Description

A one line 4 digit display using a MAX7219 display driver.  The MAX7219 mounted on the rear and a 10 pin 2.54mm header is used for connections.  There are 16 LED’s mounted as a bar graph plus 4 more indicators.

Also mounted on the board is a speaker with transistor driver.  The speaker input is at logic level and active high, ideal for alert tones.

Specification

● PCB Size: 78.7mm x 45.7mm x 19mm
● Mounting Holes: 4off diameter 3mm Spacing 71.6mm x 38.6mm
● Weight: 27g
● Current Draw: 260mA Max (all LEDs on)
● 7 Segment Display: Red 0.56"
● Connections: 10 Pin Connector pitch 2.54mm

Connections

⬄ Pin 1:   +5V Supply
⬄ Pin 2:   GND Supply
⬄ Pin 3:   MAX7219 Data In
⬄ Pin 4:   MAX7219 CS
⬄ Pin 5:   MAX7219 CLK
⬄ Pin 6:   MAX7219 Data Out
⬄ Pin 7:   Speaker Logic Level _∏_
⬄ Pin 8:   No Connection
⬄ Pin 9:   No Connection
⬄ Pin 10:  No Connection

Included

● PCB Assembled and Tested

Also Available

A simple panel mountable 3D printable bezel design is available on thingiverse.com, search for Dimwit-Dave. Also the schematic and Demo firmware is available on Github, search for mottramlabs.