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U1
MK1
please explain what R13, L2, C24, C16, R14, R8, C17, C23, VBAT, VOLTAGE REGULATO...
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J2
C28
Capacitance
100nF
C14
Capacitance
27pF
C1
Capacitance
100nF
C20
Capacitance
10uF
C12
Capacitance
100nF
C3
Capacitance
100nF
C8
Capacitance
1uF
C13
Capacitance
27pF
C10
Capacitance
100nF
C25
Capacitance
100nF
C24
Capacitance
10uF
C16
Capacitance
4.7uF
C6
Capacitance
100nF
C9
Capacitance
100nF
C4
Capacitance
100nF
C17
Capacitance
10uF
C23
Capacitance
100nF
C19
Capacitance
68pF
C2
Capacitance
100nF
C27
Capacitance
100pF
C5
Capacitance
100nF
C7
Capacitance
100nF
C18
Capacitance
100nF
C26
Capacitance
100nF
C11
Capacitance
1uF
D1
R2
Resistance
27.4 Ω
R13
Resistance
68kΩ
R15
Resistance
10kΩ
R10
Resistance
470 Ω
R9
Resistance
10kΩ
R4
Resistance
1kΩ
R19
Resistance
1k5 Ω
R18
Resistance
1kΩ
R16
Resistance
50 Ω
R11
Resistance
1k5 Ω
R14
Resistance
6.8kΩ
R8
Resistance
15kΩ
R7
Resistance
2kΩ
R12
Resistance
50 Ω
R17
Resistance
50 Ω
R5
Resistance
5kΩ
R3
Resistance
10kΩ
R6
Resistance
10kΩ
R1
Resistance
27.4 Ω
EXTERNAL FLASH CIRCUIT
CRYSTAL OSCILLATOR
Can connect a DHT11 or DHT22 Sensor
One-Wire protocol relies on the bus being pulled high by the pull-up resistor when not actively transmitting
Cl = 2(Ccap_load - Cstray)
SOLAR POWER INTERFACE
BATTERY CONNECTION
SOLAR PANEL CONNECTION
LoRa MODULE
Line 1
Enables long-range wireless LoRaWAN communication.
TEMP & HUMIDITY CIRCUIT
Pull up resistors
Line 1
R6 and r9 are are pull ups for the SD Card line
Line 2
Line 2
MAIN CONTROLLER
Q1 Disconnects SOLAR input when both SOLAR and USB are connected. NOTE: This is a depletion type mosfet
VOLTAGE REGULATOR
RF filter capacitors, C27, should be the closest to the microphone
MOUNTING HOLES
I_ch = (Vset / Rset) * 900 = 900mA
MICROPHONE CIRCUIT
SD CARD CIRCUIT
USB INTERFACE
U3
U4
U6
QSPI_SD0
J5
SD_CLK
SD_DATA1
LORA_RX
SD_CLK
MIC_WS
QSPI_SD3
LORA_NRST
QSPI_SCLK
QSPI_SS
SD_DATA3
USB_D-
XOUT
LORA_NRST
SD_DATA0
SD_CMD
SD_DATA2
XIN
~USB_BOOT
QSPI_SS
SD_CMD
QSPI_SD0
MIC_SDA
XIN
DHT_DATA
USB_D+
SD_DATA2
LORA_TX
SD_DATA1
QSPI_SD2
SD_DATA0
XOUT
SD_DATA3
LORA_RX
QSPI_SD1
QSPI_SD1
MIC_WS
J1
USB_D-
DHT_DATA
MIC_SCL
U2
MIC_SDA
QSPI_SD2
QSPI_SCLK
QSPI_SD3
MIC_SCL
LORA_TX
USB_D+
+3V3
VUSB
+1V1
+3V3
Decoupling Capacitors
Line 1
Ensure these capacitors are placed as close as possible to the MCU power rail
VBAT
VUSB
+3V3
+3V3
+1V1
J3
VSOLAR
VSOLAR
DECOUPLING CAPACITORS 1.1V
Line 1
Ensure these capacitors are placed as close as possible to the MCU power rail
+3V3
+3V3
VBAT
+1V1
+3V3
VBAT
+3V3
+3V3
+3V3
+3V3
+3V3
SW1
J6
LED1
Color
Green
Q1
U5
D4
Color
Red
SW2
D5
Color
Green
L2
Inductance
2.2uH
C29
Capacitance
100nF
C15
Capacitance
10uF
J4
Y1
C21
Capacitance
100nF
C22
Capacitance
4u7 F
Name

AvocAudio 04_03 Generating PCB Documentation