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At up to 96% efficiency, it handles demanding applications including lithium battery charging, high-power LED driving, and portable lab power supply use.\u003c\/p\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eIC:\u003c\/strong\u003e XL4015\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInput Voltage:\u003c\/strong\u003e 5V – 32V DC\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOutput Voltage:\u003c\/strong\u003e 1.2V – 32V (adjustable, must be \u0026lt; input)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOutput Current:\u003c\/strong\u003e 0–5A (adjustable via potentiometer)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eEfficiency:\u003c\/strong\u003e Up to 96%\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDisplay:\u003c\/strong\u003e Integrated dual voltmeter + ammeter (real-time output V and A)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eControl Mode:\u003c\/strong\u003e CC (constant current) + CV (constant voltage)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCV\/CC Indicator:\u003c\/strong\u003e LED shows active mode\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAdjustment:\u003c\/strong\u003e Two potentiometers — voltage and current independently\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eAdvantage of Integrated Display\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eMonitor output voltage and current in real time without external multimeter\u003c\/li\u003e\n  \u003cli\u003eSet precise charging voltage and current for Li-ion battery packs\u003c\/li\u003e\n  \u003cli\u003eVerify LED driver current without additional instruments\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTypical Applications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eLi-ion \/ LiPo battery charger with current monitoring\u003c\/li\u003e\n  \u003cli\u003eHigh-power LED driver (constant current)\u003c\/li\u003e\n  \u003cli\u003ePortable adjustable lab power supply\u003c\/li\u003e\n  \u003cli\u003eSolar panel MPPT-like charge controller\u003c\/li\u003e\n  \u003cli\u003eMotor current-limited power supply\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eXL4015 5A CC\/CV step-down module with voltmeter + ammeter — 96% efficiency, 5–32V for lithium battery charging, LED drivers, and portable lab power supply.\u003c\/p\u003e","brand":"Keszoox","offers":[{"title":"Default Title","offer_id":46991450079467,"sku":"\u003cnone\u003e","price":19.48,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0677\/1005\/8731\/files\/xl4015-5a-adjustable-dc-dc-step-down-cc-cv-led-driver-voltmeter-ammeter.webp?v=1761801626"},{"product_id":"max7219-4-in-1-dot-matrix-display-module-with-5-pin-interface-for-arduino-microcontroller-projects","title":"MAX7219 4-in-1 Dot Matrix Display Module with 5-Pin Interface for Arduino Microcontroller Projects","description":"\u003ch2\u003eMAX7219 4-in-1 8x8 Dot Matrix LED Display Module - SPI, Arduino \/ ESP32\u003c\/h2\u003e\u003cp\u003eThis module chains \u003cstrong\u003efour 8x8 LED dot matrix panels\u003c\/strong\u003e driven by \u003cstrong\u003eMAX7219\u003c\/strong\u003e display driver ICs, providing a \u003cstrong\u003e32x8 pixel scrolling display\u003c\/strong\u003e via a simple \u003cstrong\u003e5-pin SPI interface\u003c\/strong\u003e. Multiple modules can be daisy-chained for wider displays. Ideal for scrolling text, animations, and visual indicators in Arduino and ESP32 projects.\u003c\/p\u003e\u003ch3\u003eKey Specifications\u003c\/h3\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eParameter\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDriver IC\u003c\/td\u003e\n\u003ctd\u003e4x MAX7219 (Maxim)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDisplay\u003c\/td\u003e\n\u003ctd\u003e4x 8x8 LED dot matrix (32x8 pixels total)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInterface\u003c\/td\u003e\n\u003ctd\u003eSPI (DIN, CLK, CS - 3 wires + VCC + GND)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSupply Voltage\u003c\/td\u003e\n\u003ctd\u003e5V DC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLED Color\u003c\/td\u003e\n\u003ctd\u003eRed (standard)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrightness Control\u003c\/td\u003e\n\u003ctd\u003e16-level software brightness\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCascadable\u003c\/td\u003e\n\u003ctd\u003eYes - chain via DOUT to DIN of next module\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModule Size\u003c\/td\u003e\n\u003ctd\u003e~128 x 32mm (4 panels)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch3\u003eWhy Choose MAX7219 Dot Matrix?\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e3-Wire SPI Control\u003c\/strong\u003e - DIN, CLK, CS from Arduino controls all 256 LEDs\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCascadable\u003c\/strong\u003e - Chain multiple modules for wider displays (8, 12, 16+ panels)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e16-Level Brightness\u003c\/strong\u003e - Software-controlled brightness via MAX7219 intensity register\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMD_MAX72xx Library\u003c\/strong\u003e - Full-featured Arduino library with font, scrolling, and animation support\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLow Power Shutdown\u003c\/strong\u003e - MAX7219 shutdown mode reduces power to 150uA\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eTypical Applications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eScrolling text ticker (news, stock prices, messages)\u003c\/li\u003e\n\u003cli\u003eClock display with animated digits\u003c\/li\u003e\n\u003cli\u003eGame display (Snake, Tetris, Pong)\u003c\/li\u003e\n\u003cli\u003eTemperature and sensor data visual display\u003c\/li\u003e\n\u003cli\u003eLED animation and pixel art display\u003c\/li\u003e\n\u003cli\u003eSports scoreboard and countdown timer\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eArduino Library and Setup\u003c\/h3\u003e\u003cp\u003eInstall MD_MAX72xx and MD_Parola libraries by MajicDesigns. Connect DIN to pin 11, CLK to pin 13, CS to pin 10, VCC to 5V, GND to GND. Select FC16_HW hardware type for most Chinese 4-in-1 modules.\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eQ: How many modules can I chain together?\u003c\/strong\u003e Theoretically unlimited - connect DOUT of one module to DIN of the next, share CLK and CS. Each module draws ~200mA at full brightness, so plan power supply accordingly.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ: What hardware type in MD_MAX72xx library?\u003c\/strong\u003e Select FC16_HW for most Chinese 4-in-1 modules. If display shows incorrect orientation, try GENERIC_HW or DR0CR0RR0_HW.\u003c\/p\u003e\u003ch3\u003ePackage Contents\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e1x MAX7219 4-in-1 8x8 Dot Matrix LED Display Module\u003c\/li\u003e\n\u003cli\u003e1x 5-pin connecting cable\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Keszoox","offers":[{"title":"MAX7219 4 in 1 green","offer_id":46991506669803,"sku":"14:4044226#MAX7219 4 in 1 green","price":26.72,"currency_code":"USD","in_stock":true},{"title":"MAX7219 4 in 1 Red","offer_id":46991506702571,"sku":"14:201659813#MAX7219 4 in 1 Red","price":19.8,"currency_code":"USD","in_stock":true},{"title":"MAX7219 blue","offer_id":46991506735339,"sku":"14:10#MAX7219 blue","price":9.6,"currency_code":"USD","in_stock":true},{"title":"MAX7219 Green","offer_id":46991506768107,"sku":"14:29#MAX7219 Green","price":9.44,"currency_code":"USD","in_stock":true},{"title":"MAX7219 Green Board","offer_id":46991506800875,"sku":"14:1202#MAX7219 Green Board","price":10.64,"currency_code":"USD","in_stock":true},{"title":"MAX7219 blue Board","offer_id":46991506833643,"sku":"14:350852#MAX7219 blue Board","price":10.64,"currency_code":"USD","in_stock":true},{"title":"MAX7219 4 in 1 blue","offer_id":46991506866411,"sku":"14:351074#MAX7219 4 in 1 blue","price":26.72,"currency_code":"USD","in_stock":true},{"title":"MAX7219 Red","offer_id":46991506899179,"sku":"14:94#MAX7219 Red","price":9.12,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0677\/1005\/8731\/files\/max7219-4-in-1-dot-matrix-display-module-5pin-arduino.webp?v=1761529809"},{"product_id":"10-segment-multicolor-led-bar-graph-display-arduino","title":"10-Segment Multicolor LED Bar Graph Display Module — Red\/Yellow\/Green\/Blue, Arduino","description":"\u003ch2\u003e10-Segment Multicolor LED Bar Graph Display Module — Red \/ Yellow \/ Green \/ Blue\u003c\/h2\u003e\u003cp\u003eThis \u003cstrong\u003e10-segment LED bar graph display\u003c\/strong\u003e provides a compact, high-visibility visual indicator with \u003cstrong\u003e10 individual LEDs\u003c\/strong\u003e in a single inline package. Available in multicolor configurations (Red\/Yellow\/Green\/Blue), it is the standard component for \u003cstrong\u003eVU meters, battery level indicators, signal strength displays\u003c\/strong\u003e, and any application requiring a segmented bar-style visual output with Arduino or any microcontroller.\u003c\/p\u003e\u003ch3\u003eKey Specifications\u003c\/h3\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eParameter\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNumber of Segments\u003c\/td\u003e\n\u003ctd\u003e10 (individually addressable)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLED Colors\u003c\/td\u003e\n\u003ctd\u003eRed, Yellow, Green, Blue (multicolor mix)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eForward Voltage (VF)\u003c\/td\u003e\n\u003ctd\u003e~2.0V (Red\/Yellow) \/ ~3.0V (Green\/Blue)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax Forward Current (IF)\u003c\/td\u003e\n\u003ctd\u003e20mA per segment\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePin Pitch\u003c\/td\u003e\n\u003ctd\u003e2.54mm (standard through-hole)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePackage\u003c\/td\u003e\n\u003ctd\u003eSIP-20 (10 anode + 10 cathode pins)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eViewing Angle\u003c\/td\u003e\n\u003ctd\u003e~120°\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temperature\u003c\/td\u003e\n\u003ctd\u003e-40°C to +85°C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch3\u003ePin Configuration\u003c\/h3\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003ePins\u003c\/th\u003e\n\u003cth\u003eFunction\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePins 1–10 (one side)\u003c\/td\u003e\n\u003ctd\u003eAnode (+) for segments 1–10\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePins 11–20 (other side)\u003c\/td\u003e\n\u003ctd\u003eCathode (−) for segments 1–10\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch3\u003eCurrent Limiting Resistors\u003c\/h3\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eColor\u003c\/th\u003e\n\u003cth\u003eVF\u003c\/th\u003e\n\u003cth\u003eResistor @ 5V, 10mA\u003c\/th\u003e\n\u003cth\u003eResistor @ 3.3V, 10mA\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRed \/ Yellow\u003c\/td\u003e\n\u003ctd\u003e2.0V\u003c\/td\u003e\n\u003ctd\u003e300Ω (use 330Ω)\u003c\/td\u003e\n\u003ctd\u003e130Ω (use 150Ω)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGreen \/ Blue\u003c\/td\u003e\n\u003ctd\u003e3.0V\u003c\/td\u003e\n\u003ctd\u003e200Ω (use 220Ω)\u003c\/td\u003e\n\u003ctd\u003e30Ω (use 33Ω)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch3\u003eWhy Choose This LED Bar Display?\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e10 Independent Segments\u003c\/strong\u003e — Each LED individually controlled for precise level indication\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMulticolor\u003c\/strong\u003e — Red\/Yellow\/Green\/Blue color zones provide intuitive visual feedback (e.g., green=safe, red=danger)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2.54mm Pitch\u003c\/strong\u003e — Breadboard and PCB compatible; standard through-hole footprint\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh Brightness\u003c\/strong\u003e — Visible in ambient light for panel-mount indicator applications\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eArduino Compatible\u003c\/strong\u003e — Drive directly from GPIO with current-limiting resistors\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eTypical Applications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eAudio VU meter (volume unit level display)\u003c\/li\u003e\n\u003cli\u003eBattery charge level indicator (0–10 segments = 0–100%)\u003c\/li\u003e\n\u003cli\u003eWiFi\/signal strength bar display\u003c\/li\u003e\n\u003cli\u003eTemperature or sensor value bar graph\u003c\/li\u003e\n\u003cli\u003eProgress indicator for loading or process completion\u003c\/li\u003e\n\u003cli\u003eLM3914\/LM3915 dot\/bar display driver output\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eArduino Example (LM3914 Driver)\u003c\/h3\u003e\u003cp\u003eFor automatic analog-to-bar conversion, use \u003cstrong\u003eLM3914\u003c\/strong\u003e (linear) or \u003cstrong\u003eLM3915\u003c\/strong\u003e (logarithmic\/dB) driver IC. Connect analog input to LM3914 IN pin; outputs Q1–Q10 drive LED bar segments directly. No MCU code required for basic VU meter.\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eQ: Can I drive this LED bar directly from Arduino GPIO?\u003c\/strong\u003e\u003cbr\u003eA: Yes — connect each anode to an Arduino GPIO pin via a 330Ω resistor (for red\/yellow) or 220Ω (for green\/blue). Connect all cathodes to GND. Use \u003ccode\u003edigitalWrite(pin, HIGH)\u003c\/code\u003e to light each segment.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ: How do I make a VU meter with this bar display?\u003c\/strong\u003e\u003cbr\u003eA: Use LM3914 (linear scale) or LM3915 (logarithmic, better for audio dB). Connect audio signal to IN pin, adjust RHI\/RLO for full-scale range. 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