CMNB03-01
CMNB03-01 is a member of AI modules which has built in voice recording and play back function. It will playback a prerecorded message when a face is detected. It is good for interactive toys, gadgets and advertisement application.

Features

  • Small in size: 30×25mm, easy to install
  • No internet nor WIFI needs
  • Built in digital microphone for message recording
  • Built in audio amp for power speaker output
  • Playback message when face detect
  • Battery operation

Block diagram

Operation

1. There is a 3-postion slide switch for mode select
2. At off position, it will turn off power supply to module.
3. At play mode, when there is a face detect, it will play the prerecorded message. It works only face detect, no other object detection. It will resume detection after few second when message ended.
4. To record a message, slide switch to record, press REC button and speak to the module. Duration of message has been set at 30sec. (length of recording can be set on OEM base)
5. LED to indicate power status as well as motion detect

Board layout and connector

Connector
Function
J1
Power input
J2
NC (for internal test)
J3
NC (for internal test)
J5
KEY/LED/GND
J6
Speaker output
J7
DET/GND/BATT (Option)
S1
Slide switch REC/OFF/PLAY

Electrical characteristics

Parameter
Condition
Min
Max
Unit
Operation voltage
3.6
6.0
V
Operation current
Standby
90
mA
Playing audio (8 Ohm spk)
300
mA

Application Note

  1. 1.
    This module has been designed for face detect, therefore good image of face is important
    for successful detection. Below are some hints for playing.
    a. Detection distance is set at about 50cm to 100cm.
    b. Strong backlight or too dark environment is not good for detection.
    c. Always place module at the level of people’s head
    d. Sometimes it will happened false detect, that is a trade off.
    e. Power can be lithium battery or alkaline AAx4. Suggest to use DC5V for long time
    operation
  2. 2.
    Mode select can use on board slide switch or external switch by using J7. When use external
    switch, please use external DC power instead, no need power connected to J1.
  3. 3.
    For audio recording, external key switch is needed. Refer to the schematic as below. LED is an option for external output. This LED is in parallel to D2 on the module, which is to indicate face detected.

Board layout and dimension

Last modified 1yr ago