Build a simple alert that speaks or chimes when people come within range
Build a simple alert for when people get too close to keep their distance and wash their hands. As the ultrasonic sensor detects the person getting too close, it will use the record and playback module to playback a pre-recorded message. Use it to remind people to wash their hands or as an alert to keep them at a distance.
| Qty | Code | Description |
|---|---|---|
| 1 | XC4410 | UNO board |
| 1 | XC4605 | record and playback module |
| 1 | WC6028 | plug to socket jumper wires |
| 1 | PH9251 | battery snap 9V |
| 1 | XC4442 | ultrasonic sensor |
| 1 | AS3006 | speaker 1W round |
| 1 | SB2423 | 9V battery eclipse |
- XC4444 use a PIR sensor to detect movement instead, suitable for wider range doorways and rooms.
- XC3744 increase the volume and play louder messages.
- XC3748 use the MP3 audio player to play some tunes when people walk in.
- XC3714 use the 8 digit display to visualise the distance between the person and the device.
For instructions, check out https://jaycar.com.au/ultrasonic-voice-alert
Hook it up to power so it turns on, then hold the record button on the playback module so you can record a short message.
After recording the message, wave your hand infront of the ultrasonic sensor. you should find that when something passes the ultrasonic sensor, it will play back your message automatically.
| Problem | Possible cause |
|---|---|
| It keeps playing back the message | This could be caused by a few things:\ |
either the REPEAT switch is kept on, \ |
|
| or the ultrasonic sensor is not detecting correctly. \ | |
if changing the REPEAT switch doesn't fix it, have a \ |
|
| look at the Serial monitor for what the ultrasonic is doing | |
| It's not detecting movement | Definitely check the serial monitor |
