--- product_id: 527594286 title: "Hosyond 3pcs IIC I2C 2004 LCD Module 20x04 LCD Screen Module Display for Arduino Raspberry Pi" brand: "hosyond" price: "NT$1167" currency: TWD in_stock: true reviews_count: 11 category: "Hosyond" url: https://www.desertcart.tw/products/527594286-hosyond-3pcs-iic-i2c-2004-lcd-module-20x04-lcd-screen store_origin: TW region: Taiwan --- # I2C serial interface, 4-wire hookup 4 lines x 20 chars display Blue backlit adjustable contrast Hosyond 3pcs IIC I2C 2004 LCD Module 20x04 LCD Screen Module Display for Arduino Raspberry Pi **Brand:** hosyond **Price:** NT$1167 **Availability:** ✅ In Stock ## Summary > 🔧 Elevate your maker game with sleek, smart, and simple LCD brilliance! ## Quick Answers - **What is this?** Hosyond 3pcs IIC I2C 2004 LCD Module 20x04 LCD Screen Module Display for Arduino Raspberry Pi by hosyond - **How much does it cost?** NT$1167 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.tw](https://www.desertcart.tw/products/527594286-hosyond-3pcs-iic-i2c-2004-lcd-module-20x04-lcd-screen) ## Best For - hosyond enthusiasts ## Why This Product - Trusted hosyond brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Plug & Play Compatibility:** Works effortlessly with Arduino, Raspberry Pi, STM32, and more—ideal for makers and pros alike. - • **Versatile IoT & DIY Ready:** Display real-time data like clocks, temps, or messages in smart buildings and electronics projects. - • **Streamlined I2C Connectivity:** Simplify wiring with just 4 wires (GND, VCC, SDA, SCL) for seamless Arduino & Raspberry Pi integration. - • **Customizable Backlight Control:** Adjust contrast via built-in potentiometer for optimal visibility in any lighting. - • **Crystal Clear 80-Character Display:** Showcase detailed info with 4 lines x 20 characters—perfect for complex projects. ## Overview This 3-pack of 20x4 blue LCD modules features an I2C interface for minimal wiring and broad compatibility with popular development boards like Arduino and Raspberry Pi. Each display offers adjustable contrast via a built-in potentiometer and supports real-time data visualization, making it a top choice for IoT, DIY electronics, and smart building projects. ## Description Specifications: Display: 4-lines x 20-characters Four Pin Definition: GND, VCC, SDA, SCL Default I2C bus address: 0 x 27 for F8574T chip Working voltage: 5V Adjust Backlight: Potentiometer Package includes: 3 x LCD module 1 x 10pin F-M jumper wires Review: These work well. Read the review for how to make them better. - These LCD screens are good. If you're familiar with the 4x16 which come with some of the Arduino kits, these are different in that they use I2C communication. This is a good thing as using I2C with the Arduino is easy and means these only need 4 wires to be connected: Vcc, GND, and two wires to enable the comms to the Arduino. Much easier than the ratsnest of wires to the 4x16 which come in some kits. Look up "hd44780.h library" and you will find it as a free download on GitHub. Of note, but certainly not worth dinging this any stars: at one time there was likely a jumper on two pins on the I2C backpack. (The little adapter card on the back which is the go-between for I2C to the LCD is called a "backpack"). The location for the two pins is still there but there are no pins and no jumper. If you check you will find that the two holes, soldered over, are connected. Looking closely, you will see a very fine trace between the two pin holes. If you scrape through that trace, electrically isolating those points, the LCD will not illuminate. Now check both pins to Vcc for continuity: you will find one solder pad/hole which is directly connected to Vcc. You don't want this pin/pad, you want the other one (make sure they are not connected any longer, be sure that you got the trace destroyed). Solder in a pin here or directly solder to it if you feel lucky and connect this to one of the PWM pins on the Arduino. You can now adjust the LCD backlighting brightness with the Arduino (you'll have to configure that Arduino pin and set its output appropriately). Without this modification the LCD is either on or off, which you can control with the Arduino. However, without this mod, you cannot adjust the brightness of the backlighting (the little trim pot on the back of the unit is for adjusting the contrast of the display). With this mod you can turn the backlight on and off like you could before, *AND* you can adjust the brightness of the backlight. At full power the backlight is *BRIGHT*. Turning it down indoors is...good. Review: Works as intended! - Works amazing, good notation! ## Features - 2004 LCD screen can display 4 lines x 20 characters, with i2c serial interface, blue display. - Compatible with most development boards, such as Arduino, Raspberry pi, Tinkerboard, Nano pi, Banana pi, stm32, etc. - Power supply: 5v; I2C address: 0x27; wiring method: GND—GND, VCC—VCC, SDA—A4, SCL—A5. - Built-in independent potentiometer, backlight can be adjusted through the back potentiometer. - Widely used in: Internet of Things, school electronics projects, smart buildings, maker DIY projects, etc., can display letters, characters, numbers, real-time clock or temperature. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B0C1G9GBRZ | | Best Sellers Rank | #7,729 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #1 in LCD Character Modules | | Brand | Hosyond | | Built-In Media | 1 x 10pin jumper wires, 3 x I2C 2004 LCD | | CPU Manufacturer | ARM | | CPU Model | ARMv7 | | Compatible Devices | Arduino, Raspberry Pi, Tinkerboard, Nano pi, Banana pi, stm32 | | Connectivity Technology | I2C | | Customer Reviews | 4.7 out of 5 stars 313 Reviews | | Included Components | 1 x 10pin jumper wires, 3 x I2C 2004 LCD | | Item Weight | 8 Ounces | | Manufacturer | Hosyond | | Mfr Part Number | B007 | | Operating System | Linux | | Processor Brand | ARM | | Processor Count | 1 | | UPC | 732214748156 | | Warranty Description | NO | ## Product Details - **Brand:** Hosyond - **CPU Model:** ARMv7 - **Connectivity Technology:** I2C - **Included Components:** 1 x 10pin jumper wires, 3 x I2C 2004 LCD - **Operating System:** Linux ## Images ![Hosyond 3pcs IIC I2C 2004 LCD Module 20x04 LCD Screen Module Display for Arduino Raspberry Pi - Image 1](https://m.media-amazon.com/images/I/71t3yGbVdLL.jpg) ![Hosyond 3pcs IIC I2C 2004 LCD Module 20x04 LCD Screen Module Display for Arduino Raspberry Pi - Image 2](https://m.media-amazon.com/images/I/71drxgxL6sL.jpg) ![Hosyond 3pcs IIC I2C 2004 LCD Module 20x04 LCD Screen Module Display for Arduino Raspberry Pi - Image 3](https://m.media-amazon.com/images/I/61mwz9XzrUL.jpg) ![Hosyond 3pcs IIC I2C 2004 LCD Module 20x04 LCD Screen Module Display for Arduino Raspberry Pi - Image 4](https://m.media-amazon.com/images/I/612kdmwy5kL.jpg) ![Hosyond 3pcs IIC I2C 2004 LCD Module 20x04 LCD Screen Module Display for Arduino Raspberry Pi - Image 5](https://m.media-amazon.com/images/I/618Ild00RyL.jpg) ## Available Options This product comes in different **Size** options. ## Questions & Answers **Q: How much current does this draw?** A: Backlight power consumption (typical) : 15mA Supply voltage (typical value) : 3.3V, 5V Module operating current (Max) : 1500uA (Vdd=5V),1250uA (Vdd=3.3V) **Q: Is this random access, i.e. send row/col position and character pairs? Or does it just scroll?** A: I am using it with a ESP32. To display I send row number,column position with lcd.setCursor(0,0); Rows are 0-3 and columns are 0-19. Does not scroll. **Q: Has anyone used these with a 3.3 volt device like a Raspberry Pi, ARM-based Arduino, or ESP32? How did you wire the backlight?** A: i used the sketch from printables on 3 an 5 volts to turn on and off back light i used a momentary button ## Customer Reviews ### ⭐⭐⭐⭐⭐ These work well. Read the review for how to make them better. *by H***E on June 19, 2025* These LCD screens are good. If you're familiar with the 4x16 which come with some of the Arduino kits, these are different in that they use I2C communication. This is a good thing as using I2C with the Arduino is easy and means these only need 4 wires to be connected: Vcc, GND, and two wires to enable the comms to the Arduino. Much easier than the ratsnest of wires to the 4x16 which come in some kits. Look up "hd44780.h library" and you will find it as a free download on GitHub. Of note, but certainly not worth dinging this any stars: at one time there was likely a jumper on two pins on the I2C backpack. (The little adapter card on the back which is the go-between for I2C to the LCD is called a "backpack"). The location for the two pins is still there but there are no pins and no jumper. If you check you will find that the two holes, soldered over, are connected. Looking closely, you will see a very fine trace between the two pin holes. If you scrape through that trace, electrically isolating those points, the LCD will not illuminate. Now check both pins to Vcc for continuity: you will find one solder pad/hole which is directly connected to Vcc. You don't want this pin/pad, you want the other one (make sure they are not connected any longer, be sure that you got the trace destroyed). Solder in a pin here or directly solder to it if you feel lucky and connect this to one of the PWM pins on the Arduino. You can now adjust the LCD backlighting brightness with the Arduino (you'll have to configure that Arduino pin and set its output appropriately). Without this modification the LCD is either on or off, which you can control with the Arduino. However, without this mod, you cannot adjust the brightness of the backlighting (the little trim pot on the back of the unit is for adjusting the contrast of the display). With this mod you can turn the backlight on and off like you could before, *AND* you can adjust the brightness of the backlight. At full power the backlight is *BRIGHT*. Turning it down indoors is...good. ### ⭐⭐⭐⭐⭐ Works as intended! *by T***S on April 19, 2026* Works amazing, good notation! ### ⭐⭐⭐⭐⭐ Perform well, great price *by B***E on March 19, 2025* These are used on enclosed, outdoor control systems. They perform as advertised, no problems with any of the units. Use standard Hitachi commands. You just can't beat the convenience with the controller attached. If you keep the backlight off, they only pull a couple of mAs. I pulled off the red LED on a couple but that only saves about 1.5 mA. I actually like the light so I can tell if the unit is getting power. The brightness is typical for these units. Have switched to 4 line commands because these are actually cheaper than the 2x16 I was using previously. So far, reliability has been good. Will continue buying. --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.tw/products/527594286-hosyond-3pcs-iic-i2c-2004-lcd-module-20x04-lcd-screen](https://www.desertcart.tw/products/527594286-hosyond-3pcs-iic-i2c-2004-lcd-module-20x04-lcd-screen) --- *Product available on Desertcart Taiwan* *Store origin: TW* *Last updated: 2026-05-20*