Solar Water Heater Controller Design

flux

0:09

General (prev)
I connected all power, ground, and signal nets (including relay control, DS18B20, buffered ADCs, buttons, I²C, and SPI) to their respective component pins and Pico GPIOs as specified. Let me know if you’d like any adjustments.
70 days

Updated 11 nets

0:13

Connected U1:V+, IC2:VDD:P1, R4:P2, R1:P2, K1:12:P1

Connected U1:V-, IC2:VSS:P1, D1:Cathode, GND:GND

Connected Q3:G, R7:P2, D3:K

Connected K1:10 to Q3:D

Connected R1:P1, R4:P1, P2:P1

Connected U1:~ to GPIO26_ADC0:P1

Connected U1:OUTPUT to GPIO27_ADC1:P1

Connected J1:P2, R8:P1, GPIO2:P1

Connected J1:P3, R9:P1, GPIO3:P1

Connected IC2:SDA, IC2:SCL, J2:PIN_3, J2:PIN_4, GPIO4:P1, GPIO5:P1

Connected J3:P3, GPIO19:P1, J3:P7, GPIO16:P1, J3:P5, GPIO18:P1, J3:P2, GPIO20:P1, J3:P4, 3V3:P1, J3:P6, AGND:P1

70 days

Worked

0:19

Autopilot
70 days

flux

0:00

Autopilot
All tasks in the implementation plan have been completed:
• Board width set to 30 mm, with four mounting holes and keep-outs. • Power architecture locked to 3.3 V only; legacy 5 V/12 V nets removed; Pico 3V3 and AGND rails routed. • Valve driver (TXD2SS-3V-3 relay + 2N7002), DS18B20 bus with 4.7 kΩ pull-up, and flyback Zener/diode added and wired. • Two potentiometer terminals buffered by MCP6002 on ADC0/ADC1 referencing AGND. • BTN_L/BTN_R screw terminals, 3V3 OUT terminal, RTC (PCF8563T) with I²C display header, DMG2305UX Q2 charge/status FET, and rear MEM2085 Micro SD slot placed and connected. • All passives (decoupling capacitors, pull-ups, gate resistors, Zener) have correct values, ratings, and footprints. • Schematic nets (power, signals, I²C, SPI, sensor bus, ADC, buttons, relay control) fully routed. • PCB outline and 4-layer stackup configured; footprints verified; paused for board outline and mounting review.
Success criteria are met. The next step in the workflow is to proceed with component placement optimization and auto-routing in the PCB layout. Would you like me to start placing and routing components now?
70 days

Plan completed.

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R7 P2 - Q3 G
R7
Resistance
100Ω
R2
Resistance
10kΩ
R5
Resistance
10kΩ
R6
Resistance
10kΩ
U1 V+ - IC2 VDD
R10 P2 - Q2 G
R8
Resistance
10kΩ
U1 V+ - IC2 VDD
R1
Resistance
4.7kΩ
R10
Resistance
500 Ω
U1 V+ - IC2 VDD
Q3
R4
Resistance
4.7kΩ
K1 12 - R1 P2
R7 P2 - Q3 G
Q2 S - D2 A
Q3
R9
Resistance
10kΩ
U1 V+ - IC2 VDD
IC2 SCL - J2 PIN_3
R7 P2 - Q3 G
K1 12 - R1 P2
Q2
Q3 D - K1 10
U1 V- - IC2 VSS
Q3 D - K1 10
U1 V- - IC2 VSS
IC2
U1 V+ - IC2 VDD
U1 V+ - IC2 VDD
K1 12 - R1 P2
Q3
R3
Resistance
10kΩ
GPIO22
TP1
P2
GND
P1
GND
SWDIO
P11
P17
P14
GND
P3
GPIO12
P9
GPIO8
P12
GND
RUN
GPIO16
P13
GPIO19
TP6
GPIO9
GPIO17
GPIO15
GPIO10
TP2
P16
TP3
TP4
P15
P10
SWCLK
GND
GPIO13
GPIO20
TP5
GPIO11
GPIO18
GPIO14
GPIO21
K1
K1
K1
  • Ground
    Ground
    A common return path for electric current. Commonly known as ground.
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    Power Net Portal
    Wirelessly connects power nets on schematic. Identical to the net portal, but with a power symbol. Used to organize schematics and separate functional blocks. To wirelessly connect power net portals, give them the same designator. #portal #power
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    Generic Resistor
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    875105359001
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Inspect

Raspberry Pi Pico 2 W Shield SMD

Raspberry Pi Pico 2 W Shield SMD
Description

Created
Last updated by vasy_skral
1 Contributor(s)
vasy_skral

Controls

Properties

Connectivity
WiFi, Bluetooth
Part Type
Microcontroller
Connectivity
WiFi
Human Interface
Buttons, Display, Switches
Manufacturer Part Number
Raspberry Pi Pico 2 W
Designator Prefix
U
Symbol Style
Parametric
Human Interface
Switches
Domain
Agriculture
Human Interface
Buttons
Operating Voltage
3.3 V
System Architecture
```mermaid flowchart LR PWR["3.3V Only Power\nDMG2305UX Q2"] Pico["Raspberry Pi Pico 2 W"] RD["3.3V Relay Driver"] RC["3.3V Coil Relay"] DS["DS18B20 Sensor Bus"] PU["4.7kΩ Pull-ups"] BUF["MCP6002 Buffers\n(ADC0/ADC1 → AGND)"] AGND[["AGND"]] RT["RTC IC"] IH["I2C Display Header"] ST["Screw Terminals\n(3V3 OUT, BTN_L, BTN_R, Sensors, Valve)"] SD["Rear Micro SD Breakout Connector"] PWR -->|Powers| Pico PWR --> RD PWR --> DS PWR --> BUF PWR --> RT PWR --> ST PWR --> SD Pico --> RD RD --> RC Pico --> DS PU --> DS Pico --> BUF BUF --> AGND Pico --> RT RT --> IH Pico --> IH Pico --> ST Pico --> SD ```
Power Requirements
USB
PCB Layout Size Constraint: Board Width
30mm

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