User Manual

VMA449
V. 01 – 12/02/2020 3 ©Velleman nv
4. What is Arduino
®
Arduino
®
is an open-source prototyping platform based in easy-to-use hardware and software.
Arduino
®
boards are able to read inputs – light-on sensor, a finger on a button or a Twitter
message – and turn it into an output – activating of a motor, turning on an LED, publishing
something online. You can tell your board what to do by sending a set of instructions to the
microcontroller on the board. To do so, you use the Arduino programming language (based on
Wiring) and the Arduino
®
software IDE (based on Processing).
Surf to www.arduino.cc and www.arduino.org for more information.
5. Overview
General
The VMA449 is a voice-recording module based on the ISD1820 chip, which is a multiple
message record/playback device. It offers single-chip voice recording, non-volatile storage, and
playback capability for 8 to 20 seconds.
The VMA449 can be controlled by the onboard push buttons or by a microcontroller such as
Arduino
®
.
Features
• Push-button interface, playback can be edge- or level-activated
• Automatic power down mode
• On-chip 8 Ω speaker driver
• Single 3 to 5 V power supply
• Can be controlled manually or by MCU
• Sample rate and duration can be changed by placing a resistor instead of jumper-cap P2
• Default recording time of 10 seconds
• Dimensions: 37 x 54 mm
Timing Table
Rosc (R4 + P2)
Duration
Sample rate
Bandwidth
80 kΩ
8 s
8.0 kHz
3.4 kHz
100 kΩ
10 s
6.4 kHz
2.6 kHz
120 kΩ
12 s
5.3 kHz
2.3 kHz
160 kΩ
16 s
4.0 kHz
1.7 kHz
200 kΩ
20 s
3.2 kHz
1.3 kHz