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Module1
Module2
Looks like ESP-NOW is a good way to get battery data from one device to another
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Reference Design Pg.1 https://storage.googleapis.com/flux-comment-files/files/...
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Use this website to generate battery levels on the LCD display. https://mischian...
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is LRCLK the same as WS for I2S?
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Will likely use these parts: LED LED Cone
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03/29/24 Test Results with 3V-3.7V forward Voltage LED: From a human perspectiv...
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size based on equation: (222\*VDD-100)
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Don't forget kelvin traces when routing https://storage.googleapis.com/flux-comm...
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Cold start of buck boost converter with 4V input 100mA current limit https://cd...
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what is R13 in the voltage divider with a ratio of 5V/3.3V assuming R14 is 10kO...
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Could build our own CC buck converter with the ESP32-C3. Max PWM is 40MHz with 1...
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This part has up to a 18% error at 2.5A on VSENSE. Worst case scenario, the buck...
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roast my design
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No load, 4V input, buck operation Yellow is input, Purple is output @copilot ex...
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https://files.seeedstudio.com/wiki/XIAO\_WiFi/pin\_map-2.png
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what is VFB for IC1?
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In the image below, the purple signal is the 3.3V output of the buck boost conve...
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V1 Mistake: Forgot to put pullup resistor on PG of this buck boost converter.
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I want f to be greater than 400kHz. D = 0.02, Vout = 3.3V, Iout=2.5A. What value...
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please provide me with c macros of the format #define MACRO\_NAME VALUE where th...
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GAIN\_SLOT unconnected = 9dB gain. Refer to page 5 of datasheet https://storage...
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Buck converter CC reference design
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IC1 is a buck boost converter that uses a current sense amplifier to set a curre...
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what is the minimum common mode operating voltage to power the analog circuitry ...
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Buck 4V input no load https://cdn2.flux.ai/flux-comment-files/files/commentFile...
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can play mp3s on SPIFFs using this library But maybe should also include SD Car...
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With only 50mW through the sense resistor, consider an alternative that is sligh...
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Can you calculate Ipeak? Iout is about 2.5A, D is about 0.02 and VIN is 2.8V. Th...
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R1MON @ 2.5A = 2.5\*0.008 = 0.02V U2M\_IOUT @ 2.5A = 0.004\*0.02 = 0.00008 A V...
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Ref Design: img
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design me a voltage divider for a battery monitor. My LiIon cell goes up to 4.2V...
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PG is open drain and needs a pullup resistor on the 3.3V net for the ESP32-C3
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C1
Capacitance
0.1uF
C4
Capacitance
0.1uF
C9
Capacitance
0.1uF
C12
Capacitance
10uF
C2C
Capacitance
22uF
Voltage
10 V
C1A
Capacitance
10uF
Voltage
10 V
C1B
Capacitance
10uF
Voltage
10 V
C2A
Capacitance
22uF
Voltage
10 V
C2
Capacitance
10uF
C2D
Capacitance
22uF
Voltage
10 V
C11
Capacitance
22uF
Voltage
10 V
C2B
Capacitance
22uF
Voltage
10 V
C14
Capacitance
0.1uF
C10
Capacitance
10uF
C3
Capacitance
10uF
IC2
I2S_DIN
+3.3V_BUCK_BOOST_PG
LED_CC_2.5A_PG
VBATT_MON_10/43
I2S_BCLK
VINA
I2C_SDA
I2S_BCLK
SPK_N
LED_CC_2.5A_EN
I2S_BCLK
+3.3V_BUCK_BOOST_PG
SPK_N
VINA
I2C_SCL
+3.3V_BUCK_BOOST_PG
VBATT_MON_10/43
IC1_FB
LED_CC_2.5A_EN
I2S_LRCLK
LED_CC_2.5A_PG
I2S_DIN
I2S_LRCLK
I2S_LRCLK
5V_MON_50/33
SPK_N
5V_MON_50/33
I2C_SDA
I2C_SCL
SW_DIGITAL
I2S_DIN
SPK_P
VBATT_MON_10/43
SPK_P
SW_DIGITAL
IC1_FB
I2C_SCL
5V_MON_50/33
SPK_P
I2C_SDA
+3.3V
+3.3V
LED_CC_2.5A
VBATT_5V_SW
R15
Resistance
10kΩ
+3.3V
R7
Resistance
4.7kΩ
+5V
R13
Resistance
5.6kΩ
GND
R1IMON
Resistance
8mΩ
Power
1 W
VBATT
+3.3V
VBATT_5V_SW
VBATT_5V_SW
R16
Resistance
100kΩ
+3V3
R9
Resistance
1.2kΩ
+3.3V
R6
Resistance
4.7kΩ
R2SET
Resistance
15.8kΩ
VBATT
R12
Resistance
10kΩ
+3.3V
VBATT_5V_SW
R14
Resistance
10kΩ
VBATT_5V_SW
R10
Resistance
1.2kΩ
VBATT
+5V
R8
Resistance
1.2kΩ
R4
Resistance
10kΩ
VBATT_5V_SW
VBATT_5V_SW
+3.3V
R3
Resistance
10kΩ
+3.3V
LED_CC_2.5A
LED_CC_2.5A
R5
Resistance
634kΩ
+3.3V
+5V
R11
Resistance
33kΩ
VBATT
CHG
Mounting Holes
Line 1
M2.5
Line 3
Line 3
Microcontroller
Line 1
XIAO ESP32-C3
J2
U2M
H4
STDBY
Constant Current Source
Line 1
Buck Converter with Current Amplifier in Feedback Path
J1
H3
Display Breakout
Line 1
SSD1306 I2C Display
Input Power Stage
Line 1
Battery and Load Switch
Line 2
3.3V Buck Boost
Line 3
Line 3
H1
Audio Stage
Line 1
I2S Class D Amp and Cheap Speaker
H2
Battery Stage
Line 1
1S Li-Ion Charger
Line 2
Resistor Divider for Voltage Measurement
Line 3
Line 3
Test Interface
Line 1
Increase Layer count to 4 Layer and route these signals on internal layers
U4
U3
SPK1
OLED1
L1
Inductance
1uH
ISAT
7 A
IC1
BT1

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Documents

    Documents are markdown text files which describe project goals, capture details, or even simulation outputs.

    Assets

    svg

    Mark Wu.svg

    Mark WuDefault
    svg

    FluxLogoTransparent.svg

    FluxLogoTransparent
    FlashlightIcon.png

    FlashlightIcon.png

    FlashlightIconThumbnail

    Lethal Company Pro Flashlight Power Board V1

    Lethal Company Pro Flashlight Power Board V1 thumbnail
    Lethal Company Pro Flashlight
    Broken Features:
    • U2M cannot be line powered from this circuit so the LED driver does not regulate.
    Find the acompanying button board here
    -Ultra bright -Makes click noise from speaker -Wirelessly transmits battery life (maybe use Ubo to receive this) -Drive a SST-40 Chinese LED
    I want this thing to be super bright! The brighter the better, but keep it simple.
    These LEDs will draw a lot of power, so we need some sort of CC source. It doesn't have to have high bandwidth.
    I am thinking about a DIY microcontroller buck converter with PID duty cycle control.
    Mistakes in this V1 design:
    • No pullup resistor on PG of Module1

    Properties

    creativecommons.org/licenses/by/4.0/

    github.com/markwu2001/lethal-company-flashlight

    Pricing & Availability

    Distributor

    Qty 1

    Digi-Key

    $9.13–$12.61

    LCSC

    $5.31–$5.36

    Mouser

    $13.90

    Controls