Instructions

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:
Voltage conversion ratio: 1/5
Input voltage range: 0-25 V DC
Output interface: analog voltage signal
Weight: 4 g
Dimensions (W x L x H): 30 x 25 x 13.8 mm
Wiring description
Pin
Name
Arduino® connection
VCC
Signal voltage input
-
GND
Ground
-
S
Signal voltage output
Analog pin 0 (A0)
+
Supply voltage
5V
-
Ground
GND