1. GENERAL INFORMATION
Dear Customer,
Thank you for choosing our product. In the following, we will show you
what to consider during commissioning and use.
Should you encounter any unexpected problems during use, please feel
free to contact us.
This sound module has a sound recorder and a playback device. It is
equipped with an ISD1820 chipset and has a recording time of about 8 to
20 seconds. It can be controlled via a built-in keypad and has a 0.5 watt
speaker and microphone.
2. CHANGING THE RECORDING TIME AND SAMPLING RATE
In this section we briefly explain the individual functions of the pins to
which you can connect your microcontroller or single board computer.
This is not a detailed explanation and only serves to explain the pins.
3. PIN ASSIGNMENT
VCC: 3.3V Power supply.
GND: Ground connection.
FT (Feed Through): Allows the
microphone to be output directly to
the speaker.
P-L (PLAYL): Playback, when the pin
changes from LOW to HIGH a
playback cycle is initiated.
P-E (PLAYE): Play endlessly, Plays the
recorded endlessly.
REC: Is active-HIGH and has priority
over the signals P-E and P-L. When
the pin is set HIGH, this activates the
recording.
To set the recording duration and sampling rate to a dierent value, it is
necessary to solder on a dierent resistor. The value of the resistor deter-
mines the duration of the recording and the sampling rate, which can va-
ry in the range from 8 to 20 seconds (with a sampling rate of 3-8 kHz). In
the following picture the resistor to be changed is marked. A table shows
you which resistors are required for which settings.
Widerstandswert Dauer Abtastrate Bandbreite
80K Ω 8 Sekunden 8.0KHz 3.4KHz
100K Ω 10 Sekunden 6.4KHz 2.6KHz
120K Ω 12 Sekunden 5.3KHz 2.3KHz
160K Ω 16 Sekunden 4.0KHz 1.7KHz
200K Ω 20 Sekunden 3.2KHz 1.3KHz
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