Agarwaal Electronics

This is Dot Led Matrix Module incorporating MAX7219 Driver chip. By using this dot LED module in your upcoming project,  you will be able to add some great cool animation. The individual module features 8×8 LED’s, each controlled very precisely by the MAX7219 driver to generate the colour pattern you wish. The great advantage of using this is users will have control over all of the 64 LED by just connecting 3 output communication wires to microcontrollers like Arduino etc.

The MAX7219 Dot Led Matrix Module is a serial input common-cathode driver that interfaces micro-controllers to LED matrices. All common micro-controllers can be connected to this module by using a 4-wire serial interface. Each output can be addressed without refreshing the entire display. This module requires only 3 I/O lines for driving the display, making it ideal for your microcontroller projects. Only one external register is used to set the segment current of each LED.

A 0.91 inch OLED display is a small, high-contrast, and energy-efficient display module commonly used in compact electronic devices. It features a 128x32 pixel resolution and typically utilizes an I2C interface for communication with microcontrollers. OLED technology provides bright, clear visuals with a wide viewing angle and low power consumption,making it suitable for applications like wearables and DIY projects. 

A 0.96 inch OLED display is a small, self-emissive display with a 128x64 pixel resolution, commonly used in various electronic devices and projects. It utilizes OLED (Organic Light-Emitting Diode) technology, which doesn't require a backlight, resulting in high contrast, wide viewing angles, and low power consumption. These displays are available with different color options (like blue, yellow, or blue/yellow) and can interface with microcontrollers via I2C or SPI. 

The wiring of this voltmeter is simple, only two wires need to be connected, the red wire is connected to the positive, and the black wire is connected to the negative. There is reverse connection protection in the meter, and the reverse connection does not burn. This voltmeter does not require an external working power supply, it can work directly with the measured voltage, and the working voltage range is as wide as 70-500V. In order to achieve the best measurement accuracy, the voltmeter will automatically move the position of the decimal point according to the difference of the measured voltage decimal point. This voltmeter can be used to monitor the battery voltage of motorcycles, automobiles, etc., and grasp the battery status in time. It can also be used for other voltage measurement purposes.

This is a high quality 16 character by 2 line intelligent display module, with back lighting, Works with almost any microcontroller.
This is a popular 16x2 lcd display. It is based on the hd44870 display controller hence it is easy to interface with most micro controllers. It works of 3.3v and has a green back light which can be switched on and off as desired. The contrast of the screen can also be controlled by varying the voltage at the contrast control pin (pin 3).

The MAX7219 does all the control and refresh work for you in driving either an 8x8 matrix display or 8 x 7-segment displays (usually these also have a dot so its really an 8-segment display) - 64 LEDs total. All you have to do is send it serial commands via the 4-pin SPI interface and it will auto-magically take care of the rest. Wiring is simplified as well, you only need to set the current level for all LEDs with a single resistor instead of 8 and you can also dim the entire display digitally. It's a thru-hole chip so you can use it in any breadboard, perfboard or other project, although if you're soldering it in, we suggest using a socket.