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Schematic

Layout

3D View

+3V3
VBAT
+3V3
+3V3
+1V1
+3V3
+1V1
+1V1
+3V3
+3V3
+3V3
+3V3
+3V3
C2
Capacitance
100nF
C4
Capacitance
100nF
C14
Capacitance
27pF
C20
Capacitance
10uF
C12
Capacitance
100nF
C13
Capacitance
27pF
C1
Capacitance
100nF
C10
Capacitance
100nF
C26
Capacitance
100nF
C9
Capacitance
100nF
C5
Capacitance
100nF
C6
Capacitance
100nF
C25
Capacitance
100nF
C11
Capacitance
1uF
C8
Capacitance
1uF
C3
Capacitance
100nF
C7
Capacitance
100nF
EXTERNAL FLASH CIRCUIT
User LED for blinking and testing the board
R19
Resistance
1k5 Ω
Cl = 2(Ccap_load - Cstray)
R9
Resistance
10kΩ
SOLAR POWER INTERFACE
R14
Resistance
6k8 Ω
R8
Resistance
15kΩ
R13
Resistance
68kΩ
LoRa MODULE
R4
Resistance
1kΩ
R2
Resistance
27.4 Ω
POWER CIRCUIT
Pull up resistors
Line 1
R6 and r9 are are pull ups for the SD Card line
Line 2
Line 2
Termination resistors
R18
Resistance
1kΩ
C8 Should be close to pin 44 of RP2040
MICROCONTROLLER
R16
Resistance
50 Ω
C11 Should be close to pin 45 of RP2040
Iset = 6800 / Rset = 1A
R17
Resistance
50 Ω
R7
Resistance
2kΩ
R1
Resistance
27.4 Ω
I_ch = (Vset / Rset) * 900 = 900mA
R3
Resistance
10kΩ
R6
Resistance
10kΩ
SD CARD CIRCUIT
C17
Capacitance
10uF
MIC_SCL
QSPI_SD0
D2
Color
Green
QSPI_SS
SD_DATA1
LORA_RX
LORA_NRST
SD_CLK
QSPI_SD2
SD_CMD
QSPI_SD1
SD_DATA3
XOUT
LORA_RX
LORA_NRST
C24
Capacitance
10uF
SD_DATA0
~USB_BOOT
QSPI_SS
SD_CMD
MIC_SDA
QSPI_SD3
SD_CLK
LORA_TX
SD_DATA2
C19
Capacitance
68pF
SD_DATA2
DHT_DATA
LORA_TX
SD_DATA1
QSPI_SCLK
USB_D-
QSPI_SD1
C22
Capacitance
4u7 F
XOUT
SD_DATA0
XIN
SD_DATA3
QSPI_SD2
QSPI_SCLK
QSPI_SD3
QSPI_SD0
USB_D+
MIC_WS
C23
Capacitance
100nF
SW1
SW2
U3
U5
U1
Y1
J1
U2
U6

Curved Traces Quick Demo