Link G4 Plus Software Tutorial: Digital Inputs
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Digital Inputs
02.13
| 00:00 | - Digital inputs differ from an analog voltage or analog temperature input as they are either on or off. |
| 00:06 | Normally these provide a switched input to the ECU. |
| 00:10 | Let's look at how we could set up a clutch switch. |
| 00:13 | If we access the ECU settings menu and click on digital inputs we can see a list of all the available digital inputs. |
| 00:20 | For this example we're going to set up a clutch switch on digital input four so we need to click on this. |
| 00:27 | If we double click on function, a list of available options will pop up. |
| 00:31 | In this case we have a pre configured option for clutch switch so we're going to select this. |
| 00:37 | Alternatively we could have used a general purpose input. |
| 00:40 | Firstly we need to select the type of switch that is connected to the input. |
| 00:45 | Our options here are toggle switch or momentary switch. |
| 00:49 | We're going to select toggle switch. |
| 00:52 | Next we need to turn the pull up resistor on or off. |
| 00:56 | The pull up resistor is used if we have a switch that connects to zero volts. |
| 01:00 | The pull up ensures that when the input is not connected to ground, the voltage will be high. |
| 01:05 | If the pull up was not turned on in this situation, the ECU would not be able to distinguish between on or off. |
| 01:12 | Our clutch switch is connected to zero volts so we need to turn the pull up on. |
| 01:15 | The on level defines if the digital input will be on when the input is at the high voltage or the low voltage. |
| 01:23 | Again this will depend on the switch input we're using. |
| 01:27 | In our case, the on level will be low as the switch connects to ground when the clutch is engaged. |
| 01:33 | Last we have the active edge. |
| 01:35 | Some digital inputs will switch when the input changes state. |
| 01:38 | Falling will switch when the signal goes from a 12 volts to zero volts. |
| 01:44 | Rising will switch when the signal goes from zero volts to 12 volts. |
| 01:48 | Here we will select falling edge as we want the input to turn on when the clutch is first engaged. |
| 01:55 | We can bring up our run time values display and click on the digital inputs tab to watch the clutch switch function. |
