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Description
A one line 4 digit display using a MAX7219 display driver.
The MAX7219 mounted on the rear along with headers for a Wemos D1 Mini.
There are 16 LEDs mounted as a bar graph plus 4 more indicators.
Also mounted on the board is a speaker with transistor driver.
The speaker drive is at logic level and active high, ideal for alert tones.
A 4 pin headers is also provided for I2C connection, the pinout is the same as many popular sensor boards such as the UV sensor VEML6070.
Please note: This listing is for the LED board only no Wemos D1 is provided.
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Specification
● PCB Size: 78.7mm x 45.7mm x 26mm (if Wemos D1 fitted)
● Mounting Holes: 4off diameter 3mm Spacing 71.6mm x 38.6mm
● Weight (Without Wemos): 27g
● Current Draw: 260mA Max (all LEDs on)
● 7 Segment Display: Red 0.56"
● I2C: 4 Pin Connector, 3V3, GND, SCL and SDA
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Included
● PCB Assembled and Tested
● 4 Way Connector for I2C
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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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