STM32WLE5JC Design Modification

flux

You want the STM32WLE5JC (LoRa‑E5) to be the only MCU, with SWD via Tag‑Connect, I2C/UART/one‑wire breakouts, solar+LiFePO4 power, and a 5 V output on a rectangular blue PCB.
Plan summary:
  1. Remove unused parts: U6, J1, J3, J6, 12.5 V boost rail (IC1, L1, D4, related passives), RS‑485 (IC2, related), and mounting holes H1/H2.
  2. Make U4 sole MCU; add Tag‑Connect TC2030 SWD pads (SWDIO, SWCLK, NRST, 3V3, GND; SWO optional); keep RF and J2.
  3. Power: add Solar+/Solar− pads; replace U2 with a LiFePO4 charger for 5 V input and 14430 cell; add Batt+/Batt− pads; ensure 3.3 V rail for STM32; add a 5 V boost converter and 5V_OUT pads.
  4. IO breakouts: add solder pads for I2C (SCL/SDA with pull‑ups), UART (TX/RX), and two GPIO for one‑wire (optional pull‑ups), plus nearby 3V3 and GND pads.
  5. PCB/layout: remove headers/holes; place new pads; connect nets; set rectangular outline and blue mask note; run ERC/DRC and availability checks.
This plan is ready to execute. Click Start to begin.
Before I proceed, two quick details to finalize:
  • 5 V rail: what maximum continuous and peak current should we design for?
  • One‑wire sensors: power at 3.3 V or 5 V? Do you want onboard 4.7 kΩ pull‑ups to that rail, or leave footprints unpopulated?
  • Breakout style: edge castellated pads or interior rectangular solder pads (no headers)? Any preferred pad pitch/size?
maj-6

maj-6

Peak current on 5V rail will be 40mA. Continuous 30mA. One-wire sensors will need both 3.3v and 5v. Pads should be 2.54mm castellated.

flux

Your goal: single‑MCU STM32WLE5JC board with SWD, castellated IO, 5 V boost (30 mA cont/40 mA pk), and 5 V/60 mA solar + 14430 LiFePO4 power, on a rectangular blue PCB.
Plan:
  1. Remove legacy circuits and holes; keep LoRa‑E5 RF path.
  2. Redesign power: LiFePO4 charger (5 V solar), 3.3 V rail, 5 V boost, add Solar/Batt/5V pads.
  3. Add 6‑pad SWD, verify reset/decoupling.
  4. Add 2.54 mm castellated I2C (4.7 k pull‑ups, ≤ 400 pF), UART, two one‑wire with 3V3/5V/GND.
  5. Rectangular outline, blue mask; route and review.
Click Start to execute, or let me know if you want tweaks.
Pick 5V boost IC
Select LiFePO4 charger
Castellated pad guidance
One-wire pullup choice
Define breakout pin map
What is this switch for?
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what is the component supplier
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please explain what U4 does.
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design a simple robotic structure
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please explain what IC1 does.
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list all U3 pins in a table format. For each pin provide its pin number, pin nam...
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A XIAO RP2040 tudja kezelni a 2 uart kapcsolatot?
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recommend a replacement for U4.
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what will be the ripple current in this capacitor?
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please explain what +3V3 does.
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how do I use Flux?
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D4 purpose?
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please explain what C6 does.
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explain this project.
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explain this project.
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using the configuration of this project, what is the charging current?
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please explain what R10 does.
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are there any issues in this project?
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recommend a replacement for U3.
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list all ICs and the decoupling capacitors attached to each. Ensure to include a...
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arduino
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explain this project.
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can you provide the BOM with description, maximum voltage that the component get...
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please explain what R9, R6, R1, IC1, L1, D4, R4, VBAT, C10, SW1, 12\_5V, C7 do.
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how do I use Flux?
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create a high level mermaid block diagram of this project. Include key component...
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please add LED with degree of view 30 degree with magenta color with 0402 footpr...
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what is this design?
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are there any issues in this project?
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how to add lora communication?
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please explain what U2 does.
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Explain what each of the components here are, and what and where the connection...
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please explain what D3 does.
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explain this project.
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scanner radio ?
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why do you place here a resistor?
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Hello, This is wrong. It is not like that from its datasheet
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explain this project.
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what kind of soldered patch antenna for lora would you advise instead of the ipe...
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create a high level mermaid block diagram of U6. Include key component's manufac...
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explain this project.
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explain this project.
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recommend a replacement for R5.
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please explain what U4 does.
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Tengo una bateria y su cargador, como puedo hacer un circuito para que la baterí...
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list all ICs and the decoupling capacitors attached to each. Ensure to include a...
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create a detailed step by step plan table for this project to verify its functio...
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explain this project.
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recommend a replacement for L2.
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explain this project.
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120ohm是如何計算出來的呢？
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list all U2 pins in a table format. For each pin provide its pin number, pin nam...
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please explain what D5 does.
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recommend a replacement for U6.
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recommend a replacement for U1.
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add a adc circuit 5v
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hi
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please explain what U4 does.
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C11
Capacitance
4u7 F
U6
C2
Capacitance
10uF
C8
Not Recommended for New Designs
Capacitance
68pF
C10
Capacitance
22uF
C6
Capacitance
100nF
C5
Capacitance
10uF
R9
Resistance
20kΩ
R11
Resistance
22 Ω
R8
Resistance
2kΩ
R7
Resistance
15kΩ
R6
Resistance
150kΩ
R1
Resistance
3kΩ
R10
Resistance
22 Ω
R4
Resistance
4k7 Ω
R13
Resistance
470 Ω
R3
Resistance
68kΩ
R5
Resistance
6k8 Ω
R18
Resistance
22 Ω
SW2
U4
D4
D5
Color
Red
D2
Color
Green
L2
Inductance
2u2 H
SW1
J2
U3
U2
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The Green Dot 2040E5 Board

The Green Dot 2040E5 Board thumbnail
The "Green Dot 2040E5" Board is a Node that interfaces RS485 Sensor probes and can log information to the cloud using LoRa Connectivity. It uses the XIAO RP2040 and the LoRa-E5 (STM32WLE5JC) modules from Seeed Studio to do its magic. It also has amazing power management capabilities (Solar charging, Battery protection, etc) that make it very useful for IoT applications #internetOfThings #smartHomeDevices #SeeedStudio #XIAO #LoRa #RP2040 #IoT

Properties

Properties describe core aspects of the project.

Pricing & Availability

Distributor

Qty 1

Arrow

$13.68–$36.95

Digi-Key

$13.01–$15.08

LCSC

$35.58–$36.70

Mouser

$16.26–$16.77

Verical

$5.02–$6.41

Controls