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G70 - Connect an External Buzzer/LED

The G70 can be set to sound buzzers based on various conditions such as:

  1. A trip starting, but no driver ID has been scanned - to remind drivers to tag on. This is configured on the Driver ID parameter tab, see G70 - Driver ID
  2. Digital Inputs being active/inactive. This is configured on the Digital Input parameter tab, see Digital Inputs Introduction - G70
  3. Harsh driving events. Configured on the Harsh Driving parameter tab, see
  4. Harsh Event Setup - G70
  5. Speeding events. The buzzer will sound when going over a certain speed. Configured on the Speeding tab, see 
  6. When speeding inside a geo-fence - Geofence Downloads Example: Buzz when over 40km/h inside geofence

To have a buzzer sound, we need to do 2 things:

  1. Correctly wire the buzzer, and configure the right parameters to tell the device we have a buzzer connected
  2. Configure one of the options above to set under what conditions we want buzzing to occur. 

What we will cover below is how to set up the output to behave correctly to make a buzzer beep (i.e. beep, beep, beep). This is achieved by having the device toggle an output on/off. If we connected an LED instead of a buzzer - the LED would flash. So this concept can be extended to anything we might want to behave in a pulsing on/off manner. 

Buzzer Options

  1. We can configure digital outputs on devices to sound an external buzzer which we wire in. 

When we set the device to 'buzz' i.e. buzz on no driver ID - all outputs we have configured to buzz will pulse.

Installation and Setup

Switched Ground as a Low Side Switch (preferred option)

The G70 has a switched ground output. See: G70 - Outputs - General for more detail. Switched Ground outputs can be thought of as a low side switch. They are high impedance (open circuit, no connection) when off, and provide a path to ground (i.e. close the loop) when on. 


  • Connect the high side of the buzzer to a constant power source - that is within the buzzers input voltage range. This could simply be to the vehicle battery, or to an ignition source (but then the buzzer is only provided with power when the ignition is on)
  • The low side of the buzzer to the switched ground output on the device. This is the Green Wire on the G70 harness.

In this configuration, the buzzer is constantly powered, but the switched ground output going on/off has the effect of connecting and disconnecting the negative terminal to ground.

When the negative terminal is connected to ground (SW GND output on) there is a complete circuit, and the buzzer sounds.  


Digital output

Add the Digital Output 1 tab and set the function to "Buzzer"

Graphical user interface, text, application

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 So now, if an event occurs that means the device will buzz (like over speed, or harsh braking) - the output line will pulse on, off, on, off, on, off... - to sound the buzzer. 

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