@8/20us 320pF 3V 5.9V ESD Four channels IEC 61000-4-2 Unidirectional SOT-23-5 ESD and Surge Protection (TVS/ESD) ROHSSTMicroelectronicsESD And Surge Protection (TVS/ESD)
M24C02-FMN6P
SOIC-8-40℃~+85℃ 1.7V~5.5V 200 Years 2Kbit 4,000,000 Cycles 400kHz 5ms Hardware write protection function、Noise suppression function、Built-in power-on reset (POR) I2C SOIC-8 EEPROM ROHSSTMicroelectronicsEEPROM
TPS22929DDBV
SOT-23-6-40℃~+85℃ 1 1.4V~5.5V 1.8A 115mΩ Active High Load Switch 输出放电功能、软启动、欠压锁定、反向电压保护、反向电流阻断 SOT-23-6 Power Distribution Switches ROHSTexas InstrumentsPower Distribution Switches
README
README.mdDigitalWaters_WD_prototype
Simplified Schematic for prototype release
Parts
118| Qty | Value | Footprint | References |
|---|---|---|---|
| 17 | MountingHole | MountingHole:MountingHole_2.7mm_M2.5_ISO14580 | H1, H2, H3, H4, H5, H6, H7, H8, H10, H11, H12, H13, H14, H15, H16, H17 +1 |
| 15 | 1u | Capacitor_SMD:C_1210_3225Metric_Pad1.33x2.70mm_HandSolder | C7, C8, C12, C18, C20, C26, C27, C28, C31, C33, C35, C48, C88, C91, C95 |
| 9 | 0.1u | Capacitor_SMD:C_1210_3225Metric_Pad1.33x2.70mm_HandSolder | C4, C6, C13, C32, C46, C58, C87, C92, C93 |
| 9 | 1k | Resistor_SMD:R_1210_3225Metric_Pad1.30x2.65mm_HandSolder | R1, R8, R19, R20, R24, R26, R50, R51, R52 |
| 7 | 10u | Capacitor_SMD:C_1210_3225Metric_Pad1.33x2.70mm_HandSolder | C16, C17, C19, C21, C22, C29, C34 |
| 7 | 800n | Capacitor_SMD:C_1210_3225Metric_Pad1.33x2.70mm_HandSolder | C1, C2, C3, C5, C23, C24, C25 |
| 5 | 10k | Resistor_SMD:R_1210_3225Metric_Pad1.30x2.65mm_HandSolder | R10, R38, R39, R42, R46 |
| 4 | 100k | Resistor_SMD:R_1210_3225Metric_Pad1.30x2.65mm_HandSolder | R3, R9, R11, R21 |
| 3 | OPA2397DGKR | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | U4, U5, U11 |
| 2 | 10 | Resistor_SMD:R_1210_3225Metric_Pad1.30x2.65mm_HandSolder | R7, R47 |
| 2 | 200 | Resistor_SMD:R_1210_3225Metric_Pad1.30x2.65mm_HandSolder | R48, R49 |
| 2 | ESDA5V3SC5 | Package_TO_SOT_SMD:SOT-23-5 | U3, U9 |
| 1 | +2.5V_REF | TestPoint:TestPoint_Pad_D3.0mm | TP2 |
| 1 | +4.096V_REF | TestPoint:TestPoint_Pad_D3.0mm | TP5 |
| 1 | 0 Ohm | Resistor_SMD:R_1210_3225Metric_Pad1.30x2.65mm_HandSolder | R4 |
| 1 | 114k | Resistor_SMD:R_1210_3225Metric_Pad1.30x2.65mm_HandSolder | R25 |
| 1 | 1k / 0.1% | Resistor_SMD:R_Array_Concave_4x0603 | RN1 |
| 1 | 3.3k | Resistor_SMD:R_1210_3225Metric_Pad1.30x2.65mm_HandSolder | R17 |
| 1 | 4.7k | Resistor_SMD:R_1210_3225Metric_Pad1.30x2.65mm_HandSolder | R22 |
| 1 | 470 | Resistor_SMD:R_1210_3225Metric_Pad1.30x2.65mm_HandSolder | R18 |
| 1 | 5k | Resistor_SMD:R_1210_3225Metric_Pad1.30x2.65mm_HandSolder | R12 |
| 1 | 990 | Resistor_SMD:R_1210_3225Metric_Pad1.30x2.65mm_HandSolder | R6 |
| 1 | Atlas Surveyor | Connector_PinSocket_2.54mm:PinSocket_1x03_P2.54mm_Vertical | J17 |
| 1 | Calibration_In | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical_SMD_Pin1Left | J14 |
| 1 | DHT20 | Connector_PinSocket_2.54mm:PinSocket_1x04_P2.54mm_Vertical_SMD_Pin1Left | U17 |
| 1 | ESP32 [L] | Connector_PinSocket_2.54mm:PinSocket_1x20_P2.54mm_Vertical_SMD_Pin1Left | J16 |
| 1 | ESP32 [R] | Connector_PinSocket_2.54mm:PinSocket_1x20_P2.54mm_Vertical_SMD_Pin1Left | J11 |
| 1 | ESP_Only | Connector_PinHeader_2.54mm:PinHeader_2x03_P2.54mm_Vertical_SMD | J10 |
| 1 | EZO Carrier Board | Connector_PinSocket_2.54mm:PinSocket_1x05_P2.54mm_Vertical | J18 |
| 1 | I2C_EXPANSION | Connector_PinHeader_2.54mm:PinHeader_2x02_P2.54mm_Vertical_SMD | J13 |
| 1 | M24C02-FMN | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | U2 |
| 1 | MCP3208 | Package_SO:SOIC-16_3.9x9.9mm_P1.27mm | U1 |
| 1 | ORP_In | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical_SMD_Pin1Left | J3 |
| 1 | PT-100_TEMP_IN | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical_SMD_Pin1Left | J2 |
| 1 | REF3025 | Package_TO_SOT_SMD:SOT-23 | U8 |
| 1 | REF3040 | Package_TO_SOT_SMD:SOT-23 | U7 |
| 1 | RPi Zero 2 W | Connector_PinSocket_2.54mm:PinSocket_2x20_P2.54mm_Vertical_SMD | J24 |
| 1 | RPi_Batt | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical_SMD_Pin1Left | JP3 |
| 1 | RPi_Only | Connector_PinHeader_2.54mm:PinHeader_2x07_P2.54mm_Vertical_SMD | J9 |
| 1 | RPi_Temp | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical_SMD_Pin1Left | JP4 |
| 1 | SHARED | Connector_PinHeader_2.54mm:PinHeader_2x07_P2.54mm_Vertical_SMD | J8 |
| 1 | SPARE | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical_SMD_Pin1Left | J5 |
| 1 | SPI_EXPANSION | Connector_PinHeader_2.54mm:PinHeader_2x02_P2.54mm_Vertical_SMD | J12 |
| 1 | TLV4387 | Package_SO:TSSOP-14_4.4x5mm_P0.65mm | U13 |
| 1 | TPS22929D | Package_TO_SOT_SMD:SOT-23-6 | U6 |
| 1 | Turbidity TSW-10 | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical_SMD_Pin1Left | J4 |
| 1 | VSW | TestPoint:TestPoint_Pad_D3.0mm | TP3 |
| 1 | pH_IN | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical_SMD_Pin1Left | J1 |
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Questions
How big is the Digital waters PCB?
It measures 188.5 × 82 mm and has 4 copper layers, 1.6 mm thick.
What parts does the Digital waters use?
118 parts, built around the TLV4387PW, DHT20, MCP3208-BI/P and ESDA5V3SC5. 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 Digital waters KiCad files?
From the atop8918/DigitalWaters_WD_prototype repository on GitHub, at the commit this page was made from: the board is digital_waters.kicad_pcb and its schematic conductivity_4.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Digital waters design in my own project?
Its repository publishes it under the MIT licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).