5Pcs Max7219 8X8 Dot Matrix Led Display Module 5V Mcu Control Max7219 88 Led, B Product Details Description: MAX7219 is an integrated serial input / output common-cathode display drivers , which connects the microprocessor 7-segment digital LED display with 8 digits , bar graph can also be connected monitor or 64 separate LED. On type B BCD encoder includes an on-chip , multi-channel scanning loop , segment word drive, but also a 8x8 static RAM for storing each data . Only one external register is used to set the segment current for each LED. Wiring instructions: 1,Module on the left as an input port, output port on the right. 51 MCU, for example: VCC ? 5V Package list: 2 X MAX7219 dot matrix module Notice: Requires only three IO ports can drive a dot ! No flashing dot matrix display ! Support cascade ! 1.Module Operating voltage : 5V 2.Module size : 5 cm X 3.2 cm wide X 1.5 cm high 3.Single module can drive a common cathode 8 * 8 dot matrix 4.Holes with four screws , diameter 3mm, can be fixed by using our M3 studs 5.Modules with input and output interfaces , support for cascading multiple modules Payment We accept PayPal and credit cards via PayPal. Taxes - US We collect sales tax, as required by law. Shipping We make every effort of shipping within 3 business day of payment clearing. The estimated delivery time is 2 - 5 business days from the shipping date. Policies If you do need to return your item, please contact us via email (you will receive an email when your product ships with additional details - Subject: Important information about your purchase). You will then be provided with a return shipping label and packing slip. Pack the item carefully. Include the packing slip, apply the shipping label, and return the item within 30 business days of the date you request a return, or your return will be canceled. Once we receive your order we will inspect the return. Please allow up to 5 business days of receiving the returned item for your refund.