Hello pezi,
>> Which pins is the Secondary Serial IO interface on? Is it on the 14-Pin header or on the 6-Pin header?
most of the pins should be explained on the wikipage on the GitHub:
http://www.oelprinz.org/products/Blitzb ... _side.html
>>I don't understand which number in TS applies to the Blitzbox.
The arduino pin assignments are visible in the speeduino firmware. Go to the official firmware into init.cpp , the BlitzboxBL49sp is defined as "case42" and the pin definitions should start around line 2059:
case 42:
//Pin mappings for all BlitzboxBL49sp variants
pinInjector1 = 6; //Output pin injector 1
pinInjector2 = 7; //Output pin injector 2
pinInjector3 = 8; //Output pin injector 3
pinInjector4 = 9; //Output pin injector 4
pinCoil1 = 24; //Pin for coil 1
pinCoil2 = 25; //Pin for coil 2
pinCoil3 = 23; //Pin for coil 3
pinCoil4 = 22; //Pin for coil 4
pinTrigger = 19; //The CRANK Sensor pin
pinTrigger2 = 18; //The Cam Sensor pin
pinFlex = 20; // Flex sensor PLACEHOLDER value for now
pinTPS = A0; //TPS input pin
pinSpareTemp1 = A1; //LMM sensor pin
pinO2 = A2; //O2 Sensor pin
pinIAT = A3; //IAT sensor pin
pinCLT = A4; //CLT sensor pin
pinMAP = A7; //internal MAP sensor
pinBat = A6; //Battery reference voltage pin
pinBaro = A5; //external MAP/Baro sensor pin
pinO2_2 = A9; //O2 sensor pin (second sensor) PLACEHOLDER value for now
pinLaunch = 2; //Can be overwritten below
pinTachOut = 10; //Tacho output pin
pinIdle1 = 11; //Single wire idle control
pinIdle2 = 14; //2 wire idle control PLACEHOLDER value for now
pinFuelPump = 3; //Fuel pump output
pinVVT_1 = 15; //Default VVT output PLACEHOLDER value for now
pinBoost = 5; //Boost control
pinSpareLOut1 = 49; //enable Wideband Lambda Heater
pinSpareLOut2 = 16; //low current output spare2 PLACEHOLDER value for now
pinSpareLOut3 = 17; //low current output spare3 PLACEHOLDER value for now
pinSpareLOut4 = 21; //low current output spare4 PLACEHOLDER value for now
pinFan = 12; //Pin for the fan output
pinResetControl = 46; //Reset control output PLACEHOLDER value for now
break;
>> For example, I want to connect an oil pressure transmitter to the "MAF" pin.
"MassAirFlow" means "LuftMassenMesser" in german, so the abbreviation LMM is a bit unusual in international use...

This is pinSpareTemp1 = A1; //LMM sensor pin
>> I also want to use the "FAN" output for a display LED and the "HALL" as a VSS.
pinFan = 12; //Pin for the fan output
pinTrigger2 = 18; //The Cam Sensor pin
Be careful if you want to use the boost pin output, there was an error in the pin settings. Corrected firmware is available on
https://github.com/oelprinz-org/Blitzbo ... e/202402.1
until a new official firmware will be released.
Best regards,
Chris