knock input on microRusEFI
Posted: Fri Sep 25, 2020 9:16 pm
There is testing of knock on MRE going on.
The code is already in the master but there are some small hardware mods that are needed to me done so this function could be tested.
Step 1.
Remove input filter capacitor from AT4 channel. This is done by removing CN17 from the pcb. What i have done since it is a capacitor network, i moved it one position so pins 1 and 8 would overlay/connect to channel AT3, this way we can reuse the CN and the rest of the cannels are still working fine.
Next we need to create a small pcb to prepare the knock input. For this i used an opamp and some componentes next to it, it can be connected to the harness since we need the following connections: knock+ knock- 5v gnd and output that is connected to AT4.
The code is already in the master but there are some small hardware mods that are needed to me done so this function could be tested.
Step 1.
Remove input filter capacitor from AT4 channel. This is done by removing CN17 from the pcb. What i have done since it is a capacitor network, i moved it one position so pins 1 and 8 would overlay/connect to channel AT3, this way we can reuse the CN and the rest of the cannels are still working fine.
Next we need to create a small pcb to prepare the knock input. For this i used an opamp and some componentes next to it, it can be connected to the harness since we need the following connections: knock+ knock- 5v gnd and output that is connected to AT4.