Manual

3
Product overview
The Whadda bar graph module allows any microcontroller board to easily drive a 10-segment blue LED
bar graph. The module uses a TM1651 LED driver chip to drive the individual LED segments, which can
be controlled by using only 2 GPIO pins of a microcontroller (such as an Arduino® compatible board). It
should be noted that some of the LED-segments are wired together, resulting in 8 different controllable
states of the LED bar graph. This module is ideally suited to display levels of battery charge, water tanks,
etc…
Specifications:
Supply voltage: 3,3 – 5 V DC
Color: Blue
Driver chip: TM1651
Number of LED segments: 10
Number of level indicators: 8
Interface: 2 wire serial
Wiring description
Pin
Name
Arduino® connection
CLK
Serial clock
Digital pin (e.g. D3)
DIO
Serial data Input/Output
Digital pin (e.g. D2)
V
Supply voltage (5 V DC)
5V
G
Ground
GND