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.
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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
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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
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Included
● PCB Assembled and Tested
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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.
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