Ignition detection solution
Introduction
Ignition detection is a useful feature that we can implement into our connectivity solutions with some additional electrical components. In this article, we will show you two options on how to run the device depending on the state of Ignition:
- 1st option - the device turns on with the ignition and turns off when the ignition goes off.
- 2nd option - the device turns on with the ignition and stays on for some time, even if the ignition is turned off.
Schematics
The first schematic diagram provided gives you the ability to turn the device on and off depending on ignition state.
schematic.png
To build this schematic, you would need two electrical components:
- Diode
1N4001 diode or similar could be used. It is used to protect the control circuit from the sudden voltage spike. If the relay that you are using has a flyback diode built in, this diode is not needed. NOTE: if you are using this schematic without the diode, you risk damaging the device.
- Electromagnetic Relay
Relay choice depends on vehicle's electrical system voltage. If this setup is installed into a Vehicle with 12 V system, then a relay similar to the CM1-12V could be used. Otherwise, if the electrical system is 24 V, a relay similar to the CB1-P-24V could be used. When choosing a relay, the most important aspect is Coil Voltage, therefore I recommend using aforementioned relays based on the voltage.
The second schematic diagram provided gives you the ability to turn the device on with the ignition and turn off only when certain preset time expires after the ignition is turned off.
schematic.png
To build this schematic, you would need to use the electrical components as mentioned above, only in this case we will use 2 Relays and 2 Diodes. As mentioned earlier, using this schematic without the diode, raises risk damaging the device.
Device configuration
If you chose the first option, no additional device configuration is needed. If you would like a set up based on the second schematic, you would need to do additional configuring in the device. First of all, we need a custom startup script to toggle a second relay to ON position. Follow these steps to configure startup behavior:
- Navigate to System -> Custom scripts -> Startup script.
- Above the exit 0 text, input command to turn on the output Pin: ubus call ioman.gpio.dout1 update '{"value":"1"}'
