70 lines
1.9 KiB
Markdown
70 lines
1.9 KiB
Markdown
# FTDI_simple_alarm
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Use a USB-Serial Converter like the FT232RL for activating a buzzer. Simple and cheap (~1,75€)
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## Features:
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* works on GNU/Linux only
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* no drivers or other software/libs are required
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* triggerd via bash or service daemon
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## Limitations:
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* works safe on system with only one `/dev/ttyUSB` device
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* no other task can use the FTDI device for other things
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## Hardware:
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1. FT232RL Breakout board ~1,5€
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2. NPN Transistor like 2N2222A ~0,0€
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3. Active Buzzer 5V ~0,25€
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### Schematics:
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### FTDI EEPROM
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To invert the TXD pin on the FTDI device, programming the EEPROM is needed. With the Windoofs tool "FTDI_Prog" the Template `ft232rl_alert.xml` is uplouded. For GNU/Linux is [ftx-prog](https://github.com/richardeoin/ftx-prog) available. The only difference to default is the inverted TXD pin.
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## Software:
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### Commmon Distributions
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Make sure the device is after plug in recognized as ttyUSB with `dmesg`.<br/>
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Edit the alert.sh with your device name, like `/dev/ttyUSB0`. <br/>
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Run `bash ./alert.sh` for starting the alarm.<br/>
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### openWrt
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`opkg update`<br/>
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`opkg install usbutils`<br/>
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`opkg install kmod-usb-serial`<br/>
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`opkg install kmod-usb-serial-ftdi`<br/>
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Make shure the device is recocntied as ttyUSB after plug in with `dmesg`.<br/>
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Edit the alarm.sh with your device name, like `/dev/ttyUSB0`. <br/>
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Run `bash ./alert.sh` for starting the alarm.<br/>
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### Service
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`nano /etc/init.d/alarm`
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```
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#!/bin/sh /etc/rc.common
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START=99
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restart() {
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bash /root/alert.sh > /dev/null 2>&1 &
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bash /root/alert.sh start > /dev/null 2>&1 &
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}
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start() {
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bash /root/alert.sh > /dev/null 2>&1 &
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bash /root/alert.sh start > /dev/null 2>&1 &
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}
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stop() {
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bash /root/alert.sh > /dev/null 2>&1 &
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}
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```
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`chmod +x /etc/init.d/alarm`
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`/etc/init.d/alarm start`
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`/etc/init.d/alarm stop` |